Most benchmarks test one thing at a time. ChronosBench doesn't.

Six CPU workers run concurrently across all cores — BLAS matmul, FFT, Mandelbrot, einsum folds, a prime sieve, and an entropy mill hitting the AES-NI path. They share a memory-mapped page and XOR collision hashes into it after every op, forcing real cache coherency traffic between cores.

GPU runs via PyTorch MPS on Metal. I/O phase writes random bytes — not zeros — so NVMe controllers can't compress their way to fake throughput numbers.

Three phases: CPU stress, I/O stress, mixed thermal sweep where everything runs simultaneously. Live utilization bars in the terminal. JSON report when it's done. Scriptable, no GUI, runs in CI.

Built because every other option either skipped the GPU, needed a GUI, or couldn't be automated.