<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Thanks all for your reply.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">I'm now investigating your solutions and I will tell you the results afterwards.<br>
</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Any further suggestions will be welcomed :)<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On 16 May 2013 20:56, Jacob Liberman <span dir="ltr"><<a href="mailto:jliberma@redhat.com" target="_blank">jliberma@redhat.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><div><div class="h5">
<div>On 05/15/2013 08:08 AM, Reza
Bakhshayeshi wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Hi <br>
<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">I
want to perform a MPI program across the instances. I've
already done it on a traditional and virtual cluster, so I'm
pretty sure about the healthiness of my installation.<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Unfortunately
I can't perform it on a cluster of OpenStack instances.<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">
My MPI program is HPCC, it stops at the begging of
MPIRandomAccess.<br>
<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">I
would be so grateful if anyone had a similar experience or can
guess some possibilities and solutions.<br>
<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Regards,<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Reza<br>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
</div></div><div class="im"><pre>_______________________________________________
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</div></blockquote>
Does it hang or does it fail with an error? Please send along any
errors.<br>
<br>
The HPCC random access test will size the problem to half the
available RAM in the whole system.<br>
<br>
I would make sure your memory over commitment ratio is set to 1.<br>
<br>
I would also disable hyperthreading and make sure you are running on
a power of 2 processor count.<br>
<br>
You can start by running the MPI test within a single instance on a
single host.<br>
</div>
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