Comments on: Log memory usage using declare and ticks in PHP

By: Online Money Making

Online Money Making — Wed, 02 Sep 2009 02:55:32 +0000

Nice work on that one Mathieu!

By: Oliver Nassar

Oliver Nassar — Tue, 16 Jun 2009 21:37:50 +0000

Check out: http://particletree.com/features/php-quick-profiler/
Should meet most of the needs discussed in this post.

By: Splitice

Splitice — Sun, 19 Apr 2009 23:25:59 +0000

You could always load into a shm or var cache like XCache

By: Chris

Chris — Mon, 26 May 2008 01:02:11 +0000

Hi Dave,

My example was to show that if you keep the memory usage in an array (which is stored *in memory*) – you get wrong results.

By: daveyboy

daveyboy — Tue, 20 May 2008 07:34:25 +0000

@Chris – Not really sure I follow you’re example. I agree logging to a file would be better for accuracy, but would slow your application down greatly, hence the ‘insert your logging code here’.

By: Chris

Chris — Tue, 20 May 2008 03:45:31 +0000

You’re better off logging the backtrace etc to a file, otherwise you are using a global variable which takes up memory itself.

echo “at line ” . __LINE__ . ” memory is ” . memory_get_usage(true) . “\n”;

$log = array();
for ($i = 0; $i microtime(true),
‘memory’ => memory_get_usage(true),
‘file’ => __FILE__
);
}

echo “at line ” . __LINE__ . ” memory is ” . memory_get_usage(true) . “\n”;

By: Logging PHP script memory usage | PHP Readings

Logging PHP script memory usage | PHP Readings — Mon, 19 May 2008 09:55:57 +0000

[...] Marshall posted article about php script memory usage logging. Memory logging is important because you may know haw many [...]

By: Konr Ness

Konr Ness — Fri, 16 May 2008 15:52:14 +0000

Very timely article. Thank you. I was debugging a large online store that was using 25+MB of memory on the first load. I modified it slightly to not use sessions, and also show which file and what line of the file was being run at each tick:

$memory_usage = array();
$start_time = microtime(true);
function log_memory(){
global $memory_usage;
global $start_time;
$stacktrace = debug_backtrace();
$memory_usage[] = array(
‘time’ => microtime(true) – $start_time,
‘memory’ => memory_get_usage(),
‘file’ => $stacktrace[1]['file'] . ‘:’ . $stacktrace[1]['line']
);
}

declare(ticks = 100);
register_tick_function(’log_memory’);

By: EllisGL

EllisGL — Wed, 14 May 2008 19:54:11 +0000

Watch out, register_tick_function will crashed on threaded servers. Also I haven’t been able to get it to work in a windows environment yet.

By: Link Bundle - May 14 | franzone.com

Link Bundle - May 14 | franzone.com — Wed, 14 May 2008 16:49:27 +0000

[...] Bundle – May 14 Author : Jonathan Franzone No Comments Log memory usage using declare and ticks in PHP Dave Marshall, a web developer living in Hull, England, share a really quick and simple trick to [...]