diff --git a/.gitmodules b/.gitmodules
index 346f5c0069..a2266c46af 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "deps/jemalloc"]
 	path = deps/jemalloc
 	url = https://github.com/jemalloc/jemalloc
+[submodule "deps/TSZ"]
+	path = deps/TSZ
+	url = https://github.com/taosdata/TSZ.git
diff --git a/cmake/input.inc b/cmake/input.inc
index 06a23ecb14..9d716e1e73 100755
--- a/cmake/input.inc
+++ b/cmake/input.inc
@@ -91,3 +91,12 @@ SET(TD_MEMORY_SANITIZER FALSE)
 IF (${MEMORY_SANITIZER} MATCHES "true")
   SET(TD_MEMORY_SANITIZER TRUE)
 ENDIF ()
+
+IF (${TSZ_ENABLED} MATCHES "true")
+  # define add 
+  MESSAGE(STATUS "build with TSZ enabled")
+  ADD_DEFINITIONS(-DTD_TSZ)
+  set(VAR_TSZ "TSZ" CACHE INTERNAL "global variant tsz" )
+ELSE()
+  set(VAR_TSZ "" CACHE INTERNAL "global variant empty" )
+ENDIF()  
diff --git a/deps/CMakeLists.txt b/deps/CMakeLists.txt
index eb22459d34..516c752bd1 100644
--- a/deps/CMakeLists.txt
+++ b/deps/CMakeLists.txt
@@ -15,7 +15,6 @@ ADD_SUBDIRECTORY(cJson)
 ADD_SUBDIRECTORY(wepoll)
 ADD_SUBDIRECTORY(MsvcLibX)
 ADD_SUBDIRECTORY(rmonotonic)
-
 ADD_SUBDIRECTORY(lua)
 
 IF (TD_LINUX AND TD_MQTT)
@@ -38,3 +37,7 @@ IF (TD_LINUX_64 AND JEMALLOC_ENABLED)
     BUILD_COMMAND       ${MAKE}
   )
 ENDIF ()
+
+IF (${TSZ_ENABLED} MATCHES "true")
+  ADD_SUBDIRECTORY(TSZ)  
+ENDIF()
\ No newline at end of file
diff --git a/deps/TSZ b/deps/TSZ
new file mode 160000
index 0000000000..0ca5b15a8e
--- /dev/null
+++ b/deps/TSZ
@@ -0,0 +1 @@
+Subproject commit 0ca5b15a8eac40327dd737be52c926fa5675712c
diff --git a/src/client/CMakeLists.txt b/src/client/CMakeLists.txt
index b84525dedb..2f83557d63 100644
--- a/src/client/CMakeLists.txt
+++ b/src/client/CMakeLists.txt
@@ -11,7 +11,7 @@ IF (TD_LINUX)
 
   # set the static lib name
   ADD_LIBRARY(taos_static STATIC ${SRC})
-  TARGET_LINK_LIBRARIES(taos_static common query trpc tutil pthread m rt)
+  TARGET_LINK_LIBRARIES(taos_static common query trpc tutil pthread m rt ${VAR_TSZ})
   SET_TARGET_PROPERTIES(taos_static PROPERTIES OUTPUT_NAME "taos_static")
   SET_TARGET_PROPERTIES(taos_static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
 
diff --git a/src/common/inc/tglobal.h b/src/common/inc/tglobal.h
index e35e805efe..30bbaaae73 100644
--- a/src/common/inc/tglobal.h
+++ b/src/common/inc/tglobal.h
@@ -205,6 +205,16 @@ extern int32_t wDebugFlag;
 extern int32_t cqDebugFlag;
 extern int32_t debugFlag;
 
+#ifdef TD_TSZ
+// lossy 
+extern char lossyColumns[];
+extern double fPrecision;
+extern double dPrecision;
+extern uint32_t maxIntervals;
+extern uint32_t intervals;
+extern char Compressor[];
+#endif
+
 typedef struct {
   char dir[TSDB_FILENAME_LEN];
   int  level;
diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index 913b0936db..d4c52c9d1f 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -244,6 +244,19 @@ int32_t tsdbDebugFlag = 131;
 int32_t cqDebugFlag = 131;
 int32_t fsDebugFlag = 135;
 
+#ifdef TD_TSZ
+//
+// lossy compress 6
+//
+char lossyColumns[32] = "";  // "float|double" means all float and double columns can be lossy compressed.  set empty can close lossy compress.
+// below option can take effect when tsLossyColumns not empty 
+double   fPrecision   = 1E-8;   // float column precision
+double   dPrecision   = 1E-16;  // double column precision
+uint32_t maxIntervals = 500;    // max intervals
+uint32_t intervals    = 100;    // intervals
+char     Compressor[32] = "ZSTD_COMPRESSOR"; // ZSTD_COMPRESSOR or GZIP_COMPRESSOR 
+#endif
+
 int32_t (*monStartSystemFp)() = NULL;
 void (*monStopSystemFp)() = NULL;
 void (*monExecuteSQLFp)(char *sql) = NULL;
@@ -1517,6 +1530,62 @@ static void doInitGlobalConfig(void) {
   cfg.ptrLength = tListLen(tsTempDir);
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
+
+#ifdef TD_TSZ
+  // lossy compress
+  cfg.option = "lossyColumns";
+  cfg.ptr = lossyColumns;
+  cfg.valType = TAOS_CFG_VTYPE_STRING;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
+  cfg.minValue = 0;
+  cfg.maxValue = 0;
+  cfg.ptrLength = tListLen(lossyColumns);
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
+  cfg.option = "fPrecision";
+  cfg.ptr = &fPrecision;
+  cfg.valType = TAOS_CFG_VTYPE_DOUBLE;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
+  cfg.minValue = MIN_FLOAT;
+  cfg.maxValue = MAX_FLOAT;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+
+  
+  taosInitConfigOption(cfg);
+
+  cfg.option = "dPrecision";
+  cfg.ptr = &dPrecision;
+  cfg.valType = TAOS_CFG_VTYPE_DOUBLE;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
+  cfg.minValue = MIN_FLOAT;
+  cfg.maxValue = MAX_FLOAT;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
+  cfg.option = "maxIntervals";
+  cfg.ptr = &maxIntervals;
+  cfg.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
+  cfg.minValue = 0;
+  cfg.maxValue = 65536;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
+  cfg.option = "intervals";
+  cfg.ptr = &intervals;
+  cfg.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
+  cfg.minValue = 0;
+  cfg.maxValue = 65536;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+#endif
+
 }
 
 void taosInitGlobalCfg() {
diff --git a/src/dnode/src/dnodeMain.c b/src/dnode/src/dnodeMain.c
index 7723b6221b..61244ac0fb 100644
--- a/src/dnode/src/dnodeMain.c
+++ b/src/dnode/src/dnodeMain.c
@@ -42,6 +42,7 @@
 #include "module.h"
 #include "qScript.h"
 #include "mnode.h"
+#include "tscompression.h"
 
