| commit | 03a42c9652f8cc2c447840e39418b862c48fd41d | |
| author | Michael Paquier <michael@paquier.xyz> | |
| Mon, 18 Nov 2024 02:44:11 +0000 (18 11:44 +0900) | ||
| committer | Michael Paquier <michael@paquier.xyz> | |
| Mon, 18 Nov 2024 02:52:35 +0000 (18 11:52 +0900) | ||
| tree | 11a1da99cf7a0e9c86f68ab8b8085470bd725a4f | treesnapshot (tar.gz zip) |
| parent | 5be1dabd2ae0cf48d927aad363c4b65507e38b25 | commitdiff |
Use pg_memory_is_all_zeros() in PageIsVerifiedExtended()
Relying on pg_memory_is_all_zeros(), which would apply SIMD instructions
when dealing with an aligned page, is proving to be at least three times
faster than the original size_t-based comparisons when checking if a
BLCKSZ page is full of zeros. Note that PageIsVerifiedExtended() is
called each time a page is read from disk, and making it faster is a
good thing.
Author: Bertrand Drouvot
Discussion: https://postgr.es/m/CAApHDvq7P-JgFhgtxUPqhavG-qSDVUhyWaEX9M8_MNorFEijZA@mail.gmail.com
Relying on pg_memory_is_all_zeros(), which would apply SIMD instructions
when dealing with an aligned page, is proving to be at least three times
faster than the original size_t-based comparisons when checking if a
BLCKSZ page is full of zeros. Note that PageIsVerifiedExtended() is
called each time a page is read from disk, and making it faster is a
good thing.
Author: Bertrand Drouvot
Discussion: https://postgr.es/m/CAApHDvq7P-JgFhgtxUPqhavG-qSDVUhyWaEX9M8_MNorFEijZA@mail.gmail.com
| src/backend/storage/page/bufpage.c | diffblobblamehistory |