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Posted to dev@tomcat.apache.org by bu...@apache.org on 2022/08/15 10:10:30 UTC
[Bug 66209] CPU regression when classpath Bloom filters are active
https://bz.apache.org/bugzilla/show_bug.cgi?id=66209
--- Comment #1 from Mark Thomas <ma...@apache.org> ---
This patch essentially trades memory for performance. We have some users that
won't want to make that trade - even if the memory concerned is relatively
small.
Given the competing demands here, I think we need to find a way to make this
configurable. Whether that is by expanding useBloomFilterForArchives beyond a
simple boolean, by tweaking the background processing frequency or by a new
configuration option is TBD. I want to mull this over a little bit before
making any changes.
Thoughts?
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Re: [Bug 66209] CPU regression when classpath Bloom filters are active
Posted by Christopher Schultz <ch...@christopherschultz.net>.
Mark,
On 8/15/22 06:10, bugzilla@apache.org wrote:
> https://bz.apache.org/bugzilla/show_bug.cgi?id=66209
>
> --- Comment #1 from Mark Thomas <ma...@apache.org> ---
> This patch essentially trades memory for performance. We have some users that
> won't want to make that trade - even if the memory concerned is relatively
> small.
>
> Given the competing demands here, I think we need to find a way to make this
> configurable. Whether that is by expanding useBloomFilterForArchives beyond a
> simple boolean, by tweaking the background processing frequency or by a new
> configuration option is TBD. I want to mull this over a little bit before
> making any changes.
+1
true = use the bloom filter as exists today
false = do not use the bloom filter
wankel = use the bloom filter with cach-purges
-chris
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