| From: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
|---|---|
| To: | <david(at)lang(dot)hm>, "Kevin Grittner" <Kgrittn(dot)CCAP(dot)Courts(at)wicourts(dot)gov> |
| Cc: | "Robert Haas" <robertmhaas(at)gmail(dot)com>, "Greg Smith" <gsmith(at)gregsmith(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>, "Scott Carey" <scott(at)richrelevance(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)sun(dot)com> |
| Subject: | Re: Proposal of tunable fix for scalability of 8.4 |
| Date: | 2009-03-16 16:53:39 |
| Message-ID: | 49BE3DC3.EE98.0025.0@wicourts.gov |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
I wrote:
> One more reason this point is an interesting one is that it is one
> that gets *worse* with the suggested patch, if only by half a
percent.
>
> Without:
>
> 600: 80: Medium Throughput: 82632.000 Avg Medium Resp: 0.005
>
> with:
>
> 600: 80: Medium Throughput: 82241.000 Avg Medium Resp: 0.005
Oops. A later version:
> Redid the test with - waking up all waiters irrespective of shared,
> exclusive
> 600: 80: Medium Throughput: 82920.000 Avg Medium Resp: 0.005
The one that showed the decreased performance at 800 was:
> a modified Fix (not the original one that I proposed but something
> that works like a heart valve : Opens and shuts to minimum
> default way thus controlling how many waiters are waked up )
-Kevin
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