[mpich-discuss] Error Running MPICH for Photochemical Modeling

[Seo, Sangmin]

Hi Abhishek,

Can you try with the recent MPICH release to see if the same error happens? You can download the recent release, 3.1.2, from http://www.mpich.org/downloads/.

Thanks,
Sangmin


On Sep 12, 2014, at 12:59 PM, Abhishek Bhat <abhat at trinityconsultants.com<mailto:abhat at trinityconsultants.com>> wrote:

I am running a photochemical modeling on Linux cluster (CentOS_64 bit) with 1 master and 8 slave nodes with quad core (intel i7) on each node.  I have two scenarios, in first scenario, I am running less data intensive run on all 8 nodes (NUMPROCS = 9) and the run will go fine.  When running same configuration for a more intense run, I am getting following error.

Fatal error in MPI_Recv: Other MPI error, error stack:
MPI_Recv(187).....................: MPI_Recv(buf=0x7fff989d53b0, count=644490, MPI_REAL, src=1, tag=14131, MPI_COMM_WORLD, status=0x7fff995d96a0) failed
MPIDI_CH3I_Progress(150)..........:
MPID_nem_mpich2_blocking_recv(948):
MPID_nem_tcp_connpoll(1720).......:
state_commrdy_handler(1556).......:
MPID_nem_tcp_recv_handler(1446)...: socket closed
rank 1 in job 1  dfw-camx_55000   caused collective abort of all ranks
  exit status of rank 1: killed by signal 9

If I run the program with smaller nodes (smaller than 7 NUMPROCS) the run goes fine.

It appears that the rank 1 (my first node) is collectively causing all the ranks, but I could identify why.  I tried following solutions –

1.       Increased master memory to 32 gb
2.       Increased all nodes memory to 32 gb
3.       Exchanged the rank 1 to different node in the parallel.

In all situations, I am getting this error.  Surprisingly, when I am running smaller (less data intensive runs), I am not getting this error even if I increase the NUMPROCS to 32 processes.

Any help will be highly appreciated.

I am running mpich 1.4

Thank You
Abhishek
………………………………………………………………………………………………….
Abhishek Bhat, PhD, EPI,
Senior Consultant

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