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<div class="moz-cite-prefix">On 06/18/2015 01:19 PM, Tony Printezis
wrote:<br>
</div>
<blockquote
cite="mid:etPan.558327c0.14304d40.1215a@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;">Jon,</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;">Is something
like this OK?</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>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">3.499:
#4: [GC (Allocation Failure) 3.499: #4: [ParNew
[ParGCCardsPerStrideChunk: 8192 old_capacity: 18350080K
old_capacity_bounds: 1048576K-16777216K stride_size_bounds:
256-8192] : 471872K->52416K(471872K), 0.4452353 secs]
1165095K->921874K(18821952K), 0.4453562 secs] [Times:
user=7.20 sys=0.03 real=0.45 secs]</p>
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<br>
That looks good. <br>
<br>
<blockquote
cite="mid:etPan.558327c0.14304d40.1215a@tw-mbp-tprintezis"
type="cite">
<p class="airmail_on" style="color:#000;">On June 18, 2015 at
3:30:02 PM, Tony Printezis (<a moz-do-not-send="true"
href="mailto:tprintezis@twitter.com">tprintezis@twitter.com</a>)
wrote:</p>
<blockquote type="cite" class="clean_bq"><span>
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<title></title>
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OK, will do (6 new cmd line args now… I’m loving it!)</div>
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style="font-family:Helvetica,Arial;font-size:13px;
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<br>
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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;">
BTW, would anyone object if I change
ParGCCardsPerStrideChunk from
intx to uintx? (it really should not be negative…)</div>
</div>
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</span></blockquote>
</blockquote>
We have some argument checking code that is going in soon so though
changing to uintx is the right thing,<br>
not right now.<br>
<br>
Jon<br>
<br>
<blockquote
cite="mid:etPan.558327c0.14304d40.1215a@tw-mbp-tprintezis"
type="cite">
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<p class="airmail_on" style="color:#000;">On June 18, 2015
at
3:24:56 PM, Jon Masamitsu (<a moz-do-not-send="true"
href="mailto:jon.masamitsu@oracle.com">jon.masamitsu@oracle.com</a>)
wrote:</p>
<blockquote type="cite" class="clean_bq">
<div bgcolor="#FFFFFF" text="#000000">
<div><span><br>
<br>
</span>
<div class="moz-cite-prefix"><span>On 06/18/2015
11:49 AM, Tony
Printezis wrote:<br>
</span></div>
<blockquote
cite="mid:etPan.558312b6.f5484f4.1215a@tw-mbp-tprintezis"
type="cite">
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style="font-family:Helvetica,Arial;font-size:13px;
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<span>Jon,</span></div>
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style="font-family:Helvetica,Arial;font-size:13px;
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<span><br>
</span></div>
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<span>Inline.</span></div>
<span><br>
</span>
<p class="airmail_on" style="color:#000;"><span>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:</span></p>
<div>
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<div><span><span><br>
<br>
</span></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">
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<span>Hi Jon,</span></div>
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<span><br>
</span></div>
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<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>
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<div><span><br>
Jon<br>
</span>
<blockquote
cite="mid:etPan.5582c73a.34c1b65a.1215a@tw-mbp-tprintezis"
type="cite">
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style="font-family: Helvetica,
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<span><br>
</span></div>
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style="font-family: Helvetica,
Arial; font-size: 13px; color:
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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"
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Hi all,</div>
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<br>
</div>
<div id="bloop_customfont"
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A small patch for your
consideration:</div>
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<br>
</div>
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<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>
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(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>
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<br>
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There’s a bit of info on the
JIRA on the rationale for
the
patch:</div>
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<br>
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<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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style="font-family:
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<br>
</div>
<div id="bloop_customfont"
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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"
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Regards,</div>
<div id="bloop_customfont"
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<br>
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<div id="bloop_customfont"
style="font-family:
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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>
</div>
</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>
</div>
</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>
</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 moz-do-not-send="true"
href="mailto:tprintezis@twitter.com">tprintezis@twitter.com</a></div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</span></blockquote>
<div id="bloop_sign_1434658721516584960" 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>
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