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<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>If you only run your application one at a time
interacatively, then you don't need to deal with the
overhead</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>and complexity of a scheduler. However if you are planning
to batch queue up a few runs or several different</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>applications, then it might be worthwhile to read into
torque/maui/moab and the like.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>You mentioned Scyld in your question below, which within
the categories you where interested</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>in is basically a ressource manager which comes with torque
prebundled to allow scheduling and batch queueing. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2>Moab/Taskmaster </FONT></SPAN><SPAN
class=678274521-14012008><FONT face=Arial color=#0000ff size=2>is then the
add-on module to allow more complex scheduling. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=678274521-14012008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=678274521-14012008><FONT face=Arial color=#0000ff
size=2>Michael</FONT></SPAN><BR></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> beowulf-bounces@beowulf.org
[mailto:beowulf-bounces@beowulf.org] <B>On Behalf Of </B>Chris
Vaughan<BR><B>Sent:</B> Wednesday, January 09, 2008 8:07 AM<BR><B>To:</B> amjad
ali<BR><B>Cc:</B> beowulf@beowulf.org<BR><B>Subject:</B> Re: [Beowulf] Why need
of a scheduler??<BR></FONT><BR></DIV>
<DIV></DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT
face=Arial color=#0000ff size=2></FONT><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="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>Hello all,</DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<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. </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>1) Do I really need a cluster scheduler installed on the cluster? Should
I use scheduler?</DIV></BLOCKQUOTE>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><BR>Yes, it makes things easier to control and keep track
of.<BR> </DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>2) Is there any effect/benefit on the running of a parallel code with or
without cluster job scheduler?</DIV></BLOCKQUOTE>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><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="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>3) How you differentiate between cluster scheduler and cluster
resource manager?</DIV></BLOCKQUOTE>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT
face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><BR>One schedules the other gives back information
about what resources are available. <BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<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>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>OpenPBS, PBS Professional, SGE, Maui, Moab, Torque, Scyld, LSF, SLURM
etc.</DIV></BLOCKQUOTE>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT
face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><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. <BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>5) What is maent by " PBS/SGE/LSF supports integration with
the Maui scheduler?</DIV></BLOCKQUOTE>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT
face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><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> </DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV>Precise, easy and brief reply requested. Thanks to all. </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff
size=2></FONT> </DIV><BR>_______________________________________________<BR>Beowulf
mailing list, <A
href="mailto:Beowulf@beowulf.org">Beowulf@beowulf.org</A><BR>To change your
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target=_blank>http://www.beowulf.org/mailman/listinfo/beowulf</A><BR><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>------------------------------<BR>Christopher Vaughan
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