David Deal wrote:
>
> Thanks for the info. It's still a bit strange as to why so _many_
> threads are started. I
> imaging a default thread poll is created to handle each task. Thanks
> also for the timely
> response.
Hard to say without knowing what you're doing. If you run with profiling
(simplest case: java -Xrunhprof ...) it'll record in the profile the
names of all threads that are started. The names are usually (although
not always) clues to what they're for.
Nathan
>
> Dave
>
> David Deal wrote:
> >
> > My apologies if this question has been raised in the past. I couldn't
>
> > locate any info on this topic at blackdown or on this mail list.
>
> Thanks for checking the list, even though you didn't manage to guess the
>
> lucky words to search :-).
>
> Those aren't separate processes, they're all threads of the same process
>
> - in Linux, lightweight threads take up process table entries, just like
>
> heavyweight processes. There's no hard-and-fast way to identify them as
> such, although running "top" and noticing that they all use exactly the
> same amount of memory is a strong hint. (Another, more precise, way is
> to compare /proc/<pid>/maps for multiple pids and notice that they're
> identical.)
>
> You don't see this weirdness when you run with green threads, because
> green threads are emulated in user space rather than provided by the
> kernel.
>
> Nathan
>
> > When I start java or rmregistry in native modeIget tons of child
> > processes (on the order of 25 - 60). Any idea why this is?
> > Is this normal behavior?
> >
> > example:
> > ddeal 31427 31403 0 Jul27 pts/7 00:00:02
> > /usr/local/java/bin/i386/native_threads/rmiregistry
> > ddeal 31428 31427 0 Jul27 pts/7 00:00:00
> > /usr/local/java/bin/i386/native_threads/rmiregistry
> > ddeal 31429 31427 0 Jul27 pts/7 00:00:00
> > /usr/local/java/bin/i386/native_threads/rmiregistry
> > ddeal 31430 31427 0 Jul27 pts/7 00:00:00
> > /usr/local/java/bin/i386/native_threads/rmiregistry
> > ...
> > and so on
> >
> > Running:
> > Redhat 6.0 i386
> > >uname -a
> > Linux mrstick 2.2.5-22 #1 Fri Jul 2 10:41:38 PDT 1999 i686 unknown
> > >java -version
> > java version "1.2"
> > Classic VM (build Linux_JDK_1.2_pre-release-v2, native threads,
> sunwjit)
> >
> > Thanks for any info or pointers.
> >
> > Dave
>
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