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From Stephen Powis <spo...@salesforce.com>
Subject Re: Usage of G1 Garbage collector
Date Fri, 03 Jun 2016 19:53:43 GMT
Here's the flags we're using:

-Xms3G -Xmx3G -XX:MaxPermSize=100M  -Xloggc:gc-%ID%.log
-XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintTenuringDistribution
-XX:+PrintGCApplicationStoppedTime -XX:+DisableExplicitGC
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=50M -XX:+UseCompressedOops
-XX:+AlwaysPreTouch -XX:+UseG1GC
-XX:MaxGCPauseMillis=20 -XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=OOMDump-%ID%.log

Here's a link to a GC log analysis (takes several minutes to load)
 http://gceasy.io/my-gc-report?p=L2hvbWUvcmFtL3VwbG9hZC9pbnN0YW5jZTEvc2hhcmVkLzIwMTYtNi0zL2djbG9nLnppcC0wLTU3LTE3

This is definitely outside the realm of my knowledge, so don't use
this as any kind of benchmark.
I'm curious if anyone can comment on any suggested adjustments?  I
feel like we have a ton of churn
in our young gen, but really don't have the experience tuning java's
GC or any examples to compare it with.

Thanks!


On Fri, Jun 3, 2016 at 3:41 PM, Otis Gospodnetić <otis.gospodnetic@gmail.com
> wrote:

> Hi,
>
> +1 for G1 for large heaps where you are seeing big GC pauses.  Works well
> for us.
> See:
> https://sematext.com/blog/2013/06/24/g1-cms-java-garbage-collector/
>
> Otis
> --
> Monitoring - Log Management - Alerting - Anomaly Detection
> Solr & Elasticsearch Consulting Support Training - http://sematext.com/
>
>
> On Tue, May 31, 2016 at 5:21 AM, Spico Florin <spicoflorin@gmail.com>
> wrote:
>
>> Hello!
>>  I would like the community  the following:
>> 1. Are you using the G1 garbage collector for your workers/supervisors
>>  in production?
>> 2. Have you observed any improvement added by adding this GC style?
>> 3. What are the JVM options that you are using and are a good fit for you?
>>
>> Thank you in advance.
>>  Regards,
>>  Florin
>>
>>
>

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