Programming Language and compiler
Benchmarks

C++ VS Rust benchmarks

Current benchmark data was generated on Tue Jul 01 2025, full log can be found HERE

CONTRIBUTIONS are WELCOME!

[x86_64][4 cores] AMD EPYC 7763 64-Core Processor (Model 1)

* -m in a file name stands for multi-threading or multi-processing

* -i in a file name stands for direct intrinsics usage. (Usage of simd intrinsics via libraries is not counted)

* -ffi in a file name stands for non-stdlib FFI usage

* (You may find time < time(user) + time(sys) for some non-parallelized programs, the overhead is from GC or JIT compiler, which are allowed to take advantage of multi-cores as that's more close to real-world scenarios.)

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 1-im.cpp 395ms 6.0ms 2.5MB 1533ms 0ms g++ 11.4.0
cpp 1-im.cpp 397ms 1.4ms 4.0MB 1540ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 3-im.rs 411ms 5.2ms 2.0MB 1570ms 0ms rustc 1.88.0
rust 5-m.rs 551ms 4.1ms 2.0MB 2133ms 0ms rustc 1.88.0
rust 2-im.rs 672ms 14ms 2.1MB 2573ms 0ms rustc 1.88.0
rust 1-m.rs 940ms 12ms 2.0MB 3637ms 0ms rustc 1.88.0
rust 3-i.rs 1508ms 1.0ms 1.9MB 1500ms 0ms rustc 1.88.0
rust 2-i.rs 2416ms 18ms 1.8MB 2407ms 0ms rustc 1.88.0
rust 1.rs 2785ms 14ms 1.8MB 2773ms 0ms rustc 1.88.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-im.rs 38ms 0.1ms 2.0MB 120ms 0ms rustc 1.88.0
cpp 1-im.cpp 40ms 0.6ms 4.0MB 133ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1-im.cpp 41ms 1.8ms 2.6MB 137ms 0ms g++ 11.4.0
rust 5-m.rs 53ms 0.8ms 2.1MB 170ms 0ms rustc 1.88.0
rust 2-im.rs 62ms 0.1ms 2.0MB 203ms 0ms rustc 1.88.0
rust 1-m.rs 84ms 1.5ms 2.1MB 290ms 0ms rustc 1.88.0
rust 3-i.rs 126ms 0.3ms 1.9MB 120ms 0ms rustc 1.88.0
rust 2-i.rs 198ms 0.3ms 1.8MB 190ms 0ms rustc 1.88.0
rust 1.rs 229ms 3.3ms 1.8MB 223ms 0ms rustc 1.88.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 1.cpp 1.0ms 0.1ms 1.4MB 0ms 0ms g++ 11.4.0
rust 1.rs 1.2ms 0.1ms 1.8MB 0ms 0ms rustc 1.88.0
rust 1.rs 1.2ms 0.0ms 1.9MB 0ms 0ms rustc 1.90.0-nightly
cpp 1.cpp 1.3ms 0.1ms 2.3MB 0ms 0ms clang++ 14.0.0-1ubuntu1.1

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 164ms 0.2ms 1.8MB 160ms 0ms rustc 1.88.0
cpp 0-i.cpp 167ms 0.3ms 1.5MB 160ms 0ms g++ 11.4.0
cpp 0-i.cpp 171ms 0.3ms 2.3MB 160ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 7-i.rs 219ms 1.1ms 1.8MB 210ms 0ms rustc 1.88.0
rust 1.rs 229ms 0.5ms 1.8MB 220ms 0ms rustc 1.88.0
rust 3.rs 279ms 0.7ms 1.9MB 270ms 0ms rustc 1.90.0-nightly
rust 2.rs 279ms 0.5ms 1.6MB 270ms 0ms rustc 1.88.0
cpp 1.cpp 314ms 1.2ms 1.8MB 307ms 0ms g++ 11.4.0
cpp 1.cpp 315ms 0.6ms 2.3MB 310ms 0ms clang++ 14.0.0-1ubuntu1.1

