PHP: Get CPU usage of ImageMagick/GraphicsMagick

Question

In PHP, is there a way I can capture what the CPU usage is of each ImagaMagick/GraphicsMagick method I execute? Memory usage would be nice, too.

Basically, I'm trying to benchmark how much resources each library uses in my application.

Failed attempt:

exec('convert a.jpg a.png');

$result = array();

// Loop until process is detected
do
{
    exec('ps -eo comm,%cpu,%mem | grep ' . "convert", $result);
}
while($result === array());

// Display the changing CPU and memory usage of the process
do
{
    print_r($result);
    exec('ps -eo comm,%cpu,%mem | grep ' . "convert", $result);
}
while($result !== array());

Answer 1

Memory usage should be a matter of recording the output of memory_get_usage(true) and memory_get_peak_usage(true) before and after each call you want to measure, then subtracting them.

CPU usage I'm not sure about. On unix systems it could involve doing exec() to get the output of ps -ef | grep $phpPid, then parsing that. You can get $phpPid = getmypid();