| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Staale Smedseng <Staale(dot)Smedseng(at)Sun(dot)COM> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Why are we waiting? |
| Date: | 2008-02-06 18:03:36 |
| Message-ID: | 1202321016.29242.114.camel@ebony.site |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Wed, 2008-02-06 at 18:44 +0100, Staale Smedseng wrote:
> > What is the frequency distribution of lock wait time on ProcArrayLock?
>
> See below for wait time distributions for ProcArrayLock (both shared and
> exclusive). The time measured is from entry into LWLockAcquire() until
> return. I've recorded the same data in two different resolutions (ms,
> and us for the lower part of the distribution). The DTrace script is at
> the bottom.
>
> These results are for 1000 TPC-C like clients, and measured over the
> 1000 PostgreSQL processes over a period of 10 seconds.
Thanks! Interesting resonance pattern.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Staale Smedseng | 2008-02-06 18:35:25 | Re: Why are we waiting? |
| Previous Message | Josh Berkus | 2008-02-06 17:58:48 | Re: PostgreSQL 8.4 development plan |