I don't understand the wording here.

[Ioi Lam]

On 8/27/2023 1:24 PM, Remi Forax wrote:
>
> 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.
> 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.
>
> [1] https://openjdk.org/projects/leyden/notes/03-toward-condensers
> [2] https://github.com/openjdk/leyden/tree/premain
> [3] https://github.com/forax/computed-constant/blob/master/mvn-leyden.bash

Hi Remi,

Thanks for trying the premain prototype. It's in very rough shape so it 
will probably cause many surprises ...

One thing I want to point out is that the -XX:+ArchiveInvokeDynamic 
option works only with "static CDS dump", e.g., -Xshare:dump.

It has no effect with "dynamic CDS dump", e.g., the 
-XX:ArchiveClassesAtExit option used by your script in [3] above.

I have some docs about using the -XX:+ArchiveInvokeDynamic flag and 
checking its effects:

https://github.com/openjdk/leyden/blob/premain/test/hotspot/jtreg/premain/InvokeDynamic.md

You can also see some stats like:

$ java -Xshare:dump -Xlog:cds -XX:+ArchiveInvokeDynamic
[...]
[4.209s][info   ][cds     ] Class  CP entries =  19623, archived =   
6600 ( 33.6%)
[4.209s][info   ][cds     ] Field  CP entries =   7867, archived =   
2481 ( 31.5%)
[4.209s][info   ][cds     ] Method CP entries =  32366, archived =   
3354 ( 10.4%)
[4.209s][info   ][cds     ] Indy   CP entries =    729, archived =     
56 (  7.7%)

Thanks
- Ioi
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mail.openjdk.org/pipermail/leyden-dev/attachments/20230828/24f70a18/attachment.htm>