CoreCrunch

A comprehensive CPU benchmark tool written in Rust that tests low-level CPU intrinsics, memory subsystem performance, and real-world computational workloads. Runs tests across multiple core counts to measure parallel scaling efficiency, and produces a CoreCrunch Score for easy comparison between machines.

Cross-platform: Linux (with CPU temperature monitoring) and Windows. Zero compiler warnings.

Scores

CoreCrunch produces four scores at the end of each run:

Score	What it measures
CPU Single-Core	CPU performance using 1 core (intrinsics + real-world tests)
CPU Multi-Core	CPU performance at max core count
Memory	Memory bandwidth and latency
Overall	Overall system score (geometric mean of all three)

A mid-range modern CPU scores ~1000. Higher is better.

Tests

CPU Feature Tests (Low-Level Intrinsics)

• AVX2 FP Throughput — FMA-based floating point
• AVX-512 FP Throughput — 512-bit SIMD (shows "Not Supported" if unavailable)
• AES-NI Throughput — hardware AES encryption rounds
• SHA Extensions — hardware SHA-256 rounds
• SSE4.2 CRC32 — hardware CRC32C
• AVX2 Integer SIMD — 256-bit integer multiply/add

Memory Tests

• Sequential Read Bandwidth
• Sequential Write Bandwidth
• Memory Latency (pointer-chase)

Real World Tests

• LLM Inference Simulation — matrix multiply + ReLU layers
• Gzip Compress/Decompress
• Image Blur (5x5 Gaussian kernel)
• Large Dataset Sort

Legacy Tests (v1 benchmarks, via --legacy)

• FFT (pure-Rust Cooley-Tukey)
• SHA-256 (software)
• Matrix Multiplication
• Floating Point Ops
• Monte Carlo Pi
• Prime Sieve
• N-Body Simulation

Installation

Download the latest release from the Releases page (Linux and Windows binaries available).

Or build from source:

git clone https://github.com/ddxfish/corecrunch
cd corecrunch
cargo build --release

Cross-compile for Windows from Linux:

rustup target add x86_64-pc-windows-gnu
sudo apt install mingw-w64
cargo build --release --target x86_64-pc-windows-gnu

Usage

Usage: corecrunch [OPTIONS]

Options:
  -p, --processes <PROCESSES>  Number of processes (default: CPU core count)
  -i, --intensity <INTENSITY>  Intensity level 1-10 (default: 3)
      --low-level-only         Run only CPU feature tests
      --memory-only            Run only memory tests
      --real-world-only        Run only real-world tests
      --legacy                 Include legacy v1 benchmarks
      --legacy-only            Run only legacy v1 benchmarks
      --no-temp                Disable CPU temperature monitoring
  -h, --help                   Print help
  -V, --version                Print version

Examples

# Default full run (~2 minutes)
corecrunch

# Quick test run
corecrunch -i 1

# CPU-only tests with legacy benchmarks
corecrunch --low-level-only --legacy

# Compare legacy v1 results across machines
corecrunch --legacy-only

# Heavy stress test
corecrunch -i 7

CPU Temperature

CPU temperature is monitored by default on Linux (before/after each core-count run). It reads from hwmon sensors and supports Intel coretemp, AMD k10temp/zenpower, and similar drivers. If no sensors are found, the row is silently omitted. Use --no-temp to disable.

Temperature monitoring is not available on Windows builds.

License

This project is licensed under the MIT License - see the LICENSE file for details.