Statistics about CDS effectiveness

[Stephane Nicoll]

Hey,

I hope this mailing list is the right place for this. I am working with
Sébastien Deleuze on the Spring team and we've been focusing quite a bit on
CDS lately and how it can be easily leveraged by our user base.

One thing we quickly found out was that the cache can be more or less
effective depending on the way you start the app (classloaders, non
deterministic list of jar files, etc). Initially, we were testing the
startup time and comparing when CDS wasn't enabled.

I think there must be a better way and, for the lack of finding one, I've
developed a (very) pragmatic approach of parsing the JVM logs and producing
a report[1]. The tool has improved a bit for our own use case, creating the
cache and providing a report of the warnings that were issued (to spot
packages that couldn't be managed and why).

Parsing the logs is good enough for our little testing there but we were
wondering if there was an appetite (or need) to productize this. We were
thinking that JFR events could be an option.

Thanks,
S.


[1] https://github.com/snicoll/cds-log-parser

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