# What is a good method for testing out different elastic search jvm parameters

**URL:** <https://discuss.elastic.co/t/what-is-a-good-method-for-testing-out-different-elastic-search-jvm-parameters/153695>\
**Category:** Elasticsearch\
**Created:** [October 23, 2018, 11:50pm UTC](https://discuss.elastic.co/t/what-is-a-good-method-for-testing-out-different-elastic-search-jvm-parameters/153695 "2018-10-23T23:50:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![timliu9](https://avatars.discourse-cdn.com/v4/letter/t/87869e/32.png) [@timliu9](https://discuss.elastic.co/u/timliu9)\
**Post date:** [October 23, 2018, 11:50pm UTC](https://discuss.elastic.co/t/what-is-a-good-method-for-testing-out-different-elastic-search-jvm-parameters/153695/1 "2018-10-23T23:50:36Z")

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I have a large Elastic Search cluster that I want to tune better. I have a few different things I want to try, including some different jvm parameters. What might be a good way to test the parameters that provides a valid confirmation if the jvm parameters are better.

I was thinking of bring up a new node that has the new jvm parameters and benchmarking the cpu/gc/speed against the other nodes. Would that be a valid test? I read that for other types of tuning like the Java version, you shouldn't run different versions in the same cluster. Is that true for jvm parameters as well?

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**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\
**Post date:** [October 24, 2018, 12:06am UTC](https://discuss.elastic.co/t/what-is-a-good-method-for-testing-out-different-elastic-search-jvm-parameters/153695/2 "2018-10-24T00:06:57Z")

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We use rally to test these. I'm not really sure of the details beyond that though.

[https://github.com/elastic/rally](https://github.com/elastic/rally)

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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:** [November 21, 2018, 12:06am UTC](https://discuss.elastic.co/t/what-is-a-good-method-for-testing-out-different-elastic-search-jvm-parameters/153695/3 "2018-11-21T00:06:59Z")

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Closed on November 21, 2018, 12:06am UTC

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