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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Hey everyone, <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">We performed an analysis of Loom's impact on Win/ARM64 and found only one test that can be attributed to the VirtualThreads preview commit. That test is, </span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">jdk/jshell/ToolBasicTest.java
(langtools: tier2). I've included more details about our testing below. </span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">There are currently no blockers for the JDK 19 release. Please let us know what you think. </span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">Thanks,</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
</div>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Ahmed Muhsin
</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><br>
<br>
</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<div>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<div>
<p class="MsoNormal" style="background:white"><strong><span style="font-size:12.0pt;font-family:"inherit",serif;color:black">Test procedure and results:</span></strong><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p> </o:p></span></p>
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<div>
<p class="MsoNormal" style="background:white"><u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">Tests</span></u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">:
<o:p></o:p></span></p>
</div>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">JDK: tier1, tier2, tier3, jdk_loom
<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Hotspot: tier1, tier2, tier3, hotspot_loom<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Langtools: tier1, tier2, tier3<o:p></o:p></span></li></ul>
<div>
<p class="MsoNormal" style="background:white"><u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">Comparison 1: JDK tip (commit:
<a href="https://urldefense.com/v3/__https://github.com/openjdk/jdk/commit/e0382c552348d108e906792ad8ca7067f9f805ec__;!!ACWV5N9M2RV99hQ!Om_5WP1WqudVvl8iV8DDs9YrDhbHLmbrCPBW_EI-oiS4DDIRfmEBpkqQtwES26qtikN5DFtyXWVQYc7zYy-tXqHMa5M$">
e0382c5</a>) - VritualThreads on vs off</span></u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
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<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Result: Turning VirtualThreads on led to 5 new jtreg test failures:
<o:p></o:p></span></li></ul>
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<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">java/lang/Thread/virtual/PreviewFeaturesNotEnabled.java<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">java/lang/invoke/defineHiddenClass/PreviewHiddenClass.java<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">jdk/modules/etc/DefaultModules.java<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">tools/javac/launcher/GetResourceTest.java<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">tools/javac/launcher/SourceLauncherTest.java<o:p></o:p></span></li></ul>
</ul>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Analysis: The new test failures are not concerning for these reasons:
<o:p></o:p></span></li></ul>
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<ul type="circle">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo2;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">The failures are not due to any VirtualThreads related changes. All the tests failed because the test logic does not account for the possibility that the test JVM might run with the flag </span><code>--enable-preview</code><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">
. The tests can be split into two groups: <o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"-apple-system",serif">Tests that check the status of the flag </span><span style="font-family:"Segoe UI",sans-serif">--enable-preview</span><span style="font-size:10.5pt;font-family:"-apple-system",serif"> and always
assume that the test JVM does not use it.</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li></ol>
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<span style="font-size:10.5pt;font-family:"-apple-system",serif">java/lang/Thread/virtual/PreviewFeaturesNotEnabled.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l0 level4 lfo3;background:white;vertical-align:middle;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"-apple-system",serif">java/lang/invoke/defineHiddenClass/PreviewHiddenClass.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"-apple-system",serif">Tests that compile code but since they did not account for the case where the test JVM has preview features turned on, they run into this error: </span><span style="font-family:"Segoe UI",sans-serif">error:
--enable-preview must be used with --source</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li></ol>
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<span style="font-size:10.5pt;font-family:"-apple-system",serif">jdk/modules/etc/DefaultModules.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l0 level4 lfo3;background:white;vertical-align:middle;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"-apple-system",serif">tools/javac/launcher/GetResourceTest.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l0 level4 lfo3;background:white;vertical-align:middle;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"-apple-system",serif">tools/javac/launcher/SourceLauncherTest.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;background:white">All the failing tests pass when </span><code><span style="background:white">--enable-preview</span></code><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;background:white"> is
not used.</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">
<o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="text-align:justify;background:white"><u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">Comparison 2: JDK tip right before VirtualThreads (commit:
<a href="https://urldefense.com/v3/__https://github.com/openjdk/jdk/commit/5212535a276a92d96ca20bdcfccfbce956febdb1__;!!ACWV5N9M2RV99hQ!Om_5WP1WqudVvl8iV8DDs9YrDhbHLmbrCPBW_EI-oiS4DDIRfmEBpkqQtwES26qtikN5DFtyXWVQYc7zYy-t-r72jxU$">
521253</a>) vs right after (commit: <a href="https://urldefense.com/v3/__https://github.com/openjdk/jdk/commit/9583e3657e43cc1c6f2101a64534564db2a9bd84__;!!ACWV5N9M2RV99hQ!Om_5WP1WqudVvl8iV8DDs9YrDhbHLmbrCPBW_EI-oiS4DDIRfmEBpkqQtwES26qtikN5DFtyXWVQYc7zYy-t5L0uQlE$">
9583e36</a> + <a href="https://urldefense.com/v3/__https://github.com/openjdk/jdk/commit/ac274c4ca67555742065dc850823e924361f2ff7__;!!ACWV5N9M2RV99hQ!Om_5WP1WqudVvl8iV8DDs9YrDhbHLmbrCPBW_EI-oiS4DDIRfmEBpkqQtwES26qtikN5DFtyXWVQYc7zYy-tAMDGrd8$">
ac274c4</a>)</span></u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Results: There was only one new test failure that wasn't fixed in subsequent commits:
<o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">jdk/jshell/ToolBasicTest.java<o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Analysis: The new test failure pops up when VirtualThreads is both on and off.
<o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Test output: <a href="https://urldefense.com/v3/__https://pastebin.com/Zj7BYzSx__;!!ACWV5N9M2RV99hQ!Om_5WP1WqudVvl8iV8DDs9YrDhbHLmbrCPBW_EI-oiS4DDIRfmEBpkqQtwES26qtikN5DFtyXWVQYc7zYy-tQ3E2Z5Q$">
https://pastebin.com/Zj7BYzSx</a> <o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level2 lfo5;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">A similar failure was reported in the past (before VritualThreads was committed) on another platform:
<a href="https://bugs.openjdk.org/browse/JDK-8272744" target="_blank" title="https://bugs.openjdk.org/browse/jdk-8272744">
https://bugs.openjdk.org/browse/JDK-8272744</a><o:p></o:p></span></li></ul>
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<p class="MsoNormal" style="background:white"><u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">Conclusion</span></u><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">There is only 1 new test failure that can be attributed to the VirtualThreads commit that hasn't been already fixed is:
<o:p></o:p></span></li></ul>
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<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:black">jdk/jshell/ToolBasicTest.java</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p></o:p></span></li></ul>
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