If you have a very large disk cache then the cached read can be fast (since
it gets part of the file from memory)
Running the test on a compressed NTFS volume is also interesting, it is very
slow except for the cached read which often takes less than a second :-)
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Tony Blomfield
> Sent: Tuesday, 15 June 1999 10:53
> To: Multiple recipients of list offtopic
> Subject: Re: [DUG-OFFTOPIC]: NT Speed
>
>
> I got 6 - 8 M on two drives, but my older drive returned 16M on
> Cached Reads
> against 3M on Cached writes. Interesting.
> -----Original Message-----
> From: Ian Farquharson <[EMAIL PROTECTED]>
> To: Multiple recipients of list offtopic <[EMAIL PROTECTED]>
> Date: Monday, 14 June 1999 23:06
> Subject: [DUG-OFFTOPIC]: NT Speed
>
>
> >Recently I noticed my machine was getting a bit sluggish. It
> runs NT4 on a
> >NTFS disk. I looked around for a reliable way to test the disk
> speed but in
> >the end I wrote a simple program myself (attached).
> >
> >It simply writes a big file and then reads it (using the
> unbuffered option
> >of CreateFile). The results were very interesting, my disk was
> running at 2
> >MB/s or less.
> >
> >The NTFS disk was quite full and fragmented, so I cleared some space and
> >eventually got it defragged (not as easy as it sounds :-). The speed went
> up
> >to 8 MB/s for reads and my machine was no longer sluggish :-)
> >
> >I thought other people would be interesting in trying the
> program on their
> >disks to see if they are getting the performance they expect. Just run
> >"disktest x:" where x is the drive letter you want to test. It creates a
> >100M temp file called disktest.tmp in the root directory which it deletes
> >when the test finishes.
> >
> >You can capture the output using the normal method "disktest c: >
> >results.txt". Also attached is the source code so you can see
> what it does
> >and the results from my machine.
> >
> >I have tested it on several machines and most disks run about 6-8 MB/s. I
> >would be interested in hearing if anyone gets better than 10
> MB/s (and what
> >model disk so I can buy one :-)
> >
> >I tried different BIOS settings and learnt some interesting
> things. Turning
> >off Prefetch slowed things a lot but the other options made no
> difference.
> >Of course NT uses its own drivers for the disk.
> >
>
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