 #if !defined(_MODULE) || !defined(_TD_LINUX)
 int32_t moduleStart() { return 0; }
@@ -236,6 +237,12 @@ static void dnodeCheckDataDirOpenned(char *dir) {
 }
 
 static int32_t dnodeInitStorage() {
+#ifdef TD_TSZ
+  // compress module init
+  tsCompressInit();
+#endif
+
+  // storage module init
   if (tsDiskCfgNum == 1 && dnodeCreateDir(tsDataDir) < 0) {
     dError("failed to create dir: %s, reason: %s", tsDataDir, strerror(errno));
     return -1;
@@ -311,7 +318,15 @@ static int32_t dnodeInitStorage() {
   return 0;
 }
 
-static void dnodeCleanupStorage() { tfsDestroy(); }
+static void dnodeCleanupStorage() {
+  // storage destroy
+  tfsDestroy(); 
+
+ #ifdef TD_TSZ 
+  // compress destroy
+  tsCompressExit();
+ #endif 
+}
 
 bool  dnodeIsFirstDeploy() {
   return strcmp(tsFirst, tsLocalEp) == 0;
diff --git a/src/kit/CMakeLists.txt b/src/kit/CMakeLists.txt
index 7053052007..fdf58d5ae1 100644
--- a/src/kit/CMakeLists.txt
+++ b/src/kit/CMakeLists.txt
@@ -4,3 +4,4 @@ PROJECT(TDengine)
 ADD_SUBDIRECTORY(shell)
 ADD_SUBDIRECTORY(taosdemo)
 ADD_SUBDIRECTORY(taosdump)
+ADD_SUBDIRECTORY(taospack)
diff --git a/src/kit/taospack/CMakeLists.txt b/src/kit/taospack/CMakeLists.txt
new file mode 100644
index 0000000000..58c3688732
--- /dev/null
+++ b/src/kit/taospack/CMakeLists.txt
@@ -0,0 +1,21 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+PROJECT(TDengine)
+
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/util/inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/os/inc)
+INCLUDE_DIRECTORIES(inc)
+
+IF (TD_LINUX)
+  AUX_SOURCE_DIRECTORY(. SRC)
+  ADD_EXECUTABLE(taospack ${SRC})
+  TARGET_LINK_LIBRARIES(taospack os tutil tsdb ${VAR_TSZ})
+ELSEIF (TD_WINDOWS)
+  AUX_SOURCE_DIRECTORY(. SRC)
+  ADD_EXECUTABLE(taospack ${SRC})
+  TARGET_LINK_LIBRARIES(taospack)
+ELSEIF (TD_DARWIN)
+  # MAC
+  AUX_SOURCE_DIRECTORY(. SRC)
+  ADD_EXECUTABLE(taospack ${SRC})
+  TARGET_LINK_LIBRARIES(taospack os tutil tsdb)
+ENDIF ()
\ No newline at end of file
diff --git a/src/kit/taospack/taospack.c b/src/kit/taospack/taospack.c
new file mode 100644
index 0000000000..33d779dfcf
--- /dev/null
+++ b/src/kit/taospack/taospack.c
@@ -0,0 +1,766 @@
+
+
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(WINDOWS) 
+int main(int argc, char *argv[]) {
+  printf("welcome to use taospack tools v1.3 for windows.\n");
+}
+#elif !defined(TD_TSZ) 
+int main(int argc, char *argv[]) {
+  printf(" welcome taospack. \n You not open TSZ , please define TD_TSZ to open TSZ algo.\n");
+}
+#else
+
+#include "os.h"
+#include "tscompression.h"
+#include "tdataformat.h"
+
+
+
+// ------- define -----------
+#define FT_CNT  8
+
+// ------- function declare --------
+void cost_start();
+double cost_end(const char* tag);
+int notsame_cnt  = 0;
+
+// ------- global declare -----------
+float g_ft1[ ] = {\
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+  ,3.8949999809265137, 3.8970000743865967, 3.8980000019073486, 3.8980000019073486, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8940000534057617, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8940000534057617, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8929998874664307, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8929998874664307, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8980000019073486, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.9000000953674316, 3.8940000534057617, 3.8929998874664307, 3.8929998874664307, 3.8929998874664307, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8980000019073486, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307\
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+  };
+
+double g_de1[ ] = {\
+  3.895999908447265612345, 3.897000074386596701234, 3.89800000190734860123456789, 3.8980000019073486, 3.8970000743865967, 3.8970000743865967, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8980000019073486, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8980000019073486, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8980000019073486, 3.8949999809265137, 3.8980000019073486, 3.8970000743865967, 3.8970000743865967, 3.8970000743865967, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8980000019073486, 3.8949999809265137, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8980000019073486, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8980000019073486, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8980000019073486, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8980000019073486, 3.8949999809265137, 3.8959999084472656, 3.8980000019073486, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8949999809265137, 3.8940000534057617, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8980000019073486, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8980000019073486, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8989999294281006, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8940000534057617, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8929998874664307, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.9010000228881836, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8970000743865967, 3.8980000019073486, 3.8970000743865967, 3.8989999294281006, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617\
+  ,3.8949999809265137, 3.8970000743865967, 3.8980000019073486, 3.8980000019073486, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8970000743865967, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8940000534057617, 3.8970000743865967, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8970000743865967, 3.8940000534057617, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8929998874664307, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8970000743865967, 3.8959999084472656, 3.8970000743865967, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.8970000743865967, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8929998874664307, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8949999809265137, 3.8980000019073486, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307, 3.8940000534057617, 3.8949999809265137, 3.8940000534057617, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8940000534057617, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8940000534057617, 3.8949999809265137, 3.9000000953674316, 3.8940000534057617, 3.8929998874664307, 3.8929998874664307, 3.8929998874664307, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8959999084472656, 3.8980000019073486, 3.8949999809265137, 3.8949999809265137, 3.8949999809265137, 3.8940000534057617, 3.8929998874664307\
