Re: Process vs Thread: what are the consequences?

From:

"Kenneth P. Turvey" <kt-usenet@squeakydolphin.com>

Newsgroups:

comp.lang.java.programmer

Date:

13 Nov 2007 16:04:12 GMT

Message-ID:

<4739cafb$0$1751$ec3e2dad@news.usenetmonster.com>

On Tue, 13 Nov 2007 00:46:03 -0500, Lew wrote:

Java VMs from Sun since 1.4.2 have not used green threads, at least not on
Linux with the Native POSIX Thread Library (NPTL).

<http://java.sun.com/developer/technicalArticles/JavaTechandLinux/RedHat/index.html>

Just based on some experimentation I was doing, this doesn't seem to be
true. I'm running Linux with the Sun JVM, and it didn't map each Java
thread to a native thread until the Java thread was spending enough time
executing. I was actually trying to get this mapping (1 to 1) and found
it impossible to guarantee under Linux with the Sun JVM.

Under Solaris there is the -XX:UseBoundThreads (or something similar) to
get that behavior, but under Linux no such option exists.

I will freely admit that my experiment could have been flawed, but it
wasn't behaving as if it was using more than a single native thread. I
suspect that the article above is out of date.

--
Kenneth P. Turvey <kt-usenet@squeakydolphin.com>