xhprof-sample-profiling.md

1. Add to index.php

<?php

xhprof_sample_enable();
register_shutdown_function(function () {
  $namespace = "somename";
  $filename = '/tmp/' . uniqid() . '.' . $namespace . '.sample_xhprof';
  file_put_contents($filename, serialize(xhprof_sample_disable()));
  chmod($filename, 0777);
});

2. Make a bunch of requests
3. Move sample files into a directory

mkdir some-dir
mv /tmp/*.sample_xhprof some-dir/

4. Get flamegraph scripts

git clone https://github.com/brendangregg/FlameGraph.git
git clone https://github.com/msonnabaum/xhprof-flamegraphs.git

5. Create flamegraph from sample files

xhprof-flamegraphs/xhprof-sample-to-flamegraph-stacks test-samples | FlameGraph/flamegraph.pl > result.svg
open result.svg