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+  };
+
+/*
+struct timeval startTime;
+struct timeval endTime; 
+struct timeval costStart; 
+double totalCost = 0;
+
+void cost_start()
+{
+	  totalCost = 0;
+    gettimeofday(&costStart, NULL);
+}
+
+double cost_end(const char* tag)
+{
+    double elapsed;
+    struct timeval costEnd;
+    gettimeofday(&costEnd, NULL);
+    elapsed = ((costEnd.tv_sec*1000000+costEnd.tv_usec)-(costStart.tv_sec*1000000+costStart.tv_usec))/1000000.0;
+    totalCost += elapsed;
+    double use_ms = totalCost*1000;
+    printf(" timecost %s : %.3f ms\n", tag, use_ms);
+    return use_ms; 
+}
+*/
+
+float toFloat(char* buf){
+  return (float)atoll(buf);
+}
+
+//
+//  read float 
+//
+float* read_float(const char* inFile, int* pcount){
+  // check valid
+  if(inFile == NULL || inFile[0] == 0 ){
+    printf(" inFile  is NULL or EMPTY.\n");
+    return NULL;
+  }
+
+  // read in file
+  FILE* pfin =  fopen(inFile, "r");
+  if(pfin == NULL){
+    printf(" open IN file %s error. errno=%d\n", inFile, errno);
+    return false;
+  }
+
+  // read one line from infile and write to outfile
+  char buf[256]={0};
+  int  malloc_cnt = 100000;
+  float* floats = malloc(malloc_cnt*sizeof(float));
+  int  fi = 0;
+  while(fgets(buf, sizeof(buf), pfin) != NULL) {
+    // get item
+    if(buf[0] == 0 || strcmp(buf, " ") == 0)
+        continue;
+    floats[fi] = atof(buf);
+    //printf(" buff=%s float=%.50f \n ", buf, floats[fi]);
+    if ( ++fi == malloc_cnt ) {
+      malloc_cnt += 100000;
+      floats = realloc(floats, malloc_cnt*sizeof(float));
+    }
+    memset(buf, 0, sizeof(buf));
+  }
+
+  // close
+  fclose(pfin);
+  if(pcount)
+    *pcount = fi;
+  return floats;
+}
+
+float check_same(float* ft1, float* ft2, int count){
+  int same_cnt =0;
+  for(int i=0; i< count; i++){
+    
+    if(ft1[i] == ft2[i]){
+       same_cnt ++;
+    }
+
+    if(i < 5){
+      printf(" i=%d ft1=%.40f diff=%.40f \n", i, ft1[i], ft1[i] - ft2[i]);
+      printf(" i=%d ft2=%.40f \n", i, ft2[i]);
+    }
+      
+  }
+  float same_rate = same_cnt*100/count;
+  printf(" all count=%d same=%d same rate=%.0f%% \n", count, same_cnt, same_rate);
+  return same_rate;
+}
+
+double check_same_double(double* ft1, double* ft2, int count){
+  int same_cnt =0;
+  for(int i=0; i< count; i++){
+    
+    if(ft1[i] == ft2[i]){
+       same_cnt ++;
+    }
+
+    if(i < 5){
+      printf(" i=%d ft1=%.40f diff=%.40f \n", i, ft1[i], ft1[i] - ft2[i]);
+      printf(" i=%d ft2=%.40f \n", i, ft2[i]);
+    }
+      
+  }
+  double same_rate = same_cnt*100/count;
+  printf(" all count=%d same=%d same rate=%.0f%% \n", count, same_cnt, same_rate);
+  return same_rate;
+}
+
+//
+// test compress and decompress
+//
+
+bool DoDouble(double* doubles, int cnt, int algorithm) {
+  // compress
+  const char* input = (const char*)doubles;
+  int input_len = cnt * sizeof(double);
+  char* output = (char*) malloc(input_len);
+  int output_len = input_len;
+  char* buff = (char*) malloc(input_len);
+  int buff_len = input_len;
+
+  cost_start();
+  int ret_len = 0;
+  if(algorithm == 2) 
+     ret_len = tsCompressDouble(input, input_len, cnt, output, output_len, algorithm, buff, buff_len);
+  else
+     ret_len = tsCompressDoubleLossy(input, input_len, cnt, output, output_len, algorithm, buff, buff_len);
+
+  if(ret_len == -1) {
+    printf(" compress error.\n");
+    return 0;
+  }
+  double use_ms1 = cost_end("compress");
+
+  printf(" compress len=%d input len=%d\n", ret_len, input_len);
+  double rate=100*(double)ret_len/(double)input_len;
+  printf(" compress rate=%.1f an-rate=%.4f%%\n", (double)input_len/(double)ret_len, rate);
+  
+  //   
+  // decompress
+  //
+  double* ft2 = (double*)malloc(input_len); 
+  cost_start();
+  int code = 0;
+
+  if(algorithm == 2) 
+     code = tsDecompressDouble(output, ret_len, cnt, (char*)ft2, input_len, algorithm, buff, buff_len);
+  else
+     code = tsDecompressDoubleLossy(output, ret_len, cnt, (char*)ft2, input_len, algorithm, buff, buff_len);
+   
+
+  double use_ms2 = cost_end("Decompress");
+  printf(" Decompress return length=%d \n", code);
+
+  // compare same
+  double same_rate = check_same_double(doubles, ft2, cnt);
+
+  printf("\n ------------------  count:%d  <%s> ---------------- \n", cnt, algorithm == 2?"TD":"SZ");
+  printf("    Compress Rate ......... [%.2f%%] \n", rate);
+  double speed1 = (cnt*sizeof(double)*1000/1024/1024)/use_ms1;
+  printf("    Compress Time ......... [%.4fms] speed=%.1f MB/s\n", use_ms1, speed1);
+  double speed2 = (cnt*sizeof(double)*1000/1024/1024)/use_ms2;
+  printf("    Decompress Time........ [%.4fms] speed=%.1f MB/s\n", use_ms2, speed2);
+  printf("    Same Rate ............. [%.0f%%] \n\n", same_rate);
+
+
+  // free
+  free(ft2);
+  free(buff);
+  free(output); 
+
+  return true;
+}
+
+bool DoFloat(float* floats, int cnt, int algorithm, bool lossy) {
+  // compress
+  const char* input = (const char*)floats;
+  int input_len = cnt * sizeof(float);
+  char* output = (char*) malloc(input_len);
+  int output_len = input_len;
+  char* buff = (char*) malloc(input_len);
+  int buff_len = input_len;
+
+  cost_start();
+  int ret_len = 0;
+  ret_len = tsCompressFloat(input, input_len, cnt, output, output_len, algorithm, buff, buff_len);
+ 
+  if(ret_len == -1) {
+    printf(" compress error.\n");
+    return 0;
+  }
+  double use_ms1 = cost_end("compress");
+
+  printf(" compress len=%d input len=%d\n", ret_len, input_len);
+  float rate=100*(float)ret_len/(float)input_len;
+  printf(" compress rate=%.1f an-rate=%.4f%%\n", (float)input_len/(float)ret_len, rate);
+  
+  //   
+  // decompress
+  //
+  float* ft2 = (float*)malloc(input_len); 
+  cost_start();
+  int code = 0;
+  code = tsDecompressFloat(output, ret_len, cnt, (char*)ft2, input_len, algorithm, buff, buff_len);
+  
+  double use_ms2 = cost_end("Decompress");
