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<p>Hallo Gilad,</p>
<p><br></p>
<p>Donnerstag, 12. Juni 2008, meintest Du:</p>
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<p><span class=rvts7>What is the chipset that you have?</span></p>
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<p>MCP55 by Nvidia. </p>
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<p>OFED 1.3 and MVAPICH2 1.03 and 1.02 tested.</p>
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<p>Regards,</p>
<p>Jan</p>
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<p><span class=rvts8>From:</span><span class=rvts9> beowulf-bounces@beowulf.org [mailto:beowulf-bounces@beowulf.org] </span><span class=rvts8>On Behalf Of </span><span class=rvts9>Jan Heichler</span></p>
<p><span class=rvts8>Sent:</span><span class=rvts9> Thursday, June 12, 2008 2:28 PM</span></p>
<p><span class=rvts8>To:</span><span class=rvts9> Beowulf Mailing List</span></p>
<p><span class=rvts8>Subject:</span><span class=rvts9> [Beowulf] MVAPICH2 and osu_latency</span></p>
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<p><span class=rvts10>Dear all!</span></p>
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<p><span class=rvts10>I found this </span><span class=rvts11>http://mvapich.cse.ohio-state.edu/performance/mvapich2/opteron/MVAPICH2-opteron-gen2-DDR.shtml</span><span class=rvts10> as reference value for MPI-latency of Infiniband. I try to reproduce those numbers at the moment but i'm stuck with</span></p>
<p><br></p>
<p><span class=rvts10># OSU MPI Latency Test v3.0</span></p>
<p><span class=rvts10># Size Latency (us)</span></p>
<p><span class=rvts10>0 3.07</span></p>
<p><span class=rvts10>1 3.17</span></p>
<p><span class=rvts10>2 3.16</span></p>
<p><span class=rvts10>4 3.15</span></p>
<p><span class=rvts10>8 3.19</span></p>
<p><br></p>
<p><span class=rvts10>Equipment is two quadsocket Opteron Blades (Supermicro) with Mellanox Ex DDR cards. Single 24 port switch connects them.</span></p>
<p><br></p>
<p><span class=rvts10>Can anybody help with suggestions what i can do to lower the latency? </span></p>
<p><span class=rvts10> </span></p>
<p><br></p>
<p><span class=rvts10>Regards, Jan </span></p>
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<p>Bye Jan </p>
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