X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/e95b24778ea4ccdf7a9ccb3c40bd383bd0af1c45..ffe8ce65fd9a8e18a0469f26f067c3ea6d5d60d4:/src/smpi/smpi_bench.c

diff --git a/src/smpi/smpi_bench.c b/src/smpi/smpi_bench.c
index 55970de52b..7507e90939 100644
--- a/src/smpi/smpi_bench.c
+++ b/src/smpi/smpi_bench.c
@@ -195,7 +195,7 @@ void smpi_bench_begin(void)
 {
   smpi_switch_data_segment(smpi_process_index());
 
-  if(MC_is_active())
+  if (MC_is_active() || MC_record_replay_is_active())
     return;
 
   xbt_os_threadtimer_start(smpi_process_timer());
@@ -204,7 +204,7 @@ void smpi_bench_begin(void)
 void smpi_bench_end(void)
 {
 
-  if(MC_is_active())
+  if (MC_is_active() || MC_record_replay_is_active())
     return;
 
   xbt_os_timer_t timer = smpi_process_timer();
@@ -638,6 +638,7 @@ void smpi_really_switch_data_segment(int dest) {
     }
   }
 
+  // FIXME, cross-process support (mmap across process when necessary)
   int current = smpi_privatisation_regions[dest].file_descriptor;
   XBT_DEBUG("Switching data frame to the one of process %d", dest);
   void* tmp = mmap (TOPAGE(start_data_exe), size_data_exe, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, current, 0);
@@ -753,8 +754,25 @@ void smpi_initialize_global_memory_segments(){
       int status;
 
       int file_descriptor= mkstemp (path);
-      if (file_descriptor < 0)
-        xbt_die("Impossible to create temporary file for memory mapping");
+      if (file_descriptor < 0) {
+    	  if (errno==EMFILE) {
+    		  xbt_die("Impossible to create temporary file for memory mapping: %s\n\
+The open() system call failed with the EMFILE error code (too many files). \n\n\
+This means that you reached the system limits concerning the amount of files per process. \
+This is not a surprise if you are trying to virtualize many processes on top of SMPI. \
+Don't panic -- you should simply increase your system limits and try again. \n\n\
+First, check what your limits are:\n\
+  cat /proc/sys/fs/file-max # Gives you the system-wide limit\n\
+  ulimit -Hn                # Gives you the per process hard limit\n\
+  ulimit -Sn                # Gives you the per process soft limit\n\
+  cat /proc/self/limits     # Displays any per-process limitation (including the one given above)\n\n\
+If one of these values is less than the amount of MPI processes that you try to run, then you got the explanation of this error. \
+Ask the Internet about tutorials on how to increase the files limit such as: https://rtcamp.com/tutorials/linux/increase-open-files-limit/",
+             strerror(errno));
+    	  }
+        xbt_die("Impossible to create temporary file for memory mapping: %s",
+        		strerror(errno));
+      }
 
       status = unlink (path);
       if (status)