<br><br><div class="gmail_quote">On Nov 29, 2007 1:14 PM, amjad ali <<a href="mailto:amjad11@gmail.com">amjad11@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>Hello all,</div>
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<div>I want to develop and run my parallel code (MPI based) on a Beowulf cluster. I have no problem as such that many user might log on to the cluster simultaneously. Suppose that I am free to use cluster dedicatedly for my single parallel application.
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<div>1) Do I really need a cluster scheduler installed on the cluster? Should I use scheduler?</div></blockquote><div><br>Yes, it makes things easier to control and keep track of.<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<div>2) Is there any effect/benefit on the running of a parallel code with or without cluster job scheduler?</div></blockquote><div><br>It depends how many jobs/nodes you run on a 4 node system you would be fine running something like torque with pbs_sched. If your requirements become higher I'd recommend Maui and for those complex environments with many cores/nodes I'd recommend Moab.
<br><br>The benefit is ease of use, the more jobs you run the harder it is to manage those jobs. <br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<div>3) How you differentiate between cluster scheduler and cluster resource manager?</div></blockquote><div><br>One schedules the other gives back information about what resources are available. <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<div>4) If there is any significant difference between a scheduler and manager then plaese tell me that which of the fall in which category:</div>
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<div>OpenPBS, PBS Professional, SGE, Maui, Moab, Torque, Scyld, LSF, SLURM etc.</div></blockquote><div><br>Torque=Resource Manager (RM) w/basic scheduling<br>PBS=(RM) w/some scheduling functionality<br>SGE=(RM) w/some scheduling functionality
<br>Maui=Scheduler<br>Moab=Scheduler + More<br>OpenPBS=Use Torque<br>LSF=(RM) w/some scheduling functionality<br>SLURM=(RM) w/basic scheduling<br>A resource manager manages resources where as a scheduler can schedule these resources. Although something like torque resource manager (OpenPBS) has pbs _sched a fifo scheduler it is still in-adequate in most environments and you would need a scheduler such as Maui or Moab to schedule it.
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<div>5) What is maent by " PBS/SGE/LSF supports integration with the Maui scheduler?</div></blockquote><div><br>You have this mixed up with Moab, Moab can talk to all of these resource managers and give you a single point of job submission/administration over all resource managers.
<br><br>Cluster Resources provide free support to eval Moab which can be quite handy <a href="http://www.clusterresources.com/pages/products/evaluate.php">http://www.clusterresources.com/pages/products/evaluate.php</a><br>
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<div>Precise, easy and brief reply requested. Thanks to all. </div>
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http://www.beowulf.org/mailman/listinfo/beowulf</a><br><br></blockquote></div><br><br clear="all"><br>-- <br>------------------------------<br>Christopher Vaughan