Add benchmarking

.gitignore

@@ -32,8 +32,10 @@ Cargo.lock
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
 
-# Profiler output
+# Flamegraph output
 **/perf.data
+**/perf.data.old
+
 **/flamegraph.svg
 
 ## Test coverage output

bbx_dsp/src/constants.rs

@@ -4,6 +4,6 @@ use crate::context::Context;
 pub const DEFAULT_CONTEXT: Context = Context {
     sample_rate: 44100,
     num_channels: 2,
-    buffer_size: 256,
-    max_num_graph_nodes: 384,
+    buffer_size: 128,
+    max_num_graph_nodes: 1024,
 };

bbx_dsp/src/effectors/overdrive.rs

@@ -13,7 +13,7 @@ impl Process for OverdriveEffector {
         sum_audio_inputs(inputs, output);
 
         for channel_buffer in output.iter_mut() {
-            channel_buffer.apply(|s| s - (s.powi(3) / 3.0))
+            channel_buffer.apply(|s| s - (s.powi(3) / 3.0));
         }
     }
 }

bbx_dsp/src/graph.rs

@@ -226,6 +226,8 @@ impl Graph {
 
 #[cfg(test)]
 mod tests {
+    use test::Bencher;
+
     use super::*;
     use crate::{context::Context, effector::Effector, generator::Generator, generators::wave_table::Waveform};
 
@@ -323,4 +325,27 @@ mod tests {
         let result = graph.evaluate();
         assert_eq!(result.len(), 6); // Assuming 2 channels for this context
     }
+
+    #[bench]
+    fn bench_evaluate(b: &mut Bencher) {
+        let context = Context::new(44100, 2, 128, 2048);
+        let mut graph = Graph::new(context);
+
+        let mixer = graph.add_effector(Effector::Mixer);
+        for n in 0..256 {
+            let osc = graph.add_generator(Generator::WaveTable {
+                frequency: 110.0 * (n + 1) as f32,
+                waveform: Waveform::Sine,
+            });
+            graph.create_connection(osc, mixer);
+        }
+        let overdrive = graph.add_effector(Effector::Overdrive);
+        graph.create_connection(mixer, overdrive);
+
+        graph.prepare_for_playback();
+
+        b.iter(|| {
+            graph.evaluate();
+        });
+    }
 }

bbx_dsp/src/lib.rs

@@ -1,3 +1,6 @@
+#![feature(test)]
+extern crate test;
+
 pub mod effectors;
 pub mod generators;
 

bbx_sandbox/examples/03_n_osc.rs

@@ -4,9 +4,10 @@ use bbx_dsp::{
 };
 use bbx_sandbox::{player::Player, signal::Signal};
 
-const NUM_OSCILLATORS: usize = 128;
+const NUM_OSCILLATORS: usize = 6;
 
 const BASE_FREQUENCY: f32 = 55.0;
+const MAX_FREQUENCY: f32 = 999.0;
 
 fn main() {
     // Create a `Graph` with the default context
@@ -17,8 +18,9 @@ fn main() {
 
     // Create a number of oscillator nodes and connect to the mixer
     for n in 0..NUM_OSCILLATORS {
+        let frequency = (n as f32 / NUM_OSCILLATORS as f32) * MAX_FREQUENCY + BASE_FREQUENCY;
         let oscillator = graph.add_generator(Generator::WaveTable {
-            frequency: BASE_FREQUENCY * (n + 1) as f32,
+            frequency,
             waveform: Waveform::Sine,
         });
         graph.create_connection(oscillator, mixer);
@@ -29,7 +31,7 @@ fn main() {
     graph.create_connection(mixer, overdrive);
 
     // Add a filter because it sounds harsh
-    let filter = graph.add_effector(Effector::Filter(DEFAULT_CONTEXT, 1500.0, 1.5));
+    let filter = graph.add_effector(Effector::Filter(DEFAULT_CONTEXT, MAX_FREQUENCY / 2.0, 1.5));
     graph.create_connection(overdrive, filter);
 
     // Prepare the graph for playback