Profiling instructions

PROFILE.md

@@ -0,0 +1,90 @@
+set -x PATH "~/local/opt/flamegraph/target/release/:$PATH"
+cargo flamegraph --bench main --root -- --bench normalize_process
+
+cargo flamegraph --package=blazesym --unit-bench --root --features=nightly -- bench_function_parsing
+(requires
+https://github.com/d-e-s-o/flamegraph/commit/9f5443b4e6699993d390059bf19f4059281bb5a7)
+
+With flamegraph patch:
+PATH="~/local/opt/flamegraph/target/release:$PATH" cargo flamegraph --verbose --profile=bench --package=blazesym --unit-test -- dwarf::resolver::tests::source_location_finding
+
+```patch
+--- cargo-flamegraph.rs
++++ cargo-flamegraph.rs
+@@ -121,7 +121,7 @@ fn build(opt: &Opt, kind: impl IntoIterator<Item = String>) -> anyhow::Result<Ve
+     }
+
+     if let Some(Some(ref unit_test)) = opt.unit_test {
+-        match kind.into_iter().any(|k| k == "lib") {
++        match kind.into_iter().any(|k| k == "lib" || k == "cdylib" || k == "rlib" || k == "staticlib") {
+             true => cmd.arg("--lib"),
+             false => cmd.args(&["--bin", unit_test]),
+         };
+@@ -182,7 +182,7 @@ fn workload(opt: &Opt, artifacts: &[Artifact]) -> anyhow::Result<Vec<String>> {
+         Opt {
+             unit_test: Some(Some(t)),
+             ..
+-        } => (&["lib", "bin"], t),
++        } => (&["lib", "cdylib", "rlib", "staticlib", "bin"], t),
+         _ => return Err(anyhow!("no target for profiling")),
+     };
+
+@@ -407,7 +407,7 @@ fn main() -> anyhow::Result<()> {
+         target.kind
+     } else if let Some(unit_test) = opt.unit_test {
+         let target = find_unique_target(
+-            &["bin", "lib"],
++            &["bin", "lib", "cdylib", "rlib", "staticlib"],
+             opt.package.as_deref(),
+             opt.manifest_path.as_deref(),
+             unit_test.as_deref(),
+```
+
+OR
+
+```patch
+--- Cargo.toml
++++ Cargo.toml
+@@ -35,7 +35,7 @@ autobenches = false
+
+ [lib]
+ name = "blazesym"
+-crate-type = ["cdylib", "rlib", "staticlib"]
++#crate-type = ["cdylib", "rlib", "staticlib"]
+
+ [features]
+ default = ["demangle", "dwarf", "lru"]
+```
+
+
+```
+--- bin/cargo-flamegraph.rs
++++ bin/cargo-flamegraph.rs
+@@ -40,7 +40,7 @@ struct Opt {
+
+     /// Benchmark to run
+     #[clap(long, group = "exec-args")]
+-    bench: Option<String>,
++    bench: Option<Option<String>>,
+
+     /// Path to Cargo.toml
+     #[clap(long)]
+@@ -115,7 +115,7 @@ fn build(opt: &Opt, kind: impl IntoIterator<Item = String>) -> anyhow::Result<Ve
+         cmd.arg(test);
+     }
+
+-    if let Some(ref bench) = opt.bench {
++    if let Some(Some(ref bench)) = opt.bench {
+         cmd.arg("--bench");
+         cmd.arg(bench);
+     }
+@@ -178,7 +178,7 @@ fn workload(opt: &Opt, artifacts: &[Artifact]) -> anyhow::Result<Vec<String>> {
+             example: Some(t), ..
+         } => (&["example"], t),
+         Opt { test: Some(t), .. } => (&["test"], t),
+-        Opt { bench: Some(t), .. } => (&["bench"], t),
++        Opt { bench: Some(Some(t)), .. } => (&["bench"], t),
+         Opt {
+             unit_test: Some(Some(t)),
+             ..
+```