+  printf(" Decompress return length=%d \n", code);
+
+  // compare same
+  float same_rate = check_same(floats, ft2, cnt);
+
+  printf("\n ------------------  count:%d  <%s> ---------------- \n", cnt, lossy?"SZ":"TD");
+  printf("    Compress Rate ......... [%.2f%%] \n", rate);
+  double speed1 = (cnt*sizeof(float)*1000/1024/1024)/use_ms1;
+  printf("    Compress Time ......... [%.4fms] speed=%.1f MB/s\n", use_ms1, speed1);
+  double speed2 = (cnt*sizeof(float)*1000/1024/1024)/use_ms2;
+  printf("    Decompress Time........ [%.4fms] speed=%.1f MB/s\n", use_ms2, speed2);
+  printf("    Same Rate ............. [%.0f%%] \n\n", same_rate);
+
+
+  // free
+  free(ft2);
+  free(buff);
+  free(output); 
+
+  return true;
+}
+
+
+bool testFile(const char* inFile, char algorithm, bool lossy){
+  // check valid
+  if(inFile == NULL || inFile[0] == 0 ){
+    printf(" inFile is NULL or EMPTY.\n");
+    return false;
+  }
+
+  int cnt = 0;
+  float* floats = read_float(inFile, &cnt);
+  if(floats == NULL) {
+    return false;
+  }
+
+  DoFloat(floats, cnt, algorithm, lossy);
+
+  free(floats);
+  return true;
+}
+//
+//  txt to binary file
+//
+#define BUFF_CNT 256
+bool txt_to_bin(const char* inFile, const char* outFile){
+  // check valid
+  if(inFile == NULL || outFile == NULL || inFile[0] == 0 || outFile[0] == 0){
+    printf(" inFile or outFile is NULL or EMPTY.\n");
+    return false;
+  }
+
+  printf(" infile=%s \n",  inFile);
+  printf(" outfile=%s \n", outFile);
+
+  // read in file
+  FILE* pfin =  fopen(inFile, "r");
+  if(pfin == NULL){
+    printf(" open IN file %s error. errno=%d\n", inFile, errno);
+    return false;
+  }
+
+  // create out file
+  FILE* pfout = fopen(outFile, "w+");
+  if(pfout == NULL){
+    printf(" open OUT file %s error. errno=%d\n", outFile, errno);
+    fclose(pfin);
+    return false;
+  }
+
+  // read one line from infile and write to outfile
+  char buf[256]={0};
+  float fbuf[BUFF_CNT] = {0};
+  int   fi = 0;
+  int   count = 0;
+  while(fgets(buf, sizeof(buf), pfin) != NULL) {
+    // get item
+    fbuf[fi] = toFloat(buf);
+    if ( ++fi == BUFF_CNT ) {
+      // write
+      if(fwrite(fbuf, sizeof(float), BUFF_CNT, pfout) == 0) {
+        printf(" write to file %s error , code=%d . app exit.\n", outFile, errno);
+        exit(1);
+      }
+      fi = 0;
+    }
+    count ++;
+    memset(buf, 0, sizeof(buf));
+  }
+
+  // write retain
+  if( fi > 0){
+    if(fwrite(fbuf, sizeof(float), fi, pfout) == 0) {
+      printf(" write to file %s error , code=%d . app exit.\n", outFile, errno);
+      exit(1);
+    }
+  }
+
+  // close
+  fclose(pfin);
+  fclose(pfout);
+
+  // total
+  printf(" count=%d  write bytes=%d \n", count, (int)(count*sizeof(float)));
+  return true;
+}
+
+
+int memTestDouble() {
+  // douelbe
+  const char* input = (const char*) g_de1;
+  double* de1 = g_de1;
+  int input_len = sizeof(g_de1);
+  int cnt = input_len/sizeof(double);
+  printf(" input input_len=%d count=%d \n", input_len, cnt);
+
+  char* output = (char*) malloc(input_len);
+  int output_len = input_len;
+
+  char buff[1024] ={0};
+  int buff_len = sizeof(buff);
+
+  cost_start();
+  int ret_len = tsCompressDoubleLossy(input, input_len, cnt, output, output_len, ONE_STAGE_COMP, buff, buff_len);
+  if(ret_len == -1) {
+    printf(" compress error.\n");
+    return 0;
+  }
+  cost_end(" tscompress");
+
+  printf(" compress return len=%d input len=%d\n", ret_len, input_len);
+  printf(" compress rate=%.1f an-rate=%.0f%%\n", (float)input_len/(float)ret_len, 100*(float)ret_len/(float)input_len);
+  
+  //   
+  // decompress
+  //
+  double* de2 = (double*)malloc(input_len); 
+  cost_start();
+  int code = tsDecompressDoubleLossy(output, ret_len, cnt, (char*)de2, input_len, ONE_STAGE_COMP, buff, buff_len);
+  cost_end("tsde-compress double");
+  printf(" de-compress return code=%d \n", code);
+
+
+  //
+  // show
+  //
+  int  same_cnt = 0;
+  int  diffshow_cnt = 0;
+  for(int i=0; i< cnt; i++){
+
+    if(i < 10)
+      printf(" i=%d de1=%.20f de2=%.20f  same=%d\n", i, de1[i], de2[i], de1[i] == de2[i]);
+
+    if(de1[i] == de2[i])
+        same_cnt ++;
+    else {
+      notsame_cnt++;
+      if(i >= 10 && ++diffshow_cnt < 50){
+         printf(" i=%d de1=%.20f de2=%.20f  diff\n", i, de1[i], de2[i]);
+      }
+    }
+  }
+   
+  printf(" ---- result doulbe : same =%d cnt=%d  rate:%d%% global not same=%d---- \n", same_cnt, cnt, same_cnt*100/cnt, notsame_cnt);
+   
+  free(output); 
+  free(de2);
+  return 1;
+}
+
+
+
+
+int memTest() {
+  
+  //
+  //float ft1[] = {1.2, 2.4, 3.33, 4.444, 5.555, 6.6666, 7.7777, 8.88888,1.2, 2.4, 3.33, 4.444, 5.555, 6.6666, 7.7777, 8.88888,1.2, 2.4, 3.33, 4.444, 5.555, 6.6666, 7.7777, 8.88888};
+  //
+
+  float* ft1 = g_ft1;
+  const char* input = (const char*) ft1;
+  int input_len = sizeof(g_ft1);
+  int cnt = input_len/sizeof(float);
+  printf(" input input_len=%d count=%d \n", input_len, cnt);
+
+  
+  char* output = (char*) malloc(input_len);
+  int output_len = input_len;
+
+  char buff[1024] ={0};
+  int buff_len = sizeof(buff);
+
+  cost_start();
+  int ret_len = tsCompressFloatLossy(input, input_len, cnt, output, output_len, ONE_STAGE_COMP, buff, buff_len);
+  if(ret_len == -1) {
+    printf(" compress error.\n");
+    return 0;
+  }
+  cost_end(" tscompress");
+
+  printf(" compress return len=%d input len=%d\n", ret_len, input_len);
+  printf(" compress sz rate=%.1f an-rate=%.2f%%\n", (float)input_len/(float)ret_len, 100*(float)ret_len/(float)input_len);
+  
+  //   
+  // decompress
+  //
+  float* ft2 = (float*)malloc(input_len); 
+  cost_start();
+  int code = tsDecompressFloatLossy(output, ret_len, cnt, (char*)ft2, input_len, ONE_STAGE_COMP, buff, buff_len);
+  cost_end("tsde-compress");
+  printf(" de-compress return code=%d \n", code);
+
+
+  //
+  // show
+  //
+  int  same_cnt = 0;
+  int  diffshow_cnt = 0;
+  for(int i=0; i< cnt; i++){
+
+    if(i < 10)
+      printf(" i=%d ft1=%.20f ft2=%.20f  same=%d\n", i, ft1[i], ft2[i], ft1[i] == ft2[i]);
+
+    if(ft1[i] == ft2[i])
+        same_cnt ++;
+    else {
+      notsame_cnt++;
+      if(i >= 10 && ++diffshow_cnt < 50){
+         printf(" i=%d ft1=%.20f ft2=%.20f  diff\n", i, ft1[i], ft2[i]);
+      }
+    }
