This configuration does not support full MPI-3 and will be deprecated in the future. You'll also lose some performance compared to the default configuration, but, well, you are oversubscribing cores, so I don't think that's as much of a concern in your case. -- Pavan

On May 9, 2016, at 11:08 AM, Dmitriy Lyubimov <[email protected]> wrote:

ok, thank you.

What implications does this have? does this reduce the solution capabilities/performance in any specific way?

for now, i ended up just bumping process priority to the max priority for the duration of accept call, which is still not great but i don't want to mess with the build capabilities or ask people to install a custom build.

On Mon, May 9, 2016 at 6:35 AM, Balaji, Pavan <[email protected]> wrote:

For now, the only workaround for this is to configure with --with-device=ch3:sock

-- Pavan

...

On May 6, 2016, at 5:49 PM, Dmitriy Lyubimov <[email protected]> wrote:

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

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