Help needed: MPI problem

William Gropp gropp at
Fri Jan 4 08:52:26 EST 2002

At 02:19 AM 1/4/2002 -0500, Hao He wrote:
>Hi, there.
>Just installed mpich 1.2.0 and PGI compiler 3.2-4 on my cluster with RH7.1.
>Each node has 2 Pentium III processors and 2 3Com 905 NICs.
>When I running some simple program such as myname.c on the cluster, 
>sometimes I got error messages look like following:
>My name is w3
>p12_1012:  p4_error: OOPS: semop lock failed
>: 7241731
>My name is w7

Bug reports about MPICH should be sent to mpi-maint at
To answer your question, this means that MPICH received an error return 
when attempting to use a semaphore.  This could be because the pool of 
available semaphores has been exhausted; you can try the command 
mpich/sbin/cleanipcs to free them.  You should also update to the most 
recent version of MPICH, .


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