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From: Tim Prins (tprins_at_[hidden])
Date: 2007-10-31 18:55:47

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

Hope this helps,


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
>, 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