+  }
+   
+  printf(" ---- result : same =%d cnt=%d  rate:%d%% global not same=%d---- \n", same_cnt, cnt, same_cnt*100/cnt, notsame_cnt);
+   
+  free(output); 
+  free(ft2);
+  return 1;
+}
+
+void* memTestThread(void* lparam) {
+  //memTest();
+  printf(" enter thread ....\n");
+  for(int i=0; i<1; i++)
+  {
+      memTest();
+      printf(" start i=%d .... \n", i);
+  }
+  return NULL;
+}
+
+void test_threadsafe(int thread_count){
+  printf(" test thread safe . thread count=%d \n", thread_count);
+  pthread_t handle[1000000];
+  int i=0;
+  for(i=0; i< thread_count; i++){
+    printf("  create thread %d... \n", i);
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_create(&handle[i], &attr, memTestThread, NULL);
+    pthread_attr_destroy(&attr);
+  }
+
+  for(i=0; i< thread_count; i++)
+  {
+    pthread_join(handle[i], NULL);
+  }
+  
+  printf(" test thread safe end. not same count=%d\n", notsame_cnt);
+  
+}
+
+
+void* memTestThreadDouble(void* lparam) {
+  //memTest();
+  printf(" enter thread ....\n");
+  for(int i=0; i< 1; i++)
+  {
+      memTest();
+      printf(" double start i=%d .... \n", i);
+  }
+  return NULL;
+}
+
+void test_threadsafe_double(int thread_count){
+  printf(" test thread safe . thread count=%d \n", thread_count);
+  pthread_t handle[1000000];
+  int i=0;
+  for(i=0; i< thread_count; i++){
+    printf("  create thread %d... \n", i);
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_create(&handle[i], &attr, memTestThreadDouble, NULL);
+    pthread_attr_destroy(&attr);
+  }
+
+  for(i=0; i< thread_count; i++)
+  {
+    pthread_join(handle[i], NULL);
+  }
+  
+  printf("\n  ---- double test thread safe end. not same count=%d-----\n", notsame_cnt);
+  
+}
+
+
+void unitTestFloat() {
+
+  float ft1 [] = {1.11, 2.22, 3.333};
+  int cnt = sizeof(ft1)/sizeof(float);
+  float* floats = ft1;
+  int algorithm = 2;
+
+  // compress
+  const char* input = (const char*)floats;
+  int input_len = cnt * sizeof(float);
+  int output_len = input_len + 1024;
+  char* output = (char*) malloc(output_len);
+  char* buff = (char*) malloc(input_len);
+  int buff_len = input_len;
+
+  printf(" ft1 have count=%d \n", cnt);
+  strcpy(output, "abcde");
+
+  cost_start();
+  int ret_len = 0;
+  ret_len = tsCompressFloatLossy(input, input_len, cnt, output, output_len, algorithm, buff, buff_len);
+
+  if(ret_len == 0) {
+    printf(" compress error.\n");
+    return ;
+  }
+  double use_ms1 = cost_end("compress");
+
+  printf(" compress len=%d input len=%d\n", ret_len, input_len);
+  float rate=100*(float)ret_len/(float)input_len;
+  printf(" compress rate=%.1f an-rate=%.4f%%\n", (float)input_len/(float)ret_len, rate);
+  
+  //   
+  // decompress
+  //
+  float* ft2 = (float*)malloc(input_len); 
+  cost_start();
+  int code = 0;
+  code = tsDecompressFloatLossy(output, ret_len, cnt, (char*)ft2, input_len, algorithm, buff, buff_len);
+   
+
+  double use_ms2 = cost_end("Decompress");
+  printf(" Decompress return length=%d \n", code);
+
+  // compare same
+  float same_rate = check_same(floats, ft2, cnt);
+
+  printf("\n ------------------  count:%d TD <SZ> ---------------- \n", cnt);
+  printf("    Compress Rate ......... [%.0f%%] \n", rate);
+  double speed1 = (cnt*sizeof(float)*1000/1024/1024)/use_ms1;
+  printf("    Compress Time ......... [%.4fms] speed=%.1f MB/s\n", use_ms1, speed1);
+  double speed2 = (cnt*sizeof(float)*1000/1024/1024)/use_ms2;
+  printf("    Decompress Time........ [%.4fms] speed=%.1f MB/s\n", use_ms2, speed2);
+  printf("    Same Rate ............. [%.0f%%] \n\n", same_rate);
+
+
+  // free
+  free(ft2);
+  free(buff);
+  free(output); 
+ 
+}
+
+#define DB_CNT 500
+void test_same_double(int algo){
+  double ori =  3.1415926;
+
+  double doubles [DB_CNT];
+  for(int i=0; i< DB_CNT; i++){
+    doubles[i] = ori;
+  } 
+
+  DoDouble(doubles, DB_CNT, algo);
+
+}
+
+#ifdef TD_TSZ
+extern char lossyColumns [];
+extern bool lossyDouble;
+extern bool lossyFloat;
+extern double  fPrecision;
+extern char Compressor [];
+#endif
+//
+//   -----------------  main ----------------------
+//
+int main(int argc, char *argv[]) {
+  printf("welcome to use taospack tools v1.3\n");
+
+  //printf(" sizeof(int)=%d\n",  (int)sizeof(int));
+  //printf(" sizeof(long)=%d\n", (int)sizeof(long));
+  //printf(" sizeof(short)=%d\n",(int)sizeof(short));
+  
+ 
+  strcpy(lossyColumns, "float|double");
+  bool lossy = true;
+  //fPrecision = 1E-5;
+  //strcpy(Compressor, "GZIP_COMPRESSOR");
+
+  tsCompressInit();
+  lossyFloat = lossyDouble = true;
+
+  printf(" fPrecision=%.15f\n",fPrecision);
+
+ 
+  //
+  //tsCompressExit();
+  //return 1; 
+  //printf(" SZ_SIZE_TYPE=%d", )
+
+  if(argc == 3){
+    char algo = 0;
+    // t
+    if(strcmp(argv[1], "-tone") == 0 || strcmp(argv[1], "-t") == 0 ) {
+        algo = ONE_STAGE_COMP;
+        lossyFloat = lossyDouble = true;
+    }
+    if(strcmp(argv[1], "-tw") == 0) {
+        algo = TWO_STAGE_COMP;
+        lossy = false;
+        lossyFloat = lossyDouble = false;
+    }
+
+    if(strcmp(argv[1], "-sf") == 0) {
+        test_threadsafe(atoi(argv[2]));
+        return 0;
+    }
+
+    if(strcmp(argv[1], "-sd") == 0) {
+        test_threadsafe_double(atoi(argv[2]));
+        return 0;
+    }
+
+   if(strcmp(argv[1], "-samed") == 0) {
+        test_same_double(atoi(argv[2]));
+        return 0;
+    }
+ 
+    if(algo == 0){
+      printf(" no param -tone -tw \n");
+      return 0;
+    }
+     
+    bool ret = testFile(argv[2], algo, lossy);
+    printf(" test file %s. \n", ret ? "ok" : "err");
+    return 1;
+
+  } else if( argc == 2) {
+    if(strcmp(argv[1], "-mem") == 0) {
+      memTest();
+    } 
+  }
+  else{
+    unitTestFloat();
+  }
+
+  tsCompressExit();
+  return 0;
+}
+
+#endif
+
diff --git a/src/util/CMakeLists.txt b/src/util/CMakeLists.txt
index 44808b1025..ef304d2fcb 100644
--- a/src/util/CMakeLists.txt
+++ b/src/util/CMakeLists.txt
@@ -4,10 +4,14 @@ PROJECT(TDengine)
 INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/rpc/inc)
 INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/sync/inc)
 INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/rmonotonic/inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/TSZ/sz/include)
 
