well that didn't work

Cargo.lock

@@ -372,9 +372,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.91"
+version = "0.2.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8916b1f6ca17130ec6568feccee27c156ad12037880833a3b842a823236502e7"
+checksum = "56d855069fafbb9b344c0f962150cd2c1187975cb1c22c1522c240d8c4986714"
 
 [[package]]
 name = "libm"
@@ -551,9 +551,9 @@ checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.24"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+checksum = "a152013215dca273577e18d2bf00fa862b89b24169fb78c4c95aeb07992c9cec"
 dependencies = [
  "unicode-xid",
 ]
@@ -755,9 +755,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.67"
+version = "1.0.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6498a9efc342871f91cc2d0d694c674368b4ceb40f62b65a7a08c3792935e702"
+checksum = "3ce15dd3ed8aa2f8eeac4716d6ef5ab58b6b9256db41d7e1a0224c2788e8fd87"
 dependencies = [
  "proc-macro2",
  "quote",

src/grid.rs

@@ -88,8 +88,6 @@ pub struct Grid {
     // Scratch space for the blur operation.
     buf: Vec<f32>,
     blur: Blur,
-
-    pub i: Vec<usize>,
 }
 
 impl Clone for Grid {
@@ -101,14 +99,13 @@ impl Clone for Grid {
             data: self.data.clone(),
             buf: self.buf.clone(),
             blur: self.blur.clone(),
-            i: self.i.clone(),
         }
     }
 }
 
 impl Grid {
     // Create a new grid filled with random floats in the [0.0..1.0) range.
-    pub fn new<R: Rng + ?Sized>(width: usize, height: usize, rng: &mut R, i: Vec<usize>) -> Self {
+    pub fn new<R: Rng + ?Sized>(width: usize, height: usize, rng: &mut R) -> Self {
         if !width.is_power_of_two() || !height.is_power_of_two() {
             panic!("Grid dimensions must be a power of two.");
         }
@@ -122,7 +119,6 @@ impl Grid {
             config: PopulationConfig::new(rng),
             buf: vec![0.0; width * height],
             blur: Blur::new(width),
-            i,
         }
     }
 

src/main.rs

@@ -2,22 +2,22 @@ use physarum::model;
 
 fn main() {
     // # of iterations to go through
-    let n_iterations = 256;
+    let n_iterations = 2048;
 
     // Size of grid and pictures
-    let (width, height) = (256, 256);
-    // let (width, height) = (1024, 1024);
+    // let (width, height) = (256, 256);
+    let (width, height) = (1024, 1024);
 
     // # of agents
-    // let n_particles = 1 << 20;
-    let n_particles = 1 << 16;
+    let n_particles = 1 << 26;
+    // let n_particles = 1 << 16;
     println!("n_particles: {}", n_particles);
 
     let diffusivity = 1;
 
     // `n_populations` is the # of types of agents
-    // let n_populations = 1;
-    let n_populations = 3;
+    let n_populations = 1;
+    // let n_populations = 3;
     // let n_populations = 1 + rng.gen_range(1..4); // make # of populations between 2 and 5
 
     let mut model = model::Model::new(width, height, n_particles, n_populations, diffusivity); // Create the model

src/model.rs

@@ -130,7 +130,7 @@ impl Model {
                 .map(|i| Agent::new(width, height, i / particles_per_grid, &mut rng, i))
                 .collect(),
             grids: (0..n_populations)
-                .map(|_| Grid::new(width, height, &mut rng, vec![]))
+                .map(|_| Grid::new(width, height, &mut rng))
                 .collect(),
             attraction_table,
             diffusivity,
@@ -157,23 +157,6 @@ impl Model {
         let mut time_per_agent_list: Vec<f64> = Vec::new();
         let mut time_per_step_list: Vec<f64> = Vec::new();
 
-
-        println!("Doing some population stuff...");
-        let time_1 = Instant::now();
-        let mut i_pop: Vec<Vec<usize>> = Vec::new();
-        for _i in 0..(self.grids.len()) {
-            i_pop.push(vec![]);
-        }
-        for agent in self.agents.iter() {
-            i_pop[agent.population_id].push(agent.i);
-        }
-        
-        for i in 0..(self.grids.len()) {
-            self.grids[i].i = i_pop[i].clone();
-        }        
-        println!("Took {}ms", time_1.elapsed().as_millis());
-
-        let use_exp_deposit: bool = true;
         for i in 0..steps {
             if debug {
                 println!("Starting tick for all agents...")
@@ -241,18 +224,8 @@ impl Model {
             });
 
             // Deposit
-            if use_exp_deposit {
-                let agent_list = self.agents.clone();
-                self.grids.par_iter_mut().for_each(|grid|{
-                    for i in 0..grid.i.len() {
-                        let agent = &agent_list[i];
-                        grid.deposit(agent.x, agent.y);
-                    }
-                });
-            } else {
-                for agent in self.agents.iter() {
-                    self.grids[agent.population_id].deposit(agent.x, agent.y);
-                }
+            for agent in self.agents.iter() {
+                self.grids[agent.population_id].deposit(agent.x, agent.y);
             }
 
             // Diffuse + Decay