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Re: Exhaustive memory allocation using arrays [message #181750 is a reply to message #181746]

Wed, 29 May 2013 11:00

Christoph Becker
Messages: 91
Registered: June 2012

Karma:

Member

tombert.at wrote:
> And, doubling the memory size by assigning a new value:
>
> for ($i=0; $i < 1000000; $i++) {
> $value[$i] = "23.4567890123";
> }
> for ($i=0; $i < 1000000; $i++) {
> $value[$i] = sprintf("%f", $value[$i]);
> }
>
> Now php is using ~400 MB

I *assume* that the strings in the first loop do not actually allocate a
struct str for every instance, but instead reference a single statically
allocated instance. The second loop is probably allocating a new struct
str for every sprintf().

Compare with:

for ($i=0; $i < 1000000; $i++) {
$value[$i] = "23.4567890123";
}
for ($i=0; $i < 1000000; $i++) {
$value[$i] = floatval($value[$i]);
}

--
Christoph M. Becker

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[Message index]

		Exhaustive memory allocation using arrays By: tombert.at on Wed, 29 May 2013 06:27
		Re: Exhaustive memory allocation using arrays By: tombert.at on Wed, 29 May 2013 06:42
		Re: Exhaustive memory allocation using arrays By: tombert.at on Wed, 29 May 2013 07:45
		Re: Exhaustive memory allocation using arrays By: Christoph Becker on Wed, 29 May 2013 11:00
		Re: Exhaustive memory allocation using arrays By: Denis McMahon on Wed, 29 May 2013 08:22
		Re: Exhaustive memory allocation using arrays By: The Natural Philosoph on Wed, 29 May 2013 08:54
		Re: Exhaustive memory allocation using arrays By: Thomas 'PointedEars' on Wed, 29 May 2013 13:30

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