Date: Thu, 11 May 2000 22:21:42 -0700 (PDT) From: Kris Kennaway <kris@FreeBSD.org> To: Kent Stewart <kstewart@3-cities.com> Cc: George Cox <gjvc@sophos.com>, freebsd-hackers@freebsd.org Subject: Re: Double buffered cp(1) Message-ID: <Pine.BSF.4.21.0005112219060.49885-100000@freefall.freebsd.org> In-Reply-To: <3904B391.D72E8D0E@3-cities.com>
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On Mon, 24 Apr 2000, Kent Stewart wrote:
> This is what I see on a buildworld with 4.0-Stable
>
> Modified /etc/make.conf and commented out CFLAGS= -Os -pipe
> 3707.4u 799.6s 1:35:52.46 78.3% 1374+1477k 56974+173232io 2337pf+0w
> 3693.9u 800.5s 1:29:45.73 83.4% 1375+1477k 55201+173224io 2160pf+0w
> Modified /etc/make.conf and added CFLAGS= -pipe
> 3559.2u 807.2s 1:28:00.05 82.6% 1608+1286k 56499+174033io 2516pf+0w
This is an old message, but what you're seeing here is that if CFLAGS is
not overridden, it is set by sys.mk to "-O -pipe"
Setting CFLAGS explicitly to "-pipe" is faster because it does no
optimization, "-Os -pipe" would be slower because it does more. Leaving
out -pipe would be slower still, because the compiler does data passing
using temporary files in /tmp instead of via a pipe.
Kris
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