| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
| Cc: | Hannu Krosing <hannuk(at)google(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: What is a typical precision of gettimeofday()? |
| Date: | 2025-07-08 19:29:48 |
| Message-ID: | 900154.1752002988@sss.pgh.pa.us |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Andrey Borodin <x4mmm(at)yandex-team(dot)ru> writes:
>> On 8 Jul 2025, at 23:07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> The fact that the clock tick is about 40ns is extremely
>> obvious in this presentation.
> FWIW while working on UUID v7 Masahiko found that if we try to read real time with clock_gettime(CLOCK_REALTIME,) measurement is truncated to microseconds.
Yeah. Bear in mind that instr_time.h uses CLOCK_MONOTONIC_RAW on
macOS, so that's what we're looking at here.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Álvaro Herrera | 2025-07-08 19:37:00 | Re: Support for 8-byte TOAST values (aka the TOAST infinite loop problem) |
| Previous Message | Zhou, Zhiguo | 2025-07-08 19:11:46 | [RFC] Enhance scalability of TPCC performance on HCC (high-core-count) systems |