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<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>Hi!</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'> </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>We’re looking at implementing a large
G5 cluster here at BAE Systems.</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'> </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>Have you gained any new ‘lessons
learned’ since the communication </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>below? Can you recommend a good version of
MPI to use for these?</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>We’ve been looking at MPICH, MPIPro
and also the Apple xgrid…</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'> </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>Thanks!</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'> </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>Jonathan Hujsak</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>BAE Systems</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>San Diego</span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'> </span></font></b></p>
<p class=MsoNormal><b><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>Bill Broadley</span></font></b><font
face=Arial><span style='font-family:Arial'> <a
href="mailto:beowulf%40beowulf.org?Subject=%5BBeowulf%5D%2064bit%20comparisons&In-Reply-To=200405141644.i4EGi1Aq023213%40marvin.ibest.uidaho.edu"
title="[Beowulf] 64bit comparisons">bill at cse.ucdavis.edu </a><br>
<i><span style='font-style:italic'>Fri May 14 </span></i></span></font><i><font face=Arial><span style='font-family:Arial;font-style:italic'>11:48:21 PDT</span></font></i><i><font
face=Arial><span style='font-family:Arial;font-style:italic'> 2004</span></font></i><font
face=Arial><span style='font-family:Arial'> </span></font></p>
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64bit comparisons </a></span></font></li>
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<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><!--beginarticle-->On </span></font>Fri, May 14, 2004 at 09:44:01AM -0700, Robert B Heckendorn wrote:</pre><pre><font size=2
face="Courier New"><span style='font-size:10.0pt'>><i><span
style='font-style:italic'> One of the options we are strongly considering for our next cluster is</span></i></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><i><span
style='font-style:italic'> going with Apple X-servers. There performance is purported to be good</span></i></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Careful to benchmark both processors at the same time if that is your</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>intended usage pattern. Are the dual-g5's shipping yet? Last I heard</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>yield problems were resulting in only uniprocessor shipments. My main</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>concern that despite the marketing blurb of 2 10GB/sec CPU interfaces</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>or similar that there is a shared 6.4 GB/sec memory bus.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><i><span
style='font-style:italic'> and their power consumption is small.</span></i></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Has anyone measured a dual g5 xserv with a kill-a-watt or similar?</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><i><span
style='font-style:italic'> Can people comment on any comparisons betwee Apple and (Athlon64</span></i></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>><i><span
style='font-style:italic'> or Opteron)?</span></i></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Personally I've had problems, I need to spend more time resolving them,</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>things like:</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Need to tweak /etc/rc to allow Mpich to use shared memory</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Latency between two mpich processes on the same node is 10-20 times the </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> linux latency. I've yet to try LAM.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Differences in semaphores requires a rewrite for some linux code I had</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Difference in the IBM fortran compiler required a rewrite compared to code</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> that ran on Intel's, </span></font>portland group's, and GNU's fortran compiler. </pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Given all that I'm still interested to see what the G5 is good at and under</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>what workloads the G5 wins perf/price or perf/watt.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>-- </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Bill Broadley</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Computational Science and Engineering</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>UC Davis</span></font></pre>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
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