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enh(query): prepare the buffer on the stack, instead of heap.

This commit is contained in:
Haojun Liao 2023-01-13 14:49:07 +08:00
parent eea9d4f21d
commit cd6532ca7e
1 changed files with 15 additions and 29 deletions
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44
source/dnode/vnode/src/meta/metaCache.c
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@ -33,7 +33,8 @@ typedef struct SMetaStbStatsEntry {
typedef struct STagFilterResEntry {
SList list; // the linked list of md5 digest, extracted from the serialized tag query condition
uint32_t qTimes; // queried times for current super table
uint32_t hitTimes; // queried times for current super table
uint32_t accTime;
} STagFilterResEntry;
struct SMetaCache {
@ -54,6 +55,7 @@ struct SMetaCache {
// query cache
struct STagFilterResCache {
TdThreadMutex lock;
uint32_t accTimes;
SHashObj* pTableEntry;
SLRUCache* pUidResCache;
} sTagFilterResCache;
@ -448,27 +450,6 @@ static int checkAllEntriesInCache(const STagFilterResEntry* pEntry, SArray* pInv
return 0;
}
#define NEED_CHECK_CACHE_ITEM(_size, _acc_times) ((_size) >= 300 || (_acc_times) > 5000)
static void removeInvalidCacheItem(SArray* pInvalidRes, struct STagFilterResEntry* pEntry, bool triggerByGet) {
if (pInvalidRes == NULL) {
return;
}
// remove the keys, of which query uid lists have been replaced already.
int32_t s = taosArrayGetSize(pInvalidRes);
for (int32_t i = 0; i < s; ++i) {
SListNode** p1 = taosArrayGet(pInvalidRes, i);
tdListPopNode(&(pEntry->list), *p1);
taosMemoryFree(*p1);
}
metaInfo("clear %d items in cache, remain:%d, acctime:%d, trigger by get:%d", s, listNEles(&pEntry->list),
pEntry->qTimes, triggerByGet);
pEntry->qTimes = 0; // reset the query times
taosArrayDestroy(pInvalidRes);
}
int32_t metaGetCachedTableUidList(SMeta* pMeta, tb_uid_t suid, const uint8_t* pKey, int32_t keyLen, SArray* pList1,
bool* acquireRes) {
// generate the composed key for LRU cache
@ -485,6 +466,7 @@ int32_t metaGetCachedTableUidList(SMeta* pMeta, tb_uid_t suid, const uint8_t* pK
memcpy(&buf[2], pKey, keyLen);
taosThreadMutexLock(pLock);
pMeta->pCache->sTagFilterResCache.accTimes += 1;
int32_t len = keyLen + sizeof(uint64_t) * 2;
LRUHandle* pHandle = taosLRUCacheLookup(pCache, buf, len);
@ -504,7 +486,13 @@ int32_t metaGetCachedTableUidList(SMeta* pMeta, tb_uid_t suid, const uint8_t* pK
// set the result into the buffer
taosArrayAddBatch(pList1, p + sizeof(int32_t), size);
(*pEntry)->qTimes += 1;
(*pEntry)->hitTimes += 1;
int32_t acc = pMeta->pCache->sTagFilterResCache.accTimes;
if ((*pEntry)->hitTimes % 5000 == 8 && (*pEntry)->hitTimes > 0) {
metaInfo("cache hit:%d, total acc:%d, rate:%.2f", (*pEntry)->hitTimes, acc, ((double)(*pEntry)->hitTimes)/acc);
}
taosLRUCacheRelease(pCache, pHandle, false);
// unlock meta
@ -539,8 +527,8 @@ static void freePayload(const void* key, size_t keyLen, void* value) {
tdListPopNode(&((*pEntry)->list), pNode);
int64_t et = taosGetTimestampUs();
metaInfo("clear items in cache, remain cached item:%d, elapsed time:%.2fms, acc count:%d", listNEles(&((*pEntry)->list)),
(et - st)/1000.0, (*pEntry)->qTimes);
metaInfo("clear items in cache, remain cached item:%d, elapsed time:%.2fms", listNEles(&((*pEntry)->list)),
(et - st)/1000.0);
return;
}
}
@ -555,7 +543,7 @@ static int32_t addNewEntry(SHashObj* pTableEntry, const void* pKey, int32_t keyL
return TSDB_CODE_OUT_OF_MEMORY;
}
p->qTimes = 1;
p->hitTimes = 0;
tdListInit(&p->list, keyLen);
taosHashPut(pTableEntry, &suid, sizeof(uint64_t), &p, POINTER_BYTES);
tdListAppend(&p->list, pKey);
@ -605,8 +593,6 @@ int32_t metaUidFilterCachePut(SMeta* pMeta, uint64_t suid, const void* pKey, int
}
} else {
// check if it exists or not
(*pEntry)->qTimes += 1;
size_t size = listNEles(&(*pEntry)->list);
if (size == 0) {
tdListAppend(&(*pEntry)->list, pKey);
@ -661,7 +647,7 @@ int32_t metaUidCacheClear(SMeta* pMeta, uint64_t suid) {
taosLRUCacheErase(pMeta->pCache->sTagFilterResCache.pUidResCache, p, keyLen);
}
(*pEntry)->qTimes = 0;
(*pEntry)->hitTimes = 0;
tdListEmpty(&(*pEntry)->list);
taosThreadMutexUnlock(pLock);