I plan to send patch to pg_test_timing in a day or two the underlying time precision on modern linux seems to be
2 ns for some Intel CPUs 10 ns for Zen4 40 ns for ARM (Ampere) --- Hannu | On Tue, Jun 18, 2024 at 7:48 AM Andrey M. Borodin <x4...@yandex-team.ru> wrote: > > > > On 19 Mar 2024, at 13:28, Peter Eisentraut <pe...@eisentraut.org> wrote: > > > > I feel that we don't actually have any information about this > portability concern. Does anyone know what precision we can expect from > gettimeofday()? Can we expect the full microsecond precision usually? > > At PGConf.dev Hannu Krossing draw attention to pg_test_timing module. I’ve > tried this module(slightly modified to measure nanoseconds) on some > systems, and everywhere I found ~100ns resolution (95% of ticks fall into > 64ns and 128ns buckets). > > I’ll add cc Hannu, and also pg_test_timing module authors Ants ang Greg. > Maybe they can add some context. > > > Best regards, Andrey Borodin.
