We have a similar issue here. I don't know how the rd and wt figures are
calculated, but I have always received results similar to yours. Just to
verify, change your loop from 100 to 1000, 5000 and 1. On our system,
we received the following:
100 loops - 60 wt
1000 loops - 600 wt
5000 loops - 3000 wt
1 loops - 6000 wt
If you change the interval on the udstat command to 10 seconds, the wt
results changed to:
100 loops - 30 wt
1000 loops - 300 wt
5000 loops - 2000 wt
1 loops - 3000 wt
Clearly, there is a calculation involved in the wt numbers, I just don't
know what the calculation is. We have been using udstat for a while, to
help locate users that are not doing anything. So, in that respect, it is
accurate.. That is, if you see a bunch of zeros, the user is not
currently doing anything.
Charlie Rubeor
Unix/Database Admin
The Wiremold Company
800.338.1315 x3498
860.523.3690 fax
[EMAIL PROTECTED] wrote on 06/09/2005 04:09:16 AM:
While delivering a Unidata System Administration course today
I noticed an interesting feature of udstat. I had a simple program
the
contained a loop that performed one read and one write. The loop was
traversed
100 times.
udstat reported this as 200 reads and 600 writes. I ran this
several times to verify my findings.
Something doesn't add up. Has anyone else seen this? How
reliable are these figures?
Were there any indexes on the file?
This was a tiny static hashed file with no indices set up specifically
to
get some numbers into the udstat display. If I had been running anything
real, I would not have noticed the discrepency.
Maybe you'd like to try it... Create a tiny file, put in a few records
(or
even just one) and then run a program that loops around a known number
of
times reading and rewriting each record. If your figures look fine,
there is
something very odd going on with our server.
Martin Phillips
Ladybridge Systems
17b Coldstream Lane, Hardingstone, Northampton NN4 6DB
+44-(0)1604-709200
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