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From "Tony Wu" <wuyue...@gmail.com>
Subject Re: [general][performance] Serialization patches need committer attention
Date Tue, 15 Apr 2008 03:08:42 GMT
Hi, Aleksey
I'm looking at 5722. I agree with you on leveraging the Accessor but I
think it would be good if you can post some micro-benchmark on this
JIRA so that we can utilize it as regression test in future.

On 4/15/08, Aleksey Shipilev <aleksey.shipilev@gmail.com> wrote:
> Hi all,
> As you might noticed, there is active work on serialization
> performance improvements [1]. So far we had committed 4 patches
> concerning scalability and boosted the performance on multi-threaded
> serialization benchmarks more than 2x times. And this is not the end
> of the journey: more issues coming.
> Dear committers, can you please review and commit the patches in ready JIRAs?
> I will be happy if these two committed:
>  a. [classlib][luni][performance] ObjectInputStream/ObjectOutputStream
> can use optimized API for accessing fields - available at [2]
> This issue moves the setField/getField functionality to ObjectAccessor
> utility class. This eliminates one serious problem: creation of string
> during field name lookup on native side. The second advantage is that
> this solution checks security on accessor creation rather than on
> every call (like Reflection API does). This improvement gives another
> 30-120% boost for serialization workload.
> I expect more with rewriting these accessors on magics, thus
> eliminating JNI overhead and native-side work. Those who interested in
> this topic, feel free to join in corresponding JIRA [3].
>  b. [classlib][luni][performance] j.u.IdentityHashMap ariphmetic
> improvements - available at [4]
> After the moving of ObjectStreamClass cache to ThreadLocalCache [5],
> performance of serialization depends on ThreadLocal performance and
> then on IdentityHashMap performance. Simple benchmark shows that
> ThreadLocal performance is devastating: 50x slower than Sun 1.6.0_05
> [6]. This is very first ready patch from that chain of issues. It
> brings up +300% boost on ThreadLocal benchmark and +10% boost to
> serialization benchmark.
> Thanks,
> Aleksey.
> [1] https://issues.apache.org/jira/browse/HARMONY-5632
> [2] https://issues.apache.org/jira/browse/HARMONY-5722 (ready)
> [3] https://issues.apache.org/jira/browse/HARMONY-5725
> [4] https://issues.apache.org/jira/browse/HARMONY-5718 (ready)
> [5] https://issues.apache.org/jira/browse/HARMONY-5633
> [6] https://issues.apache.org/jira/browse/HARMONY-5703

Tony Wu
China Software Development Lab, IBM

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