Wren VS Nim benchmarks

Current benchmark data was generated on Sun Sep 27 2026, full log can be found HERE

CONTRIBUTIONS are WELCOME!

CPU INFO:[x86_64][4 cores] Intel(R) Core(TM) i7-3687U CPU @ 2.10GHz (Model 58)

* -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.)

show numbers without parallelization

show numbers with parallelization

binarytrees

Input: 18

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	2.nim	1224ms	7.0ms	35.9MB	1200ms	7ms	nim 2.2.4
nim	2.nim	1502ms	17ms	35.0MB	1483ms	3ms	nim/clang 2.2.4
wren	1.wren	18359ms	175ms	122.3MB	18307ms	37ms	wren 0.4.0

Input: 15

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	2.nim	117ms	20ms	7.3MB	95ms	0ms	nim 2.2.4
nim	2.nim	124ms	5.3ms	5.9MB	110ms	0ms	nim/clang 2.2.4
wren	1.wren	1601ms	19ms	122.2MB	1547ms	37ms	wren 0.4.0

coro-prime-sieve

Input: 4000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
wren	1.wren	604ms	4.3ms	4.7MB	590ms	0ms	wren 0.4.0
nim	6.nim	855ms	23ms	4.7MB	837ms	0ms	nim 2.2.4
nim	6.nim	932ms	9.4ms	3.0MB	920ms	0ms	nim/clang 2.2.4
nim	5.nim	7274ms	50ms	8.1MB	7223ms	30ms	nim 2.2.4
nim	5.nim	8047ms	172ms	6.4MB	7997ms	33ms	nim/clang 2.2.4
nim	3.nim	26905ms	184ms	11.5MB	26857ms	27ms	nim/clang 2.2.4
nim	3.nim	27665ms	109ms	14.5MB	27613ms	30ms	nim 2.2.4
nim	1.nim	107046ms	771ms	2036.8MB	71373ms	33600ms	nim/clang 2.2.4
nim	1.nim	108677ms	212ms	2036.9MB	72837ms	33773ms	nim 2.2.4

Input: 1000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
wren	1.wren	45ms	1.6ms	3.2MB	37ms	0ms	wren 0.4.0
nim	6.nim	57ms	2.7ms	3.6MB	47ms	0ms	nim 2.2.4
nim	6.nim	65ms	0.3ms	1.9MB	53ms	0ms	nim/clang 2.2.4
nim	5.nim	417ms	4.9ms	4.6MB	403ms	0ms	nim 2.2.4
nim	5.nim	474ms	9.7ms	2.9MB	460ms	0ms	nim/clang 2.2.4
nim	3.nim	1171ms	6.6ms	6.0MB	1163ms	0ms	nim 2.2.4
nim	3.nim	1197ms	26ms	3.8MB	1187ms	0ms	nim/clang 2.2.4
nim	1.nim	5324ms	41ms	522.5MB	3093ms	1793ms	nim 2.2.4
nim	1.nim	5430ms	115ms	518.9MB	3183ms	1807ms	nim/clang 2.2.4

helloworld

Input: QwQ

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	1.nim	1.5ms	0.1ms	1.3MB	0ms	0ms	nim/clang 2.2.4
nim	1.nim	2.5ms	0.5ms	2.1MB	0ms	0ms	nim 2.2.4
wren	1.wren	3.2ms	1.0ms	2.4MB	0ms	0ms	wren 0.4.0

nbody

Input: 5000000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	2.nim	494ms	1.4ms	2.1MB	480ms	0ms	nim 2.2.4
nim	2.nim	542ms	9.6ms	1.4MB	530ms	0ms	nim/clang 2.2.4
wren	1.wren	80930ms	4424ms	135.7MB	80847ms	60ms	wren 0.4.0

Input: 500000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	2.nim	55ms	2.9ms	2.1MB	47ms	0ms	nim 2.2.4
nim	2.nim	58ms	1.0ms	1.3MB	50ms	0ms	nim/clang 2.2.4
wren	1.wren	7840ms	216ms	135.6MB	7780ms	43ms	wren 0.4.0

spectral-norm

Input: 8000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	1.nim	11029ms	35ms	1.3MB	11017ms	0ms	nim/clang 2.2.4
nim	1.nim	11039ms	7.6ms	3.4MB	11027ms	0ms	nim 2.2.4
wren	1.wren	timeout (300s)	—	—	—	—	wren 0.4.0

Input: 4000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	1.nim	2764ms	2.5ms	1.4MB	2753ms	0ms	nim/clang 2.2.4
nim	1.nim	2767ms	4.2ms	2.1MB	2753ms	0ms	nim 2.2.4
wren	1.wren	timeout (120s)	—	—	—	—	wren 0.4.0

Input: 2000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
nim	1.nim	695ms	0.3ms	1.3MB	683ms	0ms	nim/clang 2.2.4
nim	1.nim	696ms	2.1ms	2.1MB	687ms	0ms	nim 2.2.4
wren	1.wren	44500ms	547ms	7.7MB	44483ms	0ms	wren 0.4.0