d2ce93179f
This allows Julia to set a default number of threads (usually `1`) to be used when no other thread counts are specified [0], to short-circuit the default OpenBLAS thread initialization routine that spins up a different number of threads than Julia would otherwise choose. The reason to add a new environment variable is that we want to be able to configure OpenBLAS to avoid performing its initial memory allocation/thread startup, as that can consume significant amounts of memory, but we still want to be sensitive to legacy codebases that set things like `OMP_NUM_THREADS` or `GOTOBLAS_NUM_THREADS`. Creating a new environment variable that is openblas-specific and is not already publicly used to control the overall number of threads of programs like Julia seems to be the best way forward. [0] https://github.com/JuliaLang/julia/pull/46844
98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/***************************************************************************
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Copyright (c) 2011-2016, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include "common.h"
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static int openblas_env_verbose=0;
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static unsigned int openblas_env_thread_timeout=0;
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static int openblas_env_block_factor=0;
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static int openblas_env_openblas_num_threads=0;
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static int openblas_env_goto_num_threads=0;
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static int openblas_env_omp_num_threads=0;
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static int openblas_env_omp_adaptive=0;
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int openblas_verbose() { return openblas_env_verbose;}
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unsigned int openblas_thread_timeout() { return openblas_env_thread_timeout;}
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int openblas_block_factor() { return openblas_env_block_factor;}
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int openblas_num_threads_env() { return openblas_env_openblas_num_threads;}
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int openblas_goto_num_threads_env() { return openblas_env_goto_num_threads;}
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int openblas_omp_num_threads_env() { return openblas_env_omp_num_threads;}
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int openblas_omp_adaptive_env() { return openblas_env_omp_adaptive;}
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void openblas_read_env() {
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int ret=0;
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env_var_t p;
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if (readenv(p,"OPENBLAS_VERBOSE")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_verbose=ret;
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ret=0;
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if (readenv(p,"OPENBLAS_BLOCK_FACTOR")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_block_factor=ret;
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ret=0;
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if (readenv(p,"OPENBLAS_THREAD_TIMEOUT")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_thread_timeout=(unsigned int)ret;
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ret=0;
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if (readenv(p,"OPENBLAS_DEFAULT_NUM_THREADS")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_openblas_num_threads=ret;
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ret=0;
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if (readenv(p,"OPENBLAS_NUM_THREADS")) ret = atoi(p);
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if(ret<0) ret=0;
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if(ret != 0 || openblas_env_openblas_num_threads == 0)
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openblas_env_openblas_num_threads=ret;
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ret=0;
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if (readenv(p,"GOTO_NUM_THREADS")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_goto_num_threads=ret;
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ret=0;
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if (readenv(p,"OMP_NUM_THREADS")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_omp_num_threads=ret;
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ret=0;
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if (readenv(p,"OMP_ADAPTIVE")) ret = atoi(p);
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if(ret<0) ret=0;
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openblas_env_omp_adaptive=ret;
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}
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