Programming Language and compiler
Benchmarks

Nim VS Python 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.)

binarytrees

Input: 18

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 819ms 29ms 34.4MB 800ms 0ms nim 2.2.4
nim 2.nim 968ms 6.2ms 35.2MB 950ms 3ms nim/clang 2.2.4
python 1.py 1158ms 1.0ms 96.1MB 1093ms 53ms pypy 3.10.16
python 1.py timeout 0.0ms 41.0MB 4963ms 17ms cpython 3.13.5
python 1.py timeout 0.0ms 40.5MB 4753ms 233ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 77ms 2.5ms 5.5MB 70ms 0ms nim 2.2.4
nim 2.nim 93ms 2.5ms 5.8MB 80ms 0ms nim/clang 2.2.4
python 1.py 93ms 0.2ms 68.8MB 67ms 17ms pypy 3.10.16
python 1.py 477ms 1.2ms 11.9MB 453ms 13ms pyston 3.8.12
python 1.py 718ms 3.5ms 13.0MB 707ms 0ms cpython 3.13.5

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 1210ms 16ms 106.4MB 1167ms 30ms pypy 3.10.16
python 1.py 2689ms 24ms 25.4MB 2667ms 10ms cpython 3.13.5
nim 1.nim timeout 0.0ms 572.1MB 2667ms 1857ms nim 2.2.4
nim 1.nim timeout 0.0ms 574.6MB 2610ms 1913ms nim/clang 2.2.4
python 1.py timeout 0.0ms 17.4MB 4980ms 7ms pyston 3.8.12

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 220ms 5.3ms 84.7MB 183ms 27ms pypy 3.10.16
python 1.py 237ms 8.3ms 20.6MB 217ms 3ms cpython 3.13.5
python 1.py 648ms 13ms 16.8MB 633ms 0ms pyston 3.8.12
nim 1.nim 4108ms 3.9ms 518.6MB 2127ms 1553ms nim/clang 2.2.4
nim 1.nim 4147ms 34ms 519.4MB 2150ms 1567ms nim 2.2.4

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 189ms 1.3ms 1.5MB 180ms 0ms nim 2.2.4
nim 2.nim 242ms 1.4ms 1.8MB 230ms 0ms nim/clang 2.2.4
nim 1.nim 539ms 0.9ms 1.8MB 447ms 80ms nim/clang 2.2.4
nim 1.nim 562ms 2.0ms 1.5MB 467ms 77ms nim 2.2.4
python 1.py 1857ms 11ms 88.9MB 1810ms 30ms pypy 3.10.16
python 5-m.py 2292ms 35ms 65.6MB 3537ms 850ms pypy 3.10.16
python 5-m.py 2462ms 20ms 12.5MB 3543ms 983ms pyston 3.8.12
python 1.py 3024ms 23ms 8.1MB 3007ms 0ms pyston 3.8.12
python 5-m.py 3410ms 32ms 13.8MB 4480ms 947ms cpython 3.13.5
python 1.py 4667ms 43ms 9.0MB 4653ms 0ms cpython 3.13.5

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 21ms 1.0ms 1.5MB 10ms 0ms nim 2.2.4
nim 2.nim 26ms 0.3ms 1.6MB 20ms 0ms nim/clang 2.2.4
nim 1.nim 56ms 0.7ms 1.9MB 40ms 7ms nim/clang 2.2.4
nim 1.nim 58ms 0.5ms 1.5MB 43ms 0ms nim 2.2.4
python 1.py 250ms 0.9ms 63.4MB 220ms 10ms pypy 3.10.16
python 5-m.py 315ms 11ms 12.5MB 390ms 157ms pyston 3.8.12
python 1.py 315ms 4.7ms 8.1MB 303ms 0ms pyston 3.8.12
python 5-m.py 407ms 7.3ms 13.8MB 483ms 143ms cpython 3.13.5
python 5-m.py 446ms 3.8ms 65.6MB 753ms 297ms pypy 3.10.16
python 1.py 484ms 2.4ms 9.0MB 470ms 0ms cpython 3.13.5

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1.0ms 0.0ms 1.5MB 0ms 0ms nim 2.2.4
nim 1.nim 1.1ms 0.0ms 1.8MB 0ms 0ms nim/clang 2.2.4
python 1.py 12ms 0.7ms 7.6MB 10ms 0ms pyston 3.8.12
python 1.py 15ms 1.2ms 8.8MB 10ms 0ms cpython 3.13.5
python 1.py 30ms 0.9ms 51.7MB 6ms 12ms pypy 3.10.16

