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From: Robert Watson <rwatson@FreeBSD.org>
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To: Peter Jeremy <peterjeremy@optushome.com.au>
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Cc: src-committers@freebsd.org, cvs-src@freebsd.org,
	Jeff Roberson <jeff@freebsd.org>, cvs-all@freebsd.org,
	David Xu <davidxu@freebsd.org>, Jeff Roberson <jroberson@chesapeake.net>
Subject: Re: cvs commit: src/sys/kern init_sysent.c
 syscalls.c	systrace_args.c
 src/sys/sys syscall.h syscall.mk sysproto.h
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On Tue, 4 Mar 2008, Peter Jeremy wrote:

> On Mon, Mar 03, 2008 at 02:24:54AM -1000, Jeff Roberson wrote:
>> it.  After all 1024 cpus should be enough forever.. ;)
>
> I notice the smiley but...  Based on Sun's claims, they should have 1024 
> thread boxes in 4-6 years.  They have 64-thread boxes now (8 core x 8 
> thread) [*] and have said they'll double threads/chip every 12-18 months.
>
> [*] I thought there was a dual-chip T5xxx which would have 128 threads)
>    but it doesn't show up.

It's also instructive to look at scalability issues in file descriptor related 
interfaces in userspace, which have a similar bitmask structure for things 
like select(), etc with fixed-size arrays.

Robert N M Watson
Computer Laboratory
University of Cambridge