Profiling rav1e

Cargo integrations

There are multiple integrations with cargo that simplify your life a lot .

Flamegraph

flamegraph works in any platform that has dtrace or perf support.

$ cargo install flamegraph
$ cargo flamegraph -o flame.svg -b rav1e -- ~/sample.y4m -o /dev/null
$ $browser flame.svg

NOTE Make sure the browser lets you use the built-in interactivity in the svg.

Instruments

cargo-instruments is macOS-only and integrates neatly with the XCode UI.

$ cargo install cargo-instruments
$ cargo instruments --release --open --bin rav1e -- ~/sample.y4m -o /dev/null

Generic profiling

Perf

Most common linux-specific profiler, to use the callgraphs you need dwarf debug symbols.

$ cargo build --release
$ perf record --call-graph dwarf target/release/rav1e ~/sample.y4m -o /dev/null
$ perf report

uftrace

uftrace is an ELF-specific tracer. It leverages the mcount instrumentation.

$ cargo rustc --release --bin rav1e -- -Z instrument-mcount
$ uftrace record --no-libcall -D 5 target/release/rav1e ~/sample.y4m -o /dev/null
$ uftrace report