-/* Copyright (c) 2007-2019. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_shared, smpi, "Logging specific to SMPI (shared memory macros)");
-#define PTR_STRLEN (2 + 2 * sizeof(void*) + 1)
-
namespace{
/** Some location in the source code
*
calls.clear();
}
-static size_t shm_size(int fd) {
- struct stat st;
-
- if(fstat(fd, &st) < 0) {
- xbt_die("Could not stat fd %d: %s", fd, strerror(errno));
- }
- return static_cast<size_t>(st.st_size);
-}
-
#ifndef WIN32
-static void* shm_map(int fd, size_t size, shared_data_key_type* data) {
- char loc[PTR_STRLEN];
+static void* shm_map(int fd, size_t size, shared_data_key_type* data)
+{
+ void* mem = smpi_temp_shm_mmap(fd, size);
shared_metadata_t meta;
-
- if(size > shm_size(fd) && (ftruncate(fd, static_cast<off_t>(size)) < 0)) {
- xbt_die("Could not truncate fd %d to %zu: %s", fd, size, strerror(errno));
- }
-
- void* mem = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
- if(mem == MAP_FAILED) {
- xbt_die("Failed to map fd %d with size %zu: %s\n"
- "If you are running a lot of ranks, you may be exceeding the amount of mappings allowed per process.\n"
- "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n"
- "Please see "
- "https://simgrid.org/doc/latest/Configuring_SimGrid.html#configuring-the-user-code-virtualization for more "
- "information.",
- fd, size, strerror(errno));
- }
- snprintf(loc, PTR_STRLEN, "%p", mem);
meta.size = size;
meta.data = data;
meta.allocated_ptr = mem;
auto data = res.first;
if (res.second) {
// The new element was inserted.
- // Generate a shared memory name from the address of the shared_data:
- char shmname[32]; // cannot be longer than PSHMNAMLEN = 31 on macOS (shm_open raises ENAMETOOLONG otherwise)
- snprintf(shmname, 31, "/shmalloc%p", &*data);
- int fd = shm_open(shmname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
- if (fd < 0) {
- if (errno == EEXIST)
- xbt_die("Please cleanup /dev/shm/%s", shmname);
- else
- xbt_die("An unhandled error occurred while opening %s. shm_open: %s", shmname, strerror(errno));
- }
- data->second.fd = fd;
+ int fd = smpi_temp_shm_get();
+ data->second.fd = fd;
data->second.count = 1;
mem = shm_map(fd, size, &*data);
- if (shm_unlink(shmname) < 0) {
- XBT_WARN("Could not early unlink %s. shm_unlink: %s", shmname, strerror(errno));
- }
- XBT_DEBUG("Mapping %s at %p through %d", shmname, mem, fd);
} else {
mem = shm_map(data->second.fd, size, &*data);
data->second.count++;
}
- XBT_DEBUG("Shared malloc %zu in %p (metadata at %p)", size, mem, &*data);
+ XBT_DEBUG("Shared malloc %zu in %p through %d (metadata at %p)", size, mem, data->second.fd, &*data);
return mem;
}
smpi_shared_malloc_bogusfile = mkstemp(name);
XBT_DEBUG("bogusfile : %s\n", name);
unlink(name);
- char* dumb = new char[smpi_shared_malloc_blocksize](); // zero initialized
+ const char* dumb = new char[smpi_shared_malloc_blocksize](); // zero initialized
ssize_t err = write(smpi_shared_malloc_bogusfile, dumb, smpi_shared_malloc_blocksize);
if(err<0)
xbt_die("Could not write bogus file for shared malloc");
for (size_t offset = start_block_offset; offset < stop_block_offset; offset += smpi_shared_malloc_blocksize) {
XBT_DEBUG("\t\tglobal shared allocation, mmap block offset %zx", offset);
void* pos = (void*)((unsigned long)mem + offset);
- void* res = mmap(pos, smpi_shared_malloc_blocksize, PROT_READ | PROT_WRITE, mmap_flag,
- huge_fd, 0);
+ const void* res = mmap(pos, smpi_shared_malloc_blocksize, PROT_READ | PROT_WRITE, mmap_flag, huge_fd, 0);
xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
"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. "
if(low_page_start_offset < low_page_stop_offset) {
XBT_DEBUG("\t\tglobal shared allocation, mmap block start");
void* pos = (void*)((unsigned long)mem + low_page_start_offset);
- void* res = mmap(pos, low_page_stop_offset-low_page_start_offset, PROT_READ | PROT_WRITE, mmap_base_flag, // not a full huge page
