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

 

Trinity Consultants

12770 Merit Drive, Suite 900  |  Dallas, Texas 75251

Office:  972-661-8100|  Mobile:  806-281-7617

Email:  abhat@trinityconsultants.com  |  LinkedIn: www.linkedin.com/in/abhattrinityconsultants

 

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