Rust versus C++ g++ 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++ g++ #6	3.31	19,760	1535	13.11
* C++ g++ #7	14.03	19,760	1156	14.03
* 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++ g++ #5	7.85	19,760	987	30.68
C++ g++ #4	8.92	19,760	1445	35.00
C++ g++ #2	9.13	19,760	1446	35.73
Rust #2	9.15	19,684	1198	35.91
C++ g++ #3	37.88	19,760	600	37.87
C++ g++	10.49	19,760	1065	41.21
n-body
source	secs	mem	gz	cpu secs
* C++ g++ #0	2.15	19,760	1933	2.15
* Rust #9	2.19	19,624	1881	2.19
* 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
* C++ g++ #7	4.11	19,760	1815	4.11
* Rust #6	4.36	19,624	1796	4.35
* Rust #5	5.01	19,624	2224	5.01
Rust #4	5.11	19,624	1810	5.11
C++ g++ #9	5.14	19,760	1536	5.14
C++ g++ #3	5.32	19,760	1402	5.32
* C++ g++ #4	5.45	19,760	1434	5.45
Rust	5.52	19,624	1483	5.52
* C++ g++ #2	6.02	19,352	1524	6.01
C++ g++ #5	6.32	19,760	1544	6.32
C++ g++	6.61	19,760	1666	6.61
C++ g++ #6	6.93	19,760	1674	6.93
spectral-norm
source	secs	mem	gz	cpu secs
* 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
* C++ g++ #6	0.73	19,760	1050	2.86
* Rust #3	0.74	19,632	1060	2.86
* C++ g++ #5	1.33	19,760	1050	5.28
C++ g++	5.33	19,760	459	5.33
C++ g++ #7	1.52	19,512	1284	6.04
* Rust #7		Make Error
mandelbrot
source	secs	mem	gz	cpu secs
* C++ g++ #4	0.89	35,344	3554	3.45
* C++ g++	0.89	34,952	1797	3.47
* Rust #4	0.95	33,392	1301	3.77
* C++ g++ #6	0.98	35,080	1014	3.87
* 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
Rust	2.00	39,404	874	7.88
C++ g++ #0	2.35	35,476	2752	9.30
* C++ g++ #7	4.86	35,176	749	13.28
C++ g++ #5	13.44	34,636	596	13.43
C++ g++ #9	3.52	35,120	732	13.55
C++ g++ #2	16.95	34,636	700	16.94
C++ g++ #3	27.37	19,760	421	27.36
fasta
source	secs	mem	gz	cpu secs
* Rust #7	0.77	19,624	2533	1.54
C++ g++ #9	0.78	19,352	2758	1.54
C++ g++ #2	1.84	19,760	1129	1.84
C++ g++	1.92	19,760	1064	1.92
Rust #3	1.98	19,624	1235	1.98
C++ g++ #3	2.63	19,760	1311	2.63
C++ g++ #7	0.87	19,760	2711	3.05
Rust #9	0.94	19,624	1952	3.22
C++ g++ #4	3.32	19,760	1291	3.32
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
Rust #4	3.47	123,848	944	3.46
C++ g++ #5	1.06	19,760	2345	3.66
C++ g++ #6	1.07	19,760	2326	4.01
Rust	4.25	19,624	1240	4.25
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	2.01	156,592	1634	5.98
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++ g++ #3	4.19	165,580	1280	13.94
C++ g++	6.96	757,156	1452	14.75
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++ g++ #2	0.74	499,916	2099	0.74
* Rust	0.53	498,952	2762	0.84
Rust #2	0.95	995,220	1332	1.58
Rust #3	0.97	995,156	1105	1.69
C++ g++ #6	3.30	1,517,824	1827	4.38
C++ g++	6.52	980,156	599	6.51
C++ g++ #5	37.59	771,632	704	37.58
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.97	201,512	896	3.40
Rust #5	1.09	198,720	771	3.84
C++ g++ #5	1.16	200,724	891	4.10
Rust #2	1.19	199,796	729	4.21
C++ g++ #9	1.74	136,120	815	4.63
C++ g++ #3	1.91	265,636	951	4.74
C++ g++ #6	1.91	266,120	851	4.77
Rust #3	1.39	189,928	762	5.00
Rust #4	1.39	199,084	765	5.01
C++ g++ #4	2.22	266,136	826	5.20
Rust	2.04	132,952	760	7.26
C++ g++	2.65	2,153,044	760	9.23
C++ g++ #2	22.83	265,840	514	22.82
pidigits
source	secs	mem	gz	cpu secs
Rust #4	0.71	19,624	804	0.71
C++ g++ #4	0.71	19,760	521	0.71
* C++ g++ #5	0.73	19,760	804	0.73
* Rust #3	0.74	19,624	1373	0.74
* Rust #2	0.74	19,624	1312	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++ g++ #6	1.15	276,336	2856	2.24
C++ g++ #3	12.38	215,640	859	17.95
C++ g++		Make Error
C++ g++ #2		Make Error
C++ g++ #5		Make Error
C++ g++ #4		Make Error
Rust	1.83.0 (90b35a623 2024-11-26) LLVM version: 19.1.1
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0