stan44/sandpypi

stan44 fd737528ba Everything has been pushed to c# no longer using python for this project. this c# version is much more stable and faster. there is a prototype chunked version as well and goals to have multithreaded as everything is still single threaded.

2026-03-10 13:53:08 -05:00

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Sand Benchmarks

This project measures both the dense reference backend and the experimental chunk backend.

Modes

dense-baseline
chunk-baseline
app-sized
snapshot-scenes

Main workloads

empty
sparse_rain
dense_pile
gas_pocket
tool_stress
app-sized sand_fill
app-sized mixed_pile
app-sized paint_stress

Metrics

average Step time
average BuildRgbaFrame time
app-sized FPS-equivalent comparison numbers
chunk workload counters (loaded, active, stepped, dirty, field_cells)
estimated storage footprint

Run

dotnet run --project Sand.Benchmarks/Sand.Benchmarks.csproj -c Release -- --mode app-sized

dotnet run --project Sand.Benchmarks/Sand.Benchmarks.csproj -c Release -- --mode snapshot-scenes

Promotion gate

sparse step speedup must be >= 25%
sparse memory reduction at 1024x1024+ must be >= 40%
dense 512x512 regression must stay within 10%
deterministic snapshots must be reviewed after 120 and 300 steps before storage promotion