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- Newsgroups: comp.arch
- Path: sparky!uunet!spool.mu.edu!yale.edu!ira.uka.de!math.fu-berlin.de!informatik.tu-muenchen.de!LRZnews!k2
- From: k2@bl.physik.tu-muenchen.de (Klaus Steinberger)
- Subject: Re: IDE faster than Mips SCSI disk
- Message-ID: <k2.721304278@woodstock>
- Sender: news@news.lrz-muenchen.de (Mr. News)
- Organization: Leibniz-Rechenzentrum, Muenchen (Germany)
- References: <1992Nov6.033942.21194@ntuix.ntu.ac.sg> <MAD.92Nov7220823@amber.math.keio.ac.jp> <k2.721260853@woodstock> <6215@tuegate.tue.nl>
- Date: Mon, 9 Nov 1992 10:17:58 GMT
- Lines: 35
-
- tgcpwd@rw9.urc.tue.nl (Wim van Dorst) 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?
- I did the same test with same results, and I suspect its due to
- a very bad implementation off the read/write call emulation in VAXCRTL .
-
- I did have VMS Posix running on my VAX, and it gives indeed better
- results. I'm seeing results in the 200 - 300 kBytes/sec range.
- (A little MVIII, with SMD disks, platter rate around 2Mb/sec).
- I did not know how well the Posix environment did emulate Unix
- system calls, so I think native VMS programs with their ugly $QIO
- interface will see better rates.
-
- Sincerely,
- Klaus
- --
- Klaus Steinberger Beschleunigerlabor der TU und LMU Muenchen
- Phone: (+49 89)3209 4287 Hochschulgelaende
- FAX: (+49 89)3209 4280 D-8046 Garching, Germany
- Internet: Klaus.Steinberger@Physik.Uni-Muenchen.DE
-