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Editing: hwloc-hello-cpp.cpp

/* Example hwloc API program.
 *
 * See other examples under doc/examples/ in the source tree
 * for more details.
 *
 * Copyright © 2009-2016 Inria.  All rights reserved.
 * Copyright © 2009-2011 Université Bordeaux
 * Copyright © 2009-2010 Cisco Systems, Inc.  All rights reserved.
 * See COPYING in top-level directory.
 *
 * hwloc-hello.c
 */

#include "hwloc.h"

#include <errno.h>
#include <stdio.h>
#include <string.h>

static void print_children(hwloc_topology_t topology, hwloc_obj_t obj,
                           int depth)
{
    char type[32], attr[1024];
    unsigned i;

hwloc_obj_type_snprintf(type, sizeof(type), obj, 0);
    printf("%*s%s", 2*depth, "", type);
    if (obj->os_index != (unsigned) -1)
      printf("#%u", obj->os_index);
    hwloc_obj_attr_snprintf(attr, sizeof(attr), obj, " ", 0);
    if (*attr)
      printf("(%s)", attr);
    printf("\n");
    for (i = 0; i < obj->arity; i++) {
        print_children(topology, obj->children[i], depth + 1);
    }
}

int main(void)
{
    int depth;
    unsigned i, n;
    unsigned long size;
    int levels;
    char string[128];
    int topodepth;
    void *m;
    hwloc_topology_t topology;
    hwloc_cpuset_t cpuset;
    hwloc_obj_t obj;

/* Allocate and initialize topology object. */
    hwloc_topology_init(&topology);

/* ... Optionally, put detection configuration here to ignore
       some objects types, define a synthetic topology, etc....

The default is to detect all the objects of the machine that
       the caller is allowed to access.  See Configure Topology
       Detection. */

/* Perform the topology detection. */
    hwloc_topology_load(topology);

/* Optionally, get some additional topology information
       in case we need the topology depth later. */
    topodepth = hwloc_topology_get_depth(topology);

/*****************************************************************
     * First example:
     * Walk the topology with an array style, from level 0 (always
     * the system level) to the lowest level (always the proc level).
     *****************************************************************/
    for (depth = 0; depth < topodepth; depth++) {
        printf("*** Objects at level %d\n", depth);
        for (i = 0; i < hwloc_get_nbobjs_by_depth(topology, depth);
             i++) {
            hwloc_obj_type_snprintf(string, sizeof(string),
				    hwloc_get_obj_by_depth(topology, depth, i), 0);
            printf("Index %u: %s\n", i, string);
        }
    }

/*****************************************************************
     * Second example:
     * Walk the topology with a tree style.
     *****************************************************************/
    printf("*** Printing overall tree\n");
    print_children(topology, hwloc_get_root_obj(topology), 0);

/*****************************************************************
     * Third example:
     * Print the number of packages.
     *****************************************************************/
    depth = hwloc_get_type_depth(topology, HWLOC_OBJ_PACKAGE);
    if (depth == HWLOC_TYPE_DEPTH_UNKNOWN) {
        printf("*** The number of packages is unknown\n");
    } else {
        printf("*** %u package(s)\n",
               hwloc_get_nbobjs_by_depth(topology, depth));
    }

/*****************************************************************
     * Fourth example:
     * Compute the amount of cache that the first logical processor
     * has above it.
     *****************************************************************/
    levels = 0;
    size = 0;
    for (obj = hwloc_get_obj_by_type(topology, HWLOC_OBJ_PU, 0);
         obj;
         obj = obj->parent)
      if (hwloc_obj_type_is_cache(obj->type)) {
        levels++;
        size += obj->attr->cache.size;
      }
    printf("*** Logical processor 0 has %d caches totaling %luKB\n",
           levels, size / 1024);

/*****************************************************************
     * Fifth example:
     * Bind to only one thread of the last core of the machine.
     *
     * First find out where cores are, or else smaller sets of CPUs if
     * the OS doesn't have the notion of a "core".
     *****************************************************************/
    depth = hwloc_get_type_or_below_depth(topology, HWLOC_OBJ_CORE);

/* Get last core. */
    obj = hwloc_get_obj_by_depth(topology, depth,
                   hwloc_get_nbobjs_by_depth(topology, depth) - 1);
    if (obj) {
        /* Get a copy of its cpuset that we may modify. */
        cpuset = hwloc_bitmap_dup(obj->cpuset);

/* Get only one logical processor (in case the core is
           SMT/hyper-threaded). */
        hwloc_bitmap_singlify(cpuset);

/* And try to bind ourself there. */
        if (hwloc_set_cpubind(topology, cpuset, 0)) {
            char *str;
            int error = errno;
            hwloc_bitmap_asprintf(&str, obj->cpuset);
            printf("Couldn't bind to cpuset %s: %s\n", str, strerror(error));
            free(str);
        }

/* Free our cpuset copy */
        hwloc_bitmap_free(cpuset);
    }

/*****************************************************************
     * Sixth example:
     * Allocate some memory on the last NUMA node, bind some existing
     * memory to the last NUMA node.
     *****************************************************************/
    /* Get last node. There's always at least one. */
    n = hwloc_get_nbobjs_by_type(topology, HWLOC_OBJ_NUMANODE);
    obj = hwloc_get_obj_by_type(topology, HWLOC_OBJ_NUMANODE, n - 1);

size = 1024*1024;
    m = hwloc_alloc_membind(topology, size, obj->nodeset,
                            HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
    hwloc_free(topology, m, size);

m = malloc(size);
    hwloc_set_area_membind(topology, m, size, obj->nodeset,
                           HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
    free(m);

/* Destroy topology object. */
    hwloc_topology_destroy(topology);

return 0;
}

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