Need to ctrl-c to writte the file

[wiiznokes]

Not sure why, but i have to ctrl-c the program to see the output:

^Cwriting flamegraph to "flamegraph.svg"

[djc]

flamegraph is a pretty small wrapper around perf (on Linux) and other tools. I'm guessing this might be an issue too when you run perf directly, and is unrelated to flamegraph itself.

[PedroHLC]

This is the same issue as #337 (comment) -- the same workaround works.