On Aug 29, 2011, at 4:22 PM, Eugene Loh wrote:

> It seems to me the FAQ item 
> http://www.open-mpi.org/faq/?category=large-clusters#fd-limits needs 
> updating.  I'm willing to give this a try, but need some help first.  (I'm 
> even more willing to let someone else do all this, but I'm not holding my 
> breath.)
> 
> For example, the text sounds dated -- e.g., with references to v1.2.  Is the 
> "road map" discussion still current?

No - we should remove that stuff, as well as discussion of the 1.2 issues as we 
no longer support code that old.

> 
> Is the estimate of the needed number of descriptors our current best guess?

No - it's incorrect.

> 
> The FAQ is missing discussion of how to increase the limit.  For something 
> like "limit/ulimit/unlimit", where should this be done?  In .login?  I assume 
> it's not sufficient simply to set this in the shell where mpirun is executed, 
> assuming processes will also be launched on remote nodes.  Yes?
> 
> (And, clearly, the FAQ item is missing discussion of the MCA parameter 
> opal_set_max_sys_limits.)

I'll take a first cut at it - may leave the discussion of how to increase the 
limits to you.


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