# High CPU utilization tuning recommendations **URL:** \ **Category:** Elasticsearch\ **Created:** [February 21, 2013, 4:26pm UTC](https://discuss.elastic.co/t/high-cpu-utilization-tuning-recommendations/10844 "2013-02-21T16:26:21Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![vigeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vigeek/32/2477_2.png) [@vigeek](https://discuss.elastic.co/u/vigeek)\ **Post date:** [February 21, 2013, 4:26pm UTC](https://discuss.elastic.co/t/high-cpu-utilization-tuning-recommendations/10844/1 "2013-02-21T16:26:21Z")
Hey - Currently managing a two node ES cluster, that consists of two physical nodes with 32GB memory, SSDs and Intel E5 hexacore processors. Running ES (0.20.5) and the latest version of JAVA 1.7 JDK. Search performance is excellent, however, when pulling new documents from CouchDB using the couchdb\_river\_slurper it slows our cluster to a halt and generates massive amounts of load, in many cases this breaks cluster health as ping timeouts fail, etc. Polling hot threads show 'couchdb\_river\_slurper' consuming all resources during this period of load. We are using the following (default) properties in the river configuration. "bulk\_size" : "100", "bulk\_timeout" : "10ms" Would increasing say "bulk\_size" take processing load off the processor and place more load on disk? Both these bulk\_ values are default, so I suspect there is some tuning that can possibly be done. - Russ -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:50am UTC](https://discuss.elastic.co/t/high-cpu-utilization-tuning-recommendations/10844/2 "2017-07-06T02:50:16Z")
Closed on July 6, 2017, 2:50am UTC