Date: Sun, 14 Apr 1996 18:48:36 -0400 (EDT) From: "Marc G. Fournier" <scrappy@ki.net> To: Gary Palmer <gpalmer@FreeBSD.ORG> Cc: nash@mcs.com, hackers@FreeBSD.ORG Subject: Re: Unices are created equal, but... Message-ID: <Pine.BSI.3.92.960414184638.22378G-100000@ki.net> In-Reply-To: <852.829520523@palmer.demon.co.uk>
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On Sun, 14 Apr 1996, Gary Palmer wrote:
> Alex Nash wrote in message ID
> <199604142039.PAA04761@zen.nash.org>:
> > FreeBSD on UFS:
> > 2770803 bytes/second for writing the file
> > 3908495 bytes/second for reading the file
> >
> > Linux on ext2fs:
> > 3220442 bytes/second for writing the file
> > 1950476 bytes/second for reading the file
>
> ^^^^^^^
>
> Is that 2nd figure for reading the file right? Seems a bit dubious
> ... unless they're really doing something screwey, you should get
> higher speeds READING than writing ...
>
> Gary
>
You might think so, but:
> iozone 22
IOZONE: Performance Test of Sequential File I/O -- V1.16 (10/28/92)
By Bill Norcott
Operating System: POSIX 1003.1-1988 -- using fsync()
Send comments to: norcott_bill@tandem.com
IOZONE writes a 22 Megabyte sequential file consisting of
45056 records which are each 512 bytes in length.
It then reads the file. It prints the bytes-per-second
rate at which the computer can read and write files.
Writing the 22 Megabyte file, 'iozone.tmp'...10.703125 seconds
Reading the file...11.023438 seconds
IOZONE performance measurements:
2155321 bytes/second for writing the file
2092693 bytes/second for reading the file
> df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/sd0s1d 224174 108770 97470 53% /home
(ncr0:0:0): "QUANTUM FIREBALL1280S 630C" type 0 fixed SCSI 2
sd0(ncr0:0:0): Direct-Access
sd0(ncr0:0:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Not much of a difference, but still slower to read then to
write. (-stable kernel as of March 26th)
Marc G. Fournier scrappy@ki.net
Systems Administrator @ ki.net scrappy@freebsd.org
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