Metabolism: region pool — SharedArrayBuffer arena, band-parallel phases (block sums / VM decisions / advection+reaction), bit-identical to serial; 5.9x at 41k organisms; provider protocol sketched

2026-10-28 15:25:52 +01:00
parent 3a72525ccb
commit d6e97a2b52
5 changed files with 685 additions and 268 deletions
@@ -96,6 +96,25 @@ test('genesis pre-simulates generations so frame 0 is already an ecosystem', ()
    assert.equal(withGenesis.world.frame, -1, 'the film starts at frame 0');
 });

+test('the region pool is exact: parallel == serial, bit for bit', () => {
+    const grow = (workers) => {
+        const song = load('drone');
+        const run = new Run(song, { fps: 30, seed: 12345, width: 240, height: 135, field: 64, genesis: 0, workers });
+        for (let f = 0; f < 150; f++) { run.world.step(); run.camera.update(f); }
+        const history = Array.from(run.world.history.alive.slice(0, 150));
+        const trail = Array.from(run.world.trail[0].slice(0, 4000));
+        run.world.dispose?.();
+        return { history, trail };
+    };
+    const serial = grow(0);
+    const two = grow(2);
+    const four = grow(4);
+    const eq = (a, b) => a.history.every((v, i) => v === b.history[i]) &&
+        a.trail.every((v, i) => v === b.trail[i]);
+    assert.ok(eq(serial, two), '2 regions must match the serial world exactly');
+    assert.ok(eq(serial, four), '4 regions must match the serial world exactly');
+});
+
 test('genesis is deterministic and song-scaled', () => {
    const a = new Run(load('drone'), { fps: 30, seed: 12345, width: 240, height: 135, field: 64 });
    const b = new Run(load('drone'), { fps: 30, seed: 12345, width: 240, height: 135, field: 64 });