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From: Peter Eisentraut <[email protected]>
To: Andrey M. Borodin <[email protected]>
To: Hannu Krosing <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: What is a typical precision of gettimeofday()?
Date: Wed, 19 Jun 2024 17:44:45 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

On 18.06.24 07:47, Andrey M. Borodin wrote:
> 
> 
>> On 19 Mar 2024, at 13:28, Peter Eisentraut <[email protected]> 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).

AFAICT, pg_test_timing doesn't use gettimeofday(), so this doesn't 
really address the original question.

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