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|
%% options
copyright owner = Dirk Krause
copyright year = 2002-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
/** @defgroup coressrc Source for cores information
*/
/**@{*/
/** No information found.
*/
#define DK3_CORES_SRC_NONE (-1)
/** System call succeeded.
*/
#define DK3_CORES_SRC_SYSTEM 0
/** Environment variable NUMBER_OF_PROCESSORS on Windows.
*/
#define DK3_CORES_SRC_ENVIRONMENT 1
/** File /proc/cpuinfo on *x systems.
*/
#define DK3_CORES_SRC_CPUINFO 2
/** The /threads/max preference.
*/
#define DK3_CORES_SRC_PREFERENCE 3
/**@}*/
#ifdef __cplusplus
extern "C" {
#endif
/** Retrieve number of processor cores on system.
@param src Pointer to information source indicator variable,
may be NULL.
@return Number of processor cores found.
*/
size_t
dk3cores_get_num(int *src);
/** Check whether we run on WOW6432.
@return 1 for WOW6432, 0 otherwise.
*/
int
dk3cores_is_wow64(void);
/** Get maximum number of threads.
The number is retrieved from the /threads/max preference if
available, or derived from the number of cores available
(back = (n > 2) ? (n - 1) : 1) to leave one core for
GUI or desktop session.
@param app Application to use for preferences retrieval.
@param src Pointer to information source indicator variable,
may be NULL.
@return Number of threas to use maximally.
*/
size_t
dk3cores_max_threads(dk3_app_t *app, int *src);
#ifdef __cplusplus
}
#endif
%% module
#ifndef _WIN32_WINNT
/** On Windows use minimum Windows version required for functions
in this module.
*/
#define _WIN32_WINNT 0x0501
#endif
#include "dk3all.h"
#if MACOS || DK3_HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#include "dk3cores.h"
#include "dk3unused.h"
$!trace-include
#if DK3_ON_WINDOWS
typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
typedef void (WINAPI *LPFN_GETSYSTEMINFO) (LPSYSTEM_INFO);
#endif
int
dk3cores_is_wow64(void)
{
int back = 0;
#if DK3_ON_WINDOWS
LPFN_ISWOW64PROCESS fnIsWow64Process; /* Function address */
BOOL bIsWow64 = FALSE; /* Flag: Is Wow64 process. */
#if DK3_CHAR_SIZE > 1
fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
GetModuleHandleW( L"kernel32" ), "IsWow64Process"
);
#else
fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
GetModuleHandleA("kernel32"), "IsWow64Process"
);
#endif
if(NULL != fnIsWow64Process) {
if(fnIsWow64Process(GetCurrentProcess(), &bIsWow64)) {
if(bIsWow64) { back = 1; }
}
}
#endif
return back;
}
#if !DK3_ON_WINDOWS
/** Compare two unsigned long numbers.
@param l Pointer to left number.
@param r Pointer to right number.
@param cr Comparison criteria, ignored.
@return Comparison result.
*/
static
int
dk3cores_compare_lu(void const *l, void const *r, int DK3_ARG_UNUSED(cr) )
{
int back = 0;
unsigned long const *ull;
unsigned long const *ulr;
DK3_UNUSED_ARG(cr)
if(l) {
if(r) {
ull = (unsigned long const *)l;
ulr = (unsigned long const *)r;
if((*ull) > (*ulr)) {
back = 1;
} else {
if((*ull) < (*ulr)) {
back = -1;
}
}
} else back = 1;
} else {
if(r) back = -1;
}
return back;
}
/** Retrieve number of cores from /proc/cpuinfo.
@param src Pointer to information source indicator variable.
@return Number of cores found, 1 for default.
