Hello Dmittiy, can you maybe create a simple example-program to reproduce this failure? It is also often easier also to look at a code example to identify a problem. Thanks, Lena
On Jan 11, 2017, at 2:45 AM, Dmitriy Lyubimov <[email protected]> wrote:
Hello,
(mpich 3.2)
I have a scenario when i add a few extra processes do existing intercom.
it works as a simple loop -- (1) n processes accept on n-intercom (2) 1 process connects (3) intracom is merged into n+1 intercom, intracom and n-intercom are closed (4) repeat 1-3 as needed.
Occasionally, i observe that step 3 spuriously locks up (once i get in the range of 100+ processes). From what i can tell, all processes in step 3 are accounted for, and are waiting on the merge, but nothing happens. the collective barrier locks up.
I really have trouble resolving this issue, any ideas are appreciated!
Thank you very much. -Dmitriy
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