SWAMPy

✎ CARVE FLESH

EDITING: sharedcaches.c

/* This example program looks for caches shared between this process
 * and another one based on their current binding.
 *
 * Copyright © 2014-2018 Inria.  All rights reserved.
 * See COPYING in top-level directory.
 */

#include "hwloc.h"

#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

int main(int argc, char *argv[])
{
  pid_t hispid;
  hwloc_topology_t topology;
  hwloc_bitmap_t set, hisset;
  hwloc_obj_t obj;
  int err;

/* find the pid of the other process, otherwise use my own pid */
  if (argc >= 2) {
    hispid = atoi(argv[1]);
  } else {
    hispid = getpid();
  }

/* create a topology with instruction caches enables */
  err = hwloc_topology_init(&topology);
  if (err < 0) {
    fprintf(stderr, "failed to initialize the topology\n");
    return EXIT_FAILURE;
  }
  hwloc_topology_set_icache_types_filter(topology, HWLOC_TYPE_FILTER_KEEP_ALL);
  err = hwloc_topology_load(topology);
  if (err < 0) {
    fprintf(stderr, "failed to load the topology\n");
    hwloc_topology_destroy(topology);
    return EXIT_FAILURE;
  }

/* find where I am running */
  set = hwloc_bitmap_alloc();
  if (!set) {
    fprintf(stderr, "failed to allocate my bitmap\n");
    hwloc_topology_destroy(topology);
    return EXIT_FAILURE;
  }
  err = hwloc_get_cpubind(topology, set, 0);
  if (err < 0) {
    fprintf(stderr, "failed to get my binding\n");
    hwloc_bitmap_free(set);
    hwloc_topology_destroy(topology);
    return EXIT_FAILURE;
  }

/* find where the other process is running */
  hisset = hwloc_bitmap_alloc();
  if (!hisset) {
    fprintf(stderr, "failed to allocate his bitmap\n");
    hwloc_bitmap_free(set);
    hwloc_topology_destroy(topology);
    return EXIT_FAILURE;
  }
  /* FIXME: on windows, hispid should be replaced with OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, hispid); */
  err = hwloc_get_proc_cpubind(topology, hispid, hisset, 0);
  if (err < 0) {
    fprintf(stderr, "failed to get his binding\n");
    hwloc_bitmap_free(hisset);
    hwloc_bitmap_free(set);
    hwloc_topology_destroy(topology);
    return EXIT_FAILURE;
  }

/* merge both process binding into mine */
  hwloc_bitmap_or(set, set, hisset);

/* find the smallest object covering this set */
  obj = hwloc_get_obj_covering_cpuset(topology, set);

/* display parents of type cache */
  while (obj) {
    if (hwloc_obj_type_is_cache(obj->type)) {
      char type[64];
      char attr[64];
      hwloc_obj_type_snprintf(type, sizeof(type), obj, 0);
      hwloc_obj_attr_snprintf(attr, sizeof(attr), obj, ", ", 0);
      printf("Found object %s with attributes %s\n", type, attr);
    }
    /* next parent up in the tree */
    obj = obj->parent;
  }

hwloc_bitmap_free(hisset);
  hwloc_bitmap_free(set);
  hwloc_topology_destroy(topology);
  return EXIT_SUCCESS;
}

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📄 cpuset+bitmap+cpubind.c	C	5.1 KB	2020-11-23 14:37	EDIT
📄 get-knl-modes.c	C	908 B	2020-11-23 14:37	EDIT
📄 gpu.c	C	3.2 KB	2020-11-23 14:37	EDIT
📄 hwloc-hello-cpp.cpp	CPP	5.9 KB	2020-11-23 14:38	EDIT
📄 hwloc-hello.c	C	5.9 KB	2020-11-23 14:37	EDIT
📄 Makefile.am	AM	832 B	2020-11-23 14:37	EDIT
📄 Makefile.in	IN	42.3 KB	2021-02-11 08:47	EDIT
📄 Makefile_x86_64	?	41.2 KB	2025-12-22 08:14	EDIT
📄 nodeset+membind+policy.c	C	4.9 KB	2020-11-23 14:37	EDIT
📄 sharedcaches.c	C	2.8 KB	2020-11-23 14:37	EDIT