*/
static
size_t
dk3cores_from_proc_cpuinfo(int *src)
{
char line[1024]; /* Input text line buffer. */
FILE *fipo = NULL; /* Input file. */
char *pc = NULL; /* Current word pointer. */
char *pn = NULL; /* Next text pointer. */
dk3_sto_t *scores = NULL; /* Storage for found core numbers. */
dk3_sto_it_t *icores = NULL; /* Iterator through core numbers storage. */
unsigned long *ulp = NULL; /* New unsigned long memory. */
unsigned long ul = 0UL; /* Result variable for sscanf(). */
unsigned long maxul = 0UL; /* Maximum core ID found so far. */
int memerr = 0; /* Flag: Memory allocation error occured. */
size_t back = 0;
$? "+ dk3cores_from_proc_cpuinfo"
scores = dk3sto_open_app(NULL);
if(scores) {
dk3sto_set_comp(scores, dk3cores_compare_lu, 0);
icores = dk3sto_it_open(scores);
if(icores) {
fipo = fopen("/proc/cpuinfo", "r");
if(fipo) {
while(fgets(line, sizeof(line), fipo)) {
pc = dk3str_c8_start(line, NULL);
if(pc) {
dk3str_c8_delnl(line); $? ". process \"%!8s\"", line
pn = dk3str_c8_next(pc, NULL);
if(0 == strcmp(pc, "core")) {
pc = pn;
if(pc) {
pn = dk3str_c8_next(pc, NULL);
if(0 == strcmp(pc, "id")) {
pc = pn;
if(pc) {
if(':' == *pc) {
pc++;
#if VERSION_BEFORE_20140716
if(1 == sscanf(pc, "%lu", &ul))
#else
if(0 != dk3ma_ul_from_c8_string(&ul, pc, NULL))
#endif
{ $? ". %lu", ul
if(ul > maxul) { maxul = ul; }
if (NULL != src) { *src = DK3_CORES_SRC_CPUINFO; }
ulp = (unsigned long *)dk3sto_it_find_like(
icores, (void *)(&ul), 0
);
if(NULL == ulp) {
ulp = dk3_new(unsigned long,1);
if(ulp) {
if(!dk3sto_add(scores, (void *)ulp)) {
memerr = 1;
}
} else {
memerr = 1;
}
}
}
}
}
}
}
}
}
}
fclose(fipo);
} else { $? "! fopen"
}
dk3sto_it_reset(icores);
while(NULL != (ulp = (unsigned long *)dk3sto_it_next(icores))) {
back++; $? ". yet another core"
dk3_delete(ulp);
}
dk3sto_it_close(icores);
} else { $? "! icores"
memerr = 1;
}
dk3sto_close(scores);
} else { $? "! scores"
memerr = 1;
}
if(memerr) { $? "! memory error"
if(back < (size_t)(maxul + 1UL)) { $? "! use maxul"
back = (size_t)(maxul + 1UL);
}
}
if(back < 1) { $? "! correction necessary"
back = 1;
} $? "- dk3cores_from_proc_cpuinfo %lu", (unsigned long)back
return back;
}
#endif
size_t
dk3cores_get_num(int *src)
{
size_t back = 1;
int found = DK3_CORES_SRC_NONE;
#if DK3_ON_WINDOWS
SYSTEM_INFO si; /* System information structure. */
LPFN_GETSYSTEMINFO fngetsysteminfo; /* Function address. */
char *ptr; /* Environment variable text. */
unsigned u; /* Core number from environment. */
#elif MACOS || (DK3_HAVE_SYSCTL && defined(CTL_HW) && defined(HW_AVAILCPU) && defined(HW_NCPU))
uint32_t count = 0; /* Number of cores found. */
size_t len = 0; /* Argument length for sysctl(). */
int mib[4]; /* Mib for sysctl(). */
int scres = 0; /* Result from sysctl(). */
#endif
$? "+ dk3cores_get_num"
#if DK3_ON_WINDOWS
if(dk3cores_is_wow64()) { $? ". windows wow6432"
#if DK3_CHAR_SIZE > 1
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleW( L"kernel32" ), "GetNativeSystemInfo"
);
#else
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleA("kernel32"), "GetNativeSystemInfo"
);
#endif
if(NULL != fngetsysteminfo) { $? ". GetNativeSystemInfo"
fngetsysteminfo(&si);
found = DK3_CORES_SRC_SYSTEM;
back = (size_t)(si.dwNumberOfProcessors);
} else { $? "! GetNativeSystemInfo"
#if DK3_CHAR_SIZE > 1
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleW( L"kernel32" ), "GetSystemInfo"
);
#else
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleA("kernel32"), "GetSystemInfo"
);
#endif
if(NULL != fngetsysteminfo) { $? ". GetSystemInfo"
fngetsysteminfo(&si);
