Re: ConcurrentLinkedQueue question
On 07.01.2007 15:07, Joe Seigh wrote:
Robert Klemme wrote:
On 06.01.2007 18:33, Joe Seigh wrote:
The background on this was a question on c.p.t on whether implementing
the Michael and Scott algorithm in C# using GC to avoid the ABA
problem was as efficient as Java's. Apparently it is. Which
kind of obviates the 2 different ways I figured out how to avoid
using GC for node recycling when you don't have AtomicStampedReference.
The is for unbounded queues. The original Michael and Scott algorithm
is either bounded or expandable only (you can't shrink the node pool).
If you are looking for how GC works in current JVM's and why it is so
fast you can have a look here:
http://www-128.ibm.com/developerworks/library/j-jtp01274.html
I knew some of that already. I agree that the Java GC sucks much
less than it used to. :) I suspect that I'm going to have to code
up alternate implementations implementations and run performance
tests myself. There are some other issues raised as well. I'm
going to take this offline. c.l.j.p probably isn't the appropiate
place to raise java design and rationale issues.
My 0.02 EUR, since this all seems pretty theoretical at the moment,
create your application using library classes, profile and optimize then
if and only *if* there is an issue. Creating your own test cases is not
the same as profiling the application exactly because the JVM is a
highly complex beast nowadays and it likely behaves different with
artificial test cases than with the real thing.
Regards
robert
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