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Merge pull request #957 from facebook/nbThreads

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zstdmt via compress_generic: reduce opportunity to free/create mtctx
This commit is contained in:
Yann Collet 2017-12-18 16:04:14 -08:00 committed by GitHub
commit aa0c09bdc9
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3 changed files with 18 additions and 2 deletions
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4
lib/compress/zstd_compress.c
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@ -2851,7 +2851,9 @@ size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
if ((cctx->pledgedSrcSizePlusOne-1) <= ZSTDMT_JOBSIZE_MIN)
params.nbThreads = 1; /* do not invoke multi-threading when src size is too small */
if (params.nbThreads > 1) {
if (cctx->mtctx == NULL || cctx->appliedParams.nbThreads != params.nbThreads) {
if (cctx->mtctx == NULL || (params.nbThreads != ZSTDMT_getNbThreads(cctx->mtctx))) {
DEBUGLOG(4, "ZSTD_compress_generic: creating new mtctx for nbThreads=%u (previous: %u)",
params.nbThreads, ZSTDMT_getNbThreads(cctx->mtctx));
ZSTDMT_freeCCtx(cctx->mtctx);
cctx->mtctx = ZSTDMT_createCCtx_advanced(params.nbThreads, cctx->customMem);
if (cctx->mtctx == NULL) return ERROR(memory_allocation);

9
lib/compress/zstdmt_compress.c
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@ -459,6 +459,15 @@ size_t ZSTDMT_CCtxParam_setNbThreads(ZSTD_CCtx_params* params, unsigned nbThread
return nbThreads;
}
/* ZSTDMT_getNbThreads():
* @return nb threads currently active in mtctx.
* mtctx must be valid */
size_t ZSTDMT_getNbThreads(const ZSTDMT_CCtx* mtctx)
{
assert(mtctx != NULL);
return mtctx->params.nbThreads;
}
ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbThreads, ZSTD_customMem cMem)
{
ZSTDMT_CCtx* mtctx;

7
lib/compress/zstdmt_compress.h
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@ -114,9 +114,14 @@ size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_param
/* ZSTDMT_CCtxParam_setNbThreads()
* Set nbThreads, and clamp it correctly,
* but also reset jobSize and overlapLog */
* also reset jobSize and overlapLog */
size_t ZSTDMT_CCtxParam_setNbThreads(ZSTD_CCtx_params* params, unsigned nbThreads);
/* ZSTDMT_getNbThreads():
* @return nb threads currently active in mtctx.
* mtctx must be valid */
size_t ZSTDMT_getNbThreads(const ZSTDMT_CCtx* mtctx);
/*! ZSTDMT_initCStream_internal() :
* Private use only. Init streaming operation.
* expects params to be valid.