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- This comparison shows the changes necessary to convert path
/openrisc/tags/gnu-dev/fsf-gcc-snapshot-1-mar-12/or1k-gcc/libgomp/config/bsd
- from Rev 735 to Rev 783
- ↔ Reverse comparison
Rev 735 → Rev 783
/proc.c
0,0 → 1,114
/* Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc. |
Contributed by Richard Henderson <rth@redhat.com>. |
|
This file is part of the GNU OpenMP Library (libgomp). |
|
Libgomp is free software; you can redistribute it and/or modify it |
under the terms of the GNU General Public License as published by |
the Free Software Foundation; either version 3, or (at your option) |
any later version. |
|
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY |
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
more details. |
|
Under Section 7 of GPL version 3, you are granted additional |
permissions described in the GCC Runtime Library Exception, version |
3.1, as published by the Free Software Foundation. |
|
You should have received a copy of the GNU General Public License and |
a copy of the GCC Runtime Library Exception along with this program; |
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
<http://www.gnu.org/licenses/>. */ |
|
/* This file contains system specific routines related to counting |
online processors and dynamic load balancing. It is expected that |
a system may well want to write special versions of each of these. |
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The following implementation uses a mix of POSIX and BSD routines. */ |
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#include "libgomp.h" |
#include <unistd.h> |
#include <stdlib.h> |
#ifdef HAVE_GETLOADAVG |
# ifdef HAVE_SYS_LOADAVG_H |
# include <sys/loadavg.h> |
# endif |
#endif |
#ifdef HAVE_SYS_SYSCTL_H |
# include <sys/sysctl.h> |
#endif |
|
static int |
get_num_procs (void) |
{ |
#ifdef _SC_NPROCESSORS_ONLN |
return sysconf (_SC_NPROCESSORS_ONLN); |
#elif defined HW_NCPU |
int ncpus = 1; |
size_t len = sizeof(ncpus); |
sysctl((int[2]) {CTL_HW, HW_NCPU}, 2, &ncpus, &len, NULL, 0); |
return ncpus; |
#else |
return 0; |
#endif |
} |
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/* At startup, determine the default number of threads. It would seem |
this should be related to the number of cpus online. */ |
|
void |
gomp_init_num_threads (void) |
{ |
int ncpus = get_num_procs (); |
|
if (ncpus > 0) |
gomp_global_icv.nthreads_var = ncpus; |
} |
|
/* When OMP_DYNAMIC is set, at thread launch determine the number of |
threads we should spawn for this team. */ |
/* ??? I have no idea what best practice for this is. Surely some |
function of the number of processors that are *still* online and |
the load average. Here I use the number of processors online |
minus the 15 minute load average. */ |
|
unsigned |
gomp_dynamic_max_threads (void) |
{ |
unsigned n_onln, loadavg; |
unsigned nthreads_var = gomp_icv (false)->nthreads_var; |
|
n_onln = get_num_procs (); |
if (!n_onln || n_onln > nthreads_var) |
n_onln = nthreads_var; |
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loadavg = 0; |
#ifdef HAVE_GETLOADAVG |
{ |
double dloadavg[3]; |
if (getloadavg (dloadavg, 3) == 3) |
{ |
/* Add 0.1 to get a kind of biased rounding. */ |
loadavg = dloadavg[2] + 0.1; |
} |
} |
#endif |
|
if (loadavg >= n_onln) |
return 1; |
else |
return n_onln - loadavg; |
} |
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int |
omp_get_num_procs (void) |
{ |
int ncpus = get_num_procs (); |
if (ncpus <= 0) |
ncpus = gomp_icv (false)->nthreads_var; |
return ncpus; |
} |
|
ialias (omp_get_num_procs) |