Hi Jonathan,
You mentioned 2.4 kernel. Do you know when it is going to
come out?
Jacob Nikom
Jonathan Doughty wrote:
>
> Daniel Stux wrote:
>
> > Here is what I see with Linux. I am running on a freshly installed
> > RedHat 6.1 machine. With either JDK, running in native threads is
> > absolutely crippling. There seems to be a serparate JDK process ID
> > for each running thread, or otherwise something is casuing it to
> > fork 15 times. Of these threads four or five of them just hammer the
> > CPU, leaving the whole machine at a crawl. Actual performance of our
> > Java GUI isn't too bad, but it's no where near where it should be.
>
> You are seeing an artifact of the Linux threading model: native Java
> threads are mapped onto kernel threads and kernel threads look a lot
> (to ps and friends) like separately forked processes. As for your
> four or five CPU hammers; that may be a Java problem, a Linux problem,
> or a Java/Linux problem but it is hard to say without more details
> from you.
>
> For a *really* good analysis (IMHO) of Java / Linux threading issues,
> kernel tweaks that can improve the situation, and what we might be
> seeing in the 2.4 kernels unless the Linux kernel powers that be
> address the situation, see the recently published paper:
> Java, threads, and scheduling in Linux
> Patching the kernel scheduler for better Java performance
> at http://www-4.ibm.com/software/developer/library/java2/index.html
> Recommended reading; the Java on Linux situation really needs this
> kind of work. (Speaking only for myself.)
>
> --
> Jonathan Doughty The MITRE Corporation [EMAIL PROTECTED]
>
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