himembind.cpp

//   Copyright 2019 <Huawei Technologies Co., Ltd>
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

#ifdef _MSC_VER
#     include <process.h>
#     define execvp _execvp
#else
#     include <unistd.h>
#endif  // _MSC_VER
#include <hwloc.h>
#include <stdio.h>
#include <stdlib.h>

#include <memory>

int main(int argc, char** argv)
{
     int ret = 0;

     const char* myname = argv[0];
     ++argv;
     --argc;

     const char* callname = argv[0];

     hwloc_topology_t topology;
     unsigned long flags = 0;

     hwloc_topology_init(&topology);
     hwloc_topology_set_flags(topology, flags);
     hwloc_topology_load(topology);

     hwloc_cpuset_t cpuset = hwloc_bitmap_alloc();
     hwloc_get_cpubind(topology, cpuset, HWLOC_CPUBIND_PROCESS);

     char* ss = nullptr;
     hwloc_bitmap_asprintf(&ss, cpuset);
     fprintf(stderr, "cpuset: %s\n", ss);
     free(ss);
     ss = nullptr;

     char* ss1 = nullptr;
     hwloc_nodeset_t nodeset = hwloc_bitmap_alloc();
     hwloc_cpuset_to_nodeset(topology, cpuset, nodeset);
     hwloc_bitmap_asprintf(&ss1, nodeset);
     fprintf(stderr, "nodeset: %s\n", ss1);
     free(ss1);
     ss1 = nullptr;

     ret = hwloc_set_membind_nodeset(topology, nodeset, HWLOC_MEMBIND_BIND,
                                     HWLOC_MEMBIND_STRICT);
     if (ret) {
          fprintf(stderr, "%s: Failed to set membind policy\n", myname);
          goto exit_failure;
     }

     if (argc == 0) {
          fprintf(stderr, "Usage: %s <cmd>\n", myname);
          goto exit_failure;
     }

     ret = execvp(callname, argv);
     if (ret) {
          fprintf(stderr, "%s: Failed to launch executable \"%s\"\n", callname,
                  argv[0]);
          perror("execvp");
          goto exit_failure;
     }

exit_failure:
     hwloc_bitmap_free(cpuset);
     hwloc_bitmap_free(nodeset);
     hwloc_topology_destroy(topology);
     return EXIT_FAILURE;
}