Probably it was the changing from eager to rendezvous protocols as Jeff
said.
If you don't know what are these, read this:
https://computing.llnl.gov/tutorials/mpi_performance/#Protocols
http://blogs.cisco.com/performance/what-is-an-mpi-eager-limit/
http://blogs.cisco.com/performance/eager-limits-
This page has information on how to increase the limit of open files.
Pass 1 and 3 don't require reboot.
http://www.cs.uwaterloo.ca/~brecht/servers/openfiles.html
2007/10/31, George Bosilca :
>
> For some version of Open MPI (recent versions) you can use the
> btl_tcp_disable_family MCA paramete
Try using the info parameter in MPI::Intracomm::Spawn().
In this structure, you can say in which hosts you want to spawn.
Info parameters for MPI spawn:
http://www.mpi-forum.org/docs/mpi-20-html/node97.htm
2007/12/12, Elena Zhebel :
>
> Hello,
>
> I'm working on a MPI application where I'm usin
How mpi handles the host string passed in the info argument to
mpi_comm_spawn() ?
if I set host to:
"host1,host2,host3,host2,host2,host1"
then ranks 0 and 5 will run in host1, ranks 1,3,4 in host 2 and rank 3 in
host3?
s
> Ralph
>
>
>
> On 5/29/08 6:41 PM, "Bruno Coutinho" wrote:
>
> > How mpi handles the host string passed in the info argument to
> > mpi_comm_spawn() ?
> >
> > if I set host to:
> > "host1,host2,host3,host2,host2,host1"
&
