facebook/zstd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

slow down faster when output speed is limited

Browse Source
This commit is contained in:
Yann Collet 2018-08-09 17:44:30 -07:00
parent 3d7b533f68
commit 9d26cb6a75
1 changed files with 47 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
programs/fileio.c
View File

@ -737,8 +737,13 @@ FIO_compressZstdFrame(const cRess_t* ressPtr,
FILE* const dstFile = ress.dstFile; FILE* const dstFile = ress.dstFile;
U64 compressedfilesize = 0; U64 compressedfilesize = 0;
ZSTD_EndDirective directive = ZSTD_e_continue; ZSTD_EndDirective directive = ZSTD_e_continue;
typedef enum { noChange, slower, faster } speedChange_e;
speedChange_e speedChange = noChange;
unsigned inputBlocked = 0; unsigned inputBlocked = 0;
unsigned lastJobID = 0; unsigned lastJobID = 0;
unsigned long long lastProduced = 0;
unsigned long long lastFlushedSize = 0;
DISPLAYLEVEL(6, "compression using zstd format \n"); DISPLAYLEVEL(6, "compression using zstd format \n");
@ -763,6 +768,7 @@ FIO_compressZstdFrame(const cRess_t* ressPtr,
stillToFlush = 1; stillToFlush = 1;
while ((inBuff.pos != inBuff.size) /* input buffer must be entirely ingested */ while ((inBuff.pos != inBuff.size) /* input buffer must be entirely ingested */
|| (directive == ZSTD_e_end && stillToFlush != 0) ) { || (directive == ZSTD_e_end && stillToFlush != 0) ) {
size_t const oldIPos = inBuff.pos; size_t const oldIPos = inBuff.pos;
ZSTD_outBuffer outBuff = { ress.dstBuffer, ress.dstBufferSize, 0 }; ZSTD_outBuffer outBuff = { ress.dstBuffer, ress.dstBufferSize, 0 };
CHECK_V(stillToFlush, ZSTD_compress_generic(ress.cctx, &outBuff, &inBuff, directive)); CHECK_V(stillToFlush, ZSTD_compress_generic(ress.cctx, &outBuff, &inBuff, directive));
@ -779,21 +785,53 @@ FIO_compressZstdFrame(const cRess_t* ressPtr,
EXM_THROW(25, "Write error : cannot write compressed block"); EXM_THROW(25, "Write error : cannot write compressed block");
compressedfilesize += outBuff.pos; compressedfilesize += outBuff.pos;
} }
/* display notification; and adapt compression level */
if (READY_FOR_UPDATE()) { if (READY_FOR_UPDATE()) {
ZSTD_frameProgression const zfp = ZSTD_getFrameProgression(ress.cctx); ZSTD_frameProgression const zfp = ZSTD_getFrameProgression(ress.cctx);
double const cShare = (double)zfp.produced / (zfp.consumed + !zfp.consumed/*avoid div0*/) * 100; double const cShare = (double)zfp.produced / (zfp.consumed + !zfp.consumed/*avoid div0*/) * 100;
/* check output speed */
if (zfp.currentJobID > 0) {
unsigned long long newlyProduced = zfp.produced - lastProduced;
unsigned long long newlyFlushed = compressedfilesize - lastFlushedSize;
assert(zfp.produced >= lastProduced);
if (newlyProduced == 0) {
DISPLAYLEVEL(6, "no more data compression generation => buffers are full, compression waiting => output (or input) too slow \n")
speedChange = slower;
}
if ( (newlyProduced > (newlyFlushed * 9 / 8))
&& (stillToFlush > ZSTD_BLOCKSIZE_MAX) ) {
DISPLAYLEVEL(6, "production faster than flushing (%llu > %llu) \n", newlyProduced, newlyFlushed);
speedChange = slower;
}
lastProduced = zfp.produced;
lastFlushedSize = compressedfilesize;
}
/* course correct only if there is at least one job completed */
if (zfp.currentJobID > lastJobID) {
DISPLAYLEVEL(6, "compression level adaptation check \n")
/* check input speed */ /* check input speed */
if (zfp.currentJobID >= lastJobID+2) { if (zfp.currentJobID > g_nbWorkers+1) { /* warm up period, to fill all workers */
if (inputBlocked <= 1) { /* small tolerance */ if (inputBlocked <= 1) { /* small tolerance */
DISPLAYLEVEL(6, "input is never blocked => input is too slow \n"); DISPLAYLEVEL(6, "input is never blocked => input is too slow \n");
compressionLevel++; speedChange = slower;
ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_compressionLevel, (unsigned)compressionLevel);
} }
lastJobID = zfp.currentJobID;
inputBlocked = 0; inputBlocked = 0;
} }
if (speedChange == slower) {
DISPLAYLEVEL(6, "slower speed , higher compression \n")
compressionLevel ++;
ZSTD_CCtx_setParameter(ress.cctx, ZSTD_p_compressionLevel, (unsigned)compressionLevel);
speedChange = noChange;
}
lastJobID = zfp.currentJobID;
} /* if (zfp.currentJobID > lastJobID) */
if (g_displayLevel >= 3) { if (g_displayLevel >= 3) {
DISPLAYUPDATE(3, "\r(L%i) Buffered :%4u MB - Consumed :%4u MB - Compressed :%4u MB => %.2f%% ", DISPLAYUPDATE(3, "\r(L%i) Buffered :%4u MB - Consumed :%4u MB - Compressed :%4u MB => %.2f%% ",
compressionLevel, compressionLevel,