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From Knut Anders Hatlen <Knut.Hat...@Sun.COM>
Subject Re: [jira] Updated: (DERBY-733) Starvation in RAFContainer.readPage()
Date Sat, 17 Dec 2005 00:42:07 GMT
Suresh Thalamati <suresh.thalamati@gmail.com> writes:

> Hi Knut,
> I am really puzzled with such a large differene in response
> times between the jdk142 and jdk15 jvms. Did u find out what has
> changed in jdk15 that is making the response time so bad ?

I was told that there wasn't any changes in thread scheduling between
1.4.2. and 1.5, so I guess it's just that monitors/synchronization
have been optimized with more focus on throughput than on fairness. I
think synchronization has become cheaper in 1.5, at least Derby runs a
lot faster on 1.5 than on 1.4.2 in a multi-client environment when it
is CPU bound. But there's always a trade-off...

Knut Anders

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