Programming Language and compiler
Benchmarks

C++ VS Java 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
java 1-m.java 901ms 6.8ms 97.1MB 3320ms 40ms graal/jvm 17.0.8
java 1-m.java 983ms 3.0ms 48.4MB 3663ms 17ms openjdk 21
java 1-m.java 987ms 5.3ms 50.2MB 3643ms 20ms openjdk 23
java 1-m.java 1036ms 2.8ms 45.8MB 3383ms 143ms openjdk/zgc 21

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
java 1-m.java 183ms 8.1ms 48.2MB 497ms 20ms openjdk 21
java 1-m.java 188ms 2.5ms 50.3MB 487ms 23ms openjdk 23
java 1-m.java 205ms 0.3ms 95.9MB 573ms 40ms graal/jvm 17.0.8
java 1-m.java 299ms 1.9ms 45.9MB 493ms 137ms openjdk/zgc 21

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
cpp 1.cpp 1.3ms 0.1ms 2.3MB 0ms 0ms clang++ 14.0.0-1ubuntu1.1
java 1.java 62ms 2.2ms 52.9MB 66ms 18ms graal/jvm 17.0.8
java 1.java 67ms 7.0ms 43.8MB 74ms 18ms openjdk 21
java 1.java 71ms 5.3ms 44.7MB 74ms 16ms openjdk 23
java 1.java 193ms 7.2ms 42.8MB 82ms 136ms openjdk/zgc 21

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
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
java 1.java 442ms 1.0ms 45.1MB 480ms 17ms openjdk 21
java 1.java 444ms 3.9ms 48.3MB 480ms 23ms openjdk 23
java 1.java 454ms 0.5ms 81.1MB 490ms 30ms graal/jvm 17.0.8
java 1.java 563ms 6.0ms 44.7MB 483ms 133ms openjdk/zgc 21
java 2.java 1235ms 3.8ms 571.4MB 1363ms 87ms openjdk 21
java 2.java 1310ms 91ms 794.4MB 1433ms 93ms openjdk 23
java 2.java 3270ms 60ms 2461.0MB 1670ms 1817ms openjdk/zgc 21

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
cpp 0-i.cpp 19ms 0.4ms 2.3MB 10ms 0ms clang++ 14.0.0-1ubuntu1.1
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
java 1.java 116ms 4.0ms 45.4MB 143ms 23ms openjdk 21
java 1.java 119ms 2.3ms 81.5MB 150ms 27ms graal/jvm 17.0.8
java 1.java 120ms 2.0ms 47.9MB 157ms 13ms openjdk 23
java 1.java 240ms 5.7ms 44.7MB 153ms 140ms openjdk/zgc 21
java 2-m.java 294ms 9.4ms 366.4MB 437ms 50ms openjdk 21
java 2-m.java 317ms 4.3ms 397.4MB 450ms 67ms openjdk 23
java 2.java 674ms 5.7ms 533.2MB 460ms 400ms openjdk/zgc 21

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 390ms 0.8ms 118.4MB 430ms 23ms openjdk 23
java 1.java 391ms 5.0ms 115.1MB 447ms 23ms openjdk 21
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
java 1.java 561ms 6.7ms 112.6MB 463ms 160ms openjdk/zgc 21
java 1-m.java 626ms 57ms 271.3MB 907ms 73ms graal/jvm 17.0.8
java 2.java 779ms 2.8ms 57.2MB 837ms 23ms openjdk 21
java 2.java 783ms 1.4ms 60.2MB 830ms 20ms openjdk 23
java 2.java 853ms 0.8ms 53.3MB 780ms 147ms openjdk/zgc 21
java 2-m.java 1413ms 80ms 290.5MB 2513ms 117ms graal/jvm 17.0.8

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
java 1.java 152ms 2.2ms 64.8MB 200ms 20ms openjdk 21
java 1.java 154ms 3.8ms 68.1MB 203ms 20ms openjdk 23
java 1-m.java 212ms 3.8ms 133.8MB 293ms 47ms graal/jvm 17.0.8
java 2.java 262ms 8.9ms 50.3MB 310ms 20ms openjdk 23
java 2.java 263ms 4.7ms 49.3MB 330ms 20ms openjdk 21
java 1.java 278ms 4.5ms 61.5MB 197ms 143ms openjdk/zgc 21
java 2.java 368ms 3.9ms 47.5MB 307ms 143ms openjdk/zgc 21
java 2-m.java 483ms 1.9ms 140.6MB 857ms 63ms graal/jvm 17.0.8

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
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
java 2-m.java 1988ms 6.6ms 47.8MB 7613ms 23ms openjdk 21
java 2-m.java 1996ms 1.7ms 48.5MB 7643ms 30ms openjdk 23
java 2-m.java 2127ms 4.4ms 45.5MB 7673ms 153ms openjdk/zgc 21
java 2-m.java 2508ms 27ms 94.1MB 9400ms 37ms graal/jvm 17.0.8

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
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
java 2-m.java 602ms 2.3ms 47.5MB 2150ms 17ms openjdk 21
java 2-m.java 612ms 9.6ms 48.6MB 2137ms 20ms openjdk 23
java 2-m.java 737ms 8.8ms 45.3MB 2157ms 143ms openjdk/zgc 21
java 2-m.java 761ms 18ms 94.5MB 2673ms 37ms graal/jvm 17.0.8

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
cpp 6-im.cpp 67ms 0.1ms 2.0MB 240ms 0ms g++ 11.4.0
java 2-m.java 253ms 12ms 47.6MB 770ms 17ms openjdk 21
java 2-m.java 255ms 4.3ms 48.5MB 763ms 20ms openjdk 23
java 2-m.java 328ms 5.5ms 93.3MB 1020ms 40ms graal/jvm 17.0.8
java 2-m.java 381ms 12ms 45.7MB 770ms 147ms openjdk/zgc 21