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Does it most likely waiting for the I/O causing the low CPU utilization?

February 05, 2003 - am UTC it would be anything that causes your application to block and wait IO is a biggy enqueue waits (waiting on a lock) would be another look at the big waits -- those are generally the things you are doing when you are not using the CPU Thanks Tom.

60% utilisation), then you are wasting money - you only need 6 checkout staff.

On the other hand, if on average all 10 staff are busy all the time (100% utilisation) then either you have just the right number, or maybe you haven't got enough.

but, if you snapshot, wait, snapshot and then find out you have 1.1 cpu seconds and the wait was say 2 seconds long, you know you were 50% on cpu for example.... We had time to spot and fix the problem because we were not short of cpu. What if I need more power all of a sudden, and I can't scale ? But I can keep my cyles from being used in case I need them. I think it's a matter of choices and opinions, and above all -- experience. Sure, you can buy boxes 50% bigger then you need "just in case", or you can move stuff around and get away with 1/3 the computing power. Let's say that here is an application that uses 100% of the cpu for 10min every day. So, you are going to double your costs for 10 minutes?

Had we been, probably we'd have had a hard time with our end-users. Other "common sense" things I hear all of the time: o rebuild indexes on a schedule. This means that your server won't be able to respond to any other request in the mean time. or maybe fix that so it uses 50% of the cpu for 20 minutes? Dear Tom, You have said: "Are you at 100% utilization?

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