Benchmark results

All 8 implementations have so far been benchmarked on three different Intel CPUs. You can find the benchmark program on GitHub.

Benchmark parameters

• All benchmarks use an input array containing 6000 * 6000 = 36M elements, allocated and initialized before the benchmark timing starts, and destroyed after the timing has ended.
• All elements of the input array are single precision floating point numbers drawn uniformly at random from [0, 1.0).
• Before compiling the single-threaded benchmark programs, all parallel libraries were explicitly disabled using compile time switches.
• When benchmarking in parallel, the parallel libraries were instructed to use 4 software threads and the benchmark process was bound with taskset to 4 physical cores.

Benchmark 1: Intel Xeon E3-1230 v5

• Mid-range server/workstation CPU with 4 physical cores and 8 hardware threads (hyper-threading).
• Maximum clock speed 3.8 GHz.
• Intel specifications.
• Wikichip.

Compiler versions

• C++ (GCC): g++ 7.4.0-1ubuntu1
• C++ (Clang): clang 6.0.0-1ubuntu2
• Rust: rustc 1.38.0-nightly

Benchmark 2: Intel i5-4690k

• Mid-range desktop CPU with 4 physical cores and 4 hardware threads (no hyper-threading).
• Overclocked to 4.3 GHz.
• Intel specifications.

Compiler versions

• C++ (GCC): g++ 9.1.0
• C++ (Clang): clang 8.0.1
• Rust: rustc 1.38.0-nightly

Benchmark 3: Intel i5-8250U

• Mid-range laptop CPU with 4 physical cores and 8 hardware threads.
• Maximum clock speed 3.4 GHz.
• Intel specifications.

Compiler versions

• C++ (GCC): g++ 9.1.0
• C++ (Clang): clang 8.0.1
• Rust: rustc 1.38.0-nightly