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Hello Joseph,<br>
<br>
From the GC logs, all the G1 evacuation pauses are under 100ms of
pause time goal. However, there are System.gc() invoked Full GCs
that are taking longer time.<br>
<pre><i>62.730: [GC pause (young), 0.02510300 secs]
...
64.287: [Full GC (System.gc()) 175M->98M(2048M), 0.2183040 secs]
[Times: user=0.26 sys=0.01, real=0.22 secs]
64.509: [Full GC (System.gc()) 98M->98M(2048M), 0.1928990 secs]
[Times: user=0.24 sys=0.00, real=0.20 secs]
64.704: [Full GC (System.gc()) 98M->98M(2048M), 0.1893760 secs]
[Times: user=0.25 sys=0.00, real=0.19 secs]
64.896: [Full GC (System.gc()) 98M->97M(2048M), 0.2001590 secs]
[Times: user=0.25 sys=0.00, real=0.20 secs]
65.098: [Full GC (System.gc()) 98M->97M(2048M), 0.1874640 secs]
[Times: user=0.24 sys=0.00, real=0.19 secs]
66.818: [Full GC (System.gc()) 185M->99M(2048M), 0.2137830 secs]
[Times: user=0.27 sys=0.00, real=0.22 secs] </i><i>
73.240: [GC pause (young), 0.02516600 secs]</i></pre>
Please check your application code to see if these System.gc()
invocations are intentional. You may also disable these using
-XX:+DisableExplicitGC option.<br>
<br>
Thanks,<br>
Poonam<br>
<br>
<div class="moz-cite-prefix">On 9/17/2015 6:02 AM, Joseph wrote:<br>
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<p class="MsoNormal">Hi ,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am Joseph. I am trying to tune
performance of our server .I run server with following g1 gc
options.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Maximum heap allocated to server is 5GB.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span class="value">“ -XX:+UseG1GC
-XX:MaxGCPauseMillis=100 -XX:ParallelGCThreads=4
-XX:InitiatingHeapOccupancyPercent=65
-XX:+ParallelRefProcEnabled -XX:-ResizePLAB
-Xloggc:/var/log/hbase/gc-hbase.log -XX:+PrintGCDetails
-XX:+PrintAdaptiveSizePolicy -XX:+PrintGCTimeStamps”</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The gc logs resulted with above gc flags
are attached with the mail.How to reduce garbage pause time in
our server.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you for your valuble time <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span
style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D">Regards,</span></b><span
style="font-size:12.0pt;font-family:
"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D">Joseph</span></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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