[Beowulf] Please help to setup Beowulf

Reuti reuti at staff.uni-marburg.de
Fri Feb 20 15:51:07 EST 2009


Am 20.02.2009 um 16:23 schrieb Prentice Bisbal:

> Bogdan Costescu wrote:
>> On Fri, 20 Feb 2009, Glen Beane wrote:
>>
>>> I looked into SGE a long time ago, but I found the MPI support
>>> terrible when compared to TORQUE/PBS Pro
>>
>> Indeed and AFAIK is still in a similar state today. There was talk  
>> for a
>> long time on the SGE devel list for a TM API to be added, but it  
>> seems
>> like this is not considered a high priority feature. I've not only
>> looked but actually used SGE for about 1 year (IIRC, about 5 years  
>> ago)
>> during which I had to spend time fixing the interactions with LAM/MPI
>> and many of the parallel applications that were used on that  
>> cluster -
>> and finally gave up. On the plus side, during the time that SGE was
>> used, I have never seen a process left behind from a job and the
>> queueing system itself seemed very stable - something that I could  
>> not
>> say for the OpenPBS/Torque that I've also tested at that time.
>>
>
> You need to take a fresh look at SGE and Open MPI. Open MPI seems  
> to be
> the new de facto standard MPI library, and you can compile it to be
> fully integrated with both SGE and Torque. I just set up a cluster  
> using
>  SGE and Open MPI (built with the --with-sge option), and I there's no
> need to tinker with the SGE's MPI startup wrapper scripts like in the
> past. Everything just works: SGE and OpenMPI communicate directly with
> each other, and SGE has complete control over ALL the MPI processes.

Attention: in 1.3 correct accounting is broken with this switch, as  
the oted will daemonize. It will only be fixed in 1.3.2 AFAIK.

-- Reuti


> A couple of years ago I did setup SGE with MPICH, and had to tinker  
> with
>  SGE's startup scripts to get everything to work correctly. Not that
> difficult.
>
> I could be wrong but I think at that time, to use Torque you needed to
> compile a separate mpiexec program developed by a 3rd party to get
> "tight integration" between MPI and Torque.
>
> -- 
> Prentice
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