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* High CPU usage from a vacuum process but does nothing
@ 2017-10-04 17:28 Boris S. <boris@splet.net>
2017-10-05 07:05 ` Re: High CPU usage from a vacuum process but does nothing Boris S. <boris@splet.net>
0 siblings, 1 reply; 2+ messages in thread
From: Boris S. @ 2017-10-04 17:28 UTC (permalink / raw)
To: pgsql-admin
After migrating the server to a bigger machine, I'm noticing an odd
behaviour. If I begin vacuuming manually, it starts OK:
<snip>
0 pages are entirely empty.
CPU 0.00s/0.00u sec elapsed 0.00 sec.
INFO: analyzing "public.table024484"
INFO: "table024484": scanned 111123 of 111123 pages, containing 4909226
live rows and 0 dead rows; 150000 rows in sample, 4909226 estimated
total rows
But then it gets stuck indefinitely with high CPU usage and command
never exits. kill -TERM isn't helping, process stays on with ~99% CPU
usage. Stracing this process gets me just:
strace: Process 102011 attached
strace: [ Process PID=102011 runs in x32 mode. ]
Which is an odd message, all other processes give normal strace output.
latest pgsql 9.5 (same on old and new machine)
Ubuntu 16.04
Values in "cat /proc/102011/io" stay the same.
Autovacuum and other processes, queries aren't affected and can be
straced normally. Disk IO is low (checked with iostat)
Any ideas on what else to try?
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^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: High CPU usage from a vacuum process but does nothing
2017-10-04 17:28 High CPU usage from a vacuum process but does nothing Boris S. <boris@splet.net>
@ 2017-10-05 07:05 ` Boris S. <boris@splet.net>
0 siblings, 0 replies; 2+ messages in thread
From: Boris S. @ 2017-10-05 07:05 UTC (permalink / raw)
To: pgsql-admin
To sum it up, after reboot it looks alright, vacuum finishes promptly.
On 04/10/2017 19:28, Boris S. wrote:
> After migrating the server to a bigger machine, I'm noticing an odd
> behaviour. If I begin vacuuming manually, it starts OK:
>
> <snip>
> 0 pages are entirely empty.
> CPU 0.00s/0.00u sec elapsed 0.00 sec.
> INFO: analyzing "public.table024484"
> INFO: "table024484": scanned 111123 of 111123 pages, containing
> 4909226 live rows and 0 dead rows; 150000 rows in sample, 4909226
> estimated total rows
>
> But then it gets stuck indefinitely with high CPU usage and command
> never exits. kill -TERM isn't helping, process stays on with ~99% CPU
> usage. Stracing this process gets me just:
>
> strace: Process 102011 attached
> strace: [ Process PID=102011 runs in x32 mode. ]
>
> Which is an odd message, all other processes give normal strace output.
>
> latest pgsql 9.5 (same on old and new machine)
> Ubuntu 16.04
>
> Values in "cat /proc/102011/io" stay the same.
>
> Autovacuum and other processes, queries aren't affected and can be
> straced normally. Disk IO is low (checked with iostat)
>
> Any ideas on what else to try?
>
>
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To make changes to your subscription:
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2017-10-04 17:28 High CPU usage from a vacuum process but does nothing Boris S. <boris@splet.net>
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