| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Greg Smith <greg(at)2ndquadrant(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Initial 9.2 pgbench write results |
| Date: | 2012-02-20 06:27:37 |
| Message-ID: | CA+TgmoZtEKgiE-TyzV4quyDhtgO-rLE0e2+kAwhVv-Mc6amW_w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Feb 19, 2012 at 11:12 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
> I'm collecting one last bit of data before posting another full set of
> results, but I'm getting more comfortable the issue here is simply changes
> in the BGW behavior. The performance regression tracks the background
> writer maximum intensity.
That's really quite fascinating... but it seems immensely
counterintuitive. Any idea why? BufFreelist contention between the
background writer and regular backends leading to buffer allocation
stalls, maybe?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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