 AUX_SOURCE_DIRECTORY(src SRC)
 ADD_LIBRARY(tutil ${SRC})
-TARGET_LINK_LIBRARIES(tutil pthread os lz4 z rmonotonic)
+
+TARGET_LINK_LIBRARIES(tutil pthread os lz4 z rmonotonic ${VAR_TSZ} )
+
+
 
 IF (TD_LINUX)
   TARGET_LINK_LIBRARIES(tutil m rt)
@@ -37,4 +41,4 @@ ENDIF()
 
 IF (TD_STORAGE)
   TARGET_LINK_LIBRARIES(tutil storage)
-ENDIF ()
\ No newline at end of file
+ENDIF ()
diff --git a/src/util/inc/tconfig.h b/src/util/inc/tconfig.h
index fdb2595fd8..d03ce6e0f1 100644
--- a/src/util/inc/tconfig.h
+++ b/src/util/inc/tconfig.h
@@ -20,7 +20,7 @@
 extern "C" {
 #endif
 
-#define TSDB_CFG_MAX_NUM    110
+#define TSDB_CFG_MAX_NUM    116  // 110 + 6 with lossy option
 #define TSDB_CFG_PRINT_LEN  23
 #define TSDB_CFG_OPTION_LEN 24
 #define TSDB_CFG_VALUE_LEN  41
@@ -32,6 +32,9 @@ extern "C" {
 #define TSDB_CFG_CTYPE_B_OPTION    16U  // can be configured by taos_options function
 #define TSDB_CFG_CTYPE_B_NOT_PRINT 32U  // such as password
 
+#define MAX_FLOAT    100000
+#define MIN_FLOAT    0
+
 enum {
   TAOS_CFG_CSTATUS_NONE,     // not configured
   TAOS_CFG_CSTATUS_DEFAULT,  // use system default value
@@ -50,6 +53,7 @@ enum {
   TAOS_CFG_VTYPE_IPSTR,
   TAOS_CFG_VTYPE_DIRECTORY,
   TAOS_CFG_VTYPE_DATA_DIRCTORY,
+  TAOS_CFG_VTYPE_DOUBLE,
 };
 
 enum {
diff --git a/src/util/inc/tscompression.h b/src/util/inc/tscompression.h
index cca6d6e250..3f2160bbf2 100644
--- a/src/util/inc/tscompression.h
+++ b/src/util/inc/tscompression.h
@@ -34,6 +34,22 @@ extern "C" {
 #define ONE_STAGE_COMP 1
 #define TWO_STAGE_COMP 2
 
+//
+// compressed data first byte foramt
+//   ------ 7 bit ---- | ---- 1 bit ----
+//        algorithm           mode
+//
+
+// compression data mode save first byte lower 1 bit
+#define MODE_NOCOMPRESS  0  // original data
+#define MODE_COMPRESS    1  // compatible old compress
+
+// compression algorithm save first byte higher 7 bit
+#define ALGO_SZ_LOSSY     1 // SZ compress 
+
+#define HEAD_MODE(x)  x%2
+#define HEAD_ALGO(x)  x/2
+
 extern int tsCompressINTImp(const char *const input, const int nelements, char *const output, const char type);
 extern int tsDecompressINTImp(const char *const input, const int nelements, char *const output, const char type);
 extern int tsCompressBoolImp(const char *const input, const int nelements, char *const output);
@@ -46,6 +62,20 @@ extern int tsCompressDoubleImp(const char *const input, const int nelements, cha
 extern int tsDecompressDoubleImp(const char *const input, const int nelements, char *const output);
 extern int tsCompressFloatImp(const char *const input, const int nelements, char *const output);
 extern int tsDecompressFloatImp(const char *const input, const int nelements, char *const output);
+// lossy
+extern int tsCompressFloatLossyImp(const char * input, const int nelements, char *const output);
+extern int tsDecompressFloatLossyImp(const char * input, int compressedSize, const int nelements, char *const output);
+extern int tsCompressDoubleLossyImp(const char * input, const int nelements, char *const output);
+extern int tsDecompressDoubleLossyImp(const char * input, int compressedSize, const int nelements, char *const output);
+
+#ifdef TD_TSZ
+extern bool lossyFloat;
+extern bool lossyDouble;
+// init call
+int tsCompressInit();
+// exit call
+void tsCompressExit();
+#endif
 
 static FORCE_INLINE int tsCompressTinyint(const char *const input, int inputSize, const int nelements, char *const output, int outputSize, char algorithm,
                       char *const buffer, int bufferSize) {
@@ -189,56 +219,123 @@ static FORCE_INLINE int tsDecompressString(const char *const input, int compress
 
