#include <cfloat> /* DBL_MAX */
#include <dlfcn.h>
#include <fcntl.h>
+#include <link.h>
#include <fstream>
#if HAVE_SENDFILE
int smpi_universe_size = 0;
extern double smpi_total_benched_time;
xbt_os_timer_t global_timer;
+static char* privatize_lib_path=nullptr;
/**
* Setting MPI_COMM_WORLD to MPI_COMM_UNINITIALIZED (it's a variable)
* is important because the implementation of MPI_Comm checks
return 0;
}
+
// TODO, remove the number of functions involved here
static smpi_entry_point_type smpi_resolve_function(void* handle)
{
return smpi_entry_point_type();
}
+static void smpi_copy_file(std::string src,std::string target, off_t fdin_size, int rank){
+
+ int fdin = open(src.c_str(), O_RDONLY);
+ xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.",
+ src.c_str());
+ int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
+ xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
+
+ XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target.c_str());
+#if HAVE_SENDFILE
+ ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
+ xbt_assert(sent_size == fdin_size,
+ "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
+ target.c_str(), sent_size, fdin_size, errno, strerror(errno));
+#else
+ const int bufsize = 1024 * 1024 * 4;
+ char buf[bufsize];
+ while (int got = read(fdin, buf, bufsize)) {
+ if (got == -1) {
+ xbt_assert(errno == EINTR, "Cannot read from %s", src.c_str());
+ } else {
+ char* p = buf;
+ int todo = got;
+ while (int done = write(fdout, p, todo)) {
+ if (done == -1) {
+ xbt_assert(errno == EINTR, "Cannot write into %s", target.c_str());
+ } else {
+ p += done;
+ todo -= done;
+ }
+ }
+ }
+ }
+#endif
+ close(fdin);
+ close(fdout);
+}
+
+static int visit_libs (struct dl_phdr_info *info,
+ size_t size, void *data){
+ char* libname = (char*)(data);
+ const char *path = info->dlpi_name;
+ if(strstr(path, libname)){
+ strncpy(libname, path, 512);
+ return 1;
+ }
+
+ return 0;
+}
+
int smpi_main(const char* executable, int argc, char *argv[])
{
srand(SMPI_RAND_SEED);
stat(executable_copy.c_str(), &fdin_stat);
off_t fdin_size = fdin_stat.st_size;
static std::size_t rank = 0;
-
+
+
+ std::string libname = simgrid::config::get_value<std::string>("smpi/privatize-lib");
+ std::string target_lib;
+ if(not libname.empty()){
+ //load the library once to add it to the local libs, to get the absolute path
+ void* libhandle = dlopen(libname.c_str(), RTLD_LAZY);
+ //get library name from path
+ char fullpath[512]={'\0'};
+ strcpy(fullpath, libname.c_str());
+ int ret = dl_iterate_phdr(visit_libs, fullpath);
+ if(ret==0)
+ xbt_die("Can't find a linked %s - check the setting you gave to smpi/privatize-lib", fullpath);
+ else
+ XBT_DEBUG("Extra lib to privatize found : %s", fullpath);
+ privatize_lib_path=strdup(fullpath);
+ dlclose(libhandle);
+ }
+
simix_global->default_function = [executable_copy, fdin_size](std::vector<std::string> args) {
return std::function<void()>([executable_copy, fdin_size, args] {
// Copy the dynamic library:
std::string target_executable = executable_copy
+ "_" + std::to_string(getpid())
- + "_" + std::to_string(rank++) + ".so";
-
- int fdin = open(executable_copy.c_str(), O_RDONLY);
- xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.",
- executable_copy.c_str());
- int fdout = open(target_executable.c_str(), O_CREAT | O_RDWR, S_IRWXU);
- xbt_assert(fdout >= 0, "Cannot write into %s", target_executable.c_str());
-
- XBT_DEBUG("Copy %ld bytes into %s", static_cast<long>(fdin_size), target_executable.c_str());
-#if HAVE_SENDFILE
- ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
- xbt_assert(sent_size == fdin_size,
- "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
- target_executable.c_str(), sent_size, fdin_size, errno, strerror(errno));
-#else
- const int bufsize = 1024 * 1024 * 4;
- char buf[bufsize];
- while (int got = read(fdin, buf, bufsize)) {
- if (got == -1) {
- xbt_assert(errno == EINTR, "Cannot read from %s", executable_copy.c_str());
- } else {
- char* p = buf;
- int todo = got;
- while (int done = write(fdout, p, todo)) {
- if (done == -1) {
- xbt_assert(errno == EINTR, "Cannot write into %s", target_executable.c_str());
- } else {
- p += done;
- todo -= done;
- }
- }
- }
+ + "_" + std::to_string(rank) + ".so";
+
+ smpi_copy_file(executable_copy, target_executable, fdin_size, rank);
+
+ //if smpi/privatize-lib is set, duplicate pointed lib and link each executable to a different one.
+ //TODO : extend to multiple libs
+ std::string libname = simgrid::config::get_value<std::string>("smpi/privatize-lib");
+ //if we were given a full path, strip it
+ size_t index = libname.find_last_of("/\\");
+ if(index!=std::string::npos)
+ libname=libname.substr(index+1);
+ std::string target_lib;
+ if(not libname.empty()){
+ //load the library to add it to the local libs, to get the absolute path
+ struct stat fdin_stat2;
+ stat(privatize_lib_path, &fdin_stat2);
+ off_t fdin_size2 = fdin_stat2.st_size;
+
+ // Copy the dynamic library, the new name must be the same length as the old one
+ // just replace the name with 0s and the rank.
+ target_lib = std::string(libname.length() - std::to_string(rank).length(), '0')+std::to_string(rank);
+ XBT_DEBUG("copy lib %s to %s, with size %zd", privatize_lib_path, target_lib.c_str(), fdin_size2);
+ smpi_copy_file(privatize_lib_path, target_lib, fdin_size2, rank);
+
+ std::string sedcommand = "sed -i -e 's/"+libname+"/"+target_lib+"/g' "+target_executable;
+ int ret = system(sedcommand.c_str());
+ if(ret!=0) xbt_die ("error while applying sed command %s \n", sedcommand.c_str());
}
-#endif
- close(fdin);
- close(fdout);
-
+ rank++;
// Load the copy and resolve the entry point:
void* handle = dlopen(target_executable.c_str(), RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
int saved_errno = errno;
- if (simgrid::config::get_value<bool>("smpi/keep-temps") == false)
+ if (simgrid::config::get_value<bool>("smpi/keep-temps") == false){
unlink(target_executable.c_str());
+ if(not target_lib.empty())
+ unlink(target_lib.c_str());
+ }
if (handle == nullptr)
xbt_die("dlopen failed: %s (errno: %d -- %s)", dlerror(), saved_errno, strerror(saved_errno));
smpi_entry_point_type entry_point = smpi_resolve_function(handle);
if (not entry_point)
xbt_die("Could not resolve entry point");
-
smpi_run_entry_point(entry_point, args);
});
};
