Sep 6 2011

Java and 64-Bit Architecture - GC Pauses

Is 64-bit architecture a problem for Java and the current JVMs, this question has been in my mind for some time? In doing some deeper research for my upcoming presentations at NCDevCon, Adobe MAX Unconference and cf.Objective anz, I came across a really good blog piece addressing the possible issues basically posed by two things.

The dramatically increased size of the heap available to us and resulting garbage collection (GC) challenges.

The fact that 64-bit architecture, overall, is not always optimal for paradigms heavily using data structures. I touched on this a little in this earlier blog post

I am hoping in at least one if not all of my presentations to exercise BigMemory from the folks at Terracotta, which is attempting to help in reducing GC management and thereby increased pauses on 64-bit JVMs.

In the meantime, here is the great blog post and even more interesting comment thread, it is a little dense but well worth the read for those interested in all things performance related

Comments

David Ames wrote on 09/07/11 3:23 PM

Hey Mike,

We are currently working on integration Terracotta/BigMemory/EhCache into our application. The biggest problem so far is that objects that end up in BigMemory/Terracotta need to be serialized.

This means that it's impossible to put "transfer" in the cache and any other objects that contain references to singletons/factories/service layers.

Dave

Carl Meyer wrote on 09/07/11 9:35 PM

Hi Mike,

I sense there are some performance gains when it comes to big memory GC's on 64 bit to change to JDK 1.7 and G1 algorithm -XX:+UseG1GC, tho you could try that on 1.6 with experimental option.
Still early days I am yet to fully satisfy myself with CF metrics or JVM verbose logging comparisons with a similar load using JDK 1.6 versa 1.7.
Having said that - one would be moving away from Adobe CF official supported JDK version tho I guess most people alter the JVM some way with -Xms -Xmx etc so often is the case one would not be running on the installed -Xmx512m -XX:+UseParallelGC etc I guess officially supported setup configuration.

Cheers, Carl.

Mike Brunt wrote on 09/14/11 9:20 AM

Dave, thanks for this information. When you are saying "transfer" do you mean the ORM mechanism created by Mark Mandel; just wanting to clarify that. Obviously this is important information overall.

Mike Brunt wrote on 09/29/11 7:08 AM

Carl thanks, I meant to reply to your comment also. I have had a few clients who have tried to use JDK 1.7 but had problems getting CF to start. Like you, I would want to see that resolved and some good load-testing numbers with comparative data before vindicating 1.7 with ColdFusion. So far I have not read of any great benefits to "Garbage First" - -XX:+UseG1GC

Carl Meyer wrote on 09/29/11 6:01 PM

Hi Mike,

Oracle reference:

Garbage-First (G1) is a server-style GC, targeted for multi-processors with large memories, while achieving high throughput. Read on...

http://download.oracle.com/javase/7/docs/technotes/guides/vm/G1.html

http://www.oracle.com/technetwork/java/javase/tech/g1-intro-jsp-135488.html

Cheers, Carl.

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