 static FORCE_INLINE int tsCompressFloat(const char *const input, int inputSize, const int nelements, char *const output, int outputSize,
                     char algorithm, char *const buffer, int bufferSize) {
-  if (algorithm == ONE_STAGE_COMP) {
-    return tsCompressFloatImp(input, nelements, output);
-  } else if (algorithm == TWO_STAGE_COMP) {
-    int len = tsCompressFloatImp(input, nelements, buffer);
-    return tsCompressStringImp(buffer, len, output, outputSize);
+#ifdef TD_TSZ
+  // lossy mode
+  if(lossyFloat) {
+    return tsCompressFloatLossyImp(input, nelements, output);
+  // lossless mode  
   } else {
-    assert(0);
-    return -1;
+#endif    
+    if (algorithm == ONE_STAGE_COMP) {
+      return tsCompressFloatImp(input, nelements, output);
+    } else if (algorithm == TWO_STAGE_COMP) {
+      int len = tsCompressFloatImp(input, nelements, buffer);
+      return tsCompressStringImp(buffer, len, output, outputSize);
+    } else {
+      assert(0);
+      return -1;
+    }    
+#ifdef TD_TSZ  
   }
+#endif
 }
 
 static FORCE_INLINE int tsDecompressFloat(const char *const input, int compressedSize, const int nelements, char *const output,
                       int outputSize, char algorithm, char *const buffer, int bufferSize) {
-  if (algorithm == ONE_STAGE_COMP) {
-    return tsDecompressFloatImp(input, nelements, output);
-  } else if (algorithm == TWO_STAGE_COMP) {
-    if (tsDecompressStringImp(input, compressedSize, buffer, bufferSize) < 0) return -1;
-    return tsDecompressFloatImp(buffer, nelements, output);
+#ifdef TD_TSZ
+  if(HEAD_ALGO(input[0]) == ALGO_SZ_LOSSY){
+    // decompress lossy
+    return tsDecompressFloatLossyImp(input, compressedSize, nelements, output);
   } else {
-    assert(0);
-    return -1;
+#endif    
+    // decompress lossless
+    if (algorithm == ONE_STAGE_COMP) {
+      return tsDecompressFloatImp(input, nelements, output);
+    } else if (algorithm == TWO_STAGE_COMP) {
+      if (tsDecompressStringImp(input, compressedSize, buffer, bufferSize) < 0) return -1;
+      return tsDecompressFloatImp(buffer, nelements, output);
+    } else {
+      assert(0);
+      return -1;
+    }
+#ifdef TD_TSZ  
   }
+#endif
 }
 
+
 static FORCE_INLINE int tsCompressDouble(const char *const input, int inputSize, const int nelements, char *const output, int outputSize,
                      char algorithm, char *const buffer, int bufferSize) {
-  if (algorithm == ONE_STAGE_COMP) {
-    return tsCompressDoubleImp(input, nelements, output);
-  } else if (algorithm == TWO_STAGE_COMP) {
-    int len = tsCompressDoubleImp(input, nelements, buffer);
-    return tsCompressStringImp(buffer, len, output, outputSize);
+#ifdef TD_TSZ  
+  if(lossyDouble){
+    // lossy mode
+    return tsCompressDoubleLossyImp(input, nelements, output);
   } else {
-    assert(0);
-    return -1;
+#endif    
+    // lossless mode
+    if (algorithm == ONE_STAGE_COMP) {
+      return tsCompressDoubleImp(input, nelements, output);
+    } else if (algorithm == TWO_STAGE_COMP) {
+      int len = tsCompressDoubleImp(input, nelements, buffer);
+      return tsCompressStringImp(buffer, len, output, outputSize);
+    } else {
+      assert(0);
+      return -1;
+    }
+#ifdef TD_TSZ      
   }
+#endif  
 }
 
 static FORCE_INLINE int tsDecompressDouble(const char *const input, int compressedSize, const int nelements, char *const output,
                        int outputSize, char algorithm, char *const buffer, int bufferSize) {
-  if (algorithm == ONE_STAGE_COMP) {
-    return tsDecompressDoubleImp(input, nelements, output);
-  } else if (algorithm == TWO_STAGE_COMP) {
-    if (tsDecompressStringImp(input, compressedSize, buffer, bufferSize) < 0) return -1;
-    return tsDecompressDoubleImp(buffer, nelements, output);
+  #ifdef TD_TSZ  
+  if(HEAD_ALGO(input[0]) == ALGO_SZ_LOSSY){
+    // decompress lossy
+    return tsDecompressDoubleLossyImp(input, compressedSize, nelements, output);
   } else {
-    assert(0);
-    return -1;
+  #endif  
+    // decompress lossless
+    if (algorithm == ONE_STAGE_COMP) {
+      return tsDecompressDoubleImp(input, nelements, output);
+    } else if (algorithm == TWO_STAGE_COMP) {
+      if (tsDecompressStringImp(input, compressedSize, buffer, bufferSize) < 0) return -1;
+      return tsDecompressDoubleImp(buffer, nelements, output);
+    } else {
+      assert(0);
+      return -1;
+    }
+#ifdef TD_TSZ      
   }
+#endif  
 }
 
+#ifdef TD_TSZ  
+//
+//  lossy float double
+//
+static FORCE_INLINE int tsCompressFloatLossy(const char *const input, int inputSize, const int nelements, char *const output, int outputSize,
+                    char algorithm, char *const buffer, int bufferSize) {
+  return tsCompressFloatLossyImp(input, nelements, output);
+}
+
+static FORCE_INLINE int tsDecompressFloatLossy(const char *const input, int compressedSize, const int nelements, char *const output,
+                      int outputSize, char algorithm, char *const buffer, int bufferSize){
+  return tsDecompressFloatLossyImp(input, compressedSize, nelements, output);
+}
+
+static FORCE_INLINE int tsCompressDoubleLossy(const char *const input, int inputSize, const int nelements, char *const output, int outputSize,
+                     char algorithm, char *const buffer, int bufferSize){
+  return tsCompressDoubleLossyImp(input, nelements, output);
+}
+
+static FORCE_INLINE int tsDecompressDoubleLossy(const char *const input, int compressedSize, const int nelements, char *const output,
+                       int outputSize, char algorithm, char *const buffer, int bufferSize){
+  return tsDecompressDoubleLossyImp(input, compressedSize, nelements, output);
+}
+
+#endif
+
 static FORCE_INLINE int tsCompressTimestamp(const char *const input, int inputSize, const int nelements, char *const output, int outputSize,
                         char algorithm, char *const buffer, int bufferSize) {
   if (algorithm == ONE_STAGE_COMP) {
diff --git a/src/util/src/tcompression.c b/src/util/src/tcompression.c
index 1de6e76f71..a11f6a2f3d 100644
--- a/src/util/src/tcompression.c
+++ b/src/util/src/tcompression.c
@@ -49,9 +49,14 @@
 
