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- Path: sparky!uunet!mcsun!uknet!bcc.ac.uk!link-1.ts.bcc.ac.uk!ucacmsu
- From: ucacmsu@ucl.ac.uk (Mr Stephen R Usher)
- Newsgroups: comp.arch
- Subject: Re: IDE faster than Mips SCSI disk
- Message-ID: <1992Nov10.160539.34153@bas-a.bcc.ac.uk>
- Date: 10 Nov 92 16:05:39 GMT
- References: <MAD.92Nov7220823@amber.math.keio.ac.jp> <k2.721260853@woodstock> <6215@tuegate.tue.nl>
- Sender: news@ucl.ac.uk (Usenet News System)
- Organization: Bloomsbury Computing Consortium, London
- Lines: 43
-
- In article <6215@tuegate.tue.nl> tgcpwd@urc.tue.nl writes:
- >Klaus Steinberger writes:
- >> 1520363 bytes/second for writing the file
- >> 1736771 bytes/second for reading the file
- >
- >Others have written results for ordinary 386s with plain IDE disk
- >in the range of 200-500 kB/s. I tried it at my home PC and I got
- >similar results.
- >
- >However, I always thought that those VAX/VMS machines at work were
- >awfully slow. So I tried iozone there too. It compiled without a
- >glitch, and gave results in various machines (workstations up to
- >large VAX-6410s) with various disks (RA type, RF type, other)
- >results in the range 15-40 kB/s.
- >
- >What does this mean: Are the disks really that slow? Is the VMS
- >version of iozone different? Is the OS that significant?
-
- VMS I/O is a dog when used in the way iozone does. Iozone, written in C
- using the standard I/O library has to use the VMS RMS sub-system, then
- "low-level" open(), read() and write() calls are very high level under VAXC.
- To get any sort of I/O performance under VMS you have to go low-level with
- SYS$QIO system calls, and only then with very large block reads and writes.
-
- >
- >Since this threads seems to acknowledge the presence of people
- >knowledgeable on hard disk, I thought I might as well ask this.
- >
- >Met vriendelijke groeten, Wim `Blue Baron' van Dorst
- >--
- >---------------------------------------------------------------------
- >Blue Baron = Wim van Dorst, Voice (+31) 074-443937, (+31) 02152-42319
- >(-: baron@clifton.hobby.nl tgcpwd@urc.tue.nl WvD@Akzo.400net.nl :-)
- >---------------------------------------------------------------------
-
- Steve
-
- PS. I wish there were a (68)030BSD which would run on my Atari TT as well as
- 386BSD :-).
- --
- Addresses:-
- JANET:- ucacmsu@uk.ac.ucl or steve@uk.ac.ox.earth (preferable)
- Internet:- ucacmsu@ucl.ac.uk or steve@earth.ox.ac.uk (preferable)
-