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Windows 7 > PHP 5.3.6 > Cannot set memory limit

Posted on 2011-09-27
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Last Modified: 2012-05-12
Tried setting the memory limit everywhere but no matter where I set it, it doesn't "take."  What am I missing?

C:\Users\Public>php -f md553_to_csv.php -d memory_limit=1512927291

Fatal error: Out of memory (allocated 524288) 
(tried to allocate 1512927290 bytes) in 
C:\Users\Public\md553_to_csv.php on line 3

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Here's the PHP code:
<?php
ini_set('memory_limit', '1512927291');
$lines = file('C:\Users\Public\CRMD3836.mask', FILE_IGNORE_NEW_LINES);
?>

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Question by:Geoff Millikan
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16 Comments
 
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Expert Comment

by:psimation
ID: 36711577
try to edit the php.ini file, and you will probably need to run your text editor as Administrator.
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Author Comment

by:Geoff Millikan
ID: 36713551
Further debugging shows the memory_limit is in fact getting changed - the issue has something to do with how big the file is (about 1.5GB) and the function, file().  The error seems to point to memory_limit bing the issue, but it's not.  

So not sure what the issue is, this is very strange.
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LVL 109

Expert Comment

by:Ray Paseur
ID: 36713910
A file of 1.5GB is kind of large for in-memory storage, even in this day and age.  Can you give us a URL link to the file and a sense of what you want to get out of the file, please?
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Author Comment

by:Geoff Millikan
ID: 36714325
Cannot give link but can tell you it's a big ASCII text file that we're parsing content out of, line-by-line.

In the mean time, we're using fopen(), fgets() and that works fine but still curious why file() doesn't work.
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LVL 109

Expert Comment

by:Ray Paseur
ID: 36716689
OK, please create a big ASCII text file that looks like what you want to work on.  Put it on a server where you can give the link.  To understand why we need to see the test data, please see the article here about how professional programmers approach problems with test-driven development.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_7830-A-Quick-Tour-of-Test-Driven-Development.html

Fopen() and fgets() read one line at a time, and this process uses relatively little memory.  File() reads the entire file into an array, thus ensuring that the largest possible representation of the file is loaded all at once.
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Author Comment

by:Geoff Millikan
ID: 36907950
This works:  Run this at Windows command line:
php -r "while (filesize('C:\Users\Public\I_AM_A_2GB_FILE.txt')<=2147483648) {file_put_contents('C:\Users\Public\I_AM_A_2GB_FILE.txt',substr(str_shuffle(str_repeat('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 ',5000)),0,262144), FILE_APPEND);}"

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Then run this:
C:\Users\Public>php -r "echo strlen(file_get_contents('C:\Users\Public\I_AM_A_2GB_FILE.txt'));" -d memory_limit=2500000000

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And you get this error:
Fatal error: Out of memory (allocated 524288) (tried to allocate 2147483648 bytes) in Command line code on line 1

Merry Christmas!
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Author Comment

by:Geoff Millikan
ID: 36907981
Actually, better to use this to make a 1GB file so we don't run into the 32bit integer issue described at  link below:
C:\Users\Public>php -r "while (filesize('C:\Users\Public\I_AM_A_1GB_FILE.txt')<=1073741824) {file_put_contents('C:\Users\Public\I_AM_A_1GB_FILE.txt',substr(str_shuffle(str_repeat('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 ',5000)),0,262144), FILE_APPEND);}"

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http://php.net/manual/en/function.filesize.php
Note:  Because PHP's integer type is signed and many platforms use 32bit integers, filesize() may return unexpected results for files which are larger than 2GB. For files between 2GB and 4GB in size this can usually be overcome by using sprintf("%u", filesize($file)).
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Author Comment

by:Geoff Millikan
ID: 36908009
Hold the phone, it's working now for 1GB file...
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Author Comment

by:Geoff Millikan
ID: 36908029
file_get_contents() works for me on files up to about 1,182,531,584 bytes but if the files go over 1,606,156,288 bytes it fails consistently:

Fatal error: Out of memory (allocated 524288) (tried to allocate 1606164480 bytes) in Command line code on line 1

And just to confirm, my system has that much RAM available:
 System RAM
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LVL 109

Expert Comment

by:Ray Paseur
ID: 36909126
Where is the link to the test file we asked for?

PHP has limits on the amount of memory it uses.  These may not be directly related to the amount of memory on the system -- it just depends on the PHP settings.
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Author Comment

by:Geoff Millikan
ID: 36913350
Ray_Paseur
Where is the link to the test file we asked for?

Cut and paste the script below and you will have your test data:
C:\Users\Public>php -r "while (filesize('C:\Users\Public\I_AM_A_1GB_FILE.txt')<=1073741824) {file_put_contents('C:\Users\Public\I_AM_A_1GB_FILE.txt',substr(str_shuffle(str_repeat('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 ',5000)),0,262144), FILE_APPEND);}"

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Follow instructions above to reproduce.  I don't believe this is a memory_limit ini file issue, much more complicated.  
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LVL 109

Assisted Solution

by:Ray Paseur
Ray Paseur earned 500 total points
ID: 36913460
Using either file_get_contents() or file() I get this:
Fatal error: Allowed memory size of 134,217,728 bytes exhausted (tried to allocate 1,406,935,040 bytes) in /home/websitet/public_html/RAY_temp_t1shopper.php on line 3

But when I change to the script below, allowing unlimited memory usage, I get this (commas inserted in output):
http://www.laprbass.com/RAY_temp_t1shopper.php
Outputs
int(2,815,164,416)
<?php // RAY_temp_t1shopper.php
error_reporting(E_ALL);
ini_set('memory_limit', -1);
$x = file('I_AM_A_1GB_FILE.txt');
$m = memory_get_peak_usage(TRUE);
var_dump($m);

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0
 

Author Comment

by:Geoff Millikan
ID: 36921608
What version of PHP are you running?  I'm running the Windows version of PHP 5.3.6 32bit on Windows 7 64bit.

Running this code:
<?php
$file='C:\Users\Public\I_AM_A_1GB_FILE.txt';
error_reporting(E_ALL);
ini_set('memory_limit', -1);
echo filesize($file), "\r\n";
echo ini_get('memory_limit'),"\r\n"; 
$x = file($file);
$m = memory_get_peak_usage(TRUE);
var_dump($m);
?>

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Produces this result:
c:\Users\Public>php -f "c:\Users\Public\memory_limit.php"
1548746752
-1

Fatal error: Out of memory (allocated 524288) (tried to allocate 1548754944 bytes) in C:\Users\Public\memory_limit.php on line 7

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LVL 109

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 36922283
I am running PHP on Linux.  Version 5.3.8...
http://www.laprbass.com/phpinfo.php
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Author Comment

by:Geoff Millikan
ID: 36922374
Ah ha!  Yes, this works for me on Linux no problem.  On Windows, it doesn't.  Must be a Windows issue with how RAM is allocated.
0
 

Author Closing Comment

by:Geoff Millikan
ID: 37015366
Bug in Windows version of PHP...
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