This page has information on how to increase the limit of open files.
Pass 1 and 3 don't require reboot.
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
> 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
> for Open MPI 1.3. This version will introduce a tree routing scheme
> will dramatically reduce the number of open sockets that the runtime
> Hope this helps,
> On Tuesday 30 October 2007 07:15:42 pm Clement Kam Man Chu wrote:
>> I got a "Too many open files" error while running over 1024
>> 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
>> needs to restart the system that I don't want to.
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