Evan McEwen EvanMcEwen

Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

	<?php

	$categories = get_the_category();

	// Assemble a tree of category relationships
	// Also re-key the category array for easier
	// reference
	$category_tree = array();
	$keyed_categories = array();