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Profiling the Pixwel API

The current Docker image ships the Excimer sampling profiler (installed in docker/app/Dockerfile), not XHProf.
The instructions below are the legacy XHProf flow from the Vagrant/demo-node era, kept for historical reference. They no longer apply to the Docker setup.
XHPROF was installed automatically on demo and vagrant nodes. You’d SSH into the machine, edit /opt/pixwel/pixwel-api/webroot/index.php and uncomment (or add) the line: 
$xhprof = extension_loaded('xhprof');
Then check port 82 of your demo branch (e.g. http://optimise-startup.demo.pixwel.com:82/).
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