[Resolved] Memory Usage by Script (Please Help!)

[rubric]

I need to know how much memory a script is using up during its process. I'm running PHP/MySQL on Apache under RedHat Linux 9.0.

I'm building a site for someone and we are anticipating a good load of users (not visitors) and I need to make sure the script is not using-up too much memory.

Thanks.

[Weedpacket]

There's a function called [man]memory_get_usage[/man].

[rubric]

Thanks WeedPacket. I went to php.net and searched for that function and found that it doesn't work because I need version 4.3.2. However, there was a message posted at the bottom providing a way to get the percentage of memory used by the Apache process.

I went ahead and tweaked it a little and created a function that will return the amount of memory used (not percentage) in KBytes. Here it is:

/*
	This function will automatically select the Apache
	process id, or which ever web service you are using.
	If you want to specify the process id, you can do so
	by sending it the id number in the function call.
*/
function memory_usage($pid = "") {
	if ($pid == "")
		$pid = getmypid();
	exec("ps -eo rss,pid | grep $pid",$output);
	return strtok(trim($output[0])," ");
}
/*
	To use this properly, call it at the beginning of your script and at the end.
	Then take the difference between the two values and that is the total amount
	of memory used by your script.

Ex.
*/

$starting_amount = memory_usage();

// your script here...

$ending_amount = memory_usage();

echo "Total Memory Used by this script: ".($ending_amount - $starting_amount)." KBytes";

This function will only work in UNIX/Linux.

I'm experiencing only one problem with this function. If I hit refresh on my browser enough times, then Apache will stop "growing" in size. The difference of the starting amount and the ending amount will be zero. I think it has something to do with caching, but I'm not sure.

I do not know if this will work for everyone. If you have any suggestions, please post them here.

Thank you.

Rubric

[drawmack]

This will also only work is safe mode is turned off.