Programming Language and compiler
Benchmarks

C++ VS Crystal benchmarks

Current benchmark data was generated on Mon Mar 31 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 1.4ms 2.6MB 1530ms 0ms g++ 11.4.0
cpp 1-im.cpp 401ms 9.4ms 3.9MB 1550ms 0ms clang++ 14.0.0-1ubuntu1.1
crystal 1.cr 2498ms 12ms 2.8MB 2487ms 0ms crystal 1.15.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 1-im.cpp 41ms 1.0ms 3.9MB 130ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1-im.cpp 43ms 4.4ms 2.4MB 137ms 0ms g++ 11.4.0
crystal 1.cr 206ms 0.7ms 2.9MB 200ms 0ms crystal 1.15.1

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 1.cpp 1.1ms 0.1ms 1.4MB 0ms 0ms g++ 11.4.0
cpp 1.cpp 1.4ms 0.1ms 2.3MB 0ms 0ms clang++ 14.0.0-1ubuntu1.1
crystal 1.cr 1.9ms 0.1ms 2.9MB 0ms 0ms crystal 1.15.1

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 0-i.cpp 167ms 0.5ms 1.5MB 160ms 0ms g++ 11.4.0
cpp 0-i.cpp 171ms 0.4ms 2.3MB 160ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1.cpp 314ms 0.9ms 1.8MB 307ms 0ms g++ 11.4.0
cpp 1.cpp 316ms 1.6ms 2.3MB 310ms 0ms clang++ 14.0.0-1ubuntu1.1
crystal 1.cr 344ms 1.7ms 3.1MB 333ms 0ms crystal 1.15.1
crystal 2.cr 345ms 2.2ms 3.1MB 337ms 0ms crystal 1.15.1

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 0-i.cpp 19ms 0.1ms 1.5MB 10ms 0ms g++ 11.4.0
cpp 0-i.cpp 19ms 0.0ms 2.3MB 10ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1.cpp 34ms 0.5ms 2.3MB 27ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 1.cpp 34ms 0.9ms 1.8MB 30ms 0ms g++ 11.4.0
crystal 2.cr 38ms 0.8ms 3.1MB 30ms 0ms crystal 1.15.1
crystal 1.cr 39ms 1.3ms 3.1MB 30ms 0ms crystal 1.15.1

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 298ms 0.7ms 8.1MB 290ms 0ms crystal 1.15.1
crystal 1.cr 416ms 4.8ms 42.3MB 403ms 0ms crystal 1.15.1
cpp 1.cpp 481ms 2.1ms 7.3MB 470ms 0ms g++ 11.4.0
cpp 1.cpp 527ms 0.7ms 7.7MB 517ms 0ms clang++ 14.0.0-1ubuntu1.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 77ms 1.4ms 4.4MB 70ms 0ms crystal 1.15.1
crystal 1.cr 89ms 2.5ms 13.0MB 80ms 0ms crystal 1.15.1
cpp 1.cpp 119ms 0.6ms 3.6MB 110ms 0ms g++ 11.4.0
cpp 1.cpp 131ms 0.7ms 4.1MB 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 469ms 0.5ms 3.5MB 1817ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 8-m.cpp 492ms 15ms 2.1MB 1897ms 0ms g++ 11.4.0
cpp 6-im.cpp 921ms 2.1ms 3.4MB 3610ms 3ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 922ms 0.6ms 2.1MB 3630ms 0ms g++ 11.4.0
crystal 1.cr 3779ms 15ms 4.4MB 3773ms 0ms crystal 1.15.1

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 8-m.cpp 125ms 0.9ms 3.4MB 453ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 8-m.cpp 129ms 1.9ms 2.0MB 483ms 0ms g++ 11.4.0
cpp 6-im.cpp 240ms 2.2ms 2.0MB 923ms 0ms g++ 11.4.0
cpp 6-im.cpp 244ms 7.1ms 3.4MB 920ms 0ms clang++ 14.0.0-1ubuntu1.1
crystal 1.cr 952ms 5.3ms 4.3MB 943ms 0ms crystal 1.15.1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
cpp 8-m.cpp 40ms 0.9ms 2.0MB 130ms 0ms g++ 11.4.0
cpp 8-m.cpp 41ms 5.0ms 3.4MB 117ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 66ms 0.6ms 3.4MB 227ms 0ms clang++ 14.0.0-1ubuntu1.1
cpp 6-im.cpp 68ms 1.1ms 2.0MB 243ms 0ms g++ 11.4.0
crystal 1.cr 246ms 0.8ms 3.8MB 237ms 0ms crystal 1.15.1