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* what is a "working set" ?
@ 2012-04-23 23:43 Aleksey Tsalolikhin <atsaloli.tech@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Aleksey Tsalolikhin @ 2012-04-23 23:43 UTC (permalink / raw)
To: pgsql-docs
Hi. I'm trying to find a definition of "working set", it seems
important for performance tuning, but I cannot find a PostgreSQL
document defining it.
Yours,
Aleksey
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: what is a "working set" ?
@ 2012-04-23 23:48 Bruce Momjian <bruce@momjian.us>
parent: Aleksey Tsalolikhin <atsaloli.tech@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: Bruce Momjian @ 2012-04-23 23:48 UTC (permalink / raw)
To: Aleksey Tsalolikhin <atsaloli.tech@gmail.com>; +Cc: pgsql-docs
On Mon, Apr 23, 2012 at 04:43:25PM -0700, Aleksey Tsalolikhin wrote:
> Hi. I'm trying to find a definition of "working set", it seems
> important for performance tuning, but I cannot find a PostgreSQL
> document defining it.
That is a great question, and I plan to write a blog about it soon.
Working set is from the mainframe days and tries to represent how much
data you "touch" during a specified period of time, e.g. a 5-minute
working set is the amount of data you typically access (and maybe write)
in a 5-minute period. It is _very_ hard to get that information right
now from Postgres, and getting that information for a typical Unix
process isn't easy either.
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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2012-04-23 23:43 what is a "working set" ? Aleksey Tsalolikhin <atsaloli.tech@gmail.com>
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