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From kusuma chalasani <>
Subject Re: Tomcat Docker using AdoptOpenJDK-OpenJ9
Date Mon, 01 Jun 2020 06:52:01 GMT
Following on this, as I have raised a PR  to add the SCC options
into the OpenJ9 Docker file to avail this improvement, I got comments
saying that they would do only if upstream recommends.
As all individual users may not know that this option helps, we would like
to get this added into OpenJ9 Docker file itself.
I wanted to check with the community, if you are OK adding it ?  Or any
suggestions you would like to share on this ?

Thank You!

```If this is something upstream recommends, shouldn't it be noted in their
documentation? Maybe a configuration file/option which tells to
use their preferred options? It seems like even a dedicated subcommand (like
 run) to generate them would be useful, especially if the options during
generation need to be different than the options during runtime.

Given that I'm not aware of any documentation from upstream which
recommends this and that this is something users can accomplish in a
dependent Dockerfile that's FROM tomcat:...-openj9, I'm inclined to not do
this at this level for now.```

On Thu, May 21, 2020 at 2:02 PM Martin Grigorov <>

> On Mon, May 18, 2020 at 2:45 PM kusuma chalasani <>
> wrote:
>> Hi all,
>> I'm a Performance Analyst for JVM runtime. I recently tried out some
>> experiments to compare Tomcat startup performance in Docker using
>> AdoptOpenJDK-OpenJ9
>> I found I was able to get ~30% faster startup time with very minimal
>> change in footprint when I enable SharedClass Cache when I compared to the
>> default(which is No Shareclasses). I wrote a detailed blog post here
>>   where
>> I outlined what and how I measured.
>> I also did raise a PR for the same -
>> We figured we'd reach out to you guys so you can take a look, and maybe
>> try it out and let us know if you have any comments/questions.
> Thank you for sharing your findings with us, Kusuma!
>> Thanks,
>> Kusuma.


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