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Re: Enabling Checksums

Ants Aasma <ants@cybertec.at>

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From: Ants Aasma <ants@cybertec.at>
To: Ants Aasma <ants@cybertec.at>
Cc: Jeff Davis <pgsql@j-davis.com>, Bruce Momjian <bruce@momjian.us>, Greg Smith <greg@2ndquadrant.com>, Heikki Linnakangas <hlinnakangas@vmware.com>, Simon Riggs <simon@2ndquadrant.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2013-04-09T07:39:35Z
Lists: pgsql-hackers 
On Tue, Apr 9, 2013 at 5:35 AM, Ants Aasma <ants@cybertec.at> wrote:
> Quick bench results on the worst case workload:
> master no checksums: tps = 15.561848
> master with checksums: tps = 1.695450
> simd checksums: tps = 14.602698

For reference, results for the generic version, with default build
params and with the ones required for vectorizing:
simd checksums generic: tps = 6.683347
simd checksums generic vectorized: tps = 12.755203

It would be great if we could hint other platforms about the
vectorization possibilities. Unfortunately I'm not strong enough in
portability fu to come up with the necessary incantations to make all
compilers dance to my will.

Regards,
Ants Aasma
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