 #include "os.h"
 #include "lz4.h"
+#ifdef TD_TSZ  
+  #include "td_sz.h"
+#endif
 #include "taosdef.h"
 #include "tscompression.h"
 #include "tulog.h"
+#include "tglobal.h"
+
 
 static const int TEST_NUMBER = 1;
 #define is_bigendian() ((*(char *)&TEST_NUMBER) == 0)
@@ -61,6 +66,39 @@ static const int TEST_NUMBER = 1;
 #define ZIGZAG_ENCODE(T, v) ((u##T)((v) >> (sizeof(T) * 8 - 1))) ^ (((u##T)(v)) << 1)  // zigzag encode
 #define ZIGZAG_DECODE(T, v) ((v) >> 1) ^ -((T)((v)&1))                                 // zigzag decode
 
+#ifdef TD_TSZ
+bool lossyFloat  = false;
+bool lossyDouble = false;
+
+// init call
+int tsCompressInit(){
+  // config 
+  if(lossyColumns[0] == 0){
+    lossyFloat = false;
+    lossyDouble = false;
+    return 0;
+  }
+
+  lossyFloat  = strstr(lossyColumns, "float") != NULL;
+  lossyDouble = strstr(lossyColumns, "double") != NULL;
+
+  if(lossyFloat == false && lossyDouble == false)
+        return 0;
+  
+  tdszInit(fPrecision, dPrecision, maxIntervals, intervals, Compressor);
+  if(lossyFloat)
+     uInfo("lossy compression float  is opened. ");
+  if(lossyDouble)
+     uInfo("lossy compression double is opened. ");
+  return 1;
+}
+// exit call
+void tsCompressExit(){
+   tdszExit();
+}
+
+#endif
+
 /*
  * Compress Integer (Simple8B).
  */
@@ -410,6 +448,7 @@ int tsCompressStringImp(const char *const input, int inputSize, char *const outp
 
 int tsDecompressStringImp(const char *const input, int compressedSize, char *const output, int outputSize) {
   // compressedSize is the size of data after compression.
+  
   if (input[0] == 1) {
     /* It is compressed by LZ4 algorithm */
     const int decompressed_size = LZ4_decompress_safe(input + 1, output, compressedSize - 1, outputSize);
@@ -886,3 +925,72 @@ int tsDecompressFloatImp(const char *const input, const int nelements, char *con
 
   return nelements * FLOAT_BYTES;
 }
+
+#ifdef TD_TSZ  
+//
+//   ----------  float double lossy  -----------
+//
+int tsCompressFloatLossyImp(const char * input, const int nelements, char *const output){
+  // compress with sz 
+  int compressedSize = tdszCompress(SZ_FLOAT, input, nelements, output + 1);
+  unsigned char algo = ALGO_SZ_LOSSY << 1;
+  if (compressedSize == 0 || compressedSize >= nelements*sizeof(float)){
+    // compressed error or large than original
+    output[0] = MODE_NOCOMPRESS | algo;
+    memcpy(output + 1, input, nelements * sizeof(float));
+    compressedSize = 1 + nelements * sizeof(float);
+  } else {
+    // compressed successfully
+    output[0] = MODE_COMPRESS | algo;
+    compressedSize += 1;
+  }
+
+  return compressedSize;
+}
+
+int tsDecompressFloatLossyImp(const char * input, int compressedSize, const int nelements, char *const output){
+  int decompressedSize  = 0;
+  if( HEAD_MODE(input[0]) == MODE_NOCOMPRESS){
+    // orginal so memcpy directly
+    decompressedSize = nelements * sizeof(float);
+    memcpy(output, input + 1, decompressedSize);
+
+    return decompressedSize;
+  } 
+
+  // decompressed with sz
+  return tdszDecompress(SZ_FLOAT, input + 1, compressedSize - 1, nelements, output);
+}
+
+int tsCompressDoubleLossyImp(const char * input, const int nelements, char *const output){
+   // compress with sz 
+  int compressedSize = tdszCompress(SZ_DOUBLE, input, nelements, output + 1);
+  unsigned char algo = ALGO_SZ_LOSSY << 1;
+  if (compressedSize == 0 || compressedSize >= nelements*sizeof(double)) {
+    // compressed error or large than original
+    output[0] = MODE_NOCOMPRESS | algo;
+    memcpy(output + 1, input, nelements * sizeof(double));
+    compressedSize = 1 + nelements * sizeof(double);
+  } else {
+    // compressed successfully
+    output[0] = MODE_COMPRESS | algo;
+    compressedSize += 1;
+  }
+
+  return compressedSize; 
+}
+
+int tsDecompressDoubleLossyImp(const char * input, int compressedSize, const int nelements, char *const output){
+  int decompressedSize  = 0;
+  if( HEAD_MODE(input[0]) == MODE_NOCOMPRESS){
+    // orginal so memcpy directly
+    decompressedSize = nelements * sizeof(double);
+    memcpy(output, input + 1, decompressedSize);
+
+    return decompressedSize;
+  } 
+
+  // decompressed with sz
+  return tdszDecompress(SZ_DOUBLE, input + 1, compressedSize - 1, nelements, output);
+}
+#endif
\ No newline at end of file
diff --git a/src/util/src/tconfig.c b/src/util/src/tconfig.c
index 80071986d6..ea83debfdc 100644
--- a/src/util/src/tconfig.c
+++ b/src/util/src/tconfig.c
@@ -61,6 +61,24 @@ static void taosReadFloatConfig(SGlobalCfg *cfg, char *input_value) {
   }
 }
 
+static void taosReadDoubleConfig(SGlobalCfg *cfg, char *input_value) {
+  double  value = atof(input_value);
+  double *option = (double *)cfg->ptr;
+  if (value < cfg->minValue || value > cfg->maxValue) {
+    uError("config option:%s, input value:%s, out of range[%f, %f], use default value:%f",
+           cfg->option, input_value, cfg->minValue, cfg->maxValue, *option);
+  } else {
+    if (cfg->cfgStatus <= TAOS_CFG_CSTATUS_FILE) {
+      *option = value;
+      cfg->cfgStatus = TAOS_CFG_CSTATUS_FILE;
+    } else {
+      uWarn("config option:%s, input value:%s, is configured by %s, use %f", cfg->option, input_value,
+            tsCfgStatusStr[cfg->cfgStatus], *option);
+    }
+  }
+}
+
+
 static void taosReadInt32Config(SGlobalCfg *cfg, char *input_value) {
   int32_t  value = atoi(input_value);
   int32_t *option = (int32_t *)cfg->ptr;
@@ -262,6 +280,9 @@ static void taosReadConfigOption(const char *option, char *value, char *value2,
       case TAOS_CFG_VTYPE_FLOAT:
         taosReadFloatConfig(cfg, value);
         break;
+      case TAOS_CFG_VTYPE_DOUBLE:
+        taosReadDoubleConfig(cfg, value);
+        break;
       case TAOS_CFG_VTYPE_STRING:
         taosReadStringConfig(cfg, value);
         break;