Days

Installation

Build Days from source and enable optional protocol features.

Prerequisites

  • Rust toolchain (stable) with Cargo.
  • Optional: cargo-nextest for faster test runs.

Build

cargo build

Run from source

The days CLI expects exactly one argument: the path to a TOML configuration file.

RUST_LOG=info cargo run -- configs/simple.toml

Feature flags

Days uses Cargo features to keep the default build lean.

  • l2: enables the layer-2 module boundary (src/l2/)
  • l2_pfc: enables PFC components (implies l2)
  • dcqcn: enables the DCQCN flow type and related code
  • lean: enables additional per-transition protocol trace logging used by LeanGuard
  • test: enables extra assertions and test-only helpers

Examples:

# Build with PFC support available (still opt-in at runtime via config)
cargo build --features l2,l2_pfc

# Run a PFC-configured experiment
RUST_LOG=info cargo run --features l2,l2_pfc -- configs/pfc.toml

# Run DCQCN (typically paired with PFC in lossless fabrics)
RUST_LOG=info cargo run --features dcqcn,l2_pfc -- configs/dcqcn_simple.toml

# Emit dcqcn_events.csv for LeanGuard (conformance checking)
RUST_LOG=info cargo run --features dcqcn,lean,l2_pfc -- configs/dcqcn_simple.toml

Days

A performant discrete-event network simulator in Rust.

Quickstart

Run built-in configs, inspect outputs, and debug simulations.

On this page

PrerequisitesBuildRun from sourceFeature flags