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 18ms 0.1ms 1.8MB 10ms 0ms rustc 1.88.0
cpp 0-i.cpp 18ms 0.1ms 1.5MB 10ms 0ms g++ 11.4.0
cpp 0-i.cpp 19ms 0.2ms 2.3MB 10ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 7-i.rs 24ms 0.5ms 1.8MB 20ms 0ms rustc 1.88.0
rust 1.rs 25ms 0.4ms 1.8MB 20ms 0ms rustc 1.88.0
rust 2.rs 30ms 0.2ms 1.8MB 20ms 0ms rustc 1.88.0
rust 3.rs 30ms 0.1ms 1.8MB 20ms 0ms rustc 1.90.0-nightly
cpp 1.cpp 34ms 0.4ms 1.9MB 30ms 0ms g++ 11.4.0
cpp 1.cpp 34ms 0.6ms 2.3MB 30ms 0ms clang++ 14.0.0-1ubuntu1.1

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 2.rs 304ms 3.2ms 6.6MB 293ms 0ms rustc 1.88.0
rust 1.rs 327ms 7.2ms 40.9MB 313ms 0ms rustc 1.88.0
cpp 1.cpp 488ms 2.4ms 7.2MB 480ms 0ms g++ 11.4.0
cpp 1.cpp 530ms 1.9ms 7.7MB 520ms 0ms clang++ 14.0.0-1ubuntu1.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 59ms 2.3ms 11.6MB 50ms 0ms rustc 1.88.0
rust 2.rs 78ms 1.2ms 2.9MB 70ms 0ms rustc 1.88.0
cpp 1.cpp 121ms 1.6ms 3.6MB 110ms 0ms g++ 11.4.0
cpp 1.cpp 133ms 0.4ms 4.0MB 120ms 0ms clang++ 14.0.0-1ubuntu1.1

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 8-m.cpp 467ms 0.8ms 3.4MB 1817ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 8-m.cpp 482ms 0.4ms 2.1MB 1880ms 0ms g++ 11.4.0
rust 8-m.rs 493ms 0.8ms 2.5MB 1907ms 3ms rustc 1.90.0-nightly
rust 7-m.rs 493ms 0.4ms 2.1MB 1910ms 0ms rustc 1.88.0
cpp 6-im.cpp 918ms 0.6ms 3.4MB 3613ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 921ms 1.9ms 2.1MB 3627ms 0ms g++ 11.4.0
rust 8.rs 994ms 2.7ms 2.4MB 983ms 0ms rustc 1.90.0-nightly
rust 7.rs 1927ms 5.1ms 1.9MB 1917ms 0ms rustc 1.88.0
rust 2-m.rs 2073ms 4.7ms 2.4MB 8130ms 10ms rustc 1.88.0
rust 2.rs 4274ms 5.2ms 2.0MB 4267ms 0ms rustc 1.88.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 8-m.cpp 125ms 2.9ms 3.4MB 463ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 8-m.rs 127ms 0.4ms 2.3MB 467ms 3ms rustc 1.90.0-nightly
rust 7-m.rs 128ms 0.8ms 2.3MB 467ms 0ms rustc 1.88.0
cpp 8-m.cpp 129ms 0.3ms 2.0MB 480ms 0ms g++ 11.4.0
cpp 6-im.cpp 240ms 2.4ms 2.0MB 913ms 0ms g++ 11.4.0
cpp 6-im.cpp 248ms 20ms 3.4MB 927ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 8.rs 251ms 0.7ms 2.1MB 240ms 0ms rustc 1.90.0-nightly
rust 7.rs 491ms 1.9ms 1.8MB 480ms 0ms rustc 1.88.0
rust 2-m.rs 521ms 0.5ms 2.1MB 2023ms 3ms rustc 1.88.0
rust 2.rs 1070ms 2.2ms 1.9MB 1060ms 0ms rustc 1.88.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 36ms 0.4ms 2.1MB 110ms 3ms rustc 1.90.0-nightly
rust 7-m.rs 36ms 0.4ms 2.0MB 110ms 0ms rustc 1.88.0
cpp 8-m.cpp 39ms 0.6ms 2.0MB 130ms 0ms g++ 11.4.0
cpp 8-m.cpp 40ms 7.9ms 3.5MB 117ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 64ms 0.4ms 3.4MB 223ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 8.rs 65ms 0.9ms 2.0MB 60ms 0ms rustc 1.90.0-nightly
cpp 6-im.cpp 69ms 3.9ms 2.3MB 247ms 0ms g++ 11.4.0
rust 7.rs 125ms 1.8ms 1.8MB 120ms 0ms rustc 1.88.0
rust 2-m.rs 134ms 0.5ms 2.1MB 497ms 0ms rustc 1.88.0
rust 2.rs 270ms 1.5ms 1.9MB 260ms 0ms rustc 1.88.0