RFR  optimization of CopyOnWriteArrayList.addIfAbsent()
lowasser at google.com
Tue Apr 2 22:36:33 UTC 2013
I would be deeply suspicious of benchmarks that naive, especially for
benchmarks like this that involve lots of allocation -- you're most likely
benchmarking the GC, not the actual operation.
On Tue, Apr 2, 2013 at 3:33 PM, Ivan Gerasimov <ivan.gerasimov at oracle.com>wrote:
> On 03.04.2013 1:17, Martin Buchholz wrote:
>> Have you benchmarked the case where the element is never present?
> That's the only case I've tested.
> If the element were in the array, my code would obviously win.
> (with the usual caveats about micro-benchmarking - perhaps use google
> The tests I wrote are quite simple - they just run a code snippet for
> several hundreds of times.
> I've just sent and archive with the tests in reply to the other message in
> the thread.
>> On Tue, Apr 2, 2013 at 2:11 PM, Ivan Gerasimov <ivan.gerasimov at oracle.com<mailto:
>> ivan.gerasimov at oracle.**com <ivan.gerasimov at oracle.com>>> wrote:
>> I've done a little testing on my side.
>> I used Integer as an underlying type and set length of the array
>> to the values from 1 to 100.
>> My code shows a little performance gain - approximately 9%.
>> I understand it may not be there for all cases, but at least for
>> some cases it is there.
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