unsigned long get_max_node(void)
{
unsigned long max_node = 0;
#if HAVE_NUMA_H
#if !defined(LIBNUMA_API_VERSION) || LIBNUMA_API_VERSION < 2
max_node = NUMA_NUM_NODES;
/*
* NUMA_NUM_NODES is not reliable, libnuma >=2 is looking
* at /proc/self/status to figure out correct number.
* If buffer is not large enough get_mempolicy will fail with EINVAL.
*/
if (max_node < 1024)
max_node = 1024;
#else
max_node = numa_max_possible_node() + 1;
#endif
#endif /* HAVE_NUMA_H */
return max_node;
}
void myhbwmalloc_init(void)
{
/* set to NULL before trying to initialize. if we return before
* successful creation of the mspace, then it will still be NULL,
* and we can use that in subsequent library calls to determine
* that the library failed to initialize. */
myhbwmalloc_mspace = NULL;
/* verbose printout? */
myhbwmalloc_verbose = 0;
{
char * env_char = getenv("HBWMALLOC_VERBOSE");
if (env_char != NULL) {
myhbwmalloc_verbose = 1;
printf("hbwmalloc: HBWMALLOC_VERBOSE set\n");
}
}
/* fail hard or soft? */
myhbwmalloc_hardfail = 1;
{
char * env_char = getenv("HBWMALLOC_SOFTFAIL");
if (env_char != NULL) {
myhbwmalloc_hardfail = 0;
printf("hbwmalloc: HBWMALLOC_SOFTFAIL set\n");
}
}
/* set the atexit handler that will destroy the mspace and free the numa allocation */
atexit(myhbwmalloc_final);
/* detect and configure use of NUMA memory nodes */
{
int max_possible_node = numa_max_possible_node();
int num_possible_nodes = numa_num_possible_nodes();
int max_numa_nodes = numa_max_node();
int num_configured_nodes = numa_num_configured_nodes();
int num_configured_cpus = numa_num_configured_cpus();
if (myhbwmalloc_verbose) {
printf("hbwmalloc: numa_max_possible_node() = %d\n", max_possible_node);
printf("hbwmalloc: numa_num_possible_nodes() = %d\n", num_possible_nodes);
printf("hbwmalloc: numa_max_node() = %d\n", max_numa_nodes);
printf("hbwmalloc: numa_num_configured_nodes() = %d\n", num_configured_nodes);
printf("hbwmalloc: numa_num_configured_cpus() = %d\n", num_configured_cpus);
}
/* FIXME this is a hack. assumes HBW is only numa node 1. */
if (num_configured_nodes <= 2) {
myhbwmalloc_numa_node = num_configured_nodes-1;
} else {
fprintf(stderr,"hbwmalloc: we support only 2 numa nodes, not %d\n", num_configured_nodes);
}
if (myhbwmalloc_verbose) {
for (int i=0; i<num_configured_nodes; i++) {
unsigned max_numa_cpus = numa_num_configured_cpus();
struct bitmask * mask = numa_bitmask_alloc( max_numa_cpus );
int rc = numa_node_to_cpus(i, mask);
if (rc != 0) {
fprintf(stderr, "hbwmalloc: numa_node_to_cpus failed\n");
} else {
printf("hbwmalloc: numa node %d cpu mask:", i);
for (unsigned j=0; j<max_numa_cpus; j++) {
int bit = numa_bitmask_isbitset(mask,j);
printf(" %d", bit);
}
printf("\n");
}
numa_bitmask_free(mask);
}
fflush(stdout);
}
}
#if 0 /* unused */
/* see if the user specifies a slab size */
size_t slab_size_requested = 0;
{
char * env_char = getenv("HBWMALLOC_BYTES");
if (env_char!=NULL) {
long units = 1L;
if ( NULL != strstr(env_char,"G") ) units = 1000000000L;
else if ( NULL != strstr(env_char,"M") ) units = 1000000L;
else if ( NULL != strstr(env_char,"K") ) units = 1000L;
else units = 1L;
int num_count = strspn(env_char, "0123456789");
memset( &env_char[num_count], ' ', strlen(env_char)-num_count);
slab_size_requested = units * atol(env_char);
}
if (myhbwmalloc_verbose) {
printf("hbwmalloc: requested slab_size_requested = %zu\n", slab_size_requested);
}
}
#endif
/* see what libnuma says is available */
size_t myhbwmalloc_slab_size;
{
int node = myhbwmalloc_numa_node;
long long freemem;
long long maxmem = numa_node_size64(node, &freemem);
if (myhbwmalloc_verbose) {
printf("hbwmalloc: numa_node_size64 says maxmem=%lld freemem=%lld for numa node %d\n",
maxmem, freemem, node);
}
myhbwmalloc_slab_size = freemem;
}
/* assume threads, disable if MPI knows otherwise, then allow user to override. */
int multithreaded = 1;
#ifdef HAVE_MPI
int nprocs;
{
int is_init, is_final;
MPI_Initialized(&is_init);
MPI_Finalized(&is_final);
if (is_init && !is_final) {
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
}
/* give equal portion to every MPI process */
myhbwmalloc_slab_size /= nprocs;
/* if the user initializes MPI with MPI_Init or
* MPI_Init_thread(MPI_THREAD_SINGLE), they assert there
* are no threads at all, which means we can skip the
* malloc mspace lock.
*
* if the user lies to MPI, they deserve any bad thing
* that comes of it. */
int provided;
MPI_Query_thread(&provided);
if (provided==MPI_THREAD_SINGLE) {
multithreaded = 0;
} else {
multithreaded = 1;
}
if (myhbwmalloc_verbose) {
printf("hbwmalloc: MPI processes = %d (threaded = %d)\n", nprocs, multithreaded);
printf("hbwmalloc: myhbwmalloc_slab_size = %d\n", myhbwmalloc_slab_size);
}
}
#endif
/* user can assert that hbwmalloc and friends need not be thread-safe */
{
char * env_char = getenv("HBWMALLOC_LOCKLESS");
if (env_char != NULL) {
multithreaded = 0;
if (myhbwmalloc_verbose) {
printf("hbwmalloc: user has disabled locking in mspaces by setting HBWMALLOC_LOCKLESS\n");
}
}
}
myhbwmalloc_slab = numa_alloc_onnode( myhbwmalloc_slab_size, myhbwmalloc_numa_node);
if (myhbwmalloc_slab==NULL) {
fprintf(stderr, "hbwmalloc: numa_alloc_onnode returned NULL for size = %zu\n", myhbwmalloc_slab_size);
return;
} else {
if (myhbwmalloc_verbose) {
printf("hbwmalloc: numa_alloc_onnode succeeded for size %zu\n", myhbwmalloc_slab_size);
}
/* part (less than 128*sizeof(size_t) bytes) of this space is used for bookkeeping,
* so the capacity must be at least this large */
if (myhbwmalloc_slab_size < 128*sizeof(size_t)) {
fprintf(stderr, "hbwmalloc: not enough space for mspace bookkeeping\n");
return;
}
/* see above regarding if the user lies to MPI. */
int locked = multithreaded;
myhbwmalloc_mspace = create_mspace_with_base( myhbwmalloc_slab, myhbwmalloc_slab_size, locked);
if (myhbwmalloc_mspace == NULL) {
fprintf(stderr, "hbwmalloc: create_mspace_with_base returned NULL\n");
return;
} else if (myhbwmalloc_verbose) {
printf("hbwmalloc: create_mspace_with_base succeeded for size %zu\n", myhbwmalloc_slab_size);
}
}
}
