On Mon, 2007-12-03 at 11:05 +0100, Ingo Molnar wrote: > * Zhang, Yanmin <[EMAIL PROTECTED]> wrote: > > > Although no source codes of volanoMark, I suspect it calls > > Thread.sched. volanoMark is a kind of chatroom benchmark. When a > > client sends out a message, server will send the message to all > > clients. I suspect the client calls Thread.yield after sending out a > > couple of messages. > > yeah, so far only volanomark seems to be affected by this, and if it > indeed calls Thread.yield artificially it's a pretty stupid benchmark > and it's not the fault of the JDK. If we had the source to volanomark we > could fix this easily. > > > 2 JVM all have regression if sched_compat_yield=0. > > > > I ran some testing, such like iozone/specjbb/tbench/dbench/sysbench, > > and didn't see regression. > > which JVM was utilized by the specjbb (Java Business Benchmark) tests? BEA Jrockit. It supports huge pages which promote performance for about 8%~10%.
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