<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Ioi Lam" <ioi.lam@oracle.com><br><b>To: </b>"leyden-dev" <leyden-dev@openjdk.org><br><b>Sent: </b>Monday, August 28, 2023 11:12:56 PM<br><b>Subject: </b>Re: I don't understand the wording here.<br></blockquote></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><font face="monospace">On 8/27/2023 1:24 PM, Remi Forax wrote:<br></font>
<blockquote cite="mid:412970896.19581004.1693167840174.JavaMail.zimbra@univ-eiffel.fr">
<div style="font-size: 12pt; color: rgb(0, 0, 0);"><font face="monospace"><br></font>
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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.</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></font></div>
<font face="monospace"><br></font>
<div><font face="monospace">[1] <a href="https://openjdk.org/projects/leyden/notes/03-toward-condensers" class="moz-txt-link-freetext" target="_blank">https://openjdk.org/projects/leyden/notes/03-toward-condensers</a><br></font></div>
<div><font face="monospace">[2] <a href="https://github.com/openjdk/leyden/tree/premain" class="moz-txt-link-freetext" target="_blank">https://github.com/openjdk/leyden/tree/premain</a><br></font></div>
<div><font face="monospace">[3] <a href="https://github.com/forax/computed-constant/blob/master/mvn-leyden.bash" class="moz-txt-link-freetext" target="_blank">https://github.com/forax/computed-constant/blob/master/mvn-leyden.bash</a><br></font></div>
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</blockquote>
<font face="monospace"><br>
Hi Remi,<br><br>
Thanks for trying the premain prototype. It's in very rough shape
so it will probably cause many surprises ...</font></blockquote><div><br></div><div>Not a lot, my main issue was having a training too short so a lot a compiled methods were not reaching the state 4.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><font face="monospace"><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.</font></blockquote><div><br></div><div>Ahh, thanks for the info,</div><div>My first version had the 3 passes, static CDS -> dynamic CDS -> replay, but I wrongly supposed that using 2 passes, dynamic CDS -> replay was possible and I did not checked if the Indy CP rentries were stored in the dynamic CDS.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><font face="monospace"><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" target="_blank">https://github.com/openjdk/leyden/blob/premain/test/hotspot/jtreg/premain/InvokeDynamic.md</a></font><br data-mce-bogus="1"></blockquote><div><br></div><div>Interresting,<br data-mce-bogus="1"></div><div>(BTW, The link to the prelinker is broken, it is in "src" not "test").</div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><font face="monospace"><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></font></blockquote><div><br></div><div>Regards,<br data-mce-bogus="1"></div><div>Rémi<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div></div></div></body></html>