Think like callgrind, but without the overhead. The true x86 equivalent is probably `vtune` For open source there's `perf` + `flamegraph` but that's not inter

Think like callgrind, but without the overhead. The true x86 equivalent is probably `vtune` For open source there's `perf` + `flamegraph` but that's not interactive, or `KDAB/hotspot` which is probably the closest open-source thing to Apple Instruments.