Re: Extremely high CPU usage when building tables
| От | Rajesh Kumar Mallah |
|---|---|
| Тема | Re: Extremely high CPU usage when building tables |
| Дата | |
| Msg-id | AANLkTikyK6EtgIinzPIOwhokGJvR1Oq_fsHrUzA-k2we@mail.gmail.com обсуждение исходный текст |
| Ответ на | Extremely high CPU usage when building tables (Deborah Fuentes <dfuentes@eldocomp.com>) |
| Ответы |
Re: Extremely high CPU usage when building tables
|
| Список | pgsql-performance |
Hi,
1. Did you also check vmstat output , from sar output the i/o wait is not clear.
2. i gues you must be populating the database between creating tables and creating
indexes. creating indexes require sorting of data that may be cpu intensive, loading/populating
the data may saturate the i/o bandwidth . I think you should check when the max cpu utilisation
is taking place exactly.
regds
Rajesh Kumar Mallah.
1. Did you also check vmstat output , from sar output the i/o wait is not clear.
2. i gues you must be populating the database between creating tables and creating
indexes. creating indexes require sorting of data that may be cpu intensive, loading/populating
the data may saturate the i/o bandwidth . I think you should check when the max cpu utilisation
is taking place exactly.
regds
Rajesh Kumar Mallah.
On Sat, Jun 26, 2010 at 3:55 AM, Deborah Fuentes <dfuentes@eldocomp.com> wrote:
Hello,
When I run an SQL to create new tables and indexes is when Postgres consumes all CPU and impacts other users on the server.
We are running Postgres 8.3.7 on a Sun M5000 with 2 x quad core CPUs (16 threads) running Solaris 10.
I've attached the sar data at the time of the run- here's a snip-it below.
Any ideas would be greatly appreciated.
Thanks!
Deb
****************************************************
Here, note the run queue, the left column. That is the number of processes waiting to run. 97 processes waiting to run at any time with only eight CPU cores looks very busy.
root@core2 # sar -q 5 500
SunOS core2 5.10 Generic_142900-11 sun4u 06/17/2010
12:01:50 runq-sz %runocc swpq-sz %swpocc
12:01:55 1.8 80 0.0 0
12:02:00 1.0 20 0.0 0
12:02:05 1.0 20 0.0 0
12:02:10 0.0 0 0.0 0
12:02:15 0.0 0 0.0 0
12:02:21 3.3 50 0.0 0
12:02:26 1.0 20 0.0 0
12:02:31 1.0 60 0.0 0
12:02:36 1.0 20 0.0 0
12:02:42 27.0 50 0.0 0
12:02:49 32.8 83 0.0 0
12:02:55 76.0 100 0.0 0
12:03:01 66.1 100 0.0 0
12:03:07 43.8 100 0.0 0
12:03:13 52.0 100 0.0 0
12:03:19 91.2 100 0.0 0
12:03:26 97.8 83 0.0 0
12:03:33 63.7 100 0.0 0
12:03:39 67.4 100 0.0 0
12:03:47 41.5 100 0.0 0
12:03:53 82.0 83 0.0 0
12:03:59 88.7 100 0.0 0
12:04:06 87.7 50 0.0 0
12:04:12 41.3 100 0.0 0
12:04:17 94.3 50 0.0 0
12:04:22 1.0 20 0.0 0
12:04:27 3.3 60 0.0 0
12:04:32 1.0 20 0.0 0
12:04:38 0.0 0 0.0 0
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