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Re: php daemon [message #179624 is a reply to message #179623]

Wed, 14 November 2012 21:33

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 11/14/2012 3:19 PM, Christoph Becker wrote:
> 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?
>

Yes, and if a variable has been unset, it's storage is no longer being
used by PHP. It's in the pool to be cleaned up by the garbage
collector, but that's different.

> 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.
>

That is correct.

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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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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