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<div class="WordSection1">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hi,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">>Actually, prior to the fix for 7112034, there would be potentially fewer Reference objects identified for later >processing (a step known as discovery).<br>
>Following 7112034, there would be potentially more, as some objects not discovered before the fix would be >discovered now.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Agree!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">>This is the strange part, and to me does not make sense. How
<span class="SpellE">id</span> you determine that (1) there were lots of >Reference objects (2) that a lot<br>
>of time was spent in Reference processing during remark? If you run with -XX:+<span class="SpellE">PrintGCDetails</span> ->XX:+<span class="SpellE">PrintReferenceGC</span> for both the<br>
>cases (with and <span class="SpellE">withouyt</span> -XX:+<span class="SpellE">ParallelRefProcEnabled</span>), we would know what the relative numbers/times looked >like and perhaps<br>
>get closer to what the issue might be here.</span></font><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Attached cms_lusearch.txt is output of
<span class="SpellE">PrintGCDetails</span> which I skipped some <span class="SpellE">
ParNew</span> GC part to reduce file size. <span style="mso-spacerun:yes"> </span>The other is my record of number of objects marked in CMS phases. Since I run CMS in stop-the-world fashion (I change code a bit to do so), no object is promoted. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">cms_lusearch.log records live objects marked in that phase, I recorded it by increasing the counter
<span class="SpellE">everytime</span> an object is marked successfully. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I ran with below command line (don’t worry about -<span class="SpellE">XX:CMSInitiatingOccupancyFraction</span>=100 -XX:+<span class="SpellE">UseCMSInitiatingOccupancyOnly</span>.
I used it as part of my trick to cause CMS running in foreground):<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">JAVA_HOME=../ build/linux-amd64/j2sdk-image LD_LIBRARY_PATH=../build/hotspot_product_prof/linux_amd64_compiler2/product ../ build/<span class="SpellE">hotspot_product_prof</span>/linux_amd64_compiler2/product/gamma
–Xms100M –Xmx100M -XX:+<span class="SpellE">PrintGCDetails</span> -XX:+<span class="SpellE">PrintReferenceGC</span> -<span class="SpellE">XX:CMSInitiatingOccupancyFraction</span>=100 -XX:+<span class="SpellE">UseCMSInitiatingOccupancyOnly</span> -XX:+<span class="SpellE">UseConcMarkSweepGC</span>
-<span class="SpellE">XX:ParallelGCThreads</span>=8 -<span class="SpellE">XX:NewRatio</span>=10 -jar dacapo-9.12-bach.jar -s large -n 10 -t 8
<span class="SpellE">lusearch</span> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I recorded high number of objects marked in remark phase. As you can see in the two files, the total number of references reported is around
2-3000 refs during remark. But the number of objects marked during remarked is much more than that: 600k objects (for
<span class="SpellE">lusearch</span> application in <span class="SpellE">Dacapo</span> benchmark).
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Does this scenario normal?
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">-Nhan<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">
Srinivas Ramakrishna [mailto:ysr1729@gmail.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> Thursday, December 08, 2011 5:15 PM<br>
<b><span style="font-weight:bold">To:</span></b> Dang Nhan Nguyen<br>
<b><span style="font-weight:bold">Cc:</span></b> hotspot-gc-dev@openjdk.java.net<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: Strange GC behaviour,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">On Thu, Dec 8, 2011 at 2:41 AM, Dang Nhan Nguyen <<a href="mailto:nhann@chalmers.se">nhann@chalmers.se</a>> wrote:<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi,</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thank you for your update.</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I apply CR is 7112034 and also try with -XX:+ParallelRefProcEnabled:</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></font><o:p></o:p></p>
<p style="margin-left:.5in"><font size="2" face="Times New Roman"><span style="font-size:10.0pt">-</span></font><font size="1"><span style="font-size:7.0pt">
</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">While applying CR is 7112034, CMS still leaves about the same number of objects/ref marked for the remark phase comparing to before applying the CR. Which
means the CR make no (or little) change to the number of references processed during the concurrent marking phase. How can this be explained?</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><br>
Actually, prior to the fix for 7112034, there would be potentially fewer Reference objects identified for later processing (a step known as discovery).<br>
Following 7112034, there would be potentially more, as some objects not discovered before the fix would be discovered now.
