Hi Thomas, Thanks for reporting. Could you please give a try with the current development version and let us know if you still experience the segfault? git clone git://git.mpich.org/mpich.git[1] OR alternatively http://git.mpich.org/mpich.git[2] Thanks, Antonio On Wednesday, July 24, 2013 03:01:30 PM Thomas Ropars wrote:

Hi,

I'm working with mpich 3.0.4 and I get a segfault in Hydra when I try to run an application on a large number of processes (8192).

I simply run the following command: mpirun -f ~/machine_list -n 8192 my_exec_file

I tried to run mpirun in valgrind to identify the problem and here is the output: Invalid read of size 1 ==44266== at 0x4A077F2: __GI_strlen (mc_replace_strmem.c:284) ==44266== by 0x3D774802B5: strdup (in /lib64/libc-2.12.so) ==44266== by 0x40EBA5: HYD_pmcd_pmi_fill_in_exec_launch_info (pmiserv_utils.\ c:375) ==44266== by 0x40A5C2: HYD_pmci_launch_procs (pmiserv_pmci.c:121) ==44266== by 0x403A1E: main (mpiexec.c:326) ==44266== Address 0x0 is not stack'd, malloc'd or (recently) free'd

If I try to run on a smaller number of processes (eg 512), everything works fine.

Any suggestion to solve the problem?

Thomas

_______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss -- Antonio J. Peña Postdoctoral Appointee Mathematics and Computer Science Division Argonne National Laboratory 9700 South Cass Avenue, Bldg. 240, Of. 3148 Argonne, IL 60439-4847 (+1) 630-252-7928 [email protected] www.mcs.anl.gov/~apenya

-------- [1] git://git.mpich.org/mpich.git [2] http://git.mpich.org/mpich.git