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 111ms 2.3ms 1.9MB 103ms 0ms nim/clang 2.2.4
nim 2.nim 114ms 1.1ms 1.6MB 110ms 0ms nim 2.2.4
python 2.py 147ms 1.1ms 58.3MB 120ms 10ms pypy 3.10.16
python 1.py 178ms 1.7ms 59.4MB 153ms 10ms pypy 3.10.16
python 1.py 730ms 8.0ms 8.9MB 720ms 0ms pyston 3.8.12
python 2.py 850ms 11ms 8.5MB 840ms 0ms pyston 3.8.12
python 1.py 1141ms 7.1ms 9.5MB 1133ms 0ms cpython 3.13.5
python 2.py 1304ms 8.0ms 9.3MB 1290ms 0ms cpython 3.13.5
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 326ms 1.8ms 1.6MB 317ms 0ms nim/clang 2.2.4
nim 2.nim 335ms 2.3ms 1.6MB 327ms 0ms nim 2.2.4
python 2.py 339ms 1.2ms 60.5MB 317ms 10ms pypy 3.10.16
python 1.py 380ms 4.2ms 60.3MB 357ms 10ms pypy 3.10.16
python 1.py 2148ms 10ms 8.9MB 2137ms 0ms pyston 3.8.12
python 2.py 2496ms 44ms 8.5MB 2483ms 0ms pyston 3.8.12
python 1.py 3362ms 46ms 9.5MB 3350ms 0ms cpython 3.13.5
python 2.py 3908ms 18ms 9.3MB 3897ms 0ms cpython 3.13.5
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 49ms 0.7ms 1.5MB 40ms 0ms nim/clang 2.2.4
nim 2.nim 51ms 2.1ms 1.5MB 43ms 0ms nim 2.2.4
python 2.py 107ms 3.6ms 58.2MB 80ms 10ms pypy 3.10.16
python 1.py 122ms 3.9ms 58.8MB 97ms 10ms pypy 3.10.16
python 1.py 355ms 5.9ms 8.5MB 343ms 0ms pyston 3.8.12
python 2.py 385ms 2.9ms 8.1MB 373ms 0ms pyston 3.8.12
nim 1.nim 477ms 2.9ms 1.3MB 470ms 0ms nim 2.2.4
nim 1.nim 486ms 13ms 1.5MB 477ms 0ms nim/clang 2.2.4
python 1.py 537ms 11ms 9.3MB 527ms 0ms cpython 3.13.5
python 2.py 628ms 9.6ms 8.9MB 617ms 0ms cpython 3.13.5

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 387ms 1.2ms 4.8MB 380ms 0ms nim/clang 2.2.4
nim 1.nim 578ms 3.9ms 4.5MB 567ms 0ms nim 2.2.4

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 19ms 0.4ms 1.9MB 10ms 0ms nim/clang 2.2.4
nim 1.nim 26ms 0.6ms 1.6MB 20ms 0ms nim 2.2.4

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 550ms 7.5ms 34.9MB 533ms 7ms nim 2.2.4
nim 1.nim 626ms 13ms 35.2MB 607ms 3ms nim/clang 2.2.4
python 1.py 2196ms 9.7ms 202.5MB 2077ms 100ms pypy 3.10.16
python 1.py timeout 0.0ms 94.1MB 4960ms 27ms cpython 3.13.5
python 1.py timeout 0.0ms 130.3MB 4930ms 57ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 117ms 1.4ms 9.6MB 107ms 0ms nim 2.2.4
nim 1.nim 133ms 1.2ms 9.9MB 120ms 0ms nim/clang 2.2.4
python 1.py 385ms 4.5ms 104.7MB 323ms 50ms pypy 3.10.16
python 1.py 3347ms 32ms 37.4MB 3317ms 13ms cpython 3.13.5
python 1.py timeout 0.0ms 48.9MB 4953ms 37ms pyston 3.8.12

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 319ms 1.6ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 341ms 1.3ms 2.0MB 330ms 0ms nim/clang 2.2.4
python 2.py 1358ms 8.1ms 58.1MB 1333ms 10ms pypy 3.10.16
python 1.py 2644ms 7.4ms 57.0MB 2620ms 10ms pypy 3.10.16
python 1.py timeout 0.0ms 8.9MB 4990ms 0ms cpython 3.13.5
python 2.py timeout 0.0ms 9.0MB 4990ms 0ms cpython 3.13.5
python 1.py timeout 0.0ms 8.3MB 4990ms 0ms pyston 3.8.12
python 2.py timeout 0.0ms 8.1MB 4990ms 0ms pyston 3.8.12

