Rust versus C++ g++ 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	3.25	19,788	1535	12.89
C++ g++ #7	13.93	19,660	1156	13.93
Rust #6	4.00	19,652	1260	15.86
Rust #4	7.10	19,652	1026	27.94
Rust #5	7.88	19,784	1023	30.85
C++ g++ #5	7.97	19,788	987	31.14
C++ g++ #3	36.80	19,660	600	36.80
C++ g++ #4	9.47	19,660	1445	37.11
C++ g++ #2	9.82	19,656	1446	38.58
C++ g++	10.59	19,660	1065	41.61
Rust #2	18.53	19,780	1198	73.32
n-body
source	secs	mem	gz	cpu secs
C++ g++ #0	2.14	19,676	1933	2.14
Rust #9	2.20	19,660	1881	2.20
Rust #7	3.13	19,660	1759	3.13
Rust #2	3.92	19,660	1809	3.92
Rust #6	3.95	19,788	1796	3.95
C++ g++ #7	3.97	19,804	1815	3.97
C++ g++ #2	4.20	19,676	1884	4.19
Rust #8	4.51	19,788	1774	4.50
Rust #5	5.06	19,788	2224	5.06
Rust #4	5.21	19,660	1810	5.21
C++ g++ #3	5.30	19,804	1402	5.30
C++ g++ #9	5.43	19,676	1536	5.43
C++ g++ #4	5.44	19,804	1434	5.44
Rust	5.51	19,660	1483	5.51
Rust #3	5.60	19,656	1546	5.60
C++ g++ #5	6.01	19,676	1544	6.00
C++ g++	6.49	19,676	1666	6.49
C++ g++ #8	6.57	19,676	1524	6.57
C++ g++ #6	6.89	19,676	1674	6.89
spectral-norm
source	secs	mem	gz	cpu secs
Rust #2	0.72	19,668	1117	2.58
Rust	0.74	19,668	1262	2.60
Rust #3	0.79	19,796	1060	2.83
C++ g++ #6	0.72	19,812	1050	2.84
Rust #6	0.72	19,668	1132	2.84
Rust #4	0.72	19,796	823	2.85
Rust #7	0.72	19,796	938	2.85
Rust #5	0.72	19,668	1062	2.85
C++ g++ #5	1.32	19,684	1050	5.25
C++ g++	5.36	19,684	459	5.36
C++ g++ #8	1.52	19,684	1284	6.04
mandelbrot
source	secs	mem	gz	cpu secs
C++ g++	0.89	34,944	1797	3.46
C++ g++ #4	0.89	35,200	3554	3.47
Rust #4	0.96	33,280	1301	3.78
C++ g++ #6	0.98	35,072	1014	3.89
Rust #6	1.07	34,048	1338	4.20
Rust #8	1.06	33,280	770	4.21
Rust #7	1.06	33,280	763	4.21
Rust #5	1.12	33,920	725	4.40
Rust #3	1.14	19,656	1013	4.51
Rust	1.83	39,296	874	7.20
C++ g++ #0	2.35	35,328	2752	9.28
C++ g++ #8	4.79	35,072	749	13.12
C++ g++ #5	13.33	34,688	596	13.33
C++ g++ #9	3.50	35,200	732	13.49
C++ g++ #7	3.49	35,072	1023	13.90
C++ g++ #2	16.90	34,560	700	16.90
C++ g++ #3	27.26	19,804	421	27.25
pidigits
source	secs	mem	gz	cpu secs
Rust #4	0.71	19,660	804	0.71
C++ g++ #5	0.86	19,804	804	0.86
Rust	0.88	19,660	1426	0.88
Rust #3	0.88	19,660	1373	0.88
Rust #2	0.88	19,660	1312	0.88
C++ g++ #4	0.88	19,804	521	0.88
regex-redux
source	secs	mem	gz	cpu secs
Rust #6	1.19	153,584	994	1.44
Rust #5	1.28	202,584	777	1.52
Rust	1.30	154,416	811	1.52
Rust #4	1.30	199,540	771	1.54
Rust #3	1.31	202,684	726	1.56
Rust #2	1.34	153,896	707	1.58
Rust #7	0.78	150,272	2464	1.99
C++ g++ #6	1.15	276,276	2856	2.18
C++ g++ #2	2.84	212,776	706	3.60
C++ g++	3.62	212,180	662	3.62
C++ g++ #5	3.86	215,556	859	4.54
C++ g++ #3	12.41	217,580	859	17.91
C++ g++ #4		Make Error
fasta
source	secs	mem	gz	cpu secs
C++ g++ #8	0.76	19,792	2758	1.51
Rust #7	0.76	19,664	2533	1.51
C++ g++ #2	1.81	19,668	1129	1.81
C++ g++	1.90	19,664	1064	1.90
Rust #3	2.00	19,656	1235	2.00
C++ g++ #3	2.62	19,664	1311	2.62
Rust #8	0.92	19,784	1952	3.10
Rust #2	0.91	19,656	1910	3.29
Rust #5	0.91	19,656	1963	3.30
C++ g++ #4	3.32	19,664	1291	3.32
Rust #4	3.45	123,784	944	3.45
Rust #6	3.48	123,784	959	3.48
C++ g++ #6	1.05	19,668	2326	3.85
C++ g++ #5	1.05	19,668	2345	3.88
Rust	4.52	19,656	1240	4.52
C++ g++ #7		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	1.97	156,504	1634	5.87
Rust #7	2.86	134,084	1585	9.12
Rust #8	3.68	137,580	1549	10.41
Rust #6	2.90	159,464	1697	10.51
Rust #5	3.91	137,764	1745	11.86
C++ g++ #3	4.19	165,592	1280	13.77
C++ g++	6.90	757,080	1452	14.68
Rust #2	6.10	139,388	1350	16.32
Rust #9	6.77	135,684	1850	18.07
Rust #4	6.70	137,288	1755	18.12
Rust	21.62	157,080	1086	64.67
reverse-complement
source	secs	mem	gz	cpu secs
C++ g++ #2	0.70	499,840	2099	0.70
Rust	0.52	498,816	2762	0.83
Rust #2	0.85	995,200	1332	1.50
Rust #3	0.87	995,072	1105	1.58
C++ g++ #6	3.20	1,517,660	1827	4.22
C++ g++	6.56	980,060	599	6.56
C++ g++ #5	35.10	771,556	704	35.10
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.95	201,400	896	3.30
Rust #5	1.08	198,528	771	3.82
C++ g++ #5	1.14	200,660	891	3.98
Rust #2	1.22	199,676	729	4.29
C++ g++ #9	1.72	135,936	815	4.46
C++ g++ #6	1.88	266,112	851	4.47
Rust #4	1.29	189,052	765	4.67
C++ g++ #3	1.88	265,600	951	4.72
Rust #3	1.39	198,860	762	5.04
C++ g++ #8	2.18	265,984	826	5.11
Rust	2.04	133,120	760	7.21
C++ g++	2.65	2,040,792	760	9.07
C++ g++ #2	21.51	265,856	514	21.51
C++ g++ #4		Make Error
Rust	1.76.0 (07dca489a 2024-02-04) LLVM version: 17.0.6
C++ g++	Ubuntu 13.2.0-4ubuntu3