# High CPU Usage - Diagnosing **URL:** \ **Category:** Ignition\ **Created:** [May 8, 2018, 7:30am UTC](https://forum.inductiveautomation.com/t/high-cpu-usage-diagnosing/17954 "2018-05-08T07:30:58Z")\ **Posts on this page:** 1\ **Showing post:** 19
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [December 12, 2018, 2:29pm UTC](https://forum.inductiveautomation.com/t/high-cpu-usage-diagnosing/17954/19 "2018-12-12T14:29:12Z")
> [@oscar.salcedo](#): > > I have attached a copy of our ignition.conf file You have both CMS and G1GC set in your ignition.conf. G1GC is last, so that was chosen, but I recall reading that CMS settings can interfere with G1GC. Get rid of the wrapper.java.additional.1, .2, and .3. Add a target pause time. Consider logging garbage collector performance to determine if that is the cause of your clock drift warnings. See these topics: > [@Gateway / Java question 7.7.2](http://forum.inductiveautomation.com/t/gateway-java-question-7-7-2/10402): > > I have a general question about the performance of the gateway. As a background, we’ve had Ignition for a few years and have upgraded our server a couple of times as the number of clients we have has grown (using in-house MES application). We were on a 32 bit version with a couple of CPUs and 4gb of ram. As we continued expanding use of Ignition, the CPU usage gradually bumped up to where it was hovering in the 70% range with occasional spikes. We switched to a 64bit/Windows Server 2012 with… > [@Migrating to Java G1GC garbage collection](http://forum.inductiveautomation.com/t/migrating-to-java-g1gc-garbage-collection/18638): > > Reading up on [G1GC in forum posts](http://forum.inductiveautomation.com/search?q=G1GC), I’ve gathered: Clients Add jvm-args="-XX:+UseG1GC" to the end of the target string in the native client launcher shortcuts to use G1GC under Java 7 (from [this post](http://forum.inductiveautomation.com/t/openjdk-and-linux/18553/6) by @pturmel). On the other hand, I’m thinking this is not required as long as clients are running on Java 8+. See next point. Consider limiting Java versions to 8+ in gateway settings as G1GC is the default in Java 8 per [this post](http://forum.inductiveautomation.com/t/gateway-java-question-7-7-2/10402/6) by @pturmell. Also note [G1GC is not fully supported prior to JDK7 r…](http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/G1GettingStarted/index.html) --- _[View the full topic](https://forum.inductiveautomation.com/t/high-cpu-usage-diagnosing/17954)._