"Whether SMPI_SHARED_MALLOC is enabled. Disable it for debugging purposes.");
xbt_cfg_register_alias("smpi/shared-malloc", "smpi/use-shared-malloc");
xbt_cfg_register_alias("smpi/shared-malloc", "smpi/use_shared_malloc");
+ xbt_cfg_register_double("smpi/shared-malloc-blocksize", 1UL << 20, nullptr, "Size of the bogus file which will be created for global shared allocations");
xbt_cfg_register_double("smpi/cpu-threshold", 1e-6, nullptr, "Minimal computation time (in seconds) not discarded, or -1 for infinity.");
xbt_cfg_register_alias("smpi/cpu-threshold", "smpi/cpu_threshold");
if (smpi_shared_malloc_bogusfile == -1) {
/* Create a fd to a new file on disk, make it smpi_shared_malloc_blocksize big, and unlink it.
* It still exists in memory but not in the file system (thus it cannot be leaked). */
+ smpi_shared_malloc_blocksize = static_cast<unsigned long>(xbt_cfg_get_double("smpi/shared-malloc-blocksize"));
+ XBT_DEBUG("global shared allocation. Blocksize %lu", smpi_shared_malloc_blocksize);
char* name = xbt_strdup("/tmp/simgrid-shmalloc-XXXXXX");
smpi_shared_malloc_bogusfile = mkstemp(name);
unlink(name);
void* res = mmap(pos, smpi_shared_malloc_blocksize, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED | MAP_POPULATE,
smpi_shared_malloc_bogusfile, 0);
xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
- "STARPU_MALLOC_SIMULATION_FOLD environment variable or the sysctl vm.max_map_count?",
+ "size of the mapped file using --cfg=smpi/shared-malloc-blocksize=newvalue (default 1048576) ?",
+ "You can also try using the sysctl vm.max_map_count",
strerror(errno));
}
if (size % smpi_shared_malloc_blocksize) {
void* res = mmap(pos, size % smpi_shared_malloc_blocksize, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED | MAP_POPULATE, smpi_shared_malloc_bogusfile, 0);
xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
- "STARPU_MALLOC_SIMULATION_FOLD environment variable or the sysctl vm.max_map_count?",
+ "size of the mapped file using --cfg=smpi/shared-malloc-blocksize=newvalue (default 1048576) ?",
+ "You can also try using the sysctl vm.max_map_count",
strerror(errno));
}