Fortran VS C 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

fasta

Input: 2500000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
fortran	4.f90	177ms	14ms	1.5MB	167ms	0ms	gfortran 13.3.0

Input: 250000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
fortran	4.f90	23ms	3.7ms	2.7MB	13ms	0ms	gfortran 13.3.0

helloworld

Input: QwQ

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	1.c	1.7ms	0.2ms	1.1MB	0ms	0ms	gcc 13.3.0
fortran	1.f90	1.7ms	0.3ms	1.6MB	0ms	0ms	gfortran 13.3.0
c	1.c	1.8ms	0.3ms	1.6MB	0ms	0ms	clang 18.1.3

nbody

Input: 5000000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	8-i.c	393ms	4.7ms	1.1MB	387ms	0ms	gcc 13.3.0
c	5.c	483ms	1.6ms	1.5MB	470ms	0ms	clang 18.1.3
c	2.c	520ms	1.4ms	1.0MB	510ms	0ms	gcc 13.3.0
c	5.c	541ms	2.5ms	1.1MB	530ms	0ms	gcc 13.3.0
c	2.c	549ms	1.2ms	1.5MB	540ms	0ms	clang 18.1.3
c	8-i.c	555ms	0.8ms	1.5MB	550ms	0ms	clang 18.1.3
fortran	2.f90	610ms	47ms	1.5MB	600ms	0ms	gfortran 13.3.0

Input: 500000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	8-i.c	42ms	1.4ms	1.1MB	30ms	0ms	gcc 13.3.0
c	5.c	52ms	1.1ms	1.5MB	40ms	0ms	clang 18.1.3
c	2.c	55ms	0.3ms	1.1MB	50ms	0ms	gcc 13.3.0
c	5.c	59ms	2.8ms	1.1MB	50ms	0ms	gcc 13.3.0
c	2.c	59ms	1.7ms	1.5MB	50ms	0ms	clang 18.1.3
c	8-i.c	61ms	3.7ms	1.5MB	53ms	0ms	clang 18.1.3
fortran	2.f90	65ms	1.1ms	1.6MB	57ms	0ms	gfortran 13.3.0

spectral-norm

Input: 8000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	6-im.c	1696ms	2.3ms	5.2MB	6667ms	17ms	clang 18.1.3
c	6-im.c	1825ms	12ms	2.1MB	7167ms	0ms	gcc 13.3.0
c	4-m.c	2992ms	24ms	5.2MB	11847ms	10ms	clang 18.1.3
c	4-m.c	3065ms	33ms	2.4MB	12143ms	3ms	gcc 13.3.0
c	5-im.c	3141ms	26ms	5.2MB	12413ms	10ms	clang 18.1.3
c	5-im.c	3152ms	6.6ms	1.4MB	12477ms	0ms	gcc 13.3.0
c	3-m.c	5834ms	6.1ms	3.3MB	23127ms	10ms	clang 18.1.3
c	3-m.c	5845ms	11ms	1.4MB	23160ms	3ms	gcc 13.3.0
fortran	3-m.f90	6051ms	7.3ms	1.5MB	23903ms	3ms	gfortran 13.3.0
fortran	2.f90	11153ms	19ms	2.5MB	11143ms	0ms	gfortran 13.3.0

Input: 4000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	6-im.c	435ms	3.9ms	3.3MB	1680ms	0ms	clang 18.1.3
c	6-im.c	503ms	87ms	1.1MB	1907ms	0ms	gcc 13.3.0
c	5-im.c	787ms	0.9ms	1.4MB	3087ms	0ms	gcc 13.3.0
c	5-im.c	790ms	4.1ms	3.3MB	3097ms	0ms	clang 18.1.3
c	4-m.c	790ms	73ms	3.2MB	3080ms	3ms	clang 18.1.3
c	4-m.c	834ms	106ms	1.5MB	3233ms	0ms	gcc 13.3.0
c	3-m.c	1463ms	1.5ms	1.4MB	5773ms	0ms	gcc 13.3.0
c	3-m.c	1467ms	4.2ms	3.3MB	5757ms	0ms	clang 18.1.3
fortran	3-m.f90	1522ms	3.5ms	1.5MB	5970ms	3ms	gfortran 13.3.0
fortran	2.f90	2795ms	3.4ms	1.6MB	2783ms	0ms	gfortran 13.3.0

Input: 2000

lang	code	time	stddev	peak-mem mem	time(user)	time(sys)	compiler compiler/runtime
c	6-im.c	116ms	0.7ms	5.6MB	420ms	7ms	clang 18.1.3
c	6-im.c	123ms	0.3ms	3.1MB	453ms	0ms	gcc 13.3.0
c	4-m.c	200ms	6.3ms	3.2MB	733ms	7ms	clang 18.1.3
c	4-m.c	200ms	0.9ms	1.4MB	763ms	0ms	gcc 13.3.0
c	5-im.c	202ms	2.1ms	5.2MB	753ms	3ms	clang 18.1.3
c	5-im.c	208ms	3.0ms	1.4MB	790ms	0ms	gcc 13.3.0
c	3-m.c	370ms	0.5ms	3.3MB	1430ms	0ms	clang 18.1.3
c	3-m.c	371ms	0.9ms	1.5MB	1440ms	0ms	gcc 13.3.0
fortran	3-m.f90	391ms	2.4ms	1.6MB	1477ms	0ms	gfortran 13.3.0
fortran	2.f90	703ms	3.3ms	1.5MB	687ms	0ms	gfortran 13.3.0