[mpich-discuss] MPI_Comm_accept() pins cpu core 100%

[Balaji, Pavan]

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 <dlieu.7 at gmail.com> 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
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