| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: WIP: dynahash replacement for buffer table |
| Date: | 2014-10-14 15:00:45 |
| Message-ID: | CAA4eK1Ks1OCPdwapZNwHiqLOuUzzCXg7JB4RXNp-81_hnLzCUg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Oct 14, 2014 at 7:55 PM, Andres Freund <andres(at)2ndquadrant(dot)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,
There is one catch here, for these profiles I am using Power-8 m/c
and the load is slightly higher (5000 scale factor).
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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