<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Ben,<br>
The #s below were from the SiCortex, which only has NFS. We are using
the latest Swift from SVN, so if the Swift improvements to avoid these
bottlenecks are enabled by default in Swift, then we are using them
already!<br>
<br>
On the BG/P, we have GPFS and PVFS, but we found GPFS to handle
meta-data better, so we are using GPFS for all our tests.<br>
<br>
Ioan<br>
<br>
Ben Clifford wrote:
<blockquote
cite="mid:Pine.LNX.4.64.0804010855270.9854@dildano.hawaga.org.uk"
type="cite">
<pre wrap="">On Tue, 25 Mar 2008, Michael Wilde wrote:
</pre>
<blockquote type="cite">
<pre wrap="">With this fixed, the total time in wrapper.sh including the app is now about
15 seconds, with 3 being in the app-wrapper itself. The time seems about
evenly spread over the several wrapper.sh operations, which is not surprising
when 500 wrappers hit NFS all at once.
</pre>
</blockquote>
<pre wrap=""><!---->
Does this machine have a higher (/different) performance shared file
system such as PVFS or GPFS? We spent some time in november layout out the
filesystem to be sympathetic to GPFS to help avoid bottlenecks like you
are seeing here. It would be kinda sad if either it isn't available or you
aren't using it even though it is available.
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
===================================================
Ioan Raicu
Ph.D. Candidate
===================================================
Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
===================================================
Email: <a class="moz-txt-link-abbreviated" href="mailto:iraicu@cs.uchicago.edu">iraicu@cs.uchicago.edu</a>
Web: <a class="moz-txt-link-freetext" href="http://www.cs.uchicago.edu/~iraicu">http://www.cs.uchicago.edu/~iraicu</a>
<a class="moz-txt-link-freetext" href="http://dev.globus.org/wiki/Incubator/Falkon">http://dev.globus.org/wiki/Incubator/Falkon</a>
<a class="moz-txt-link-freetext" href="http://dsl-wiki.cs.uchicago.edu/index.php/Main_Page">http://dsl-wiki.cs.uchicago.edu/index.php/Main_Page</a>
===================================================
===================================================
</pre>
</body>
</html>