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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’m still quite confused about what
you’re doing. I don’t know whether or not you’re using the
--ncpus option because you haven’t posted the way in which you are
starting your MPDs. Personally, I start my nodes’ MPDs at boot time in
the /etc/rc.local script. I always start my jobs from the head node (which is
running the main MPD) without a machine file because I don’t care which
process ranks are running on which nodes as long as all the nodes get the
correct load. In your case, you should start your MPDs with the --ncpus option
depending on how many cores the machine has, and then start a job WITHOUT a
machine file and using “-np <total number of cores>”. That
should create a job that properly distributes your process over every core
(i.e. it runs 8 processes on each machine with 8 cores, 4 processes on each
machine with 4 cores, and 2 processes on each machine with 2 cores). The
caveat is that if you run less than “-np <total number of cores>”
the end result won’t be balanced (i.e. your 2 core machines would be
unused if they were the last nodes in your MPD ring and you ran “-np <total
number of cores - 4>”.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hope this helps,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Matt<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Christian M.
Probst [mailto:cmacprobst@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, May 14, 2007 9:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Matthew Chambers<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [MPICH] MPICH2 doesn´t
distribute jobs when running applications</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I thought that machine file would be a good place to equilibrate
resources... I have 2 servers with 8 cores, 3 with 4 and 2 with 2... So, in the
machine file, I inform how many processes could be running in the MPD ring... <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>As you probably saw, I am not using the --ncpus options, although now I
wonder if informing the processor number in the machine file would be
equivalnet?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks.<br>
Christian<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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