<o:p></o:p></span></font></p>
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<p style="margin-left:.5in"><font size="2" face="Times New Roman"><span style="font-size:10.0pt">-</span></font><font size="1"><span style="font-size:7.0pt">
</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">When I use -XX:+ParallelRefProcEnabled, performance is worse than not using this option. So, when I enable this, how many threads were used for this reference
processing (in a ratio of ParallelGCThreads and ConcGCThreads)?</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><br>
This is the strange part, and to me does not make sense. How id you determine that (1) there were lots of Reference objects (2) that a lot<br>
of time was spent in Reference processing during remark? If you run with -XX:+PrintGCDetails -XX:+PrintReferenceGC for both the<br>
cases (with and withouyt -XX:+ParallelRefProcEnabled), we would know what the relative numbers/times looked like and perhaps<br>
get closer to what the issue might be here. <o:p></o:p></span></font></p>
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<p style="margin-left:.5in"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></font><o:p></o:p></p>
<p><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">From further information, in one application, 100k-200k references were left to the remark phase, and in another they are 1.5m references.</span></font><o:p></o:p></p>
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May be this is the natural behaviour of your application? One thing we have found to help is if we mak good use of<br>
the survivor spaces, then sometimes these probles will go away because Reference objects get processed<br>
as they become eligible for processing in the young generation (therefore during minor GC's) and thus do not<br>
impose a large monolithic overhead during the less frequent major collections.<br>
<br>
-- ramki <o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Best,</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">-Nhan</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Srinivas Ramakrishna [mailto:<a href="mailto:ysr1729@gmail.com" target="_blank">ysr1729@gmail.com</a>]
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<b><span style="font-weight:bold">Sent:</span></b> Thursday, December 08, 2011 2:44 AM<br>
<b><span style="font-weight:bold">To:</span></b> Dang Nhan Nguyen<br>
<b><span style="font-weight:bold">Cc:</span></b> <a href="mailto:hotspot-gc-dev@openjdk.java.net" target="_blank">
hotspot-gc-dev@openjdk.java.net</a><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: Strange GC behaviour,</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"> <o:p></o:p></span></font></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Hi Nhan --<br>
<br>
Make sure you have the recent fix to Reference object processing when doing<br>
MT/Parallel marking with CMS; i don't have the CR handy, but the fix was pushed by<br>
Stefan not long ago. (The workaround was to disable parallel concurrent marking via<br>
-XX:-CMSConcurrentMTEnabled -- but of course the performance impact of that,<br>
depending on yr platform, might compromise yr benchmarking results.)<br>
<br>
More inline below:-<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">On Wed, Dec 7, 2011 at 2:20 PM, Dang Nhan Nguyen <<a href="mailto:nhann@chalmers.se" target="_blank">nhann@chalmers.se</a>>
wrote:<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Hi guys,
</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">I am benchmarking CMS collector and found it strange that
there are many objects left in remark phase.</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">When I check the issue again by only running foreground CMS
(I changed the source code a bit to force CMS running in foreground), so there is no promotion during collecting (so no objects marked during Preclean and Abortable Preclean phase). Even in this case, I found that there are still many objects left in remark
phase (in lusearch and tomcat in Dacapo benchmark, they are 10 times and 1/3 of number of objects marked in concmarking phase, while in suflow, they are just about 100 objects/refs). Most (maybe ALL) of these objects marked in remark phase were processed by
refProcessingWork(). In turn, this refProcessingWork() run in single thread mode. The performance was reduced a lot because of this.</span></font><o:p></o:p></p>
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-XX:+ParallelRefProcEnabled uses multiple threads to do that phase.<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">My questions are:</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">1. What kinds of references were processed by refProcessingWork()?
weak and soft ref? what are exactly they are?</span></font><o:p></o:p></p>
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all objects of type java.lang.ref.Reference (includes WeakReferencem=, SoftReference, FinalReference, PhantomReference).<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">2. While I only run CMS in stop-the-world, why are there
still many objects left to be processed by remark, in particular here is refProcessingWork()? Why aren't these references/objects processed in concurrent marking phase?</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><br>
I am not sure I understand the question. What do you mean by "run CMS in stop-the-world"? Note that Reference objects are processed<br>
by all kinds of collectors, young gen (minor) or whole heap (major), stop-world or concurrent. The volume of those objects may<br>
vary a bit between them based on the heap size, NewRatio etc.<br>
<br>
hope that helped.<br>
-- ramki<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> </span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Best,</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">-Nhan Nguyen</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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