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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066">Replied inline.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ruslan Synytsky [mailto:synytskyy@jelastic.com]
<br>
<b>Sent:</b> Friday, June 1, 2018 9:22 PM<br>
<b>To:</b> Sunny Chan, CLSA <sunny.chan@clsa.com><br>
<b>Cc:</b> rbruno@gsd.inesc-id.pt; hotspot-gc-dev@openjdk.java.net; synytskyy@jelastic.com<br>
<b>Subject:</b> Re: Question regarding JEP 8204089 Timely Reducing Unused Committed Memory<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Sunny.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 1 June 2018 at 07:36, Sunny Chan, CLSA <<a href="mailto:sunny.chan@clsa.com" target="_blank">sunny.chan@clsa.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066">Hello,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066">I have a number of question about the proposed changes for the JEP and I would like to make the following suggestions and comments</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066"> </span><o:p></o:p></p>
<p class="gmail-m8745783528212801861m2288746132458318163msolistparagraph"><span style="color:#000066">1)</span><span style="font-size:7.0pt;color:#000066">
</span><span style="color:#000066">Are we planning to make this change the default behavior for G1? Or this is an optional switch for people who runs in a container environment?</span><o:p></o:p></p>
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<p class="MsoNormal">Optional. It will be enough for beginning.<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066">You say “enough for the beginning” – do you want to change them to be the default at some point?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066">Please document this in the JEP and highlight that this is optional.<o:p></o:p></span></p>
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<p class="gmail-m8745783528212801861m2288746132458318163msolistparagraph"><span style="color:#000066">2)</span><span style="font-size:7.0pt;color:#000066">
</span><span style="color:#000066">In a trading systems, sometimes there are period of quiescence and then suddenly a burst of activity towards market close or market event. The loadavg you suggest to “monitor” the activity in the system only reports up to
14mins and it might not necessary a good measure for this type of applications, especially you would trigger a Full GC</span><o:p></o:p></p>
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<p class="MsoNormal">I'm sure certain number of workloads can't afford it. Such kind of projects or other mission critical environments simply should not use this option. <o:p></o:p></p>
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<p class="gmail-m8745783528212801861m2288746132458318163msolistparagraph"><span style="color:#000066">3)</span><span style="font-size:7.0pt;color:#000066">
</span><span style="color:#000066">You haven’t fill in the details for “The GCFrequency value is ignored and therefore, i.e., no full collection is triggered, if:”</span><o:p></o:p></p>
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<p class="MsoNormal">Thanks. It's a missed part. Here are the "if" rules: <o:p></o:p></p>
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GCFrequency is zero or below<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3;vertical-align:baseline;font-variant-numeric:normal;font-variant-east-asian:normal">
the average load on the host system is above MaxLoadGC. The MaxLoadGC is a dynamically user-defined variable. This check is ignored if MaxLoadGC is zero or below<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3;vertical-align:baseline;font-variant-numeric:normal;font-variant-east-asian:normal">
the committed memory is above MinCommitted bytes. MinCommitted is a dynamically user-defined variable. This check is ignored if MinCommitted is zero or below<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3;vertical-align:baseline;font-variant-numeric:normal;font-variant-east-asian:normal">
the difference between the current heap capacity and the current heap usage is below MaxOverCommitted bytes. The MaxOverCommitted is a dynamically user-defined variable. This check is ignored if MaxOverCommitted is zero or below <o:p></o:p></li></ul>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The doc will be updated.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#000066">4)</span><span style="font-size:7.0pt;color:#000066">
</span><span style="color:#000066">If we are trigging full GC with this we should make sure the GC reason is populated and log properly in the GC log so we can track it down.</span><o:p></o:p></p>
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<p class="MsoNormal">Good point. <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066">I would like to see this as a goal in the JEP, and this should be clearly documented how people can track down GC caused by the flag.<o:p></o:p></span></p>
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<p class="gmail-m8745783528212801861m2288746132458318163msolistparagraph"><span style="color:#000066">5)</span><span style="font-size:7.0pt;color:#000066">
</span><span style="color:#000066">I have not heard of J9 Gencon/Shenandoah providing similar functionality. Can you point me to further documentation on which feature you model upon?</span><o:p></o:p></p>
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<p class="MsoNormal"><span class="gmail-il"><span style="font-family:"Arial",sans-serif;color:#222222">What we know so far that OpenJ9</span></span><span style="font-family:"Arial",sans-serif;color:#222222;background:white"> provides </span><o:p></o:p></p>
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<a href="https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/com.ibm.java.vm.80.doc/docs/xxidletuningcompactonidle.html" target="_blank">-XX:+IdleTuningCompactOnIdle</a> - this option controls garbage collection processing with compaction when the status
of the JVM is set to idle<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo6">
and <a href="https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/com.ibm.java.vm.80.doc/docs/xsoftmx.html" target="_blank">-Xsoftmx</a> - this option sets a "soft" maximum limit for the initial size of the Java™ heap. <o:p></o:p></li></ul>
<p class="MsoNormal">We have not tested it yet, but the idea looks similar. Do we have anyone in the group involved in OpenJ9 to confirm or refute this statement? <span style="color:#000066"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000066"><o:p> </o:p></span></p>
