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<p>After further investigaion, i<span style="font-size: 12pt;">t seems like this XDS software is using memory mapped io when operating on the files.</span></p>
<p>Is it possible that MMAP IO has a higher performance hit by AFM than regular file access?</p>
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<p>/Andreas</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Från:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> för Andreas Mattsson <andreas.mattsson@maxiv.lu.se><br>
<b>Skickat:</b> den 1 oktober 2019 08:33:35<br>
<b>Till:</b> gpfsug main discussion list<br>
<b>Ämne:</b> Re: [gpfsug-discuss] afmRefreshAsync questions</font>
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<p>Hi,</p>
<p>I've tried increasing all the refresh intervals, but even at 300 seconds, there is very little performance increase.</p>
<p>The job runs in several steps, and gets held up at two places, as far as I can see.</p>
<p>First at a kind of parallelisation step where about 1000-3000 files are created in the current working folder on a single compute node, and then at a step where lots of small output files are written on each of the compute nodes involved in the job. </p>
<p>Comparing with running the same data set on a non-AFM cache fileset in the same storage system, it runs at least a factor 5 slower, even with really high refresh intervals.</p>
<p>In the Scale documentation, it states that the afmRefreshAsync is only configurable cluster wide. Is it also configurable on a per-fileset level?</p>
<p><a href="https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.3/com.ibm.spectrum.scale.v5r03.doc/bl1adm_configurationparametersAFM.htm" class="OWAAutoLink" id="LPlnk531768" previewremoved="true">https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.3/com.ibm.spectrum.scale.v5r03.doc/bl1adm_configurationparametersAFM.htm</a><br>
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<p>The software is XDS, <a href="http://xds.mpimf-heidelberg.mpg.de/" class="OWAAutoLink" id="LPlnk673558" previewremoved="true">http://xds.mpimf-heidelberg.mpg.de/</a></p>
<p>Unfortunately it is a closed source software, so it is not possible to adapt the software.</p>
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<p>Regards,</p>
<p>Andreas Mattsson</p>
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<div style="font-family:Tahoma; font-size:13px"><span style="font-family:"Lucida Grande",serif; color:black"></span><b><span style="font-size:10pt; color:black; font-family:Calibri,Helvetica,sans-serif">Andreas Mattsson</span></b><br>
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<span style="font-family:Calibri,Helvetica,sans-serif"></span><b><span style="font-size:10pt; color:black"></span></b><span style="font-size:8pt; color:black"><span style="font-family:Calibri,Helvetica,sans-serif">Syst</span><span style="font-size:8pt; font-family:Calibri,Helvetica,sans-serif"></span><span style="font-family:Calibri,Helvetica,sans-serif">ems
Engineer</span></span><span style="font-size:12pt; font-family:"Times New Roman",serif; color:black"></span></p>
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<span style="font-family:Calibri,Helvetica,sans-serif"></span><span style="font-size:8pt; color:black"><span style="font-family:Calibri,Helvetica,sans-serif">MAX IV Laboratory</span><br>
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<span style="font-family:Calibri,Helvetica,sans-serif"></span></span><span style="font-size:8.5pt; font-family:"Times New Roman",serif; color:black"><span style="font-family:Calibri,Helvetica,sans-serif">P.O. Box 118, SE-221 00 Lund, Sweden</span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Från:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> för Venkateswara R Puvvada <vpuvvada@in.ibm.com><br>
<b>Skickat:</b> den 27 september 2019 10:23:13<br>
<b>Till:</b> gpfsug main discussion list<br>
<b>Ämne:</b> Re: [gpfsug-discuss] afmRefreshAsync questions</font>
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<div><font size="2" face="sans-serif">Hi,</font><br>
<br>
<font size="2" face="sans-serif">Both storage and client clusters have to be on 5.0.3.x to get the AFM revalidation performance with
</font><font size="3" face="Calibri">afmRefreshAsync</font><font size="2" face="sans-serif">. What are the refresh intervals ?, you could also try increasing them. Is this config option set at fileset level or cluster level ?</font><br>
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<font size="2" face="sans-serif">~Venkat (vpuvvada@in.ibm.com)</font><br>
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<font size="1" color="#5f5f5f" face="sans-serif">From: </font><font size="1" face="sans-serif">Andreas Mattsson <andreas.mattsson@maxiv.lu.se></font><br>
<font size="1" color="#5f5f5f" face="sans-serif">To: </font><font size="1" face="sans-serif">GPFS User Group <gpfsug-discuss@spectrumscale.org></font><br>
<font size="1" color="#5f5f5f" face="sans-serif">Date: </font><font size="1" face="sans-serif">09/26/2019 03:26 PM</font><br>
<font size="1" color="#5f5f5f" face="sans-serif">Subject: </font><font size="1" face="sans-serif">[EXTERNAL] [gpfsug-discuss] afmRefreshAsync questions</font><br>
<font size="1" color="#5f5f5f" face="sans-serif">Sent by: </font><font size="1" face="sans-serif">gpfsug-discuss-bounces@spectrumscale.org</font><br>
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<font size="3" face="Calibri">Hi,</font><br>
<font size="3" face="Calibri">Due to having a data analysis software that isn't running well at all in our AFM caches, it runs 4-6 times slower on an AFM cache than on a non-AFM fileset on the same storage system, I wanted to try out the afmRefreshAsync feature
that came with 5.0.3 to see if it is the cache data refresh that is holding things up.</font><br>
<font size="3" face="Calibri">Enabling this feature has had zero impact on performance of the software though.</font><br>
<br>
<font size="3" face="Calibri">The storage cluster is running 5.0.3.x, and afmRefreshAsync has been set there, but at the moment the remote-mounting client cluster is still running 5.0.2.x.</font><br>
<font size="3" face="Calibri">Would this feature still have any effect in this setup?</font><br>
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<font size="3" face="Calibri">Regards,</font><br>
<font size="3" face="Calibri">Andreas Mattsson</font><br>
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<font size="3" face="Times New Roman">____________________________________________</font><br>
<img style="border:0px solid;" src="cid:_4_DB7D1BA8DB7D1920002E115D65258482">
<p><br>
<font size="2" face="Calibri"><b>Andreas Mattsson</b></font><br>
<font size="1" face="Calibri">Systems Engineer</font><br>
<font size="3" face="Calibri"> </font><br>
<font size="1" face="Calibri">MAX IV Laboratory<br>
Lund University</font><font size="1" face="Calibri"><br>
P.O. Box 118, SE-221 00 Lund, Sweden<br>
Visiting address: Fotongatan 2, 224 84 Lund</font><font size="1" face="Calibri"><br>
Mobile: +46 706 64 95 44</font><font size="1" color="blue" face="Calibri"><u><br>
</u></font><a href="mailto:andreas.mattsson@maxiv.se" target="_blank"></a><a href="mailto:andreas.mattsson@maxiv.lu.se"><font size="1" color="blue" face="Calibri"><u>andreas.mattsson@maxiv.lu.se</u></font></a><font size="1" color="blue" face="Calibri"><u><br>
</u></font><a href="http://www.maxiv.se/" target="_blank"><font size="1" color="blue" face="Calibri"><u>www.maxiv.se</u></font></a></p>
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