Hello,
Could anyone explain the limit of MPI processes allowed to be run?
I have a Linux RedHat box with MPICH 1.2.6 using shmem installed. I cannot run
80 MPI processes (aborted with the message "exceeding max num of p4 semids
16"), 79 processes fail to finalise and 78 processes run fine. In
mpid/ch_shmem/p2psemop.c there is a definition
#define P2_MAX_SYSV_SEMIDS 8
which is used later to print out this error message:
setnum = p2_global->sysv_next_lock / 10;
if (setnum > P2_MAX_SYSV_SEMIDS)
{
p2p_error("exceeding max num of p4 semids\n",P2_MAX_SYSV_SEMIDS);
}
I cannot find where this p2_global->sysv_next_lock is initialised by 78 or 79
and why this value is set?
Thanks,
Anton
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