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Subject: Re: [OMPI users] openib_reg_mr
From: Ralph Castain (rhc_at_[hidden])
Date: 2012-06-15 11:32:49

Hi Marcus

Sounds like you might be running out of IB resources as opposed to main memory - not much we can suggest there other than trying to set queue sizes, which is a complicated option. You might look at "ompi_info --param btl openib" and see if adjusting some of those helps.


On Jun 15, 2012, at 9:26 AM, Daniels, Marcus G wrote:

> On Jun 15, 2012, at 8:02 AM, Jeff Squyres wrote:
>> Were there any clues in /var/log/messages or dmesg?
> Thanks. I found a suggestion from Nathan Hjelm to add "options mlx4_core log_mtts_per_seg=X" (where X is 5 in my case).
> Offline suggestions (which also included that) were also add "--mca mpi_leave_pinned 0" to the mpirun line and to double check my locked memory limits.
> The only thing I find works reliably is to use "-npernode 32" instead of "-npernode 48". Unfortunately my system has 48 processor node.
> I've got lots of headroom on real memory.
> Marcus
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