X-Authentication-Warning:	delorie.com: mail set sender to djgpp-bounces using -f
Date:	Sat, 01 Jan 2005 12:21:19 +0200
From:	"Eli Zaretskii" <eliz AT gnu DOT org>
Sender:	halo1 AT zahav DOT net DOT il
To:	djgpp AT delorie DOT com
Message-ID:	<01c4efeb$Blat.v2.2.2$c8277a80@zahav.net.il>
X-Mailer:	emacs 21.3.50 (via feedmail 8 I) and Blat ver 2.2.2
In-reply-to:	<g1bbt0990aj8g8eqdei7046v8fmpm4a0ts@4ax.com> (message from Brian
	Inglis on Fri, 31 Dec 2004 20:35:25 GMT)
Subject:	Re: DREADED fseek
References:	<8edus09uvkr9or13giuvdflk4ogin5q2l1 AT 4ax DOT com> <01c4ebed$Blat.v2.2.2$c5f598c0 AT zahav DOT net DOT il> <dl52t0tp5o1o6e5m6savh94u3vijmuq43r AT 4ax DOT com> <200412281245 DOT iBSCjQRj001350 AT envy DOT delorie DOT com> <72v3t01u5oeu89j63pfeece2ip780hsb45 AT 4ax DOT com> <01c4ed60$Blat.v2.2.2$fab621a0 AT zahav DOT net DOT il> <lhk4t0lng0g7ca3fc48qt6i7jbv1is4ksh AT 4ax DOT com> <01c4ee2a$Blat.v2.2.2$0f6c2800 AT zahav DOT net DOT il> <qip7t0pp2a6lbcndsjs9m1g4tv2ekfas5m AT 4ax DOT com> <01c4eea1$Blat.v2.2.2$74816940 AT zahav DOT net DOT il> <g1bbt0990aj8g8eqdei7046v8fmpm4a0ts AT 4ax DOT com>
Reply-To:	djgpp AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	djgpp AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

> From: Brian Inglis <Brian DOT Inglis AT SystematicSW DOT Invalid>
> Date: Fri, 31 Dec 2004 20:35:25 GMT
> 
> Typical results (including open and close) are:
> 
>                          __ default __  __ setvbuf __
> File   	Size Buffer Reads Time Transfer  Time Transfer Faster
>        	(MB)   (B)	 (s)	(MB/s)  (s)    (MB/s)
> PD2.DLL	 17  64K    278  1.813  9.574	1.762  9.853  setvbuf
> PD2.DLL	 17  32K    556  1.835  9.457	1.792  9.684  setvbuf
> PD2.DLL	 17  16K   1111  1.802  9.632	1.791  9.692  setvbuf
> PD2.DLL	 17   8K   2222  1.836  9.452	1.747  9.935  setvbuf
> PD2.DLL	 17   4K   4444  1.809  9.597	1.811  9.585  default
> PD2.DLL	 17   2K   8887  1.810  9.587	1.814  9.570  default
> PD2.DLL	 17   1K  17774  1.753  9.904	1.802  9.630  default
> PD2.DLL	 17  512  35548  1.782  9.740	1.788  9.705  default
> PD2.DLL	 17  256  71095  1.795  9.667	1.813  9.573  default

That fits my recollections: changing the buffer (any buffer) size
doesn't affect the I/O speed too much.

Thanks for digging into this.

- Raw text -