Brian,
What is the limit? I have a problem that only fails when run on 1024
processes, but I need to reproduce it on a system with only 12 nodes...
Thanks,
Ben
-----Original Message-----
From: lam-bounces_at_[hidden] [mailto:lam-bounces_at_[hidden]] On Behalf Of
Paul H. Hargrove
Sent: Monday, October 08, 2007 1:16 PM
To: General LAM/MPI mailing list
Subject: Re: LAM: Maximum number of processes per node???
Brian Barrett wrote:
> On Oct 8, 2007, at 11:57 AM, Ben Held wrote:
>
>> I have a need to run around 100 processes per node on a small Linux
>> cluster running LAM 7.1 I can only seem to run about 40 - after
>> that it just fails. Although I have not seen an error about too
>> many file descriptors, I did increase this limit by a factor of 8
>> and no luck.
>>
>> Does LAM have a built in limit? Can it be overridden?
>>
>>
>
> Yes, there is a built-in limit. We have not experimented with making
> it larger, and the only way to override it is to change some magic
> defines I can't recall at this time. So overriding the limit is both
> unsupported and not recommended.
>
>
> Good luck,
>
> Brian
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
IIRC, the limit is in the lamd's management of its children. If so,
might it be possible to "trick" lamboot into starting multiple lamd's
per node to circumvent this?
-Paul
--
Paul H. Hargrove PHHargrove_at_[hidden]
Future Technologies Group
HPC Research Department Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
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