* measuring disk IO / throughput?
@ 2007-06-16 19:59 Tomasz Chmielewski
0 siblings, 0 replies; only message in thread
From: Tomasz Chmielewski @ 2007-06-16 19:59 UTC (permalink / raw)
To: systemtap
Does anyone have a handy script to measure disk IO / throughput?
I'm testing a filesystem, but it seems to me that something strange
happens, and much more data than expected gets to the disk (i.e.,
writing 1 MB file is really 10 MB of data sent to the device).
I tried iostat-scsi.stp from the wiki, but it doesn't work for me (it
doesn't work for PATA-over-SATA and USB block devices, does it?), and it
doesn't report data volume.
Ideally, I'd like to see a script which outputs this kind of information
for all or chosen disks:
Already in iostat-scsi.stp:
- blocks read
- blocks written
- blocks read/s
- blocks written/s
This is what I'm looking for (for all kinds of block devices, not just
SCSI):
- kB read
- kB written
- kB read/s
- kB written/s
Would be nice to have:
- read requests
- write requests
- read requests/s
- write requests/s
Anyone?
--
Tomasz Chmielewski
http://wpkg.org
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