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improved timer accuracy

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This commit is contained in:
inikep 2016-03-18 12:49:44 +01:00
parent 5b15865413
commit 1c1e6916e4
3 changed files with 25 additions and 5 deletions
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8
lib/zstd_decompress.c
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@ -687,12 +687,16 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
offset = 1-offset; offset = 1-offset;
if (offset != 0) if (offset != 0)
{ {
#if 1
size_t temp = seqState->prevOffset[offset]; size_t temp = seqState->prevOffset[offset];
if (offset != 1) { if (offset != 1) {
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2]; if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1]; seqState->prevOffset[2] = seqState->prevOffset[1];
} }
offset = temp; offset = temp;
#else
offset = seqState->prevOffset[1];
#endif
seqState->prevOffset[1] = seqState->prevOffset[0]; seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset; seqState->prevOffset[0] = offset;
} }
@ -701,8 +705,8 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
} else { } else {
offset -= ZSTD_REP_MOVE; offset -= ZSTD_REP_MOVE;
#if 0 #if 0
seqState->prevOffset[3] = seqState->prevOffset[2]; // seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1]; // seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0]; seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset; seqState->prevOffset[0] = offset;
#else #else

2
lib/zstd_internal.h
View File

@ -71,7 +71,7 @@
#else #else
#define ZSTD_REP_NUM 1 #define ZSTD_REP_NUM 1
#define ZSTD_REP_INIT 2 #define ZSTD_REP_INIT 2
#define ZSTD_REP_MOVE (ZSTD_REP_NUM-1) #define ZSTD_REP_MOVE 0//(ZSTD_REP_NUM-1)
#endif #endif
#define KB *(1 <<10) #define KB *(1 <<10)

20
programs/bench.c
View File

@ -44,13 +44,22 @@
/* ************************************* /* *************************************
* Includes * Includes
***************************************/ ***************************************/
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(WIN64) || defined(_WIN64)
#define WINDOWS
#endif
#include <stdlib.h> /* malloc, free */ #include <stdlib.h> /* malloc, free */
#include <string.h> /* memset */ #include <string.h> /* memset */
#include <stdio.h> /* fprintf, fopen, ftello64 */ #include <stdio.h> /* fprintf, fopen, ftello64 */
#include <sys/types.h> /* stat64 */ #include <sys/types.h> /* stat64 */
#include <sys/stat.h> /* stat64 */ #include <sys/stat.h> /* stat64 */
#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC */ #include <time.h> /* clock_t, clock, CLOCKS_PER_SEC */
#ifdef WINDOWS
#define mili_sleep(mili) Sleep(mili)
#else
#define mili_sleep(mili) usleep(mili*1000)
#include <sys/resource.h> /* setpriority */
#endif
/* sleep : posix - windows - others */ /* sleep : posix - windows - others */
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) #if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__)))
# include <unistd.h> # include <unistd.h>
@ -283,6 +292,7 @@ static int BMK_benchMem(const void* srcBuffer, size_t srcSize,
memset(compressedBuffer, 0xE5, maxCompressedSize); /* warm up and erase result buffer */ memset(compressedBuffer, 0xE5, maxCompressedSize); /* warm up and erase result buffer */
nbLoops = 0; nbLoops = 0;
mili_sleep(1); // give processor to other processes
clockStart = clock(); clockStart = clock();
while (clock() == clockStart); while (clock() == clockStart);
clockStart = clock(); clockStart = clock();
@ -313,6 +323,7 @@ static int BMK_benchMem(const void* srcBuffer, size_t srcSize,
memset(resultBuffer, 0xD6, srcSize); /* warm result buffer */ memset(resultBuffer, 0xD6, srcSize); /* warm result buffer */
nbLoops = 0; nbLoops = 0;
mili_sleep(1); // give processor to other processes
clockStart = clock(); clockStart = clock();
while (clock() == clockStart); while (clock() == clockStart);
clockStart = clock(); clockStart = clock();
@ -413,6 +424,11 @@ static void BMK_benchCLevel(void* srcBuffer, size_t benchedSize,
{ {
benchResult_t result, total; benchResult_t result, total;
int l; int l;
#ifdef WINDOWS
SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
#else
setpriority(PRIO_PROCESS, 0, -20);
#endif
const char* pch = strrchr(displayName, '\\'); /* Windows */ const char* pch = strrchr(displayName, '\\'); /* Windows */
if (!pch) pch = strrchr(displayName, '/'); /* Linux */ if (!pch) pch = strrchr(displayName, '/'); /* Linux */