Programming Language and compiler
Benchmarks

C++ VS Rust benchmarks

Current benchmark data was generated on Sun Jul 13 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 402ms 3.9ms 4.0MB 1563ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1-im.cpp 403ms 1.7ms 2.5MB 1547ms 0ms g++ 11.4.0
rust 3-im.rs 408ms 2.7ms 2.1MB 1570ms 0ms rustc 1.88.0
rust 5-m.rs 555ms 5.1ms 2.0MB 2160ms 0ms rustc 1.88.0
rust 2-im.rs 672ms 12ms 2.0MB 2567ms 0ms rustc 1.88.0
rust 1-m.rs 941ms 5.9ms 2.1MB 3617ms 0ms rustc 1.88.0
rust 3-i.rs 1506ms 1.0ms 1.9MB 1500ms 0ms rustc 1.88.0
rust 2-i.rs 2400ms 1.3ms 1.8MB 2390ms 0ms rustc 1.88.0
rust 1.rs 2723ms 24ms 1.8MB 2713ms 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 37ms 0.3ms 2.0MB 120ms 0ms rustc 1.88.0
cpp 1-im.cpp 40ms 1.4ms 2.6MB 130ms 0ms g++ 11.4.0
cpp 1-im.cpp 40ms 1.4ms 3.9MB 133ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 5-m.rs 52ms 0.9ms 2.1MB 170ms 0ms rustc 1.88.0
rust 2-im.rs 60ms 1.0ms 2.1MB 203ms 0ms rustc 1.88.0
rust 1-m.rs 81ms 1.2ms 2.1MB 290ms 0ms rustc 1.88.0
rust 3-i.rs 126ms 0.1ms 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 1.4ms 1.8MB 220ms 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 0.0ms 1.4MB 0ms 0ms g++ 11.4.0
rust 1.rs 1.2ms 0.0ms 1.8MB 0ms 0ms rustc 1.88.0
rust 1.rs 1.2ms 0.1ms 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 0.5ms 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 0.8ms 2.3MB 160ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 7-i.rs 219ms 0.6ms 1.8MB 210ms 0ms rustc 1.88.0
rust 1.rs 229ms 0.2ms 1.8MB 220ms 0ms rustc 1.88.0
rust 3.rs 279ms 0.6ms 1.9MB 270ms 0ms rustc 1.90.0-nightly
rust 2.rs 279ms 0.4ms 1.8MB 270ms 0ms rustc 1.88.0
cpp 1.cpp 314ms 1.3ms 1.8MB 307ms 0ms g++ 11.4.0
cpp 1.cpp 316ms 1.0ms 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
cpp 0-i.cpp 18ms 0.1ms 1.5MB 10ms 0ms g++ 11.4.0
rust 4-i.rs 19ms 0.1ms 1.8MB 10ms 0ms rustc 1.88.0
cpp 0-i.cpp 19ms 0.4ms 2.3MB 10ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 7-i.rs 24ms 0.3ms 1.8MB 20ms 0ms rustc 1.88.0
rust 1.rs 25ms 0.4ms 1.8MB 20ms 0ms rustc 1.88.0
rust 3.rs 30ms 0.2ms 1.8MB 20ms 0ms rustc 1.90.0-nightly
rust 2.rs 30ms 0.3ms 1.6MB 20ms 0ms rustc 1.88.0
cpp 1.cpp 34ms 0.6ms 2.3MB 30ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1.cpp 34ms 0.9ms 1.8MB 30ms 0ms g++ 11.4.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 2.rs 303ms 3.7ms 6.6MB 293ms 0ms rustc 1.88.0
rust 1.rs 377ms 18ms 40.9MB 363ms 0ms rustc 1.88.0
cpp 1.cpp 484ms 1.6ms 7.3MB 477ms 0ms g++ 11.4.0
cpp 1.cpp 528ms 2.2ms 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 68ms 4.3ms 11.6MB 57ms 0ms rustc 1.88.0
rust 2.rs 77ms 1.6ms 2.9MB 70ms 0ms rustc 1.88.0
cpp 1.cpp 119ms 1.7ms 3.6MB 110ms 0ms g++ 11.4.0
cpp 1.cpp 133ms 0.8ms 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 468ms 1.6ms 3.4MB 1820ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 8-m.cpp 482ms 0.8ms 2.1MB 1880ms 0ms g++ 11.4.0
rust 7-m.rs 493ms 0.6ms 2.1MB 1910ms 0ms rustc 1.88.0
rust 8-m.rs 494ms 0.2ms 2.5MB 1907ms 3ms rustc 1.90.0-nightly
cpp 6-im.cpp 921ms 2.0ms 2.3MB 3627ms 0ms g++ 11.4.0
cpp 6-im.cpp 924ms 12ms 3.4MB 3610ms 3ms clang++ 14.0.0-1ubuntu1.1
rust 8.rs 992ms 1.9ms 2.4MB 983ms 0ms rustc 1.90.0-nightly
rust 7.rs 1924ms 0.5ms 1.9MB 1913ms 0ms rustc 1.88.0
rust 2-m.rs 2071ms 4.3ms 2.4MB 8133ms 3ms rustc 1.88.0
rust 2.rs 4270ms 7.1ms 2.0MB 4260ms 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 123ms 0.9ms 3.6MB 460ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 7-m.rs 127ms 0.2ms 2.3MB 470ms 3ms rustc 1.88.0
rust 8-m.rs 128ms 0.3ms 2.3MB 470ms 7ms rustc 1.90.0-nightly
cpp 8-m.cpp 128ms 0.7ms 2.0MB 480ms 0ms g++ 11.4.0
cpp 6-im.cpp 238ms 0.5ms 2.1MB 913ms 0ms g++ 11.4.0
cpp 6-im.cpp 241ms 5.7ms 3.4MB 910ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 8.rs 250ms 0.4ms 2.1MB 240ms 0ms rustc 1.90.0-nightly
rust 7.rs 488ms 5.6ms 1.8MB 480ms 0ms rustc 1.88.0
rust 2-m.rs 521ms 0.5ms 2.1MB 2013ms 0ms rustc 1.88.0
rust 2.rs 1069ms 2.0ms 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 0.6ms 2.3MB 110ms 0ms rustc 1.90.0-nightly
rust 7-m.rs 36ms 0.0ms 2.1MB 113ms 0ms rustc 1.88.0
cpp 8-m.cpp 39ms 0.4ms 2.0MB 130ms 0ms g++ 11.4.0
cpp 8-m.cpp 39ms 4.7ms 3.4MB 113ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 64ms 0.4ms 3.4MB 227ms 0ms clang++ 14.0.0-1ubuntu1.1
rust 8.rs 65ms 0.6ms 1.9MB 60ms 0ms rustc 1.90.0-nightly
cpp 6-im.cpp 67ms 0.1ms 2.0MB 240ms 0ms g++ 11.4.0
rust 7.rs 127ms 1.7ms 1.8MB 120ms 0ms rustc 1.88.0
rust 2-m.rs 134ms 0.2ms 2.1MB 500ms 0ms rustc 1.88.0
rust 2.rs 270ms 1.7ms 1.9MB 260ms 0ms rustc 1.88.0