AuroraMiddleware/zstd
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Merge pull request #2355 from senhuang42/change_ldm_mt_config

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Reduce --long mode MT jobsize at higher levels
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Yann Collet 2020-10-16 13:35:50 -07:00 committed by GitHub
commit a0ec50c2dc
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2 changed files with 3 additions and 3 deletions
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4
lib/compress/zstdmt_compress.c
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@ -1192,8 +1192,8 @@ static unsigned ZSTDMT_computeTargetJobLog(const ZSTD_CCtx_params* params)
if (params->ldmParams.enableLdm) {
/* In Long Range Mode, the windowLog is typically oversized.
* In which case, it's preferable to determine the jobSize
* based on chainLog instead. */
jobLog = MAX(21, params->cParams.chainLog + 4);
* based on cycleLog instead. */
jobLog = MAX(21, ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy) + 3);
} else {
jobLog = MAX(20, params->cParams.windowLog + 2);
}

2
programs/fileio.c
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@ -909,7 +909,7 @@ static void FIO_adjustParamsForPatchFromMode(FIO_prefs_t* const prefs,
if (fileWindowLog > ZSTD_WINDOWLOG_MAX)
DISPLAYLEVEL(1, "Max window log exceeded by file (compression ratio will suffer)\n");
comprParams->windowLog = MIN(ZSTD_WINDOWLOG_MAX, fileWindowLog);
if (fileWindowLog > ZSTD_cycleLog(cParams.hashLog, cParams.strategy)) {
if (fileWindowLog > ZSTD_cycleLog(cParams.chainLog, cParams.strategy)) {
if (!prefs->ldmFlag)
DISPLAYLEVEL(1, "long mode automatically triggered\n");
FIO_setLdmFlag(prefs, 1);