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 <5499E5A4.2080106@gmail.com> <alpine.DEB.2.11.1412241115530.4080@whisky.home.derickrethans.nl>
Date: Sat, 27 Dec 2014 15:41:06 +0400
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To: Derick Rethans <derick@php.net>
Cc: Stanislav Malyshev <smalyshev@gmail.com>, Jacob Bednarz <jacob.bednarz@gmail.com>, 
	PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Line profiler for PHP
From: crocodile2u@gmail.com (Crocodile)

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Hello Jacob

Take a look at http://pinba.org/ . While this is probably not exactly (or
may be even not at all) the thing you asked for, it is definitely
interesting. It allows for some profiling *right on production. *There are
certain things that you only experience under heavy load, and this tool may
let you know what's happening.

Cheers,
Victor


2014-12-24 14:16 GMT+03:00 Derick Rethans <derick@php.net>:

> On Tue, 23 Dec 2014, Stanislav Malyshev wrote:
>
> > > The questions I have are: - Is this even possible?
> >
> > Yes, should be possible but:
> > 1. If you want precision, it would slow down your code a lot, as
> > basically you need to record timing of each opcode, which can be very
> > expensive.
> > 2. If you're ok with less precision, you can do sampling, but in that
> > case you probably need your script to spend a lot of time in the same
> > areas of the code to have any meaningful results, otherwise it'd be just
> > random.
> >
> > > - Are there any projects out there or being worked on that achieve
> > > this?
> >
> > Most of the profilers afaik go by functions. Most probably because
> > line-level profiling would be so intrusive as to not produce really
> > valid results, but maybe it can be done in a way that is not that
> > intrusive.
>
> I have played with it for Xdebug, but it was too much of a slow down to
> be of any use...
>
> cheers,
> Derick
>
> --
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