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Posted to dev@lucene.apache.org by LuXugang <xu...@icloud.com.INVALID> on 2021/04/02 06:04:41 UTC
[Lucene] BYTE_BLOCK_SIZE in class ByteBlockPool
Hi,
In class ByteBlockPool , per buffer's default maximum size was set 32KB（2 << 15）, is this such choice relevant with CPU L1 cache which cache size is 32KB？
If not so, could anyone give some tips？
Re: [Lucene] BYTE_BLOCK_SIZE in class ByteBlockPool
Posted by 陆徐刚 <xu...@eoitek.com>.
Thanks, Michael.
> 2021年4月2日 下午10:22，Michael McCandless <lucene@mikemccandless.com <ma...@mikemccandless.com>> 写道：
>
> Hmm I don't think the original selection of this size was due to CPU L1 cache limits. It was more a tradeoff of not wasting too much RAM for tiny indexing events (e.g. index one small document and then refresh) while still getting benefits of scale for the more common/important high indexing rate use-cases.
>
> Maybe try changing it and see if things get faster/slower for your usage?
>
> Mike McCandless
>
> http://blog.mikemccandless.com <http://blog.mikemccandless.com/>
>
> On Fri, Apr 2, 2021 at 2:05 AM LuXugang <xuganglu@icloud.com.invalid <ma...@icloud.com.invalid>> wrote:
> Hi,
>
> In class ByteBlockPool , per buffer's default maximum size was set 32KB（2 << 15）, is this such choice relevant with CPU L1 cache which cache size is 32KB？
>
> If not so, could anyone give some tips？
>
> <ByteBlockPool.png>
Re: [Lucene] BYTE_BLOCK_SIZE in class ByteBlockPool
Posted by Michael McCandless <lu...@mikemccandless.com>.
Hmm I don't think the original selection of this size was due to CPU L1
cache limits. It was more a tradeoff of not wasting too much RAM for tiny
indexing events (e.g. index one small document and then refresh) while
still getting benefits of scale for the more common/important high indexing
rate use-cases.
Maybe try changing it and see if things get faster/slower for your usage?
Mike McCandless
http://blog.mikemccandless.com
On Fri, Apr 2, 2021 at 2:05 AM LuXugang <xu...@icloud.com.invalid> wrote:
> Hi,
>
> In class ByteBlockPool , per buffer's default maximum size was set 32KB（2
> << 15）, is this such choice relevant with CPU L1 cache which cache size is
> 32KB？
>
> If not so, could anyone give some tips？
>
>