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<p class="MsoNormal">Hi All, Attached GC log file for one our JVM process. Any idea why this is happening? It stopped after we restarted this process.<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">Following is our observation<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Any object allocation instruction is triggering a Full GC<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>As all object allocation (memory allocation) is done in Eden Space – for some reason fails continously.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>We could see 452 Full GC in 2 mins.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>In the attached log, we could see the below lines. What we notice is, YoungGen has 0K memory allocation, and alternatively we have 64K or so memory allocation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">2017-10-28T20:30:32.207+0000: 382100.678: [Full GC (Allocation Failure) [PSYoungGen: 0K->0K(253952K)] [ParOldGen: 146546K->146546K(348160K)] 146546K->146546K(602112K), [Metaspace:
45647K->45647K(1091584K)], 0.1865769 secs] [Times: user=0.87 sys=0.00, real=0.19 secs]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">2017-10-28T20:30:32.401+0000: 382100.872: [Full GC (Allocation Failure) [PSYoungGen: 160K->0K(253952K)] [ParOldGen: 146546K->146547K(348160K)] 146706K->146547K(602112K), [Metaspace:
45647K->45647K(1091584K)], 0.1871330 secs] [Times: user=0.88 sys=0.00, real=0.18 secs]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">2017-10-28T20:30:32.592+0000: 382101.064: [Full GC (Allocation Failure) [PSYoungGen: 0K->0K(253952K)] [ParOldGen: 146547K->146547K(348160K)] 146547K->146547K(602112K), [Metaspace:
45647K->45647K(1091584K)], 0.1852237 secs] [Times: user=0.88 sys=0.01, real=0.18 secs]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">2017-10-28T20:30:32.786+0000: 382101.257: [Full GC (Allocation Failure) [PSYoungGen: 192K->0K(253952K)] [ParOldGen: 146547K->146558K(348160K)] 146739K->146558K(602112K), [Metaspace:
45647K->45647K(1091584K)], 0.1879624 secs] [Times: user=0.89 sys=0.00, real=0.19 secs]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">2017-10-28T20:30:32.979+0000: 382101.450: [Full GC (Allocation Failure) [PSYoungGen: 0K->0K(253952K)] [ParOldGen: 146558K->146552K(348160K)] 146558K->146552K(602112K), [Metaspace:
45647K->45647K(1091584K)], 0.2331467 secs] [Times: user=1.15 sys=0.00, real=0.24 secs]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="background:aqua;mso-highlight:aqua">Exception in std_out:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif">java.lang.OutOfMemoryError: Java heap space<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif"> at java.nio.HeapByteBuffer.<init>(Unknown Source) ~[?:1.8.0_121]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Angsana New",serif"> at java.nio.ByteBuffer.allocate(Unknown Source) ~[?:1.8.0_121]
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Similar stack trace is also observed for a plain object allocation instructions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="background:aqua;mso-highlight:aqua">System Details:</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-size:14.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:14.0pt;font-family:"Angsana New",serif">Java HotSpot(TM) 64-Bit Server VM (25.121-b13) for linux-amd64 JRE (1.8.0_121-b13), built on Dec 12 2016 16:36:53 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-size:14.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:14.0pt;font-family:"Angsana New",serif">OS: Red Hat Enterprise Linux Server release 7.3 (Maipo)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thank You<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Rohit<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">GAN Development<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Office : +1-602-537-8983<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Mail To : <a href="mailto:rohit.mohta@aexp.com">
<span style="color:blue">rohit.mohta@aexp.com</span></a> <b><span style="color:#ED7D31">(Or ping in Slack)</span></b><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Location : </span>American Express Desert Ridge, OB2 – 3<sup>rd</sup> Floor Near C6, 18850 N 56<sup>th</sup> Street Phoenix, AZ 85054<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#538135">“if you can't explain it simply you don't understand it well enough” - Richard Feynman (maybe?)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#5B9BD5"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">*** AXP - INTERNAL ***<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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