# High CPU on bulk update/insert
**URL:** https://discuss.elastic.co/t/high-cpu-on-bulk-update-insert/112326
**Category:** Elasticsearch
**Created:** [December 19, 2017, 1:25am UTC](https://discuss.elastic.co/t/high-cpu-on-bulk-update-insert/112326 "2017-12-19T01:25:26Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Zuhaib\_Siddique](https://discuss.elastic.co/u/Zuhaib_Siddique)
#### Post date: [December 19, 2017, 1:25am UTC](https://discuss.elastic.co/t/high-cpu-on-bulk-update-insert/112326/1 "2017-12-19T01:25:26Z")
So I have attached our Hot Thread, [https://gist.github.com/zsiddique/5cf5212582f87dd1cf8c9332c553d8c9](https://gist.github.com/zsiddique/5cf5212582f87dd1cf8c9332c553d8c9), we are using an update script (Groovy right now) to handle updates. We need a script to update because we use nested data type and want to handle updates in that nested field.
We are seeing a handful of nodes have high CPU (mostly those with more primary shards) but other nodes are pretty ok (around 50%). We are indexing peak around 10k/s, around 8-9k/s normally.
We are running 12 data nodes, i3.2xl on AWS. I would expect we could push more documents per seconds.
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### Author:  [@zqc0512](https://discuss.elastic.co/u/zqc0512)
#### Post date: [December 19, 2017, 3:12am UTC](https://discuss.elastic.co/t/high-cpu-on-bulk-update-insert/112326/2 "2017-12-19T03:12:14Z")
see the configure about elasticsearch.yml file update theapool setting
see the io about system. good idea use SSD..
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 16, 2018, 3:12am UTC](https://discuss.elastic.co/t/high-cpu-on-bulk-update-insert/112326/3 "2018-01-16T03:12:33Z")
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