<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Not sure what the G1 would do with an initiating occupancy value of 0.<div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "> size_t marking_initiating_used_threshold =</div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "> (_g1->capacity() / <span style="color: #272ad8">100</span>) * InitiatingHeapOccupancyPercent;</div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><br></div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><span style="font-family: Helvetica; font-size: medium; ">I didn't dig much deeper into the code to see how 0 was handled.</span></div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><span style="font-family: Helvetica; font-size: medium; "><br></span></div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><span style="font-family: Helvetica; font-size: medium; ">Regards,</span></div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><span style="font-family: Helvetica; font-size: medium; ">Kirk</span></div><div style="margin: 0px; font-size: 11px; font-family: Menlo; "><span style="font-family: Helvetica; font-size: medium; "><br></span></div><div><div>On 2012-10-19, at 7:13 AM, csewhiz <<a href="mailto:csewhiz@zoho.com">csewhiz@zoho.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta content="text/html;charset=UTF-8" http-equiv="Content-Type"><div><div style="font-size:10pt;font-family:Verdana,Arial,Helvetica,sans-serif;"><div>Hello All,</div>
<div> Sorry for posting this question in this mailing list. I am unable to find any answer for this. I am trying to tune our application for G1GC as we need very small pauses Below 500msec. </div>
<div> But the problem is when we are runing with G1GC (under jdk 6_u37) Old generation of garbage collection only happening when it is reaching the Max GC size I noticed on jdk 6U 37 if max heap size is 1GB then it is close to 1sec 2GB close to 2 sec pauses. </div>
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<div> Is there any parameter to force the old gc happening regularly. </div>
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<div>I am trying following setting, </div>
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<div>-Xms1280M -Xmx1280M -XX:+UseG1GC -XX:MaxTenuringThreshold=15 -XX:SurvivorRatio=8 -XX:NewRatio=1 -XX:GCPauseIntervalMillis=7500 -XX:MaxGCPauseMillis=500 -XX:InitiatingHeapOccupancyPercent=0 -XX:ParallelGCThreads=7 -XX:ConcGCThreads=7 </div>
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<div>If anyone can give insight on how full GC is triggred internals will be of great help.</div>
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<div>PS: I have tried without any option for G1 but not of much help hence .. this one trying to be agressive ? but of not much help.</div>
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<div>Regards,</div>
<div>Soumit<br><br></div></div></div></blockquote></div><br></div></body></html>