Profiling

[stefnotch]

Compile times

• https://endler.dev/2020/rust-compile-times/#profile-compile-times e.g. cargo rustc -- -Zself-profile followed by https://github.com/rust-lang/measureme/blob/master/flamegraph/README.md
• cargo build --timings
• https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html was somewhat successful
• https://fasterthanli.me/articles/why-is-my-rust-build-so-slow
• https://www.reddit.com/r/rust/comments/11vrzme/comment/jcuuapx/?utm_source=share&utm_medium=web2x&context=3
• https://robert.kra.hn/posts/2022-09-09-speeding-up-incremental-rust-compilation-with-dylibs/
  • dylibs have some odd limitations and caused some compile failures for me
• miri doesn't run, because of "can't call foreign function GetCurrentThreadId on OS windows" in winit

cargo clean
set MIRIFLAGS=-Zmiri-disable-isolation
cargo miri run

• cranelift doesn't work because of this. We should report that.

warning: `animations` (lib) generated 2 warnings (run `cargo fix --lib -p animations` to apply 2 suggestions)
    Finished dev [unoptimized + debuginfo] target(s) in 0.36s
     Running `target\debug\game.exe`
error: process didn't exit successfully: `target\debug\game.exe` (exit code: 0xc000001d, STATUS_ILLEGAL_INSTRUCTION)
Illegal instruction

• Use hyperfine to benchmark different compiler settings https://benw.is/posts/how-i-improved-my-rust-compile-times-by-seventy-five-percent

Runtime

• Tracy!
• https://github.com/bevyengine/bevy/blob/main/docs/profiling.md
• https://nnethercote.github.io/perf-book/profiling.html
• https://docs.rs/crate/bevy_ecs/latest/features