🦀 Rust PiCalculator on Orange Pi RV2 (riscv64, Armbian Trixie)
Compiled and ran a high-precision Pi calculator in Rust on my Orange Pi RV2 (K1X, 8-core @ 1.6 GHz) running Armbian-unofficial Trixie riscv64. The goal: test rustc performance and validate big-integer workloads on RISC-V.
✅ Environment
OS: Armbian-unofficial 26.02.0-trunk (Debian Trixie)
Kernel: Linux 6.18.5-edge-spacemit
Rust: rustc 1.85.0, cargo 1.85.0 (built from source)
Display: EZCAP28X @ 1920×1080
Memory: 3.7 GiB RAM, 1.3 GiB used
Disk: ext4, 28.96 GiB total
GPU: Mesa llvmpipe (LLVM 19.1.7)
🧮 Project: PiCalculator
Rust implementation using rug (GMP-backed) to compute 1000 digits of π:
rust
use rug::{float::Constant, Float}; fn main() { let digits: usize = 1000; let bits: u32 = ((digits as f64) * 3.321928).ceil() as u32 + 10; let pi = Float::with_val(bits, Constant::Pi); let s = pi.to_string_radix(10, Some(digits)); println!("{s}"); }
🧩 Build Notes
Needed libgmp-dev and m4 to compile rug cleanly.
cargo build --release succeeded without patching.
Output verified against known π digits.
⚖️ Performance Comparison
Board CPU Time (ms) Real Time (ms) Pi 400 Faster (1.8 GHz, fewer cores) Lower latency RV2 (K1X) Slower per-core, but stable Good throughput
Despite having 8 cores, the RV2’s in-order K1X is slower than the Pi 400’s Cortex-A72 for single-threaded math. Still, the build was smooth and the output correct — a great stress test for rustc on riscv64.
