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zstd/programs/util.h
Yann Collet d3364aa39e improve benchmark measurement for small inputs 
by invoking time() once per batch, instead of once per compression / decompression.
Batch is dynamically resized so that each round lasts approximately 1 second.

Also : increases time accuracy to nanosecond
2018-02-20 14:58:40 -08:00

784 lines
25 KiB
C
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/*
* Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#ifndef UTIL_H_MODULE
#define UTIL_H_MODULE
#if defined (__cplusplus)
extern "C" {
#endif
/*-****************************************
* Dependencies
******************************************/
#include "platform.h" /* PLATFORM_POSIX_VERSION */
#include <stdlib.h> /* malloc */
#include <stddef.h> /* size_t, ptrdiff_t */
#include <stdio.h> /* fprintf */
#include <string.h> /* strncmp */
#include <sys/types.h> /* stat, utime */
#include <sys/stat.h> /* stat */
#if defined(_MSC_VER)
# include <sys/utime.h> /* utime */
# include <io.h> /* _chmod */
#else
# include <unistd.h> /* chown, stat */
# include <utime.h> /* utime */
#endif
#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC, nanosleep */
#include <errno.h>
#include "mem.h" /* U32, U64 */
/* ************************************************************
* Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW
***************************************************************/
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
# define UTIL_fseek _fseeki64
#elif !defined(__64BIT__) && (PLATFORM_POSIX_VERSION >= 200112L) /* No point defining Large file for 64 bit */
# define UTIL_fseek fseeko
#elif defined(__MINGW32__) && defined(__MSVCRT__) && !defined(__STRICT_ANSI__) && !defined(__NO_MINGW_LFS)
# define UTIL_fseek fseeko64
#else
# define UTIL_fseek fseek
#endif
/*-****************************************
* Sleep functions: Windows - Posix - others
******************************************/
#if defined(_WIN32)
# include <windows.h>
# define SET_REALTIME_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS)
# define UTIL_sleep(s) Sleep(1000*s)
# define UTIL_sleepMilli(milli) Sleep(milli)
#elif PLATFORM_POSIX_VERSION >= 0 /* Unix-like operating system */
# include <unistd.h>
# include <sys/resource.h> /* setpriority */
# if defined(PRIO_PROCESS)
# define SET_REALTIME_PRIORITY setpriority(PRIO_PROCESS, 0, -20)
# else
# define SET_REALTIME_PRIORITY /* disabled */
# endif
# define UTIL_sleep(s) sleep(s)
# if (defined(__linux__) && (PLATFORM_POSIX_VERSION >= 199309L)) || (PLATFORM_POSIX_VERSION >= 200112L) /* nanosleep requires POSIX.1-2001 */
# define UTIL_sleepMilli(milli) { struct timespec t; t.tv_sec=0; t.tv_nsec=milli*1000000ULL; nanosleep(&t, NULL); }
# else
# define UTIL_sleepMilli(milli) /* disabled */
# endif
#else
# define SET_REALTIME_PRIORITY /* disabled */
# define UTIL_sleep(s) /* disabled */
# define UTIL_sleepMilli(milli) /* disabled */
#endif
/* *************************************
* Constants
***************************************/
#define LIST_SIZE_INCREASE (8*1024)
/*-****************************************
* Compiler specifics
******************************************/
#if defined(__INTEL_COMPILER)
# pragma warning(disable : 177) /* disable: message #177: function was declared but never referenced, useful with UTIL_STATIC */
#endif
#if defined(__GNUC__)
# define UTIL_STATIC static __attribute__((unused))
#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
