Hi, I have a situation when a process my start up and execute MPI_Comm_accept(), while waiting for others to join, which may take some time. I have observed that all processes that wait in MPI_Comm_accept(), pin 1 cpu core exactly 100%. Which is unfortunate in my situation since if i launch enough processes, i pin the entire machine node very quickly -- and it does do other things that run into a crawl. Is this a known problem? is there a workaround for this? I tried on ubuntu 14-04 LTS which installs mpich 3.0.4 by default but i also tested 3.2 Nov/2015 and they both exhibit this very behavior. Thank you very much in advance. -Dmitriy _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss