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Date: Fri, 20 Sep 2002 16:45:09 -0700
To: Ingo Molnar <mingo@elte.hu>
Cc: Ulrich Drepper <drepper@redhat.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       "Bill Huey (Hui)" <billh@gnuppy.monkey.org>
Subject: Re: [ANNOUNCE] Native POSIX Thread Library 0.1
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From: Bill Huey (Hui) <billh@gnuppy.monkey.org>
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On Fri, Sep 20, 2002 at 02:50:29PM -0700, Bill Huey wrote:
> > how frequently does the GC thread run?
> 
> Don't remember off hand, but it's like to be several times a second which is
> often enough to be a problem especially on large systems with high load.
> 
> The JVM with incremental GC is being targetted for media oriented tasks
> using the new NIO, 3d library, etc... slowness in safepoints would cripple it
> for these tasks. It's a critical item and not easily address by the current
> 1:1 model.

Also throwing a signal to get the ucontext is pretty a expensive way of getting
it. But you folks know this already. Solaris threading has this via a some special
libraries. For large number of actively running threads, say, executing in a middle
of a method block it is potentially a huge problem for scalability.

Again, it's a critical issue from what I see of this.

bill

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