If you’re equating the performance test blog I linked to as my assumptions
about GC, you would be incorrect. I was simply linking to some performance
testing done by someone who posted actual results. I’ve read the documentation
and understand G1 is meant to do the sizing for newgen without explicit
configuration.
What I haven’t found is any hard evidence from performance tests showing that
G1 beats out a properly tuned CMS config. I am not basing my statements on the
sole findings of the test results I linked to. I’ve found multiple sources
which all state the same thing, specifically some tests done against JIRA with
default configurations of the various jvm collectors showing CMS still on top.
The performance on G1 just isn’t there yet.
What I’m looking for is information as to why artifactory decided to default to
G1GC when they were previously using CMS, or some hard evidence showing G1GC
out performing CMS.
From: "ryangardner [via Artifactory]"
<[email protected]<mailto:[email protected]>>
Date: Monday, June 2, 2014 at 3:43 PM
To: Ryan Goodwin <[email protected]<mailto:[email protected]>>
Subject: Re: Artifactory 3.0.4 performance tuning and G1GC vs CMS
For long running services, CMS will also be far more likely to have
unacceptable pauses because it does not compact its old gen heap. It's not a
matter of "if" you see a "ConcurrentModeFailure" but "when" - with tuning you
can make them less frequent, but all it takes is a period of unusually high
object allocations and your application will suddenly be paused for 1-2 seconds.
--
View this message in context:
http://forums.jfrog.org/Artifactory-3-0-4-performance-tuning-and-G1GC-vs-CMS-tp7579846p7579878.html
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