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Right, its not that PBS doesn't support it, its more of a policy
thing. On the TeraGrid, my experience has been that when PBS (or
whatever LRM is being used) allocates CPUs, it always allocates at the
machine level, not at the CPU level. That means, if you have an 8
processor machine, and you get 1 processor on that machine, then you
get (and are charged for) the whole machine as you have exclusive
rights to this machine for the duration of your reservation. I have
seen this behave differently in other environments, such as TeraPort,
where PBS was allocating at the processor level, and not the machine
level. This is why I said that I think Swift would need to somehow
handle this at the worker node scripts, and not rely necessarily on the
LRM doing this. <br>
<br>
Ioan<br>
<br>
Ben Clifford wrote:
<blockquote
cite="mid:Pine.LNX.4.64.0711061811080.20932@dildano.hawaga.org.uk"
type="cite">
<pre wrap="">
On Tue, 6 Nov 2007, Ioan Raicu wrote:
</pre>
<blockquote type="cite">
<pre wrap="">2) the LRM allows the partitioning of the SMP machine into smaller pieces; for
example, with 8 processor node, if it lets you submit 8 jobs that only need 1
processor, and it will launch 8 different jobs on the same node, then you are
fine... the parallelism will be done automatically by the LRM, as long as you
ask for only 1 process at a time; on the TG at least, I don't think this is
how things work, and when you get a node, regardless of how many processors it
has, you get full access to all processors, not just the ones you asked for.
</pre>
</blockquote>
<pre wrap=""><!---->
PBS allows the specification of multiple processes per node, like this
(grabbed from google)
</pre>
<blockquote type="cite">
<pre wrap="">qsub -l walltime=15:00,nodes=1:ppn=1 script.pbs
</pre>
</blockquote>
<pre wrap=""><!---->
It looks like abe runs PBS.
So I think you could specify a globus profile key in the sites.xml,
perhaps something like this:
<profile namespace="globus" key="ppn">8</profile>
I haven't tried this myself, but I'd be interested to hear your results.
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
============================================
Ioan Raicu
Ph.D. Student
============================================
Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
============================================
Email: <a class="moz-txt-link-abbreviated" href="mailto:iraicu@cs.uchicago.edu">iraicu@cs.uchicago.edu</a>
Web: <a class="moz-txt-link-freetext" href="http://www.cs.uchicago.edu/~iraicu">http://www.cs.uchicago.edu/~iraicu</a>
<a class="moz-txt-link-freetext" href="http://dsl.cs.uchicago.edu/">http://dsl.cs.uchicago.edu/</a>
============================================
============================================</pre>
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