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<TITLE>Re: [Beowulf] Please help to setup Beowulf</TITLE>
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On 2/20/09 10:22 AM, "Reuti" <<a href="reuti@staff.uni-marburg.de">reuti@staff.uni-marburg.de</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Am 20.02.2009 um 14:36 schrieb Prentice Bisbal:<BR>
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> Bill Broadley wrote:<BR>
>> SGE does seem the default for<BR>
>> many small/medium clusters these days (and is the Rocks default) <BR>
>> but does make<BR>
>> some things strangely hard, usually with a work around though. In <BR>
>> particular<BR>
>> I find the lack of a straight forward way to handle requesting <BR>
>> nodes and<BR>
>> processors per node strange.<BR>
><BR>
> Me, too. Users are asking me for ppn=x functionality like Torque/PBS<BR>
> has, and I'm finding pretty complicated to implement on SGE.<BR>
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Well, you have to setup nearly identical PEs like openmpi2, openmpi4 <BR>
with a fixed allocation rule of 2 or 4 respectively.<BR>
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OTOH: Once I looked into Torque and found, that with "nodes=2:ppn=2" <BR>
I got just one node with 4 slots in total of course. I don't know, <BR>
whether it can still happen to get such a distribution.<BR>
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</SPAN></FONT></BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>yes, you certainly can get such a distribution with torque. Moab and Maui can be configured to remap a nodes=X:ppn=Y to some other configuration to improve utilization, but you can turn that feature off and then the user gets precisely the distribution that they request. As far as I know work is being done to allow the behavior to be chosen at submit time. <BR>
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-- <BR>
Glen L. Beane<BR>
Software Engineer<BR>
The Jackson Laboratory<BR>
Phone (207) 288-6153<BR>
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