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<div class="moz-cite-prefix">On 3/11/2016 8:12 AM, Tony Printezis
wrote:<br>
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<blockquote cite="mid:etPan.56e2ee79.7536fac9.207@tw-mbp-tprintezis"
type="cite">
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<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; color:
rgba(0,0,0,1.0); margin: 0px; line-height: auto;">Thanks for the
heads up Jungwoo. I think it should be straightforward to decide
whether to unload classes for a particular CMS cycle based on
the rate at which the meatspace occupancy is growing. Has anyone
considered / looked into this?</div>
</blockquote>
<br>
No one has looked at this to my knowledge.<br>
<br>
Jon<br>
<br>
<blockquote cite="mid:etPan.56e2ee79.7536fac9.207@tw-mbp-tprintezis"
type="cite">
<div id="bloop_customfont"
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<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; color:
rgba(0,0,0,1.0); margin: 0px; line-height: auto;">Tony</div>
<br>
<p class="airmail_on">On March 10, 2016 at 7:07:00 PM, Jungwoo Ha
(<a moz-do-not-send="true" href="mailto:jwha@google.com">jwha@google.com</a>)
wrote:</p>
<blockquote type="cite" class="clean_bq"><span>
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<title></title>
<div dir="ltr">We've been disabled CMSClassUnloading for a
long
time and had no issues.
<div>We recently turned it back on by default with
CMSClassUnloadingMaxInterval=5, which amortizes the
increased
remark cost.<br>
<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Mar 10, 2016 at 1:32
PM, Tony
Printezis <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:tprintezis@twitter.com"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:tprintezis@twitter.com">tprintezis@twitter.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">Hi
all,</div>
<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br>
</div>
<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">CMSClassUnloadingEnabled
is enabled by default in JDK 8. Most of
our services do not require class unloading
(they load a bunch of
classes up-front and that’s it) so we’re
thinking of turning it off
by default in our JDK as it increases our remark
times by a
non-trivial amount (40-90ms depending on the
service). Any known
issues with running with
-XX:-CMSClassUnloadingEnabled? (This is a
veiled way to ask: is anyone testing with that
flag off?)</div>
<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br>
</div>
<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">Thanks,</div>
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style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br>
</div>
<div
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">Tony</div>
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<div>-----</div>
<div><br>
</div>
<div>Tony Printezis | JVM/GC Engineer / VM
Team | Twitter</div>
<div><br>
</div>
<div>@TonyPrintezis</div>
<div><a moz-do-not-send="true"
href="mailto:tprintezis@twitter.com"
target="_blank">tprintezis@twitter.com</a></div>
<div><br>
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--<br>
<div class="gmail_signature">
<div dir="ltr">
<div><span style="font-size:12.8000001907349px">Jungwoo
Ha | Java
Platform Team | <a moz-do-not-send="true"
href="mailto:jwha@google.com" target="_blank">jwha@google.com</a></span><br>
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<div id="bloop_sign_1457712622265373952" class="bloop_sign">
<div style="font-family:helvetica,arial;font-size:13px">
<div>-----</div>
<div><br>
</div>
<div>Tony Printezis | JVM/GC Engineer / VM Team | Twitter</div>
<div><br>
</div>
<div>@TonyPrintezis</div>
<div><a moz-do-not-send="true"
href="mailto:tprintezis@twitter.com">tprintezis@twitter.com</a></div>
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