On Tue, Aug 11, 2009 at 07:01:19PM -0400, Vishal Ahuja wrote:
> Hi Brendan,
> Thank you for the reply. I was referring to the file system cache.
> Sorry, I am not aware of io provider?
Ok; if you are interested in disk service time, then you can trace from
the disk driver or abstraction. The io provider does this:
http://wikis.sun.com/display/DTrace/io+Provider
Brendan
> Thanks,
> Vishal
>
> On Tue, Aug 11, 2009 at 6:47 PM, Brendan Gregg - Sun Microsystems
> <[1][email protected]> wrote:
>
> G'Day Vish,
> On Tue, Aug 11, 2009 at 03:39:01PM -0700, vhiz wrote:
> > Hi,
> >
> > I am trying to figure out the service time distribution for disk
> reads using dtrace. I am using Solaris Community edition, with UFS
> as the filesystem. I have written simple scripts which use fbt, but
> am not getting any consistency in my results. The biggest hindrance
> seems to be the caching effects. Any suggestions on how to get an
> average even though caching effects are there?
> Which cache do you mean? If you use the io provider, you should be
> close enough
> to disk access that you'll only be affected by the on-disk cache.
> On-disk cache
> hits are valid I/O anyway.
> Brendan
> --
> Brendan Gregg, Sun Microsystems Fishworks.
> [2]http://blogs.sun.com/brendan
>
> References
>
> 1. mailto:[email protected]
> 2. http://blogs.sun.com/brendan
--
Brendan Gregg, Sun Microsystems Fishworks. http://blogs.sun.com/brendan
_______________________________________________
dtrace-discuss mailing list
[email protected]
