I recently wanted to see which parts of my app were using the most memory in a PHP script. I’ve been using Xdebug and webgrind on MAMP on my local machine and loving it. Derick Rethans wrote a post a few years ago about how to use Xdebug to profile memory usage and it was fairly easy to get it working.
1. Setup Xdebug on your Mac on MAMP.
2. Set Xdebug to output the needed function traces by adding the following to the php5.3.6.ini file:
xdebug.show_mem_delta = 1
xdebug.trace_format = 1
xdebug.trace_enable_trigger = 1
xdebug.auto_trace = 1
xdebug.trace_output_dir = "/tmp" |
How to edit php .ini file in MAMP:
In context screenshot:
3. Restart MAMP
4. Download Derick’s parsing script to parse out memory usage from .xt trace files. I downloaded the script to my home directory to keep it simple.
5. Run PHP script that you want to measure memory usage from and confirm that .xt trace file is output to the /tmp directory. My output file was named
6. Run Derick’s memory parsing script against output .xt file
~/memory.php /tmp/trace.2043925204.xt memory-own 20 |
Example output:
parsing...
Done.
Showing the 20 most costly calls sorted by 'memory-own'.
Inclusive Own
function #calls time memory time memory
-----------------------------------------------------------------
{main} 1 0.0345 2303008 0.0085 1894608
EpiRoute->addRoute 107 0.0058 97344 0.0034 92208
EpiApi->addRoute 61 0.0014 49304 0.0014 49304
EpiRoute->get 64 0.0050 65280 0.0017 6608
include_once 8 0.0003 6376 0.0002 6120
Epi::getSetting 108 0.0024 5184 0.0024 5184
dbConnection 2 0.0007 4760 0.0001 4568
EpiApi->get 33 0.0062 63112 0.0014 4224
EpiRoute->post 43 0.0037 42736 0.0012 4064
EpiApi->post 28 0.0058 54088 0.0013 3584
getApi 61 0.0011 3344 0.0011 3344
mysqli->prepare 2 0.0003 2640 0.0003 2640
require 4 0.0003 2312 0.0002 2312
session_start 1 0.0001 2216 0.0001 2216
include 5 0.0006 3192 0.0003 880
fsockopen 2 0.0015 880 0.0015 880
func_get_args 2 0.0000 840 0.0000 840
EpiTemplate->display 1 0.0008 4288 0.0002 776
EpiRoute::getInstance 108 0.0022 528 0.0022 528
EpiRoute->getRoute 1 0.0002 728 0.0001 480 |
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