C++ g++ versus Rust 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
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #6	3.33	5,800	1535	13.117
* C++ g++ #7	14.06	2,449	1156	14.04—14.11
* Rust #6	3.81	4,137	1260	15.15—15.33
Rust #4	6.90	4,141	1026	27.123
Rust #5	7.47	3,985	1023	29.335
C++ g++ #5	7.86	5,792	987	30.73—30.82
C++ g++ #4	8.91	5,710	1445	34.99—35.47
C++ g++ #2	9.14	5,698	1446	35.88—36.26
Rust #2	9.16	3,985	1198	35.928
C++ g++ #3	37.89	2,351	600	37.90—37.99
C++ g++	10.53	5,534	1065	41.25—41.55
n-body
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #0	2.15	2,417	1933	2.155
* Rust #9	2.19	3,195	1881	1.45—4.13
* Rust #7	3.24	2,937	1759	3.238
Rust #3	3.46	3,023	1774	3.463
Rust #2	3.65	3,019	1809	3.647
* C++ g++ #7	4.09	5,124	1815	4.12—4.17
* Rust #6	4.36	3,019	1796	4.00—5.52
* Rust #5	5.02	3,027	2224	5.024
Rust #4	5.13	3,019	1810	4.74—6.21
C++ g++ #9	5.15	2,486	1536	5.169
C++ g++ #3	5.33	2,482	1402	5.336
* C++ g++ #4	5.46	2,482	1434	5.456
Rust	5.52	3,019	1483	5.55—5.67
* C++ g++ #2	6.02	2,490	1524	6.02—6.10
C++ g++ #5	6.33	2,478	1544	6.345
C++ g++	6.62	2,499	1666	6.636
C++ g++ #6	6.94	2,499	1674	6.93—6.98
spectral-norm
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #6	0.72	4,293	1132	2.851
Rust #4	0.72	4,014	823	2.852
* Rust #5	0.72	3,981	1062	2.854
* Rust	0.72	4,276	1262	2.860
* C++ g++ #6	0.72	3,981	1050	2.859
* Rust #2	0.73	4,264	1117	2.859
* Rust #3	0.74	4,010	1060	2.936
* C++ g++ #5	1.33	5,820	1050	5.284
C++ g++	5.34	5,292	459	5.341
C++ g++ #7	1.53	4,071	1284	6.067
* Rust #7		Empty
mandelbrot
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #4	0.89	37,941	3554	3.464
* C++ g++	0.90	37,626	1797	3.479
* Rust #4	0.95	35,955	1301	3.780
* C++ g++ #6	0.98	37,908	1014	3.874
* Rust #6	1.08	36,385	1338	4.216
Rust #2	1.10	36,016	770	4.340
Rust #5	1.12	36,549	725	4.375
Rust #7	1.11	35,934	763	4.378
Rust #3	1.15	14,008	1013	4.569
Rust	2.03	42,541	874	7.895
C++ g++ #0	2.36	38,281	2752	9.314
* C++ g++ #7	4.87	38,048	749	13.299
C++ g++ #5	13.47	36,884	596	13.493
C++ g++ #9	3.53	37,863	732	13.587
C++ g++ #2	16.96	36,704	700	16.960
C++ g++ #3	27.38	5,181	421	27.381
fasta
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #7	0.78	4,866	2533	1.547
C++ g++ #9	0.78	6,214	2758	1.558
C++ g++ #2	1.85	5,108	1129	1.849
C++ g++	1.93	5,104	1064	1.930
Rust #3	1.98	2,933	1235	1.982
C++ g++ #3	2.63	5,284	1311	2.632
C++ g++ #7	0.88	6,304	2711	3.060
Rust #9	0.94	5,362	1952	3.22—3.29
C++ g++ #4	3.34	2,363	1291	3.335
Rust #5	0.94	5,505	1963	3.33—3.44
Rust #2	0.94	5,550	1910	3.45—3.49
Rust #6	3.48	128,033	959	3.483
Rust #4	3.48	128,160	944	3.483
C++ g++ #5	1.07	7,012	2345	3.69—3.73
C++ g++ #6	1.08	7,127	2326	3.901
Rust	4.49	2,990	1240	4.51—4.55
k-nucleotide
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #2	2.02	162,349	1634	6.05—6.54
Rust #7	2.61	139,071	1585	8.24—8.48
Rust #3	3.24	141,701	1549	9.47—9.81
Rust #6	2.81	165,057	1697	10.17—10.43
Rust #5	3.82	143,118	1745	11.24—11.54
C++ g++ #3	4.19	171,622	1280	13.83—14.44
C++ g++	7.04	778,510	1452	15.17—15.69
Rust #2	6.05	143,139	1350	15.52—16.06
Rust #9	6.58	140,845	1850	17.36—18.41
Rust #4	6.76	142,778	1755	18.78—19.84
Rust	21.38	159,539	1086	65.36—66.34
reverse-complement
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #2	0.76	514,101	2099	0.757
* Rust	0.54	513,090	2762	0.850
Rust #2	0.99	1,022,960	1332	1.626
Rust #3	1.00	1,022,190	1105	1.730
C++ g++	6.55	1,006,805	599	6.55—6.68
C++ g++ #5	37.66	792,846	704	37.65—37.69
C++ g++ #6		Bad Output
C++ g++ #3		Bad Output
binary-trees
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #7	1.01	175,108	896	3.46—3.62
Rust #5	1.10	137,413	771	3.95—4.10
C++ g++ #5	1.17	208,171	891	4.12—4.17
Rust #2	1.21	141,509	729	4.32—4.38
C++ g++ #9	1.76	140,571	815	4.66—4.82
C++ g++ #6	1.93	273,973	851	4.90—5.09
Rust #4	1.38	171,651	765	5.04—5.11
Rust #3	1.40	162,599	762	5.04—5.12
C++ g++ #3	2.28	273,715	951	5.06—5.10
C++ g++ #4	2.22	273,977	826	5.20—5.33
Rust	2.07	137,667	760	7.21—7.27
C++ g++	2.69	1,896,727	760	9.43—9.52
C++ g++ #2	22.77	274,080	514	22.81—23.05
pidigits
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #4	0.72	3,994	804	0.716
C++ g++ #4	0.72	6,496	521	0.717
* C++ g++ #5	0.73	6,300	804	0.730
* Rust	0.75	4,239	1426	0.749
* Rust #2	0.75	4,243	1312	0.748
* Rust #3	0.75	4,481	1373	0.748
regex-redux
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #6	1.18	160,154	994	1.429
Rust #5	1.34	210,186	777	1.580
Rust	1.33	160,023	811	1.56—1.61
Rust #4	1.35	206,840	771	1.598
Rust #3	1.36	210,850	726	1.59—1.65
Rust #2	1.39	160,625	707	1.642
* Rust #7	0.79	155,496	2464	2.008
C++ g++ #6	1.14	285,639	2856	2.249
C++ g++ #3	12.37	222,614	859	18.03—18.68
C++ g++		Empty
C++ g++ #2		Empty
C++ g++ #5		Empty
C++ g++ #4		Empty
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Rust	1.83.0 (90b35a623 2024-11-26) LLVM version: 19.1.1