Welcome to the causal profile viewer. To make use of this profile viewer you'll first need a causal profile. You will need to use the coz program to collect a causal profile from your program. For this to work, you will need to add at least one progress point to your program, and then build it with debug information. Next, run your program with coz:
$ coz run --- ./myprogram arg1 arg2
Next, you will need to load your profile into this viewer. Click the Load Profile button on this page and browse to your file. There are some sample profiles available as well if you want to see what a causal profile looks like.