<div dir="ltr"><div>Just tried Alexey's build and everything works like a charm!</div><div><br></div><div>Thanks for the help folks!<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Nov 25, 2024 at 6:26 PM Georgios Andrianakis <<a href="mailto:gandrian@redhat.com">gandrian@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Thanks a lot for the information Roman!</div><div><br></div><div>I will try Alexey's builds and report back if there are any issues.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Nov 25, 2024 at 6:16 PM Kennke, Roman <<a href="mailto:rkennke@amazon.de" target="_blank">rkennke@amazon.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Georgios,<br>
<br>
This is a peculiarity with the Oracle builds. Oracle has decided to not generate CDS archives with compact headers in their builds:<br>
<a href="https://bugs.openjdk.org/browse/JDK-8341553" rel="noreferrer" target="_blank">https://bugs.openjdk.org/browse/JDK-8341553</a><br>
<br>
Other vendors are free to generate compact-headers-CDS-archives, and, afaik, it is on-by-default in OpenJDK sources.<br>
<br>
FWIW, the COH-CDS archives are generated in Aleksey’s build, you may want to give them a try:<br>
<a href="https://builds.shipilev.net/openjdk-jdk/" rel="noreferrer" target="_blank">https://builds.shipilev.net/openjdk-jdk/</a><br>
<br>
Roman<br>
<br>
<br>
> Thanks a lot for the tip! <br>
> Indeed, forcing the creation of the archive eliminates the regression in startup time.<br>
> <br>
> So now my question becomes, will this process be necessary even when JDK 24 ships, or will the archive be part of the release so users don't have to create it manually?<br>
> <br>
> On Mon, Nov 25, 2024 at 4:44 PM Stefan Karlsson <<a href="mailto:stefan.karlsson@oracle.com" target="_blank">stefan.karlsson@oracle.com</a>> wrote:<br>
> Hi Georgios,<br>
> <br>
> The regression seems to come from the lack of CDS. I see similar regressions when I run with -Xshare:off.<br>
> <br>
> I guess that these EA builds don't include the CDS archive for compact object headers:<br>
> $ time jdk-24-ea-b25/bin/java -XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders -Xlog:cds*=trace -version<br>
> [0.012s][info][cds] trying to map /home/stefank/java/jdk-24-ea-b25/lib/server/classes_coh.jsa<br>
> [0.012s][info][cds] Specified shared archive not found (/home/stefank/java/jdk-24-ea-b25/lib/server/classes_coh.jsa)<br>
> [0.012s][info][cds] Initialize static archive failed.<br>
> [0.012s][info][cds] Unable to map shared spaces<br>
> <br>
> Try to first dump the CDS archive with:<br>
> $ jdk-24-ea-b25/bin/java -XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders -Xshare:dump -version<br>
> <br>
> After I have run that I get the CDS archive:<br>
> $ time jdk-24-ea-b25/bin/java -XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders -Xlog:cds*=trace -version<br>
> [0.011s][info][cds] trying to map /home/stefank/java/jdk-24-ea-b25/lib/server/classes_coh.jsa<br>
> [0.011s][info][cds] Opened archive /home/stefank/java/jdk-24-ea-b25/lib/server/classes_coh.jsa.<br>
> [0.011s][info][cds] Archive was created with UseCompressedOops = 1, UseCompressedClassPointers = 1, UseCompactObjectHeaders = 1<br>
> ...<br>
> <br>
> Could you try and see if that helps the startup times for you?<br>
> <br>
> Cheers,<br>
> StefanK<br>
> <br>
> On 2024-11-25 15:22, Georgios Andrianakis wrote:<br>
>> Hi folks,<br>
>> <br>
>> I just tried the Lilliput (JEP 450) using the latest OpenJDK 24 EA build on a sample Quarkus application to see how beneficial Lilliput can be for us.<br>
>> <br>
>> On my machine (a Ryzen 5950X running Linux) with Lilliput disabled, the application starts up in around 600ms and consumes around 140MB of RSS memory (before the application handles any traffic).<br>
>> With Lilliput enabled (via -XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders) I see RSS falling to around 130MB which is really nice!<br>
>> However I also see a startup regression of around 30ms (approximately 5%). Is this something that is expected?<br>
>> <br>
>> Thanks!<br>
>> <br>
>> P.S. Apologies if this is not the correct mailing list for Lilliput related topics<br>
>> <br>
>> -- <br>
>> Georgios Andrianakis<br>
>> Independent Contractor<br>
>> <br>
> <br>
> <br>
> <br>
> -- <br>
> Georgios Andrianakis<br>
> Independent Contractor<br>
<br>
<br>
<br>
<br>
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</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>
<p style="font-weight:bold;margin:0px;padding:0px;font-size:14px;font-family:"RedHatText",sans-serif">
<span>Georgios</span>
<span>Andrianakis</span>
<span style="color:rgb(170,170,170);margin:0px"></span>
</p>
<p style="font-weight:normal;font-size:12px;margin:0px;font-family:"RedHatText",sans-serif">
<span>Independent Contractor</span></p><p style="font-weight:normal;font-size:12px;margin:0px;font-family:"RedHatText",sans-serif"><span><br></span>
</p>
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</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>
<p style="font-weight:bold;margin:0px;padding:0px;font-size:14px;font-family:"RedHatText",sans-serif">
<span>Georgios</span>
<span>Andrianakis</span>
<span style="color:rgb(170,170,170);margin:0px"></span>
</p>
<p style="font-weight:normal;font-size:12px;margin:0px;font-family:"RedHatText",sans-serif">
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