Date: Tue, 13 Feb 2001 19:16:59 +0000 From: void <float@firedrake.org> To: Jordan Hubbard <jkh@winston.osd.bsdi.com> Cc: kstewart@urx.com, Danny Braniss <danny@cs.huji.ac.il>, freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance Message-ID: <20010213191659.A5429@firedrake.org> In-Reply-To: <81045.982046200@winston.osd.bsdi.com>; from jkh@winston.osd.bsdi.com on Mon, Feb 12, 2001 at 10:36:40PM -0800 References: <kstewart@urx.com> <81045.982046200@winston.osd.bsdi.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Feb 12, 2001 at 10:36:40PM -0800, Jordan Hubbard wrote:
>
> With how many running processors? If you're running -j4 on a
> uniprocessor system, you're only introducing competition for already
> scarce CPU resources, though -j2 can be a speedup since this allows
> one target build to run while another is in an I/O wait. I've only
> seen a speedup with -j4 when using at least 2 CPUs.
Interesting. When I asked about optimal values on this list maybe a
year ago, I was told that -j(4 * NCPU) was a good choice. I guess that
doesn't work for NCPU == 1.
--
Ben
"I told Paddy no, I told Steve no, I told Paul no, and Ben fell asleep."
--Kate C. (no, different Ben, I would have stayed up)
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010213191659.A5429>