| From: | "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | RE: Popcount optimization using AVX512 |
| Date: | 2024-03-18 17:28:32 |
| Message-ID: | BL1PR11MB5304552343DD5E6DDD27A672DC2D2@BL1PR11MB5304.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> -----Original Message-----
> From: Nathan Bossart <nathandbossart(at)gmail(dot)com>
> Sent: Monday, March 18, 2024 9:20 AM
> ...
> I don't think David was suggesting that we need to remove the runtime checks
> for AVX512. IIUC he was pointing out that most of the performance gain is
> from removing the function call overhead, which your v8-0002 patch already
> does for the proposed AVX512 code. We can apply a similar optimization for
> systems without AVX512 by inlining the code for
> pg_popcount64() and pg_popcount32().
Ok, got you.
Question: I applied the patch for the drive_popcount* functions and rebuilt. The resultant server complains that the function is missing. What is the trick to make this work?
Another Question: Is there a reason "time psql" is used over the Postgres "\timing" command?
Thanks,
Paul
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