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Date: Thu, 13 Apr 2023 08:53:06 +0200
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To: Rowan Tommins <rowan.collins@gmail.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] Re: Possible RFC: $_SERVER['REQUEST_TIME_FLOAT']
From: herbert@groot.jebbink.nl (Herbert Groot Jebbink)

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Op wo 12 apr. 2023 16:04 schreef Rowan Tommins <rowan.collins@gmail.com>:

> On Wed, 12 Apr 2023 at 13:25, Herbert Groot Jebbink <
> herbert@groot.jebbink.nl> wrote:
>
>> fallback for REQUEST_TIME and REQUEST_TIME_FLOAT to hrtime seems not
>> possible, hrtime is not based on the actual time, hrtime can be used to
>> calculate a duration or so, not to retrieve the actual time itself.
>>
>
> Fair enough, but that makes my first question all the more important: are
> there any situations or platforms where generating an hrtime value for
> every request would have a performance penalty?
>
> How does that performance (for everyone) compare with a single call to
> microtime(true) in your application to calculate the duration from
> REQUEST_TIME_FLOAT to start of profiling, with all subsequent profiling
> using hrtime?
>

ok, valid point, I also found out that setting a REQUEST_TIME_x variable at
that point is too late, the request has been going on for a while, that's
most likely the reason it's coming from the active SAPI and not from the
current time.

Thanks for the feedback, I will not file a RFC

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