RE: Linux Disk Performance/File IO per process

Chris Evans (
Mon, 29 Jan 2001 13:26:40 +0000 (GMT)

On Mon, 29 Jan 2001 wrote:

> Thanks to both Jens and Chris - this provides the information I need to
> obtain our busy rate
> It's unfortunate that the kernel needs to be patched to provide this
> information - hopefully it will become part of the kernel soon.
> I had a response saying that this shouldn't become part of the kernel due to
> the performance cost that obtaining such data will involve. I agree that a
> cost is involved here, however I think it's up to the user to decide which
> cost is more expensive to them - getting the data, or not being able to see
> how busy their disks are. My feeling here is that this support could be user
> configurable at run time - eg 'cat 1 > /proc/getdiskperf'.


I disagree with this runtime variable. It is unnecessary complexity.
Maintaining a few counts is total noise compared with the time I/O takes.


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