Hack to turn the profiling output into the format suitable for FlameGraph.

Haddock copy:

(Click it, it's “interactive”.)

TL;DR (and the only one available) guide:

some-program +RTS -P
wget https://github.com/brendangregg/FlameGraph/raw/master/flamegraph.pl
chmod +x flamegraph.pl
flamingra some-program.prof | ./flamegraph.pl picturesque.svg

Usage:

flamingra out.prof | …

or

… | flamingra | …

where out.prof is @-P@ profiling output.