add profiler & flamegraph at benches

benches/README.md

@@ -1,5 +1,10 @@
 # benchmarks
+*Note: we're starting to benchmark & profile Sonobe, current results are pre-optimizations.*
+
+- Benchmark
+    - Run: `cargo bench`
+    - To run a specific benchmark, for example Nova's benchmark, run: `cargo bench --bench=nova`
+- Profiling
+    - eg. `cargo bench --bench=nova -- --profile-time 3`
 
-Run: `cargo bench`
 
-To run a specific benchmark, for example Nova benchmark, run: `cargo bench --bench=nova`

benches/nova.rs

@@ -1,4 +1,8 @@
 use criterion::*;
+use pprof::{
+    criterion::{Output, PProfProfiler},
+    flamegraph::Options,
+};
 
 use ark_bn254::{constraints::GVar as bn_GVar, Fr as bn_Fr, G1Projective as bn_G};
 use ark_grumpkin::{constraints::GVar as grumpkin_GVar, Projective as grumpkin_G};
@@ -70,5 +74,9 @@ fn bench_nova_ivc(c: &mut Criterion) {
     }
 }
 
-criterion_group!(benches, bench_nova_ivc);
+criterion_group! {
+    name = benches;
+    config = Criterion::default().with_profiler(PProfProfiler::new(100, Output::Flamegraph(None)));
+    targets = bench_nova_ivc
+}
 criterion_main!(benches);