- smpi_shared_malloc_bogusfile, 0);
+ const void* res = mmap(pos, low_page_stop_offset - low_page_start_offset, PROT_READ | PROT_WRITE,
+ mmap_base_flag, // not a full huge page
+ smpi_shared_malloc_bogusfile, 0);
xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
"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",
size_t high_page_stop_offset = stop_offset == size ? size : ALIGN_DOWN((int64_t)stop_offset, PAGE_SIZE);
if(high_page_stop_offset > stop_block_offset) {
void* pos = (void*)((unsigned long)mem + stop_block_offset);
- void* res = mmap(pos, high_page_stop_offset-stop_block_offset, PROT_READ | PROT_WRITE, mmap_base_flag, // not a full huge page
- smpi_shared_malloc_bogusfile, 0);
+ const void* res = mmap(pos, high_page_stop_offset - stop_block_offset, PROT_READ | PROT_WRITE,
+ mmap_base_flag, // not a full huge page
+ smpi_shared_malloc_bogusfile, 0);
xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
"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",
return mem;
}
-
-void *smpi_shared_malloc_intercept(size_t size, const char *file, int line) {
- if( simgrid::config::get_value<double>("smpi/auto-shared-malloc-thresh") == 0 || size < simgrid::config::get_value<double>("smpi/auto-shared-malloc-thresh"))
+void* smpi_shared_malloc_intercept(size_t size, const char* file, int line)
+{
+ if( smpi_cfg_auto_shared_malloc_thresh() == 0 || size < smpi_cfg_auto_shared_malloc_thresh())
return ::operator new(size);
else
return smpi_shared_malloc(size, file, line);
}
-void* smpi_shared_calloc_intercept(size_t num_elm, size_t elem_size, const char* file, int line){
- if( simgrid::config::get_value<double>("smpi/auto-shared-malloc-thresh") == 0 || elem_size*num_elm < simgrid::config::get_value<double>("smpi/auto-shared-malloc-thresh")){
+void* smpi_shared_calloc_intercept(size_t num_elm, size_t elem_size, const char* file, int line)
+{
+ if( smpi_cfg_auto_shared_malloc_thresh() == 0 || elem_size*num_elm < smpi_cfg_auto_shared_malloc_thresh()){
void* ptr = ::operator new(elem_size*num_elm);
memset(ptr, 0, elem_size*num_elm);
return ptr;
} else
return smpi_shared_malloc(elem_size*num_elm, file, line);
-
}
-void *smpi_shared_malloc(size_t size, const char *file, int line) {
- if (size > 0 && smpi_cfg_shared_malloc == SharedMallocType::LOCAL) {
+void* smpi_shared_malloc(size_t size, const char* file, int line)
+{
+ if (size > 0 && smpi_cfg_shared_malloc() == SharedMallocType::LOCAL) {
return smpi_shared_malloc_local(size, file, line);
- } else if (smpi_cfg_shared_malloc == SharedMallocType::GLOBAL) {
+ } else if (smpi_cfg_shared_malloc() == SharedMallocType::GLOBAL) {
int nb_shared_blocks = 1;
size_t shared_block_offsets[2] = {0, size};
return smpi_shared_malloc_partial(size, shared_block_offsets, nb_shared_blocks);
private_blocks.clear(); // being paranoid
if (allocs_metadata.empty())
return 0;
- if (smpi_cfg_shared_malloc == SharedMallocType::LOCAL || smpi_cfg_shared_malloc == SharedMallocType::GLOBAL) {
+ if (smpi_cfg_shared_malloc() == SharedMallocType::LOCAL || smpi_cfg_shared_malloc() == SharedMallocType::GLOBAL) {
auto low = allocs_metadata.lower_bound(ptr);
if (low != allocs_metadata.end() && low->first == ptr) {
private_blocks = low->second.private_blocks;
void smpi_shared_free(void *ptr)
{
- if (smpi_cfg_shared_malloc == SharedMallocType::LOCAL) {
- char loc[PTR_STRLEN];
- snprintf(loc, PTR_STRLEN, "%p", ptr);
+ if (smpi_cfg_shared_malloc() == SharedMallocType::LOCAL) {
auto meta = allocs_metadata.find(ptr);
if (meta == allocs_metadata.end()) {
::operator delete(ptr);
XBT_DEBUG("Shared free - Local - no removal - of %p, count = %d", ptr, data->count);
}
- } else if (smpi_cfg_shared_malloc == SharedMallocType::GLOBAL) {
+ } else if (smpi_cfg_shared_malloc() == SharedMallocType::GLOBAL) {
auto meta = allocs_metadata.find(ptr);
if (meta != allocs_metadata.end()){
meta->second.data->second.count--;
