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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">
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        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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        style="font-family:Helvetica,Arial;font-size:13px; color:
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      <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>
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                <br>
                <div class="moz-cite-prefix">On 06/18/2015 06:27 AM,
                  Tony Printezis wrote:<br>
                </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;">Hi Jon,</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;">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.</div>
                </blockquote>
                <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></div>
            </div>
          </span></blockquote>
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      <p><br>
      </p>
      <p>Yes, I had ad-hoc output for that.</p>
      <p><br>
      </p>
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            0, 0); font-family: Helvetica, Arial; font-size: 13px;
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                <div>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.</div>
              </div>
            </span></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>
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                <div><br>
                  Jon<br>
                  <blockquote
                    cite="mid:etPan.5582c73a.34c1b65a.1215a@tw-mbp-tprintezis"
                    type="cite">
                    <div id="bloop_customfont" style="font-family:
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                    <div id="bloop_customfont" style="font-family:
                      Helvetica, Arial; font-size: 13px; color: rgb(0,
                      0, 0); margin: 0px;">Tony</div>
                    <br>
                    <p class="airmail_on" style="color: rgb(0, 0, 0);">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:</p>
                    <blockquote type="cite" class="clean_bq">
                      <div bgcolor="#FFFFFF" text="#000000">
                        <div><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>
                          <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>
                            <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 small patch for your
                              consideration:</div>
                            <div id="bloop_customfont"
                              style="font-family: Helvetica, Arial;
                              font-size: 13px; color: rgb(0, 0, 0);
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                            </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>
                            <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;">(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);
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                            </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;
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                            </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>
                            <div id="bloop_customfont"
                              style="font-family: Helvetica, Arial;
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                              margin: 0px;"><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>
                            <div id="bloop_customfont"
                              style="font-family: Helvetica, Arial;
                              font-size: 13px; color: rgb(0, 0, 0);
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                            </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"
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                            </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>
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                          </blockquote>
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                    </blockquote>
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                      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>
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            </span></blockquote>
          <br class="Apple-interchange-newline">
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        <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>
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