Any benefit from compressed object pointers? (java6u14)

[Kevin Peterson <kp...@biz360.com>]

I noticed that Ubuntu pushed java 6 update 14 as an update to 9.04 today.
This update includes compressed object pointers which are designed to reduce
memory requirements with 64bit JVMs.

Has anyone experimented with this to see if it provides any benefit to Solr?

If not, can anyone comment on whether they would expect it provide a
significant benefit? I don't know enough about how the internal caches are
structured to say anything.

Our servers are running on 8.04 LTS, so upgrading would be a bit of a chore.
I'm hoping that someone can say "it's not worth it" before we try it
ourselves.

Re: Any benefit from compressed object pointers? (java6u14)

[Glen Newton <gl...@gmail.com>]

I am going to do some (large scale) indexing tests using Lucene & will
post to both this and the Lucene list.

More info on compressed pointers:
 http://wikis.sun.com/display/HotSpotInternals/CompressedOops

-Glen Newton
http://zzzoot.blogspot.com/search?q=lucene

2009/7/16 Kevin Peterson <kp...@biz360.com>:
> I noticed that Ubuntu pushed java 6 update 14 as an update to 9.04 today.
> This update includes compressed object pointers which are designed to reduce
> memory requirements with 64bit JVMs.
>
> Has anyone experimented with this to see if it provides any benefit to Solr?
>
> If not, can anyone comment on whether they would expect it provide a
> significant benefit? I don't know enough about how the internal caches are
> structured to say anything.
>
> Our servers are running on 8.04 LTS, so upgrading would be a bit of a chore.
> I'm hoping that someone can say "it's not worth it" before we try it
> ourselves.
>



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