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-------- Original Message --------
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
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<td>Re: Review Request (7u): JDK-8048271: Minor GC times
doubled from JDK 6u35 to JDK 7u51</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Tue, 15 Jul 2014 09:18:31 -0700</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Jon Masamitsu <a class="moz-txt-link-rfc2396E" href="mailto:jon.masamitsu@oracle.com"><jon.masamitsu@oracle.com></a></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td>Poonam Bajaj <a class="moz-txt-link-rfc2396E" href="mailto:poonam.bajaj@oracle.com"><poonam.bajaj@oracle.com></a></td>
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Poonam,<br>
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Code change looks fine.<br>
<br>
Reviewed.<br>
<br>
If possible the customer should test with jdk8 since this<br>
workaround will not help with jdk8. That will just let us<br>
know how bad the problem is in jdk8.<br>
<br>
Jon<br>
<br>
<div class="moz-cite-prefix">On 07/13/2014 05:47 PM, Poonam Bajaj
wrote:<br>
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<blockquote cite="mid:53C328A9.3070009@oracle.com" type="cite">
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Bug: <a moz-do-not-send="true" id="key-val" rel="4732892"
href="https://bugs.openjdk.java.net/browse/JDK-8048271">JDK-8048271</a>:
Minor GC times doubled from JDK 6u35 to JDK 7u51 <br>
Webrev: <a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://cr.openjdk.java.net/%7Epoonam/8048271/webrev.00/">http://cr.openjdk.java.net/~poonam/8048271/webrev.00/</a><br>
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<blockquote cite="mid:53C328A9.3070009@oracle.com" type="cite"> <br>
With JDK7, the minor GC collection times have increased as
compared to the collection times with JDK6uxx. These pauses have
increased due to the fact that the Intern strings and the class
statics were moved from PermGen to the Java Heap in JDK7 and,
are collected as part of the minor GC collections thus
contributing to the increase in GC times.<br>
<br>
These changes make the debug flag 'JavaObjectsInPerm' a
diagnostic flag so that it can be used to revert the PermGen
changes in jdk7 and get the earlier minor GC pause times.<br>
<br>
Testing:<br>
Manual testing comparing the PSYoungGen times with and without
JavaObjectsInPerm option<br>
JPRT<br>
<br>
<br>
Thanks,<br>
Poonam<br>
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