<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">OK, will do (6 new cmd line args now… I’m loving it!)</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">BTW, would anyone object if I change ParGCCardsPerStrideChunk from intx to uintx? (it really should not be negative…)</div> <br><p class="airmail_on" style="color:#000;">On June 18, 2015 at 3:24:56 PM, Jon Masamitsu (<a href="mailto:jon.masamitsu@oracle.com">jon.masamitsu@oracle.com</a>) wrote:</p> <blockquote type="cite" class="clean_bq"><span><div bgcolor="#FFFFFF" text="#000000"><div></div><div>
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<br>
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<div class="moz-cite-prefix">On 06/18/2015 11:49 AM, Tony Printezis
wrote:<br></div>
<blockquote cite="mid:etPan.558312b6.f5484f4.1215a@tw-mbp-tprintezis" type="cite">
<div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">
Jon,</div>
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<br></div>
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Inline.</div>
<br>
<p class="airmail_on" style="color:#000;">On June 18, 2015 at
1:22:47 PM, Jon Masamitsu (<a moz-do-not-send="true" href="mailto:jon.masamitsu@oracle.com">jon.masamitsu@oracle.com</a>)
wrote:</p>
<div>
<blockquote type="cite" class="clean_bq" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
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<div><span><br>
<br></span>
<div class="moz-cite-prefix"><span>On 06/18/2015 06:27 AM, Tony
Printezis wrote:<br></span></div>
<blockquote cite="mid:etPan.5582c73a.34c1b65a.1215a@tw-mbp-tprintezis" type="cite">
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<span>Hi Jon,</span></div>
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<span><br></span></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<span>Thanks for looking at it. I can definitely add an additional
bool flag to turn it on or off. I think it will also make sense to
make it manageable so that we can switch the auto-tuning on / off
dynamically, if necessary.</span></div>
</blockquote>
<span><br>
Thanks.<br>
<br>
When you were doing the performance testing, did you have some type
of logging<br>
so that you could see the cards-per-stride-chunk that was being
used? <span class="Apple-converted-space"> </span></span></div>
</div>
</blockquote>
</div>
<p><br></p>
<p>Yes, I had ad-hoc output for that.</p>
<p><br></p>
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<div><span>Eventually<br>
someone is going to ask for it so if you had something succinct I'd
be glad to see it<br>
included in this push.</span></div>
</div>
</blockquote>
</div>
<p><br></p>
<p>I think it’d be helpful, but I’d be apprehensive adding more GC
log output that will mess up GC logs even more. :-) Any suggestions
on maybe some existing output I could piggy-back this on?</p>
</div>
</blockquote>
<br>
Add the logging under (yet another) flag. We're trying to
move to the new logging format and doing<br>
so will likely reduce such concerns. I'd like something there
to be converted to the new format.<br>
<br>
Thanks.<br>
<br>
Jon<br>
<br>
<blockquote cite="mid:etPan.558312b6.f5484f4.1215a@tw-mbp-tprintezis" type="cite">
<div>
<p>Tony</p>
<p><br></p>
<div>
<blockquote type="cite" class="clean_bq" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
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<div><span><br>
Jon<br></span>
<blockquote cite="mid:etPan.5582c73a.34c1b65a.1215a@tw-mbp-tprintezis" type="cite">
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
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<span>Tony</span></div>
<span><br></span>
<p class="airmail_on" style="color: rgb(0, 0, 0);"><span>On June
17, 2015 at 9:46:16 PM, Jon Masamitsu (<a moz-do-not-send="true" href="mailto:jon.masamitsu@oracle.com">jon.masamitsu@oracle.com</a>)
wrote:</span></p>
<blockquote type="cite" class="clean_bq">
<div bgcolor="#FFFFFF" text="#000000">
<div><span><span>Tony,<br>
<br>
I'm still studying the patch but would you consider a more
explicit<br>
flag to turn this on and off? What you have is very
reasonable but<br>
if the performance team sees some regression, it would be
easier<br>
for them to turn the feature on or off rather than go look for the
value<br>
of<span class="Apple-converted-space"> </span><span class="new">ParGCCardsPerStrideChunk</span><span class="Apple-converted-space"> </span>that is the default and then
put that<br>
on the command line. Same would be true for a customer who
has<br>
an application operating in one of the corners where the
performance<br>
is worse.<br>
<br>
Jon<br>
<br></span></span>
<div class="moz-cite-prefix">On 6/17/2015 3:30 PM, Tony Printezis
wrote:<br></div>
<blockquote cite="mid:etPan.5581f51b.699a1ea0.1215a@tw-mbp-tprintezis" type="cite">
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
Hi all,</div>
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<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
A small patch for your consideration:</div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<a moz-do-not-send="true" href="http://cr.openjdk.java.net/%7Etonyp/8086056/webrev.0/">http://cr.openjdk.java.net/~tonyp/8086056/webrev.0/</a></div>
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<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
(BTW, for some reason some of the webrev output is a bit messed up.
Not sure why, maybe some hg incompatibility I guess. The diffs look
OK though. I also attached the patch to this e-mail.)</div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
There’s a bit of info on the JIRA on the rationale for the
patch:</div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<a moz-do-not-send="true" href="https://bugs.openjdk.java.net/browse/JDK-8086056">https://bugs.openjdk.java.net/browse/JDK-8086056</a></div>
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<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
The min / max values for the old gen capacity
and ParGCCardsPerStrideChunk were chosen empircally after
running a few (mostly synthetic tests) on Linux x64. If someone has
the cycles to do a more extensive performance study, I’d be happy
to revise them accordingly.</div>
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<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
Regards,</div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
<br></div>
<div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; color: rgb(0, 0, 0); margin: 0px;">
Tony</div>
<br>
<div id="bloop_sign_1434579909530055936" 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>
<div><br></div>
</div>
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</blockquote>
<br></div>
</div>
</blockquote>
<div id="bloop_sign_1434633343182564864" 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>
<div><br></div>
</div>
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</blockquote>
<br></div>
</div>
</blockquote>
<br class="Apple-interchange-newline"></div>
<br class="Apple-interchange-newline"></div>
<div id="bloop_sign_1434652180236058112" 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>
<div><br></div>
</div>
</div>
</blockquote>
<br>
</div></div></span></blockquote> <div id="bloop_sign_1434655740339667200" 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 href="mailto:tprintezis@twitter.com">tprintezis@twitter.com</a></div><div><br></div></div></div></body></html>