| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Aleksey Tsalolikhin <atsaloli(dot)tech(at)gmail(dot)com> |
| Cc: | pgsql-docs(at)postgresql(dot)org |
| Subject: | Re: what is a "working set" ? |
| Date: | 2012-04-23 23:48:50 |
| Message-ID: | 20120423234850.GA22081@momjian.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | 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(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Robert Haas | 2012-04-24 02:34:10 | Re: Date/Time Types : internals |
| Previous Message | Aleksey Tsalolikhin | 2012-04-23 23:43:25 | what is a "working set" ? |