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bounds for --adapt mode

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can supply min and max compression level through advanced command :
--adapt=min=#,max=#
This commit is contained in:
Yann Collet
2018-09-24 18:16:08 -07:00
parent 04f47bbdd2
commit 6c51bf420c
5 changed files with 90 additions and 18 deletions
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18
programs/fileio.c
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@ -292,6 +292,20 @@ void FIO_setAdaptiveMode(unsigned adapt) {
EXM_THROW(1, "Adaptive mode is not compatible with single thread mode \n");
g_adaptiveMode = adapt;
}
static int g_minAdaptLevel = -50; /* initializing this value requires a constant, so ZSTD_minCLevel() doesn't work */
void FIO_setAdaptMin(int minCLevel)
{
#ifndef ZSTD_NOCOMPRESS
assert(minCLevel >= ZSTD_minCLevel());
#endif
g_minAdaptLevel = minCLevel;
}
static int g_maxAdaptLevel = 22; /* initializing this value requires a constant, so ZSTD_maxCLevel() doesn't work */
void FIO_setAdaptMax(int maxCLevel)
{
g_maxAdaptLevel = maxCLevel;
}
static U32 g_ldmFlag = 0;
void FIO_setLdmFlag(unsigned ldmFlag) {
g_ldmFlag = (ldmFlag>0);
@ -954,13 +968,15 @@ FIO_compressZstdFrame(const cRess_t* ressPtr,
if (speedChange == slower) {
DISPLAYLEVEL(6, "slower speed , higher compression \n")
compressionLevel ++;
compressionLevel += (compressionLevel == 0); /* skip 0 */
if (compressionLevel > ZSTD_maxCLevel()) compressionLevel = ZSTD_maxCLevel();
if (compressionLevel > g_maxAdaptLevel) compressionLevel = g_maxAdaptLevel;
compressionLevel += (compressionLevel == 0); /* skip 0 */
ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_compressionLevel, (unsigned)compressionLevel);
}
if (speedChange == faster) {
DISPLAYLEVEL(6, "faster speed , lighter compression \n")
compressionLevel --;
if (compressionLevel < g_minAdaptLevel) compressionLevel = g_minAdaptLevel;
compressionLevel -= (compressionLevel == 0); /* skip 0 */
ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_compressionLevel, (unsigned)compressionLevel);
}