Rust versus C clang fastest performance

How the programs are written matters! Always look at the source code.

If the fastest programs are * hand-written vector instructions, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code.

fannkuch-redux
source	secs	mem	gz	cpu secs
* C clang #6	2.24	19,772	1582	8.86
* C clang #4	13.37	19,772	1190	13.37
* Rust #6	3.86	19,684	1260	15.17
Rust #4	6.92	19,684	1026	27.13
Rust #5	7.45	19,684	1023	29.32
C clang #5	8.09	19,772	917	31.94
* C clang #2	8.67	19,772	1563	34.02
C clang #3	34.16	19,772	574	34.15
Rust #2	9.15	19,684	1198	35.91
C clang #8	36.39	19,492	483	36.38
C clang	36.51	19,772	514	36.50
n-body
source	secs	mem	gz	cpu secs
* Rust #9	2.19	19,624	1881	2.19
* C clang #9	2.20	19,772	1639	2.20
* Rust #7	3.23	19,624	1759	3.23
Rust #3	3.46	19,624	1774	3.45
Rust #2	3.64	19,624	1809	3.64
* Rust #6	4.36	19,624	1796	4.35
* C clang #5	4.86	19,772	1436	4.86
* Rust #5	5.01	19,624	2224	5.01
Rust #4	5.11	19,624	1810	5.11
C clang #6	5.16	19,772	1186	5.16
C clang	5.37	19,772	1179	5.37
C clang #2	5.42	19,772	1270	5.42
Rust	5.52	19,624	1483	5.52
* C clang #4	5.60	19,772	1398	5.59
C clang #8	5.72	19,492	1193	5.72
C clang #3	6.12	19,772	1214	6.12
C clang #7	6.77	19,772	1250	6.77
spectral-norm
source	secs	mem	gz	cpu secs
* C clang #6	0.38	19,772	1203	1.52
* Rust	0.72	19,632	1262	2.80
* Rust #2	0.72	19,632	1117	2.80
Rust #4	0.72	19,632	823	2.85
* Rust #5	0.72	19,632	1062	2.85
* Rust #6	0.72	19,632	1132	2.85
* Rust #3	0.74	19,632	1060	2.86
* C clang #4	0.72	19,772	1145	2.86
* C clang #2	0.72	19,772	941	2.87
* C clang #5	0.72	19,772	576	2.88
C clang #8	5.40	19,772	389	5.40
C clang #3	1.46	19,772	470	5.77
* C clang #7	1.82	19,772	906	7.24
* Rust #7		Make Error
mandelbrot
source	secs	mem	gz	cpu secs
* Rust #4	0.95	33,392	1301	3.77
* Rust #6	1.07	34,152	1338	4.20
Rust #2	1.09	33,384	770	4.33
Rust #7	1.10	33,380	763	4.37
Rust #5	1.11	33,956	725	4.37
Rust #3	1.14	19,624	1013	4.54
C clang #9	1.22	34,332	700	4.85
C clang #5	1.53	34,864	788	6.09
Rust	2.00	39,404	874	7.88
* C clang #4	3.47	34,328	805	13.82
* C clang	3.49	33,172	828	13.93
* C clang #7	3.53	34,216	1000	14.00
* C clang #3	3.55	33,108	769	14.15
C clang #8	25.27	19,496	412	25.27
* C clang #6		Make Error
fasta
source	secs	mem	gz	cpu secs
C clang #3	0.78	19,772	1469	0.78
C clang #5	1.20	19,772	1286	1.20
* Rust #7	0.77	19,624	2533	1.54
Rust #3	1.98	19,624	1235	1.98
C clang #2	2.43	19,616	1299	2.43
C clang #6	1.03	19,772	1936	3.03
Rust #9	0.94	19,624	1952	3.22
C clang #7	0.82	19,772	2276	3.27
Rust #5	0.93	19,624	1963	3.34
Rust #2	0.92	19,624	1910	3.40
Rust #6	3.46	123,848	959	3.46
C clang	3.46	19,772	1213	3.46
Rust #4	3.47	123,848	944	3.46
Rust	4.25	19,624	1240	4.25
C clang #8	8.02	19,956	839	8.02
C clang #4		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
Rust #7	2.67	133,824	1585	8.21
Rust #3	3.21	137,564	1549	9.51
Rust #6	2.80	159,764	1697	10.03
Rust #5	3.82	137,924	1745	11.17
C clang	6.30	129,228	1512	13.92
Rust #2	5.87	138,292	1350	15.32
Rust #9	6.63	136,168	1850	17.12
Rust #4	6.73	137,308	1755	18.72
Rust	21.46	157,492	1086	66.75
reverse-complement
source	secs	mem	gz	cpu secs
* C clang #7	0.45	499,996	1899	0.63
C clang #9	0.46	499,976	1551	0.70
* Rust	0.53	498,952	2762	0.84
Rust #2	0.95	995,220	1332	1.58
C clang #2	1.16	994,536	757	1.69
Rust #3	0.97	995,156	1105	1.69
C clang #5	2.08	994,108	654	2.07
* C clang #4	3.74	500,452	716	3.74
C clang #6	1.03	703,416	828	4.07
binary-trees
source	secs	mem	gz	cpu secs
Rust #5	1.09	198,720	771	3.84
Rust #2	1.19	199,796	729	4.21
Rust #3	1.39	189,928	762	5.00
Rust #4	1.39	199,084	765	5.01
C clang #2	1.66	170,236	816	5.36
C clang #3	1.89	134,272	842	5.88
Rust	2.04	132,952	760	7.26
C clang	17.79	264,064	660	17.79
C clang #8	19.63	285,536	607	19.62
C clang #5	9.25	351,328	914	33.65
pidigits
source	secs	mem	gz	cpu secs
Rust #4	0.71	19,624	804	0.71
C clang #2	0.74	19,772	422	0.74
* Rust #3	0.74	19,624	1373	0.74
* Rust #2	0.74	19,624	1312	0.74
C clang	0.74	19,772	459	0.74
* Rust	0.74	19,624	1426	0.74
regex-redux
source	secs	mem	gz	cpu secs
Rust #6	1.17	153,780	994	1.42
Rust	1.34	153,972	811	1.56
Rust #5	1.33	202,800	777	1.57
Rust #4	1.34	199,684	771	1.58
Rust #3	1.34	202,952	726	1.59
Rust #2	1.38	153,932	707	1.63
* Rust #7	0.78	148,924	2464	2.00
C clang #5	0.82	154,568	1403	2.82
C clang #2	3.22	103,364	1121	3.22
C clang #4	0.98	154,488	1237	3.82
C clang #3	1.75	105,848	1273	4.31
Rust	1.83.0 (90b35a623 2024-11-26) LLVM version: 19.1.1
C clang	Ubuntu clang version 18.1.8 (11)