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Kokkos_CPUDiscovery.cpp
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Wed, Jul 17, 18:04

Kokkos_CPUDiscovery.cpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <unistd.h>
#endif
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cerrno>
namespace Kokkos {
namespace Impl {
//The following function (processors_per_node) is copied from here:
// https://lists.gnu.org/archive/html/autoconf/2002-08/msg00126.html
// Philip Willoughby
int processors_per_node() {
int nprocs = -1;
int nprocs_max = -1;
#ifdef _WIN32
#ifndef _SC_NPROCESSORS_ONLN
SYSTEM_INFO info;
GetSystemInfo(&info);
#define sysconf(a) info.dwNumberOfProcessors
#define _SC_NPROCESSORS_ONLN
#endif
#endif
#ifdef _SC_NPROCESSORS_ONLN
nprocs = sysconf(_SC_NPROCESSORS_ONLN);
if (nprocs < 1)
{
return -1;
}
nprocs_max = sysconf(_SC_NPROCESSORS_CONF);
if (nprocs_max < 1)
{
return -1;
}
return nprocs;
#else
return -1;
#endif
}
int mpi_ranks_per_node() {
char *str;
int ppn = 1;
//if ((str = getenv("SLURM_TASKS_PER_NODE"))) {
// ppn = atoi(str);
// if(ppn<=0) ppn = 1;
//}
if ((str = getenv("MV2_COMM_WORLD_LOCAL_SIZE"))) {
ppn = atoi(str);
if(ppn<=0) ppn = 1;
}
if ((str = getenv("OMPI_COMM_WORLD_LOCAL_SIZE"))) {
ppn = atoi(str);
if(ppn<=0) ppn = 1;
}
return ppn;
}
int mpi_local_rank_on_node() {
char *str;
int local_rank=0;
//if ((str = getenv("SLURM_LOCALID"))) {
// local_rank = atoi(str);
//}
if ((str = getenv("MV2_COMM_WORLD_LOCAL_RANK"))) {
local_rank = atoi(str);
}
if ((str = getenv("OMPI_COMM_WORLD_LOCAL_RANK"))) {
local_rank = atoi(str);
}
return local_rank;
}
}
}

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