I'm guessing you have a 4 cpu box:
1 99 percent busy process on a 4 way box == about 25% busy overall.

On May 5, 2004, at 6:03 AM, Tom Lane wrote:

"Cyrille Bonnet" <[EMAIL PROTECTED]> writes:
Should I be worried that Postgres is eating up 99% of my CPU??? Or is this
*expected* behaviour?

It's not expected, unless you are running some very long-running query.

The conflict between what top says and what mpstat says is strange; I
wonder if you might have a buggy version of one of them?  You should
probably check some other tools (try "vmstat 1" for instance) to see if
you can get a consensus on whether the CPU is maxed out or not ...

                        regards, tom lane

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