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<font face="monospace">On 8/27/2023 1:24 PM, Remi Forax wrote:<br>
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<blockquote type="cite" cite="mid:412970896.19581004.1693167840174.JavaMail.zimbra@univ-eiffel.fr">
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<div><font face="monospace">If you play with the premain
prototype of Leyden [2], there is a global option
-XX:+ArchiveInvokeDynamic that stores all the callsite
targets of the first run (training run) inside the CDS
archive.<span style="color: #067d17;" data-mce-style="color: #067d17;"></span></font></div>
<div><font face="monospace">Here is an example of how to use
the prototype to run maven [3], the first run of maven
keep the dynamic information into a CDS archive and a code
archive so the next runs re-use those informations to get
a faster warmup time.<br data-mce-bogus="1">
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<div><font face="monospace">[1] <a href="https://openjdk.org/projects/leyden/notes/03-toward-condensers" data-mce-href="https://openjdk.org/projects/leyden/notes/03-toward-condensers" moz-do-not-send="true" class="moz-txt-link-freetext">https://openjdk.org/projects/leyden/notes/03-toward-condensers</a><br data-mce-bogus="1">
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<div><font face="monospace">[2] <a href="https://github.com/openjdk/leyden/tree/premain" data-mce-href="https://github.com/openjdk/leyden/tree/premain" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/openjdk/leyden/tree/premain</a><br data-mce-bogus="1">
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<div><font face="monospace">[3] <a href="https://github.com/forax/computed-constant/blob/master/mvn-leyden.bash" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/forax/computed-constant/blob/master/mvn-leyden.bash</a><br>
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Hi Remi,<br>
<br>
Thanks for trying the premain prototype. It's in very rough shape
so it will probably cause many surprises ...<br>
<br>
One thing I want to point out is that the
-XX:+ArchiveInvokeDynamic option works only with "static CDS
dump", e.g., -Xshare:dump.<br>
<br>
It has no effect with "dynamic CDS dump", e.g., the
-XX:ArchiveClassesAtExit option used by your script in [3] above.<br>
<br>
I have some docs about using the -XX:+ArchiveInvokeDynamic flag
and checking its effects:<br>
<br>
<a class="moz-txt-link-freetext" href="https://github.com/openjdk/leyden/blob/premain/test/hotspot/jtreg/premain/InvokeDynamic.md">https://github.com/openjdk/leyden/blob/premain/test/hotspot/jtreg/premain/InvokeDynamic.md</a><br>
<br>
You can also see some stats like:<br>
<br>
$ java -Xshare:dump -Xlog:cds -XX:+ArchiveInvokeDynamic<br>
[...]<br>
[4.209s][info ][cds ] Class CP entries = 19623, archived
= 6600 ( 33.6%)<br>
[4.209s][info ][cds ] Field CP entries = 7867, archived
= 2481 ( 31.5%)<br>
[4.209s][info ][cds ] Method CP entries = 32366, archived
= 3354 ( 10.4%)<br>
[4.209s][info ][cds ] Indy CP entries = 729, archived
= 56 ( 7.7%)<br>
<br>
Thanks<br>
- Ioi<br>
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