# define UTIL_STATIC static inline
#elif defined(_MSC_VER)
# define UTIL_STATIC static __inline
#else
# define UTIL_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
#endif
/*-****************************************
* Console log
******************************************/
static int g_utilDisplayLevel;
#define UTIL_DISPLAY(...) fprintf(stderr, __VA_ARGS__)
#define UTIL_DISPLAYLEVEL(l, ...) { if (g_utilDisplayLevel>=l) { UTIL_DISPLAY(__VA_ARGS__); } }
/*-****************************************
* Time functions
******************************************/
#if defined(_WIN32) /* Windows */
#define UTIL_TIME_INITIALIZER { { 0, 0 } }
typedef LARGE_INTEGER UTIL_time_t;
UTIL_STATIC UTIL_time_t UTIL_getTime(void) { UTIL_time_t x; QueryPerformanceCounter(&x); return x; }
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
{
static LARGE_INTEGER ticksPerSecond;
static int init = 0;
if (!init) {
if (!QueryPerformanceFrequency(&ticksPerSecond))
UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n");
init = 1;
}
return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
}
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
{
static LARGE_INTEGER ticksPerSecond;
static int init = 0;
if (!init) {
if (!QueryPerformanceFrequency(&ticksPerSecond))
UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n");
init = 1;
}
return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
}
#elif defined(__APPLE__) && defined(__MACH__)
#include <mach/mach_time.h>
#define UTIL_TIME_INITIALIZER 0
typedef U64 UTIL_time_t;
UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return mach_absolute_time(); }
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
{
static mach_timebase_info_data_t rate;
static int init = 0;
if (!init) {
mach_timebase_info(&rate);
init = 1;
}
return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom))/1000ULL;
}
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
{
static mach_timebase_info_data_t rate;
static int init = 0;
if (!init) {
mach_timebase_info(&rate);
init = 1;
}
return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom);
}
#elif (PLATFORM_POSIX_VERSION >= 200112L) && (defined __UCLIBC__ || ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17) || __GLIBC__ > 2))
#define UTIL_TIME_INITIALIZER { 0, 0 }
typedef struct timespec UTIL_freq_t;
typedef struct timespec UTIL_time_t;
UTIL_STATIC UTIL_time_t UTIL_getTime(void)
{
UTIL_time_t time;
if (clock_gettime(CLOCK_MONOTONIC, &time))
UTIL_DISPLAYLEVEL(1, "ERROR: Failed to get time\n"); /* we could also exit() */
return time;
}
UTIL_STATIC UTIL_time_t UTIL_getSpanTime(UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t diff;
if (end.tv_nsec < begin.tv_nsec) {
diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec;
diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec;
} else {
diff.tv_sec = end.tv_sec - begin.tv_sec;
diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
}
return diff;
}
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
U64 micro = 0;
micro += 1000000ULL * diff.tv_sec;
micro += diff.tv_nsec / 1000ULL;
return micro;
}
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
U64 nano = 0;
nano += 1000000000ULL * diff.tv_sec;
nano += diff.tv_nsec;
return nano;
}
#else /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */
typedef clock_t UTIL_time_t;
#define UTIL_TIME_INITIALIZER 0
UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return clock(); }
