01-23-04 09:54 PM
Hmmm.... I would have used Iozone. It can show
you the performance when the aggregate data set
fits in the buffer cache, and when it does not.
See: http://www.iozone.org
"Gary Barnette" <gbarnette@adelphia.net> wrote in message
news:%ODsb.407$_i1.240424@news2.news.adelphia.net...quote:
> For those that may not know, Bonnie is a great little disk benchmark tool
> available on the net. Show Kbytes/second and %CPU time for different
write,quote:
> read, and seek tests.
>
> The setup:
> I haven't run Bonnie for awhile on a box (HP RP8400) and then I run it
> several times in a row. The first time it is run all of the write tests
arequote:
> from 2-4 times as slow (depending on which test) as all the other
subsequentquote:
> tests. The read tests are all very close, including the first time it is
> run.
>
> I'm sure it has something to do with buffer cache but I don't understand
> what.
>
> Anyone have an explanation? I would be glad to provide any other needed
> information.
>
> The reason I'm asking is that on another box of the same type, the write
> test never does get better, even after the first running of Bonnie and
thisquote:
> box has a bad write performance problem. I am trying desperately to fix
it.quote:
>
> Many Thanks,
> Gary
> gbarnette@adelphia.net
>
>
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