On 09/03/2013 05:27 PM, Robert Haas wrote: > On Thu, Aug 29, 2013 at 8:22 PM, Ants Aasma <a...@cybertec.at> wrote: >> I might give it a shot later this cycle as I have familiarized my self >> with the problem domain anyway. I understand the appeal of staying >> with what we have, but this would cap the speedup at 4x and has large >> caveats with the extra lookup tables. A 28x speedup might be worth the >> extra effort. > I agree. However, on the flip side, a bird in the hand is worth two > in the bush. A patch that just does the same thing faster is likely > to be less controversial than changing the algorithm, and does not > preclude changing the algorithm later. > Has anybody looked at the recent i5/i7 added hrdware support for CRC32 ?
http://www.strchr.com/crc32_popcnt >From number there it is probably still slower than xxhash, but it might be worth doing as an interim optimisation. Cheers -- Hannu Krosing PostgreSQL Consultant Performance, Scalability and High Availability 2ndQuadrant Nordic OÜ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
