C++ g++ versus Rust fastest performance

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++ g++ #6	3.23	10,936	1528	12.80
Rust #6	3.51	11,036	1253	13.93
C++ g++ #7	14.04	10,912	1150	14.04
Rust #4	7.21	10,932	1020	28.34
Rust #5	7.77	10,932	1016	30.49
C++ g++ #5	7.99	10,936	980	31.23
C++ g++ #3	36.06	10,908	593	36.05
C++ g++ #2	9.51	10,912	1440	37.33
C++ g++ #4	9.82	10,912	1439	38.52
C++ g++	10.39	10,912	1059	40.77
Rust #2	17.99	11,036	1191	70.95
n-body
source	secs	mem	gz	cpu secs
C++ g++ #0	2.14	10,960	1927	2.14
Rust #9	2.81	11,068	1874	2.81
Rust #7	3.27	11,068	1753	3.27
Rust #6	3.92	11,068	1790	3.92
C++ g++ #2	4.44	10,960	1879	4.44
C++ g++ #7	4.44	10,960	1808	4.44
C++ g++ #9	4.88	10,960	1530	4.88
C++ g++ #4	5.44	10,960	1428	5.44
Rust #3	5.63	11,068	1540	5.63
Rust	5.63	11,068	1480	5.63
C++ g++ #6	5.70	10,960	1668	5.70
C++ g++ #3	5.76	10,960	1396	5.76
C++ g++	5.97	10,960	1659	5.97
Rust #2	5.98	11,068	1805	5.98
Rust #8	6.01	11,068	1767	6.01
Rust #5	6.12	11,068	2220	6.11
Rust #4	6.20	11,068	1803	6.20
C++ g++ #8	6.53	10,960	1517	6.53
C++ g++ #5	6.89	11,016	1538	6.88
spectral-norm
source	secs	mem	gz	cpu secs
C++ g++ #6	0.71	10,984	1044	2.84
Rust #6	0.71	11,124	1126	2.84
Rust #7	0.72	11,128	932	2.84
Rust #5	0.72	11,124	1055	2.84
Rust #4	0.72	11,124	817	2.84
Rust #2	0.72	11,124	1110	2.85
Rust	0.72	11,124	1254	2.85
Rust #3	0.78	11,124	1053	3.07
C++ g++ #5	1.32	10,984	1044	5.25
C++ g++	5.36	10,984	452	5.36
C++ g++ #8	1.52	10,992	1278	6.09
mandelbrot
source	secs	mem	gz	cpu secs
C++ g++	0.89	34,012	1791	3.46
C++ g++ #4	0.88	34,664	3542	3.48
C++ g++ #6	0.98	34,768	1002	3.88
Rust #4	1.01	32,380	1295	3.99
Rust #6	1.06	34,120	1332	4.18
Rust #5	1.12	33,868	719	4.41
Rust #3	1.15	13,452	1007	4.58
Rust #7	1.42	32,124	757	5.64
Rust #8	1.42	32,176	763	5.64
Rust	2.05	38,724	868	8.09
C++ g++ #0	2.34	34,204	2739	9.28
C++ g++ #8	4.78	34,288	742	13.11
C++ g++ #5	13.35	33,504	590	13.35
C++ g++ #9	3.50	34,292	726	13.49
C++ g++ #7	3.49	34,304	1017	13.89
C++ g++ #2	16.91	34,008	692	16.90
C++ g++ #3	28.09	10,956	414	28.09
pidigits
source	secs	mem	gz	cpu secs
Rust #4	0.71	11,068	799	0.71
C++ g++ #5	0.87	10,956	798	0.87
Rust #2	0.88	11,068	1306	0.88
Rust #3	0.88	11,068	1366	0.88
C++ g++ #4	0.89	10,956	513	0.88
Rust	0.89	11,068	1420	0.88
regex-redux
source	secs	mem	gz	cpu secs
Rust #6	1.34	152,724	986	1.80
Rust #5	1.40	204,604	771	1.82
Rust #4	1.43	204,656	765	1.85
Rust	1.46	153,312	804	1.87
Rust #3	1.42	205,228	719	1.88
Rust #2	1.50	153,320	701	1.90
Rust #7	0.78	149,524	2458	1.99
C++ g++ #6	1.13	275,984	2850	2.18
C++ g++	3.55	211,848	656	3.55
C++ g++ #2	2.83	212,460	700	3.59
C++ g++ #5	3.78	215,276	852	4.49
C++ g++ #3	13.26	217,376	853	19.13
C++ g++ #4		Make Error
fasta
source	secs	mem	gz	cpu secs
C++ g++ #8	0.77	10,944	2751	1.52
Rust #7	0.76	11,068	2529	1.52
C++ g++ #2	1.87	10,940	1127	1.86
C++ g++	1.96	10,936	1057	1.96
Rust #3	2.00	11,036	1233	2.00
C++ g++ #3	2.64	10,940	1307	2.64
Rust #5	0.90	11,060	1961	3.08
Rust #2	0.90	11,068	1906	3.16
C++ g++ #4	3.34	10,940	1287	3.34
Rust #4	3.46	123,660	939	3.46
Rust #6	3.50	123,660	955	3.50
Rust #8	0.92	11,068	1946	3.50
C++ g++ #5	1.04	10,940	2344	3.66
C++ g++ #6	1.03	10,936	2324	3.83
Rust	4.52	11,036	1237	4.52
C++ g++ #7		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	1.96	156,360	1631	5.87
Rust #7	2.88	133,236	1578	9.14
Rust #8	3.56	137,632	1543	10.34
Rust #6	2.88	158,788	1691	10.48
Rust #5	4.08	137,648	1739	11.99
C++ g++ #3	4.16	165,784	1276	13.84
C++ g++	6.80	756,220	1446	14.43
Rust #2	6.30	137,548	1347	16.69
Rust #9	6.54	136,008	1841	17.81
Rust #4	6.95	136,744	1749	18.88
Rust	21.93	155,840	1078	65.94
reverse-complement
source	secs	mem	gz	cpu secs
C++ g++ #2	0.68	499,568	2093	0.68
Rust	0.47	498,844	3040	0.77
Rust #2	0.80	995,004	1330	1.45
Rust #3	0.81	995,004	1097	1.50
C++ g++ #6	3.03	1,515,936	1832	4.05
C++ g++	6.35	979,820	592	6.35
C++ g++ #5	35.73	771,156	720	35.72
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.94	201,600	890	3.31
Rust #5	1.08	198,984	765	3.82
C++ g++ #5	1.13	200,428	885	4.05
C++ g++ #9	1.45	135,832	809	4.10
Rust #2	1.19	200,532	721	4.27
C++ g++ #6	1.80	265,520	844	4.39
Rust #4	1.28	198,772	756	4.62
C++ g++ #3	1.80	265,092	945	4.69
Rust #3	1.36	198,464	754	4.93
C++ g++ #8	2.14	265,536	820	5.12
Rust	2.10	132,828	751	7.39
C++ g++	2.65	1,946,308	754	9.06
C++ g++ #2	23.13	265,616	508	23.13
C++ g++ #4		Make Error
C++ g++	Ubuntu 12.2.0-3ubuntu1
Rust	1.67.0 (fc594f156 2023-01-24) LLVM version: 15.0.6