This page has information on how to increase the limit of open files.
Pass 1 and 3 don't require reboot.
2007/10/31, George Bosilca <bosilca_at_[hidden]>:
> For some version of Open MPI (recent versions) you can use the
> btl_tcp_disable_family MCA parameter to disable the IPv6 at runtime.
> Unfortunately, there is no similar option allowing you to disable IPv6
> for the runtime environment.
> On Oct 31, 2007, at 6:55 PM, Tim Prins wrote:
> > Hi Clement,
> > I seem to recall (though this may have changed) that if a system
> > supports
> > ipv6, we may open both ipv4 and ipv6 sockets. This can be worked
> > around by
> > configuring Open MPI with --disable-ipv6
> > Other then that, I don't know of anything else to do except raise
> > the limit
> > for the number of open files.
> > I know it doesn't help you now, but we are actively working on this
> > problem
> > for Open MPI 1.3. This version will introduce a tree routing scheme
> > which
> > will dramatically reduce the number of open sockets that the runtime
> > system
> > needs.
> > Hope this helps,
> > Tim
> > On Tuesday 30 October 2007 07:15:42 pm Clement Kam Man Chu wrote:
> >> Hi,
> >> I got a "Too many open files" error while running over 1024
> >> processes
> >> on 512 cpus. I found the same error on
> >> http://www.open-mpi.org/community/lists/users/2006/11/2216.php, but I
> >> would like to know whether it is another solution instead of changing
> >> limit descriptors. The limit descriptors is changed by root access
> >> and
> >> needs to restart the system that I don't want to.
> >> Regards,
> >> Clement
> > _______________________________________________
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