phpprofiling

Simplest way to profile a PHP script

What's the easiest way to profile a PHP script?

I'd love tacking something on that shows me a dump of all function calls and how long they took, but I'm also OK with putting something around specific functions.

I tried experimenting with the microtime function:

$then = microtime();
myFunc();
$now = microtime();

echo sprintf("Elapsed:  %f", $now-$then);

But that sometimes gives me negative results. Plus it's a lot of trouble to sprinkle that all over my code.

Solution

  • The PECL APD extension is used as follows:

    <?php
apd_set_pprof_trace();

// The rest of the script
?>

    After, parse the generated file using pprofp.

    Example output:

    Trace for /home/dan/testapd.php
Total Elapsed Time = 0.00
Total System Time  = 0.00
Total User Time    = 0.00


Real         User        System             secs/    cumm
%Time (excl/cumm)  (excl/cumm)  (excl/cumm) Calls    call    s/call  Memory Usage Name
--------------------------------------------------------------------------------------
100.0 0.00 0.00  0.00 0.00  0.00 0.00     1  0.0000   0.0009            0 main
 56.9 0.00 0.00  0.00 0.00  0.00 0.00     1  0.0005   0.0005            0 apd_set_pprof_trace
 28.0 0.00 0.00  0.00 0.00  0.00 0.00    10  0.0000   0.0000            0 preg_replace
 14.3 0.00 0.00  0.00 0.00  0.00 0.00    10  0.0000   0.0000            0 str_replace

    Warning: the latest release of APD is dated 2004. The extension is no longer maintained and has various compatibility issues (see comments).