found = DK3_CORES_SRC_SYSTEM;
back = (size_t)(si.dwNumberOfProcessors);
} else { $? "! GetSystemInfo"
}
}
} else { $? ". windows native"
#if DK3_CHAR_SIZE > 1
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleW( L"kernel32" ), "GetSystemInfo"
);
#else
fngetsysteminfo = (LPFN_GETSYSTEMINFO)GetProcAddress(
GetModuleHandleA("kernel32"), "GetSystemInfo"
);
#endif
if(NULL != fngetsysteminfo) { $? ". GetSystemInfo"
fngetsysteminfo(&si);
found = DK3_CORES_SRC_SYSTEM;
back = (size_t)(si.dwNumberOfProcessors);
} else { $? "! GetSystemInfo"
}
}
if((DK3_CORES_SRC_NONE == found) || (back < 1)) { $? ". check environment"
ptr = getenv("NUMBER_OF_PROCESSORS");
if(ptr) { $? ". found"
#if VERSION_BEFORE_20140716
if(1 == sscanf(ptr, "%u", &u))
#else
if (0 != dk3ma_ui_from_c8_string(&u, ptr, NULL))
#endif
{ $? ". number"
back = (size_t)u;
found = DK3_CORES_SRC_ENVIRONMENT;
} else { $? "! not numeric"
}
} else { $? "! NUMBER_OF_PROCESSORS"
}
}
#elif DK3_HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
$? ". sysconf (1)"
back = (size_t)sysconf(_SC_NPROCESSORS_ONLN);
found = DK3_CORES_SRC_SYSTEM;
#elif DK3_HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
$? ". sysconf (2)"
back = (size_t)sysconf(_SC_NPROC_ONLN);
found = DK3_CORES_SRC_SYSTEM;
#elif DK3_HAVE_MPCTL && defined(MPC_GETNUMSPUS)
$? ". mpctl (1)"
back = (size_t)mpctl(MPC_GETNUMSPUS, NULL, NULL);
found = DK3_CORES_SRC_SYSTEM;
#elif DK3_HAVE_MPCTL && defined(MPC_GETNUMCPUS)
$? ". mpctl (2)"
back = (size_t)mpctl(MPC_GETNUMCPUS, NULL, NULL);
found = DK3_CORES_SRC_SYSTEM;
#elif MACOS || (DK3_HAVE_SYSCTL && defined(CTL_HW) && defined(HW_AVAILCPU) && defined(HW_NCPU))
$? ". sysctl (hope we are on Mac or BSD here)"
mib[0] = CTL_HW; mib[1] = HW_AVAILCPU; len = sizeof(count);
scres = sysctl(mib, 2, &count, &len, NULL, 0);
if((0 != scres) || (count < 1)) { $? "! HW_AVAILCPU"
mib[0] = CTL_HW; mib[1] = HW_NCPU; len = sizeof(count);
scres = sysctl(mib, 2, &count, &len, NULL, 0);
if((0 == scres) && (count > 0)) { $? ". HW_NCPU"
back = (size_t)count;
found = DK3_CORES_SRC_SYSTEM;
}
} else { $? ". HW_AVAILCPU"
back = (size_t)count;
found = DK3_CORES_SRC_SYSTEM;
}
#endif
#if !DK3_ON_WINDOWS
if((DK3_CORES_SRC_NONE == found)) { $? "! no value found"
back = dk3cores_from_proc_cpuinfo(&found);
}
#endif
if(back < 1) { $? "! correction necessary"
back = 1;
}
if (NULL != src) { *src = found; }
$? "- dk3cores_get_num %lu", (unsigned long)back
return back;
}
size_t
dk3cores_max_threads(dk3_app_t *app, int *src)
{
dkChar line[128]; /* Result buffer for preferences .*/
unsigned long ul; /* Result variable for sscanf(). */
size_t back = 0;
size_t cores = 0; /* Number of cores found. */
size_t x; /* Result variable for sscanf(). */
int found = DK3_CORES_SRC_NONE; /* Information source. */
$? "+ dk3cores_max_threads"
/*
Derive number of threads from number of cores.
*/
cores = back = dk3cores_get_num(&found);
if(back > 2) {
back = back - 1;
}
/*
Check /threads/max preference, attempt to use it.
*/
if(app) {
if(dk3app_get_pref(app,dkT("/threads/max"),line,DK3_SIZEOF(line,dkChar))) {
#if VERSION_BEFORE_20140716
if(1 == dk3sf_sscanf3(line, dkT("%lu"), &ul))
#else
if (0 != dk3ma_ul_from_string(&ul, line, NULL))
#endif
{
x = (size_t)ul;
if(x > back) {
dk3app_log_i1(app, DK3_LL_DEBUG, 365);
}
found = DK3_CORES_SRC_PREFERENCE;
back = x;
} else {
if(0 == dk3str_cmp(dkT("cores"), line)) {
back = cores;
}
}
}
}
/*
Apply corrections if no value was found.
*/
if(back < 1) {
back = 1;
}
if (NULL != src) { *src = found; }
$? "- dk3cores_max_threads"
return back;
}
|