AuroraMiddleware/zstd
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zstdmt : fixed very large window sizes

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would create too large buffers,
since default job size == window size * 4.

This would crash on 32-bit systems.

Also : jobSize being a 32-bit unsigned, it cannot be >= 4 GB,
so the formula was failing for large window sizes >= 1 GB.
Fixed now : max job Size is 2 GB, whatever the window size.
This commit is contained in:
Yann Collet 2018-01-17 12:39:58 -08:00
parent 58dd7de640
commit d14cc881b0
1 changed files with 10 additions and 2 deletions
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12
lib/compress/zstdmt_compress.c
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@ -11,6 +11,7 @@
/* ====== Tuning parameters ====== */
#define ZSTDMT_NBTHREADS_MAX 200
#define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (2 GB)) /* note : limited by `jobSize` type, which is `unsigned` */
#define ZSTDMT_OVERLAPLOG_DEFAULT 6
@ -843,7 +844,14 @@ size_t ZSTDMT_initCStream_internal(
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
assert(zcs->cctxPool->totalCCtx == params.nbThreads);
zcs->singleBlockingThread = pledgedSrcSize <= ZSTDMT_JOBSIZE_MIN; /* do not trigger multi-threading when srcSize is too small */
zcs->singleBlockingThread = (pledgedSrcSize <= ZSTDMT_JOBSIZE_MIN); /* do not trigger multi-threading when srcSize is too small */
if (params.jobSize == 0) {
if (params.cParams.windowLog >= 29)
params.jobSize = ZSTDMT_JOBSIZE_MAX;
else
params.jobSize = 1 << (params.cParams.windowLog + 2);
}
if (params.jobSize > ZSTDMT_JOBSIZE_MAX) params.jobSize = ZSTDMT_JOBSIZE_MAX;
if (zcs->singleBlockingThread) {
ZSTD_CCtx_params const singleThreadParams = ZSTDMT_initJobCCtxParams(params);
@ -879,7 +887,7 @@ size_t ZSTDMT_initCStream_internal(
assert(params.overlapSizeLog <= 9);
zcs->targetPrefixSize = (params.overlapSizeLog==0) ? 0 : (size_t)1 << (params.cParams.windowLog - (9 - params.overlapSizeLog));
DEBUGLOG(4, "overlapLog=%u => %u KB", params.overlapSizeLog, (U32)(zcs->targetPrefixSize>>10));
zcs->targetSectionSize = params.jobSize ? params.jobSize : (size_t)1 << (params.cParams.windowLog + 2);
zcs->targetSectionSize = params.jobSize;
if (zcs->targetSectionSize < ZSTDMT_JOBSIZE_MIN) zcs->targetSectionSize = ZSTDMT_JOBSIZE_MIN;
if (zcs->targetSectionSize < zcs->targetPrefixSize) zcs->targetSectionSize = zcs->targetPrefixSize; /* job size must be >= overlap size */
DEBUGLOG(4, "Job Size : %u KB (note : set to %u)", (U32)(zcs->targetSectionSize>>10), params.jobSize);