Re: WIP: dynahash replacement for buffer table
| От | Amit Kapila |
|---|---|
| Тема | Re: WIP: dynahash replacement for buffer table |
| Дата | |
| Msg-id | CAA4eK1Ks1OCPdwapZNwHiqLOuUzzCXg7JB4RXNp-81_hnLzCUg@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: WIP: dynahash replacement for buffer table (Andres Freund <andres@2ndquadrant.com>) |
| Ответы |
Re: WIP: dynahash replacement for buffer table
|
| Список | pgsql-hackers |
On Tue, Oct 14, 2014 at 7:55 PM, Andres Freund <andres@2ndquadrant.com> wrote:
>
> On 2014-10-14 09:30:58 -0400, Robert Haas wrote:
> > A few years ago I started working on a concurrent hash table for
> > PostgreSQL. The hash table part of it worked, but I never did
> > anything with it, really. Amit mentioned to me earlier this week that
> > he was seeing contention inside the dynahash machinery, which inspired
> > me to go back and update the patch.
>
> Interestingly I've benchmarked similar loads, even on the same machine
> as Amit,
>
> On 2014-10-14 09:30:58 -0400, Robert Haas wrote:
> > A few years ago I started working on a concurrent hash table for
> > PostgreSQL. The hash table part of it worked, but I never did
> > anything with it, really. Amit mentioned to me earlier this week that
> > he was seeing contention inside the dynahash machinery, which inspired
> > me to go back and update the patch.
>
> Interestingly I've benchmarked similar loads, even on the same machine
> as Amit,
There is one catch here, for these profiles I am using Power-8 m/c
and the load is slightly higher (5000 scale factor).
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