Comments on: Log memory usage using declare and ticks in PHP http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/ Dave Marshall Mon, 08 Sep 2008 09:52:24 +0000 http://wordpress.org/?v=2.6.1 By: Chris http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-52732 Chris Mon, 26 May 2008 01:02:11 +0000 http://www.davedevelopment.co.uk/?p=59#comment-52732 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. 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 http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-52091 daveyboy Tue, 20 May 2008 07:34:25 +0000 http://www.davedevelopment.co.uk/?p=59#comment-52091 @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'. @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 http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-52074 Chris Tue, 20 May 2008 03:45:31 +0000 http://www.davedevelopment.co.uk/?p=59#comment-52074 You're better off logging the backtrace etc to a file, otherwise you are using a global variable which takes up memory itself. <?php 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"; You’re better off logging the backtrace etc to a file, otherwise you are using a global variable which takes up memory itself.

<?php

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 http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51984 Logging PHP script memory usage | PHP Readings Mon, 19 May 2008 09:55:57 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51984 [...] Marshall posted article about php script memory usage logging. Memory logging is important because you may know haw many [...] [...] Marshall posted article about php script memory usage logging. Memory logging is important because you may know haw many [...]

]]> By: Konr Ness http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51716 Konr Ness Fri, 16 May 2008 15:52:14 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51716 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'); 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 http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51493 EllisGL Wed, 14 May 2008 19:54:11 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51493 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. 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 http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51475 Link Bundle - May 14 | franzone.com Wed, 14 May 2008 16:49:27 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51475 [...] 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 [...] [...] 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 [...]

]]> By: daveyboy http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51467 daveyboy Wed, 14 May 2008 16:09:22 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51467 Thanks Mathieu, I've updated the post to recommend your comment. Thanks Mathieu, I’ve updated the post to recommend your comment.

]]> By: Mathieu Kooiman http://www.davedevelopment.co.uk/2008/05/12/log-memory-usage-using-declare-and-ticks-in-php/#comment-51457 Mathieu Kooiman Wed, 14 May 2008 14:53:22 +0000 http://www.davedevelopment.co.uk/?p=59#comment-51457 When you use an xdebug trace instead of profiling you'll get the memory usage per entry in the trace. Tad more work to go through, but probably more reliable than ticks.. http://xdebug.org/docs/execution_trace When you use an xdebug trace instead of profiling you’ll get the memory usage per entry in the trace.

Tad more work to go through, but probably more reliable than ticks..

http://xdebug.org/docs/execution_trace

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