Re: [PERFORM] very high CPU usage in "top", but not in "mpstat"
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 ---(end of broadcast)--- TIP 8: explain analyze is your friend ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
Re: [PERFORM] very high CPU usage in "top", but not in "mpstat"
"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 ---(end of broadcast)--- TIP 8: explain analyze is your friend
[PERFORM] very high CPU usage in "top", but not in "mpstat"
Hello all, We are using Postgres 7.3 with JBoss 3.2.3 on a Linux Fedora 1.0 box. When I am looking at CPU activity with “top”, I often see something like: PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 14154 postgres 25 0 3592 3592 2924 R 99.1 0.3 93:53 0 postmaster At the same time, “mpstat” gives me something like: 11:27:21 AM CPU %user %nice %system %idle intr/s 11:27:21 AM all 2.99 0.00 18.94 78.08 105.94 The system is not visibly slow and response time is satisfactory. Sometimes, the CPU usage drops to 1 or 2%, but not for long usually. Also I have checked the number of open connections to Postgres and there are only 5 (maximum is set to the default: 32). Should I be worried that Postgres is eating up 99% of my CPU??? Or is this *expected* behaviour? Please note that I am a developer, not a system administrator, so maybe I misunderstand the usage of “top” here. Any help will be appreciated. Cyrille.
