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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“test between 2 virtual machines from MDT/OST server to client's local disk.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Andrew,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m confused by the description of your test. Can you clarify?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D">Brett Lee<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D">Sr. Systems Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D">Intel High Performance Data Division<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> lustre-discuss-bounces@lists.lustre.org [mailto:lustre-discuss-bounces@lists.lustre.org]
<b>On Behalf Of </b>Andrew Mast<br>
<b>Sent:</b> Friday, June 21, 2013 3:42 PM<br>
<b>To:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> [Lustre-discuss] Slow Copy (Small Files) 1 RPC In Flight?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello, I am new to Lustre and wanted to run a small simple small copy test between 2 virtual machines from MDT/OST server to client's local disk.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I realize small file performance is never fast, but this seems particularly slow considering the data is all buffered in memory with little to no disk activity.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Setup Info<o:p></o:p></p>
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<p class="MsoNormal">Version is 2.4.50<o:p></o:p></p>
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<p class="MsoNormal">Average file size is small. < 10KB<o:p></o:p></p>
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<p class="MsoNormal">The amount of data being copied is about 250MB.<o:p></o:p></p>
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<p class="MsoNormal">The VMs are on separate hosts.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Performance<o:p></o:p></p>
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<p class="MsoNormal">7 minutes over a gigabit network. <o:p></o:p></p>
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<p class="MsoNormal">NFS takes only 3 minutes.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Observations<o:p></o:p></p>
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<p class="MsoNormal">iostat on the OST/MDT is usually 0% during the copy. Assuming all buffered.<o:p></o:p></p>
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<p class="MsoNormal">Additional network traffic is minimal. <o:p></o:p></p>
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<p class="MsoNormal">CPU load on the VMs is 15-20% during copy.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">RPC stats on the client shows only 1 RPC in flight at a time. max inflight is set to 64. Is that expected behavior for a copy?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here is a snapshot of rpc_stats early during the copy:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> read write<o:p></o:p></p>
<p class="MsoNormal">pages per rpc rpcs % cum % | rpcs % cum %<o:p></o:p></p>
<p class="MsoNormal">1: 1653 90 90 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">2: 164 8 98 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">4: 7 0 99 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">8: 3 0 99 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">16: 3 0 99 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">32: 5 0 99 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">64: 0 0 99 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">128: 1 0 100 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> read write<o:p></o:p></p>
<p class="MsoNormal">rpcs in flight rpcs % cum % | rpcs % cum %<o:p></o:p></p>
<p class="MsoNormal">0: 0 0 0 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal">1: 1836 100 100 | 0 0 0<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> read write<o:p></o:p></p>
<p class="MsoNormal">offset rpcs % cum % | rpcs % cum %<o:p></o:p></p>
<p class="MsoNormal">0: 1836 100 100 | 0 0 0<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As I am new, any suggestions for what to look for or improve would be greatly appreciated.<o:p></o:p></p>
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