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<div class="moz-cite-prefix">Hi Paul,<br>
<br>
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<p class="MsoNormal">+ hotspot-gc-dev.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’d say that hsperfdata is the right place
to put detailed collector-specific data, and JMX the place to
put anything that might be generalized.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How far does anyone want to go with this? I
took a look at Azul’s GC-related MXBean docs<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a
href="http://docs.azul.com/zing/Zing_UserGuide/Zing_UserGuide/ZingMXBeans.htm"
moz-do-not-send="true">http://docs.azul.com/zing/Zing_UserGuide/Zing_UserGuide/ZingMXBeans.htm</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a
href="http://docs.azul.com/zing/ZingMXBeans_javadoc/"
moz-do-not-send="true">http://docs.azul.com/zing/ZingMXBeans_javadoc/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">which has good ideas in it, e.g.,
PauseDetails and a data collection interval concept. My
proposed getMaxPauseDuration() seems to be the same as the max
of Azul’s
GarbageCollectorMXBean.getLastGCDetails.getCollectorMaxPauseDetails().<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">A JEP might be in order. Opinions?<o:p></o:p></p>
</div>
</blockquote>
I like the idea of publishing GC pause info via JMX. Yes I think it
makes sense to draft up a JEP about it.<br>
<br>
Roman<br>
<br>
<br>
<br>
<blockquote type="cite"
cite="mid:DC434A34-F403-4009-9F68-906D05CCF248@amazon.com">
<div class="WordSection1">
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Paul<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:12.0pt;color:black">From: </span></b><span
style="font-size:12.0pt;color:black">Jeremy Manson
<a class="moz-txt-link-rfc2396E" href="mailto:jeremymanson@google.com"><jeremymanson@google.com></a><br>
<b>Date: </b>Monday, October 23, 2017 at 11:50 AM<br>
<b>To: </b>"Hohensee, Paul" <a class="moz-txt-link-rfc2396E" href="mailto:hohensee@amazon.com"><hohensee@amazon.com></a>,
Derek Thomson <a class="moz-txt-link-rfc2396E" href="mailto:dthomson@google.com"><dthomson@google.com></a>, Wessam
Hassanein <a class="moz-txt-link-rfc2396E" href="mailto:wessam@google.com"><wessam@google.com></a>, Man Cao
<a class="moz-txt-link-rfc2396E" href="mailto:manc@google.com"><manc@google.com></a><br>
<b>Cc: </b><a class="moz-txt-link-rfc2396E" href="mailto:serviceability-dev@openjdk.java.net">"serviceability-dev@openjdk.java.net"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:serviceability-dev@openjdk.java.net"><serviceability-dev@openjdk.java.net></a><br>
<b>Subject: </b>Re: GcInfo: longest pause duration?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Yes, this information is useful. <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">We've done a couple of things to get at
it, which folks might find interesting.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">1) We extended the hsperfdata to
include a large number of stats for CMS. Parsing
hsperfdata is ridiculously easy, and hasn't changed in
years, so we just parse it directly and report the values
to monitoring tools. I'm too lazy to retype what we
export, so are the relevant CMS variables from our code;
what they do should be relatively obvious:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<pre style="outline:none" id="gmail-c1"><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _concurrent_mode_failure_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"concurrent-mode-failure-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _concurrent_mode_failure_due_to_fragmentation_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"concurrent-mode-failure-due-to-fragmentation-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _concurrent_mode_failure_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"concurrent-mode-failure-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_initial_mark_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"<b><span style="background:white">cms-initial-mark-count</span></b>"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_initial_mark_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-initial-mark-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_remark_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-remark-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_remark_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-remark-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_full_gc_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-full-gc-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_full_gc_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-full-gc-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_compacting_full_gc_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-compacting-full-gc-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_compacting_full_gc_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-compacting-full-gc-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_noncompacting_full_gc_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-noncompacting-full-gc-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_noncompacting_full_gc_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-noncompacting-full-gc-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_mark_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-mark-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_mark_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-mark-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_preclean_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-preclean-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_preclean_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-preclean-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_abortable_preclean_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-abortable-preclean-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_abortable_preclean_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-abortable-preclean-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_sweep_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-sweep-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_sweep_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-sweep-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_reset_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-reset-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_conc_reset_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-conc-reset-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_collection_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-collection-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_collection_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-collection-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_ref_proc_count =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-ref-proc-count"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Events, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _cms_ref_proc_time =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_counter(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"cms-ref-proc-time"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_Ticks, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"><o:p> </o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _yg_alloc_bytes =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_variable(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"jvm-gc-cms-young-gen-alloc-bytes"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_None, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _yg_promo_bytes =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_variable(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"jvm-gc-cms-young-gen-promo-bytes"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_None, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _og_direct_alloc_bytes =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_variable(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"jvm-gc-cms-old-gen-directalloc-bytes"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_None, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _og_alloc_bytes =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_variable(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"jvm-gc-cms-old-gen-alloc-bytes"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_None, CHECK);<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> _total_alloc_bytes =<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfDataManager::create_variable(NULL_NS, </span></span><span class="gmail-stx-string"><span style="font-size:13.5pt;color:#008800">"jvm-gc-cms-total-alloc-bytes"</span></span><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black">,<o:p></o:p></span></span></pre>
<pre><span class="gmail-stx-line"><span style="font-size:13.5pt;color:black"> PerfData::U_None, CHECK);</span></span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></pre>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">2) We also implemented an API built on
JFR's handling of GC events. We use it to export the GC
history to monitoring tools in a format that doesn't
involve parsing logs that can change.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">(Prior to JFR, we had a bespoke
implementation where we instrumented everywhere a log
happened, but we fortunately don't have to do that
anymore.)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">We'd love both of these things to be
something that was more generally usable.<o:p></o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Jeremy<o:p></o:p></p>
</div>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Mon, Oct 23, 2017 at 9:31 AM,
Hohensee, Paul <<a href="mailto:hohensee@amazon.com"
target="_blank" moz-do-not-send="true">hohensee@amazon.com</a>>
wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’d
like to solicit opinions on reporting GC pause
duration (stopped-world pause time) via JMX. This
info would be useful in figuring out whether or not
GC pause times are factors in failing to meet
response time SLAs. The info is of course available
directly from GC logs, but parsing logs is fraught
and JMX doesn’t seem to report the equivalent info.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">GcInfo<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a
href="https://docs.oracle.com/javase/9/docs/api/com/sun/management/GcInfo.html"
target="_blank" moz-do-not-send="true">https://docs.oracle.com/javase/9/docs/api/com/sun/management/GcInfo.html</a><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">has
a getDuration() method which works fine for the
non-concurrent collectors (since they’re STW), but
for CMS and G1 it appears to report the duration of
an entire concurrent cycle, which isn’t what I want.
The number of STW pauses during a concurrent cycle
varies by collector, so ideally there would be a
method that reports cause (as a string) and duration
for each STW pause. If that’s too much, perhaps the
minimum might be a getMaxPauseDuration() method that
reports the maximum pause duration of all the STW
pauses that happen during a concurrent cycle.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Relatedly,
the full compacting GCs that happen as a result of
CMS and G1 concurrent mode failure aren’t reported
separately from concurrent cycles. It would be
useful to differentiate these from
“ConcurrentMarkSweep” and “G1 Old Generation”.
Perhaps add collector types to CMS and G1, vis.
“MarkSweepCompact” (which already exists and is
literally what’s executed by CMS) and a new “G1
MarkSweepCompact” collector for G1.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If
there’s a consensus that something should be done
about either of these issues, I’d be happy to file
RFE(s) and do the work.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#888888"> <o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#888888">Paul<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#888888"> <o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</blockquote>
<p><br>
</p>
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