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
#endif
#define SEC_TO_MICRO 1000000
/* returns time span in microseconds */
UTIL_STATIC U64 UTIL_clockSpanMicro(UTIL_time_t clockStart )
{
UTIL_time_t const clockEnd = UTIL_getTime();
return UTIL_getSpanTimeMicro(clockStart, clockEnd);
}
/* returns time span in microseconds */
UTIL_STATIC U64 UTIL_clockSpanNano(UTIL_time_t clockStart )
{
UTIL_time_t const clockEnd = UTIL_getTime();
return UTIL_getSpanTimeNano(clockStart, clockEnd);
}
UTIL_STATIC void UTIL_waitForNextTick(void)
{
UTIL_time_t const clockStart = UTIL_getTime();
UTIL_time_t clockEnd;
do {
clockEnd = UTIL_getTime();
} while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0);
}
/*-****************************************
* File functions
******************************************/
#if defined(_MSC_VER)
#define chmod _chmod
typedef struct __stat64 stat_t;
#else
typedef struct stat stat_t;
#endif
UTIL_STATIC int UTIL_isRegularFile(const char* infilename);
UTIL_STATIC int UTIL_setFileStat(const char *filename, stat_t *statbuf)
{
int res = 0;
struct utimbuf timebuf;
if (!UTIL_isRegularFile(filename))
return -1;
timebuf.actime = time(NULL);
timebuf.modtime = statbuf->st_mtime;
res += utime(filename, &timebuf); /* set access and modification times */
#if !defined(_WIN32)
res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
#endif
res += chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */
errno = 0;
return -res; /* number of errors is returned */
}
UTIL_STATIC int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
{
int r;
#if defined(_MSC_VER)
r = _stat64(infilename, statbuf);
if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */
#else
r = stat(infilename, statbuf);
if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */
#endif
return 1;
}
UTIL_STATIC int UTIL_isRegularFile(const char* infilename)
{
stat_t statbuf;
return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
}
UTIL_STATIC U32 UTIL_isDirectory(const char* infilename)
{
int r;
stat_t statbuf;
#if defined(_MSC_VER)
r = _stat64(infilename, &statbuf);
if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
#else
r = stat(infilename, &statbuf);
if (!r && S_ISDIR(statbuf.st_mode)) return 1;
#endif
return 0;
}
UTIL_STATIC U32 UTIL_isLink(const char* infilename)
{
#if defined(_WIN32)
/* no symlinks on windows */
(void)infilename;
#else
int r;
stat_t statbuf;
r = lstat(infilename, &statbuf);
if (!r && S_ISLNK(statbuf.st_mode)) return 1;
#endif
return 0;
}
#define UTIL_FILESIZE_UNKNOWN ((U64)(-1))
UTIL_STATIC U64 UTIL_getFileSize(const char* infilename)
{
if (!UTIL_isRegularFile(infilename)) return UTIL_FILESIZE_UNKNOWN;
{ int r;
#if defined(_MSC_VER)
struct __stat64 statbuf;
r = _stat64(infilename, &statbuf);
if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
#elif defined(__MINGW32__) && defined (__MSVCRT__)
struct _stati64 statbuf;
r = _stati64(infilename, &statbuf);
if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
if (r || !S_ISREG(statbuf.st_mode)) return UTIL_FILESIZE_UNKNOWN;
#endif
return (U64)statbuf.st_size;
}
}
UTIL_STATIC U64 UTIL_getTotalFileSize(const char* const * const fileNamesTable, unsigned nbFiles)
{
U64 total = 0;
int error = 0;
unsigned n;
for (n=0; n<nbFiles; n++) {
U64 const size = UTIL_getFileSize(fileNamesTable[n]);
error |= (size == UTIL_FILESIZE_UNKNOWN);
total += size;
}
return error ? UTIL_FILESIZE_UNKNOWN : total;
}
/*
* A modified version of realloc().
* If UTIL_realloc() fails the original block is freed.
