# ES\_DIRECT\_SIZE doesn't work **URL:** \ **Category:** Elasticsearch\ **Created:** [April 18, 2016, 7:50pm UTC](https://discuss.elastic.co/t/es-direct-size-doesnt-work/47705 "2016-04-18T19:50:09Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Arvind\_Kumar\_Chigura](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@Arvind\_Kumar\_Chigura](https://discuss.elastic.co/u/Arvind_Kumar_Chigura)\ **Post date:** [April 18, 2016, 7:50pm UTC](https://discuss.elastic.co/t/es-direct-size-doesnt-work/47705/1 "2016-04-18T19:50:09Z")
I am setting both ES\_DIRECT\_SIZE: 2048 and XX:MaxDirectMemorySize=2048m. But still ES working set in windows goes beyond 10G. I am doing simple searches against a 26GB index. ---
**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:** [April 18, 2016, 8:36pm UTC](https://discuss.elastic.co/t/es-direct-size-doesnt-work/47705/2 "2016-04-18T20:36:37Z")
Working set and heap size are different things. I don't believe you can control the former. ---
**Author:** ![Arvind\_Kumar\_Chigura](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@Arvind\_Kumar\_Chigura](https://discuss.elastic.co/u/Arvind_Kumar_Chigura)\ **Post date:** [April 18, 2016, 11:40pm UTC](https://discuss.elastic.co/t/es-direct-size-doesnt-work/47705/3 "2016-04-18T23:40:03Z")
Seems like using simplefs is the only way to go about it. How bad is the performance with simplefs compared to MMap on windows ? ---
**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, 10:58pm UTC](https://discuss.elastic.co/t/es-direct-size-doesnt-work/47705/4 "2017-07-05T22:58:20Z")
Closed on July 5, 2017, 10:58pm UTC