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<p class="MsoNormal">Thank you<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066">Thanks.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#000066"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<b><span style="font-size:9.0pt;line-height:110%;color:#000066">Sunny Chan</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<b><span style="font-size:9.0pt;line-height:110%;color:#000066">Senior Lead Engineer, Executive Services</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<span style="font-size:9.0pt;line-height:110%;color:#000066">D +852 2600 8907 | M +852 6386 1835 | T +852 2600 8888</span><o:p></o:p></p>
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<span style="font-size:9.0pt;line-height:110%;color:#000066">5/F, One Island East,
</span><a href="https://maps.google.com/?q=18+Westlands+Road&entry=gmail&source=g" target="_blank"><span style="font-size:9.0pt;line-height:110%">18 Westlands Road</span></a><span style="font-size:9.0pt;line-height:110%;color:#000066">, Island East, Hong Kong</span><o:p></o:p></p>
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<span style="font-size:9.0pt;line-height:110%;color:#000066"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://hk.linkedin.com/company/clsa" target="_blank"><span style="font-size:9.0pt;color:#000066;letter-spacing:.5pt;text-decoration:none"><img border="0" width="26" height="26" style="width:.2708in;height:.2708in" id="gmail-m_8745783528212801861m_2288746132458318163Picture_x0020_6" src="cid:image001.png@01D3FBEA.AC6F7120" alt=":1. Social Media Icons:CLSA_Social Media Icons_linkedin.png"></span></a><a href="https://twitter.com/clsainsights?lang=en" target="_blank"><span style="font-size:9.0pt;color:#000066;letter-spacing:.5pt;text-decoration:none"><img border="0" width="26" height="26" style="width:.2708in;height:.2708in" id="gmail-m_8745783528212801861m_2288746132458318163Picture_x0020_5" src="cid:image002.png@01D3FBEA.AC6F7120" alt=":1. Social Media Icons:CLSA_Social Media Icons_twitter.png"></span></a><a href="https://www.youtube.com/channel/UC0qWp_lLnOcRYmBlCNQgZKA" target="_blank"><span style="font-size:9.0pt;color:#000066;letter-spacing:.5pt;text-decoration:none"><img border="0" width="26" height="26" style="width:.2708in;height:.2708in" id="gmail-m_8745783528212801861m_2288746132458318163Picture_x0020_4" src="cid:image003.png@01D3FBEA.AC6F7120" alt=":1. Social Media Icons:CLSA_Social Media Icons_youtube.png"></span></a><a href="https://www.facebook.com/clsacommunity/" target="_blank"><span style="font-size:9.0pt;color:#000066;letter-spacing:.5pt;text-decoration:none"><img border="0" width="25" height="26" style="width:.2604in;height:.2708in" id="gmail-m_8745783528212801861m_2288746132458318163Picture_x0020_3" src="cid:image004.png@01D3FBEA.AC6F7120" alt=":1. Social Media Icons:CLSA_Social Media Icons_facebook.png"></span></a><o:p></o:p></p>
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<span style="font-size:9.0pt;line-height:110%;color:#000066"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<a href="https://www.clsa.com/" target="_blank"><b><span style="font-size:9.0pt;line-height:110%;color:#000066;text-decoration:none">clsa.com</span></b></a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<b><span style="font-size:9.0pt;line-height:110%;color:#000066">Insights. Liquidity. Capital.
</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<b><span style="font-size:8.0pt;line-height:110%;color:#000066"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<a href="https://www.clsa.com/member" target="_blank"><span style="color:#000066;text-decoration:none"><img border="0" width="131" height="61" style="width:1.3645in;height:.6354in" id="gmail-m_8745783528212801861m_2288746132458318163Picture_x0020_8" src="cid:image005.png@01D3FBEA.AC6F7120" alt="CLSA_RGB"></span></a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:110%">
<b><span style="font-size:8.0pt;line-height:110%;color:#000066"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:9.0pt;color:#000066">A CITIC Securities Company</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#000066">The content of this communication is intended for the recipient and is subject to CLSA Legal and Regulatory Notices.<br>
These can be viewed at </span><a href="https://www.clsa.com/disclaimer.html" target="_blank"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#000066">https://www.clsa.com/disclaimer.html</span></a><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#000066">
or sent to you upon request.</span><span style="font-size:8.0pt;font-family:"Verdana",sans-serif"><br>
</span><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:#00A351">Please consider before printing. CLSA is ISO14001 certified and committed to reducing its impact on the environment.</span><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif">Ruslan<br>
CEO @ </span><a href="https://jelastic.com/" target="_blank"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:#1155CC">Jelastic</span></a><span style="font-size:9.5pt"><o:p></o:p></span></p>
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<P><span style="FONT-SIZE: 8pt; FONT-FAMILY: 'Verdana',sans-serif; mso-bidi-font-family: Arial"><span style='FONT-SIZE: 8pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #000066; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA'>The content of this communication is intended for the recipient and is subject to CLSA Legal and Regulatory Notices.<br><span style='FONT-SIZE: 8pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #000066; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA'>These can be viewed at </span><span style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #000066; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA'><A href="https://www.clsa.com/disclaimer.html"><span style="FONT-SIZE: 8pt; COLOR: #000066">https://www.clsa.com/disclaimer.html</span></A></span><span style='FONT-SIZE: 8pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #000066; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA'> or sent to you upon request.</span></span><br></span><span><span style='FONT-SIZE: 8pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #00a351; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA'>Please consider before printing. CLSA is ISO14001 certified and committed to reducing its impact on the environment.</span></span></P></body>
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