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Re: php daemon [message #179623 is a reply to message #179613]

Wed, 14 November 2012 20:19

Christoph Becker
Messages: 91
Registered: June 2012

Karma:

Member

Jerry Stuckle wrote:
> I thought of something else you may be misunderstanding. This is NOT
> the amount of memory allocated to PHP by the OS. That is in multiples
> of 4K blocks (for Intel architecture). It is the amount actually
> allocated for use by PHP. Once that figure reaches the maximum memory
> defined in the php.ini file, no more memory can be allocated by the script.

I'm aware of the $real_usage parameter of memory_get_usage() and the
different results reported according to the value of this parameter.
And I assume, that the following invariant holds:

memory_get_usage(true) >= memory_get_usage(false)

> Your interpretation would provide pretty worthless information as it
> would not give a true account of memory being used.

Isn't the true amount of memory being used by PHP (independent on how
much is allocated by the OS) the relevant information for the given test?

However, reading
<http://www.php.net/manual/en/features.gc.collecting-cycles.php> and
<https://wiki.php.net/internals/zend_mm> still let's me assume, that
zvals which refcount drops to zero are immediately freed (/not
necessarily given back to the OS, though/). The following test
/supports/ my assumption (it's no prove, though):

for ($i = 0; $i < 99; $i++) {
for ($j = 0; $j < 10000; $j++) {
$a = uniqid();
}
echo memory_get_usage(true), "\n";
}

Even if 990,000 uniqid()s (having 13 bytes each) will be allocated, on
my PHP 5.4.7 on Windows XP the output are 99 lines with 262144,
independent of the setting of zend.enable_gc.

--
Christoph M. Becker

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[Message index]

		php daemon By: SL on Sun, 11 November 2012 17:18
		Re: php daemon By: Jerry Stuckle on Sun, 11 November 2012 19:04
		Re: php daemon By: Christoph Becker on Sun, 11 November 2012 20:05
		Re: php daemon By: Jerry Stuckle on Sun, 11 November 2012 20:35
		Re: php daemon By: Christoph Becker on Sun, 11 November 2012 21:22
		Re: php daemon By: Jerry Stuckle on Sun, 11 November 2012 21:36
		Re: php daemon By: Christoph Becker on Sun, 11 November 2012 22:17
		Re: php daemon By: Jerry Stuckle on Sun, 11 November 2012 23:11
		Re: php daemon By: Christoph Becker on Mon, 12 November 2012 13:35
		Re: php daemon By: Jerry Stuckle on Mon, 12 November 2012 13:38
		Re: php daemon By: Jerry Stuckle on Tue, 13 November 2012 12:44
		Re: php daemon By: Christoph Becker on Wed, 14 November 2012 20:19
		Re: php daemon By: Jerry Stuckle on Wed, 14 November 2012 21:33
		Re: php daemon By: Christoph Becker on Wed, 14 November 2012 22:13
		Re: php daemon By: Jerry Stuckle on Thu, 15 November 2012 12:41
		Re: php daemon By: Christoph Becker on Thu, 15 November 2012 15:55
		Re: php daemon By: SL on Mon, 12 November 2012 15:45
		Re: php daemon By: The Natural Philosoph on Mon, 12 November 2012 16:08
		Re: php daemon By: Goran on Tue, 13 November 2012 07:57
		Re: php daemon By: Jerry Stuckle on Tue, 13 November 2012 12:47
		Re: php daemon By: Goran on Tue, 13 November 2012 13:54
		Re: php daemon By: The Natural Philosoph on Tue, 13 November 2012 14:13
		Re: php daemon By: Jerry Stuckle on Tue, 13 November 2012 17:23
		Re: php daemon By: Goran on Wed, 14 November 2012 07:43
		Re: php daemon By: Jerry Stuckle on Wed, 14 November 2012 10:51
		Re: php daemon By: Goran on Thu, 15 November 2012 13:08
		Re: php daemon By: Jerry Stuckle on Thu, 15 November 2012 13:46
		Re: php daemon By: Goran on Thu, 15 November 2012 15:09
		Re: php daemon By: Jerry Stuckle on Thu, 15 November 2012 16:25
		Re: php daemon By: Tim Streater on Thu, 15 November 2012 16:20

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