On Tue, 2003-06-03 at 19:29, John Neffenger wrote:
Hi Bill,
Also, 2.5.x Linux has changes to their 1:1 model that greatly increases scalability for dealing with a large number of threads.
I was under the impression that Java application developers will have to wait for the Java virtual machines to take advantage of those threading changes before we see any benefits. I read that IBM needs to make changes in their Java VM on Linux to support it, for example. Is that correct?
That is my understanding right now. The latest JVM's from Sun and IBM apparently take steps to disable NPTL. I'm not if anyone working on the blackdown project is planning to get support for NPTL in ahead of Sun or IBM.
No, that's not true. Both JDK 1.4.1 and 1.4.2 from Sun support NPTL.
You can compare NPTL and LinuxThreads easily by running on RH-9 and setting LD_ASSUME_KERNEL to different values (see Redhat release notes). If you plan to run volano, don't forget to apply the latest glibc patch, it fixed a condvar bug that could hang volano. I've heard reports that 1.3.1 is OK too, but we didn't test it. Blackdown version works fine too.
regards, -hui
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