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Fix #1425 - Use physical core count API on FreeBSD

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Similar to Apple, use the native physical core count sysctl, when available.

This is a little repetitive (it's basically the __APPLE__ method plus the
otherBSD method concatenated together) but seemed clearer than any way that
would totally eliminate repetition.

The __FreeBSD_version check only tests the version of the FreeBSD kernel
that zstd is compiled on; importantly, it may be run on a different version.
So the compile-time check is a little naive and needs to be able to fallback
to work on older versions of FreeBSD.  For a similar reason, it may make
sense to simply eliminate the __FreeBSD_version check entirely.  The
tradeoff is that a spurious sysctlbyname would be issued when -T0 is used on
older kernels.
This commit is contained in:
Conrad Meyer 2019-01-04 11:57:12 -08:00
parent b174809fcc
commit fe82637069
1 changed files with 35 additions and 3 deletions
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38
programs/util.c
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@ -640,10 +640,42 @@ failed:
}
}
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#elif defined(__FreeBSD__)
/* Use apple-provided syscall
* see: man 3 sysctl */
#include <sys/param.h>
#include <sys/sysctl.h>
/* Use physical core sysctl when available
* see: man 4 smp, man 3 sysctl */
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0; /* freebsd sysctl is native int sized */
if (numPhysicalCores != 0) return numPhysicalCores;
#if __FreeBSD_version >= 1300008
{ size_t size = sizeof(numPhysicalCores);
int ret = sysctlbyname("kern.smp.cores", &numPhysicalCores, &size, NULL, 0);
if (ret == 0) return numPhysicalCores;
if (errno != ENOENT) {
perror("zstd: can't get number of physical cpus");
exit(1);
}
/* sysctl not present, fall through to older sysconf method */
}
#endif
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
if (numPhysicalCores == -1) {
/* value not queryable, fall back on 1 */
numPhysicalCores = 1;
}
return numPhysicalCores;
}
#elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
/* Use POSIX sysconf
* see: man 3 sysconf */
int UTIL_countPhysicalCores(void)
{
static int numPhysicalCores = 0;