# What Value of ParallelGCThreads should I set **URL:** \ **Category:** Elasticsearch\ **Created:** [July 20, 2020, 10:36pm UTC](https://discuss.elastic.co/t/what-value-of-parallelgcthreads-should-i-set/241940 "2020-07-20T22:36:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![khzied](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/khzied/32/68486_2.png) [@khzied](https://discuss.elastic.co/u/khzied)\ **Post date:** [July 20, 2020, 10:36pm UTC](https://discuss.elastic.co/t/what-value-of-parallelgcthreads-should-i-set/241940/1 "2020-07-20T22:36:03Z")
Hello, I have 9 servers Elasticsearch: 3 master and 6 datas. These 9 servers are identical:64 GB RAM, 8 CPU (each cpu has 4 cpu cores). Which correct value of ParallelGCThreads should I set in java.options. My Elasticsearch version is 5.6 Many thanks ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [July 20, 2020, 11:38pm UTC](https://discuss.elastic.co/t/what-value-of-parallelgcthreads-should-i-set/241940/2 "2020-07-20T23:38:37Z")
> [@khzied](#): > > My Elasticsearch version is 5.6 5.X has been EOL for quite some time now. You should upgrade as a matter of urgency. > [@khzied](#): > > Which correct value of ParallelGCThreads should I set in java.options. We don't recommend changing these. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 17, 2020, 11:53pm UTC](https://discuss.elastic.co/t/what-value-of-parallelgcthreads-should-i-set/241940/3 "2020-08-17T23:53:08Z")
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