<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/13/25 4:14 PM, Charles Oliver
Nutter wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAE-f1xQ02fzuwSOCOgf3_3iu502H+MtUGFWcLj53WQhqMBnaZg@mail.gmail.com">
<div dir="ltr">
<div dir="ltr">On Thu, Feb 13, 2025 at 12:36 PM <<a href="mailto:ioi.lam@oracle.com" moz-do-not-send="true" class="moz-txt-link-freetext">ioi.lam@oracle.com</a>>
wrote:</div>
<div class="gmail_quote gmail_quote_container">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Which build of JDK 24 (or mainline) are you using?
There's a recent change that turns on
-XX:+AOTClassLinking automatically to take advantage of
all JEP 483 optimizations (including the AOT-linking of
lambdas)<br>
</p>
<p><a href="https://bugs.openjdk.org/browse/JDK-8348752" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://bugs.openjdk.org/browse/JDK-8348752</a><br>
</p>
<p>If you're using an older JDK 24 build (earlier than JDK
24-b35), you might need to add -XX:+AOTClassLinking
explicitly.</p>
<p>A good way for checking is with -Xlog:cds,class+load
and see how many classes you are loading from CDS vs
dynamically parsed.<br>
</p>
</div>
</blockquote>
<div class="gmail_quote gmail_quote_container">I'm running the
RC from last week:</div>
<div class="gmail_quote gmail_quote_container"><br>
</div>
$ java -version<br>
openjdk version "24" 2025-03-18<br>
OpenJDK Runtime Environment (build 24+36-3646)<br>
OpenJDK 64-Bit Server VM (build 24+36-3646, mixed mode,
sharing)<br>
<div><br>
</div>
<div>But perhaps the fix I need is not in this build? I ran
the record and create steps again with -XX:+AOTClassLinking
and performance wasn't substantially changed.</div>
<div><br>
</div>
<div>I do see lines like this, though, when I enable logging:</div>
<div><br>
</div>
<div>[0.895s][info][class,load]
org.jruby.util.io.FilenoUtil$ReflectiveAccess$$Lambda/0x8000004ea
source: shared objects file<br>
[0.895s][info][class,load]
org.jruby.util.io.FilenoUtil$ReflectiveAccess$$Lambda/0x8000004eb
source: shared objects file</div>
<div><br>
</div>
</div>
</div>
</blockquote>
<p>24+36 should have the fix, so -XX:+AOTClassLinking should be
enabled for you. You can check for this log to confirm:</p>
<p>[0.022s][info][cds] Using AOT-linked classes: true (static
archive: has aot-linked classes)<br>
</p>
<p>Thanks</p>
<p>- Ioi<br>
</p>
<p><br>
</p>
<blockquote type="cite" cite="mid:CAE-f1xQ02fzuwSOCOgf3_3iu502H+MtUGFWcLj53WQhqMBnaZg@mail.gmail.com">
<div dir="ltr">
<div class="gmail_quote gmail_quote_container">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p> </p>
<p>Thanks</p>
<p>- Ioi<br>
</p>
<div>On 2/13/25 7:12 AM, Charles Oliver Nutter wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>I figured folks here would be interested to see
this experiment using AOTCache with JRuby.</div>
<div><br>
</div>
<div><a href="https://urldefense.com/v3/__https://gist.github.com/headius/1a5cfbc91ed8bacd194f1c592a90c275__;!!ACWV5N9M2RV99hQ!KZcAz5KTpP2IgI_aftEtgit5ChKERmROAdOTz_Zf0sAGvS4HmvkWVd1FIWtD0H5ntnmOd-VFmRwpRuw$" target="_blank" moz-do-not-send="true">https://gist.github.com/headius/1a5cfbc91ed8bacd194f1c592a90c275</a></div>
<div><br>
</div>
<div>I just test the 'hello world' scenario that
represents our baseline startup, but AOT caching
manages to beat the automatic AppCDS startup by a
bit. More/better training might help here I'm
guessing?</div>
<div><br>
</div>
<div>This is from the JRuby 10 branch (10-dev) on <a href="https://urldefense.com/v3/__https://github.com/jruby/jruby.git__;!!ACWV5N9M2RV99hQ!KZcAz5KTpP2IgI_aftEtgit5ChKERmROAdOTz_Zf0sAGvS4HmvkWVd1FIWtD0H5ntnmOd-VFSatN9Qg$" target="_blank" moz-do-not-send="true">https://github.com/jruby/jruby.git</a>
if anyone wants to play with it. Just run `./mvnw`
and then `bin/ruby` will work. We recently added
support for AutoCreateSharedArchive so it will use
CDS by default. Pass --nocache to disable that
behavior.</div>
<div><br>
</div>
<div>
<div dir="ltr" class="gmail_signature">
<div dir="ltr"><b>Charles Oliver Nutter</b>
<div><i>Architect and Technologist</i></div>
<div>Headius Enterprises</div>
<a href="https://urldefense.com/v3/__https://www.headius.com__;!!ACWV5N9M2RV99hQ!KZcAz5KTpP2IgI_aftEtgit5ChKERmROAdOTz_Zf0sAGvS4HmvkWVd1FIWtD0H5ntnmOd-VFRgsB7Uw$" target="_blank" moz-do-not-send="true">https://www.headius.com</a>
<div>
<div><a href="mailto:headius@headius.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">headius@headius.com</a></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
</div>
</blockquote>
</body>
</html>