<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr">ok, thank you. <div><br></div><div>What implications does this have? does this reduce the solution capabilities/performance in any specific way?<br><div><br></div><div>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.</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 9, 2016 at 6:35 AM, Balaji, Pavan <span dir="ltr"><<a href="mailto:balaji@anl.gov" target="_blank">balaji@anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
For now, the only workaround for this is to configure with --with-device=ch3:sock<br>
<br>
-- Pavan<br>
<div><div class="h5"><br>
> On May 6, 2016, at 5:49 PM, Dmitriy Lyubimov <<a href="mailto:dlieu.7@gmail.com">dlieu.7@gmail.com</a>> wrote:<br>
><br>
> Hi,<br>
><br>
> 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.<br>
><br>
> I have observed that all processes that wait in MPI_Comm_accept(), pin 1 cpu core exactly 100%.<br>
><br>
> 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.<br>
><br>
> Is this a known problem? is there a workaround for this?<br>
><br>
> 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.<br>
><br>
> Thank you very much in advance.<br>
> -Dmitriy<br>
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