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more informative error message in some obscure error settings
[simgrid.git]
/
src
/
smpi
/
smpi_bench.c
diff --git
a/src/smpi/smpi_bench.c
b/src/smpi/smpi_bench.c
index
55970de
..
c5997c8
100644
(file)
--- 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();
@@
-753,8
+753,24
@@
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\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)