Greetings all,
First of all thank you all for the help.
I tried using locks and still I get following problems :
1) When multiple threads calling MPI_Comm_Spawn (sequentially or in
parallel), some spawned processes hang up on its
"MPI_Init_thread(NULL,NULL,MPI_THREAD_MULTIPLE,&sup);"
method.
Are these threads running for long periods of time? I ask because
there typically are system limits on the number of pipes any one
process can open, which is what you appear to be hitting. You can
check two things (as the error message tells you :-)):
1. set -mca opal_set_max_sys_limits 1 o
Ralph , thank you for your help.
I set "-mca opal_set_max_sys_limits 1" and my "ulimit" us "unlimited" ,
but still I get the errors.
What's happening now is ,for every user request(webservice request) a
new thread is created and in the same thread I spawn processes and these
newly spawned pro