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 35ms 0.5ms 1.8MB 30ms 0ms nim 2.2.4
nim 2.nim 37ms 0.7ms 2.0MB 30ms 0ms nim/clang 2.2.4
python 2.py 182ms 1.2ms 57.9MB 160ms 10ms pypy 3.10.16
python 1.py 304ms 1.2ms 57.1MB 280ms 10ms pypy 3.10.16
python 1.py 921ms 6.9ms 8.4MB 910ms 0ms pyston 3.8.12
python 2.py 1314ms 5.3ms 8.3MB 1300ms 0ms pyston 3.8.12
python 2.py 2943ms 21ms 9.0MB 2930ms 0ms cpython 3.13.5
python 1.py 3003ms 91ms 9.0MB 2990ms 0ms cpython 3.13.5

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 281ms 9.2ms 41.5MB 270ms 0ms nim 2.2.4
nim 1.nim 314ms 3.5ms 41.8MB 303ms 0ms nim/clang 2.2.4
python 1.py 2563ms 130ms 369.7MB 2490ms 57ms pypy 3.10.16
python 2.py 2996ms 31ms 632.9MB 2817ms 167ms pyston 3.8.12
python 1.py 4717ms 60ms 320.4MB 4660ms 40ms pyston 3.8.12
python 1.py timeout 0.0ms 321.4MB 4967ms 23ms cpython 3.13.5
python 2.py timeout 0.0ms 633.8MB 4823ms 157ms cpython 3.13.5
python 2.py timeout 0.0ms 959.9MB 4717ms 263ms pypy 3.10.16

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 51ms 1.7ms 11.5MB 40ms 0ms nim 2.2.4
nim 1.nim 64ms 3.6ms 11.8MB 53ms 0ms nim/clang 2.2.4
python 1.py 547ms 6.2ms 135.3MB 507ms 23ms pypy 3.10.16
python 2.py 723ms 2.9ms 164.2MB 683ms 27ms pyston 3.8.12
python 1.py 1065ms 10ms 86.0MB 1040ms 10ms pyston 3.8.12
python 2.py 1383ms 0.6ms 165.1MB 1343ms 27ms cpython 3.13.5
python 2.py 1508ms 4.4ms 290.3MB 1420ms 73ms pypy 3.10.16
python 1.py 2870ms 13ms 87.0MB 2847ms 10ms cpython 3.13.5

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1641ms 6.1ms 151.9MB 1607ms 20ms nim/clang 2.2.4
nim 1.nim 1674ms 9.9ms 152.1MB 1640ms 20ms nim 2.2.4
python 1.py 2263ms 15ms 243.6MB 2203ms 47ms pypy 3.10.16
python 1.py 4758ms 1.8ms 252.5MB 4570ms 170ms pyston 3.8.12
python 1.py timeout 0.0ms 130.2MB 4930ms 60ms cpython 3.13.5

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 173ms 1.8ms 16.8MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 177ms 3.9ms 16.5MB 163ms 0ms nim 2.2.4
python 1.py 331ms 3.3ms 85.1MB 290ms 30ms pypy 3.10.16
python 1.py 510ms 17ms 30.3MB 477ms 20ms pyston 3.8.12
python 1.py 622ms 9.0ms 30.0MB 590ms 17ms cpython 3.13.5

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 3588ms 2.7ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3609ms 14ms 1.4MB 3603ms 0ms nim 2.2.4
python 8.py timeout 0.0ms 14.8MB 33ms 10ms cpython 3.13.5
python 8.py timeout 0.0ms 95.9MB 787ms 80ms pypy 3.10.16
python 8.py timeout 0.0ms 14.4MB 33ms 10ms pyston 3.8.12

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 899ms 0.7ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 904ms 2.9ms 1.3MB 893ms 0ms nim 2.2.4
python 8.py timeout 0.0ms 14.5MB 47ms 13ms cpython 3.13.5
python 8.py timeout 0.0ms 95.6MB 1280ms 180ms pypy 3.10.16
python 8.py timeout 0.0ms 13.6MB 60ms 13ms pyston 3.8.12

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 226ms 0.3ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 229ms 0.9ms 1.3MB 220ms 0ms nim 2.2.4
python 8-m.py 1948ms 18ms 92.9MB 6303ms 253ms pypy 3.10.16
python 8.py timeout 0.0ms 14.3MB 80ms 20ms cpython 3.13.5
python 8.py timeout 0.0ms 13.1MB 150ms 30ms pyston 3.8.12