Re: [OMPI users] Asymmetric performance with nonblocking, multithreaded communications

2011-12-09 Thread Patrik Jonsson
Hi Yiannis, On Fri, Dec 9, 2011 at 10:21 AM, Yiannis Papadopoulos wrote: > Patrik Jonsson wrote: >> >> Hi all, >> >> I'm seeing performance issues I don't understand in my multithreaded >> MPI code, and I was hoping someone could shed some light on this. >> >> The code structure is as follows: A

Re: [OMPI users] Asymmetric performance with nonblocking, multithreaded communications

2011-12-09 Thread Yiannis Papadopoulos
Patrik Jonsson wrote: Hi all, I'm seeing performance issues I don't understand in my multithreaded MPI code, and I was hoping someone could shed some light on this. The code structure is as follows: A computational domain is decomposed into MPI tasks. Each MPI task has a "master thread" that re

Re: [OMPI users] Asymmetric performance with nonblocking, multithreaded communications

2011-11-30 Thread Patrik Jonsson
Replying to my own post, I'd like to add some info: After making the master thread put more of a premium on receiving the missing messages, the problem went away. Both tasks now appear to keep up on the messages sent from the other. However, after about a minute and ~1.5e6 messages exchanged, both