*/
UTIL_STATIC void *UTIL_realloc(void *ptr, size_t size)
{
void *newptr = realloc(ptr, size);
if (newptr) return newptr;
free(ptr);
return NULL;
}
#ifdef _WIN32
# define UTIL_HAS_CREATEFILELIST
UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
{
char* path;
int dirLength, fnameLength, pathLength, nbFiles = 0;
WIN32_FIND_DATAA cFile;
HANDLE hFile;
dirLength = (int)strlen(dirName);
path = (char*) malloc(dirLength + 3);
if (!path) return 0;
memcpy(path, dirName, dirLength);
path[dirLength] = '\\';
path[dirLength+1] = '*';
path[dirLength+2] = 0;
hFile=FindFirstFileA(path, &cFile);
if (hFile == INVALID_HANDLE_VALUE) {
UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s'\n", dirName);
return 0;
}
free(path);
do {
fnameLength = (int)strlen(cFile.cFileName);
path = (char*) malloc(dirLength + fnameLength + 2);
if (!path) { FindClose(hFile); return 0; }
memcpy(path, dirName, dirLength);
path[dirLength] = '\\';
memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
pathLength = dirLength+1+fnameLength;
path[pathLength] = 0;
if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
if (strcmp (cFile.cFileName, "..") == 0 ||
strcmp (cFile.cFileName, ".") == 0) continue;
nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
}
else if ((cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)) {
if (*bufStart + *pos + pathLength >= *bufEnd) {
ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
*bufEnd = *bufStart + newListSize;
if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
}
if (*bufStart + *pos + pathLength < *bufEnd) {
strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
*pos += pathLength + 1;
nbFiles++;
}
}
free(path);
} while (FindNextFileA(hFile, &cFile));
FindClose(hFile);
return nbFiles;
}
#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
# define UTIL_HAS_CREATEFILELIST
# include <dirent.h> /* opendir, readdir */
# include <string.h> /* strerror, memcpy */
UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
{
DIR *dir;
struct dirent *entry;
char* path;
int dirLength, fnameLength, pathLength, nbFiles = 0;
if (!(dir = opendir(dirName))) {
UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
return 0;
}
dirLength = (int)strlen(dirName);
errno = 0;
while ((entry = readdir(dir)) != NULL) {
if (strcmp (entry->d_name, "..") == 0 ||
strcmp (entry->d_name, ".") == 0) continue;
fnameLength = (int)strlen(entry->d_name);
path = (char*) malloc(dirLength + fnameLength + 2);
if (!path) { closedir(dir); return 0; }
memcpy(path, dirName, dirLength);
path[dirLength] = '/';
memcpy(path+dirLength+1, entry->d_name, fnameLength);
pathLength = dirLength+1+fnameLength;
path[pathLength] = 0;
if (!followLinks && UTIL_isLink(path)) {
UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path);
continue;
}
if (UTIL_isDirectory(path)) {
nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
} else {
if (*bufStart + *pos + pathLength >= *bufEnd) {
ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
*bufEnd = *bufStart + newListSize;
if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
}
if (*bufStart + *pos + pathLength < *bufEnd) {
strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
*pos += pathLength + 1;
nbFiles++;
}
}
free(path);
errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
}
if (errno != 0) {
UTIL_DISPLAYLEVEL(1, "readdir(%s) error: %s\n", dirName, strerror(errno));
free(*bufStart);
*bufStart = NULL;
}
closedir(dir);
return nbFiles;
}
#else
UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
{
(void)bufStart; (void)bufEnd; (void)pos;
UTIL_DISPLAYLEVEL(1, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
return 0;
}
#endif /* #ifdef _WIN32 */
/*
* UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
* and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
* After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
* In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
*/
UTIL_STATIC const char** UTIL_createFileList(const char **inputNames, unsigned inputNamesNb, char** allocatedBuffer, unsigned* allocatedNamesNb, int followLinks)
{
size_t pos;
unsigned i, nbFiles;
char* buf = (char*)malloc(LIST_SIZE_INCREASE);
char* bufend = buf + LIST_SIZE_INCREASE;
const char** fileTable;
if (!buf) return NULL;
for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
if (!UTIL_isDirectory(inputNames[i])) {
size_t const len = strlen(inputNames[i]);
if (buf + pos + len >= bufend) {
ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
buf = (char*)UTIL_realloc(buf, newListSize);
bufend = buf + newListSize;
if (!buf) return NULL;
}
if (buf + pos + len < bufend) {
strncpy(buf + pos, inputNames[i], bufend - (buf + pos));
pos += len + 1;
nbFiles++;
}
} else {
nbFiles += UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend, followLinks);
if (buf == NULL) return NULL;
} }
if (nbFiles == 0) { free(buf); return NULL; }
fileTable = (const char**)malloc((nbFiles+1) * sizeof(const char*));
if (!fileTable) { free(buf); return NULL; }
for (i=0, pos=0; i<nbFiles; i++) {
fileTable[i] = buf + pos;
pos += strlen(fileTable[i]) + 1;
}
if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; }
*allocatedBuffer = buf;
*allocatedNamesNb = nbFiles;
return fileTable;
}
UTIL_STATIC void UTIL_freeFileList(const char** filenameTable, char* allocatedBuffer)
{
if (allocatedBuffer) free(allocatedBuffer);
if (filenameTable) free((void*)filenameTable);
}
/* count the number of physical cores */
#if defined(_WIN32) || defined(WIN32)
#include <windows.h>
typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
UTIL_STATIC int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
{ LPFN_GLPI glpi;
BOOL done = FALSE;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
DWORD returnLength = 0;
size_t byteOffset = 0;
glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")),
"GetLogicalProcessorInformation");
if (glpi == NULL) {
goto failed;
}
while(!done) {
DWORD rc = glpi(buffer, &returnLength);
if (FALSE == rc) {
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
if (buffer)
free(buffer);
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
if (buffer == NULL) {
perror("zstd");
exit(1);
}
} else {
/* some other error */
goto failed;
}
} else {
done = TRUE;
}
}
ptr = buffer;
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) {
if (ptr->Relationship == RelationProcessorCore) {
numPhysicalCores++;
}
ptr++;
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
}
free(buffer);
return numPhysicalCores;
}
failed:
/* try to fall back on GetSystemInfo */
{ SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
numPhysicalCores = sysinfo.dwNumberOfProcessors;
if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */
}
return numPhysicalCores;
}
#elif defined(__APPLE__)
#include <sys/sysctl.h>
/* Use apple-provided syscall
* see: man 3 sysctl */
UTIL_STATIC int UTIL_countPhysicalCores(void)
{
static S32 numPhysicalCores = 0; /* apple specifies int32_t */
if (numPhysicalCores != 0) return numPhysicalCores;
{ size_t size = sizeof(S32);
int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
if (ret != 0) {
if (errno == ENOENT) {
/* entry not present, fall back on 1 */
numPhysicalCores = 1;
} else {
perror("zstd: can't get number of physical cpus");
exit(1);
}
}
return numPhysicalCores;
}
}
#elif defined(__linux__)
/* parse /proc/cpuinfo
* siblings / cpu cores should give hyperthreading ratio
* otherwise fall back on sysconf */
UTIL_STATIC int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
return numPhysicalCores = 1;
}
/* try to determine if there's hyperthreading */
{ FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
#define BUF_SIZE 80
char buff[BUF_SIZE];
int siblings = 0;
int cpu_cores = 0;
int ratio = 1;
if (cpuinfo == NULL) {
/* fall back on the sysconf value */
return numPhysicalCores;
}
/* assume the cpu cores/siblings values will be constant across all
* present processors */
while (!feof(cpuinfo)) {
if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) {
if (strncmp(buff, "siblings", 8) == 0) {
const char* const sep = strchr(buff, ':');
if (*sep == '\0') {
/* formatting was broken? */
goto failed;
}
siblings = atoi(sep + 1);
}
if (strncmp(buff, "cpu cores", 9) == 0) {
const char* const sep = strchr(buff, ':');
if (*sep == '\0') {
/* formatting was broken? */
goto failed;
}
cpu_cores = atoi(sep + 1);
}
} else if (ferror(cpuinfo)) {
/* fall back on the sysconf value */
goto failed;
}
}
if (siblings && cpu_cores) {
ratio = siblings / cpu_cores;
}
failed:
fclose(cpuinfo);
return numPhysicalCores = numPhysicalCores / ratio;
}
}
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
/* Use apple-provided syscall
* see: man 3 sysctl */
UTIL_STATIC int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;
if (numPhysicalCores != 0) return numPhysicalCores;
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
return numPhysicalCores = 1;
}
return numPhysicalCores;
}
#else
UTIL_STATIC int UTIL_countPhysicalCores(void)
{
/* assume 1 */
return 1;
}
#endif
#if defined (__cplusplus)
}
#endif
#endif /* UTIL_H_MODULE */
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