# Why the size of search thread pool in ES2.3.3 is smaller than before(f.e es version 1.3.0 )

**URL:** <https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638>\
**Category:** Elasticsearch\
**Created:** [July 4, 2016, 11:09am UTC](https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638 "2016-07-04T11:09:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kankedong](https://avatars.discourse-cdn.com/v4/letter/k/e9a140/32.png) [@kankedong](https://discuss.elastic.co/u/kankedong)\
**Post date:** [July 4, 2016, 11:09am UTC](https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638/1 "2016-07-04T11:09:08Z")

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My server cpu cores are 24,today,i find the number of the search thread pool is 37 in my es version2.3.3;i want to know why this number is smaller than old version. what is the new default setting perpous?  
thx for any answers~

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**Author:** ![rusty](https://avatars.discourse-cdn.com/v4/letter/r/f17d59/32.png) [@rusty](https://discuss.elastic.co/u/rusty)\
**Post date:** [July 4, 2016, 11:32am UTC](https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638/2 "2016-07-04T11:32:06Z")

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Hi! Take a look into this:

> [@Elasticsearch num processors/bulk threads detection](https://discuss.elastic.co/t/elasticsearch-num-processors-bulk-threads-detection/54584/4):
>
> I looked into the code, Elasticsearch has a maximum limit of 32 for processor-based thread pools. See org.elasticsearch.common.util.concurrent.EsExecutors /\*\* \* Returns the number of processors available but at most \<tt\>32\</tt\>. \*/ public static int boundedNumberOfProcessors(Settings settings) { /\* This relates to issues where machines with large number of cores \* ie. \>= 48 create too many threads and run into OOM see #3478 \* We just use an 32 core u…

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**Author:** ![kankedong](https://avatars.discourse-cdn.com/v4/letter/k/e9a140/32.png) [@kankedong](https://discuss.elastic.co/u/kankedong)\
**Post date:** [July 4, 2016, 11:50am UTC](https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638/3 "2016-07-04T11:50:25Z")

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thx~

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:38pm UTC](https://discuss.elastic.co/t/why-the-size-of-search-thread-pool-in-es2-3-3-is-smaller-than-before-f-e-es-version-1-3-0/54638/4 "2017-07-05T22:38:31Z")

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