Am 20.02.2009 um 15:37 schrieb Bogdan Costescu:
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.
This is just, as they have a replacement called qrsh for the ususal
rsh/ssh calls (as you know, but maybe others on the list not).
Although it was in former times just using a special version of rsh,
it was in the end under full control of SGE. In such a setup, the
tradititonal rsh/ssh can be disabled completely inside the cluster
(or ssh just limited to admin staff).
Nowadays it's replaced by a builtin startup method which is more
scalable.
Having both, a TM and a tight integrated RSH/SSH replacement would of
course be the best. Linda (which is Gaussian's parallel library)
starts only with rsh/ssh. I see sites, having exactly for this
purpose a "cleaner" script running in their Torque operated cluster
to get rid of such kinds of jobs, as Torque can't know, what was
started by rsh/ssh on some nodes.
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.
It's successor Open MPI calls qrsh directly, when it discovers that
it's running under SGE. It just checks some environment variables.
-- Reuti
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.
--
Bogdan Costescu
IWR, University of Heidelberg, INF 368, D-69120 Heidelberg, Germany
Phone: +49 6221 54 8240, Fax: +49 6221 54 8850
E-mail: bogdan.coste...@iwr.uni-heidelberg.de
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