Rust versus Swift 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
* Rust #6	3.81	4,137	1260	15.16—15.32
Rust #4	6.90	4,141	1026	27.12
Rust #5	7.47	3,985	1023	29.34
* Swift #3	8.22	13,808	1103	32.51—32.60
Swift #8	34.68	13,476	470	34.69—34.77
Rust #2	9.16	3,985	1198	35.93
n-body
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #9	2.19	3,195	1881	1.61—3.97
* Rust #7	3.24	2,937	1759	3.24
Rust #3	3.46	3,023	1774	3.46
Rust #2	3.65	3,019	1809	3.65
* Rust #6	4.36	3,019	1796	4.10—5.43
* Rust #5	5.02	3,027	2224	5.02
Rust #4	5.13	3,019	1810	4.83—6.12
* Swift #3	5.46	25,002	1688	5.45—5.53
* Swift #4	5.49	25,010	1361	5.49
* Swift #5	5.52	25,010	1372	5.51—5.54
* Swift #7	5.53	25,010	1333	5.52
Rust	5.52	3,019	1483	5.56—5.66
Swift #6	5.81	12,947	1213	5.79—5.86
Swift #8	6.66	12,808	1285	6.66
Swift	7.89	12,808	1210	7.88
Swift #9	287.49	24,867	1532	287.52—287.99
spectral-norm
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #6	0.72	4,293	1132	2.85
Rust #4	0.72	4,014	823	2.85
* Rust #5	0.72	3,981	1062	2.85
* Rust	0.72	4,276	1262	2.86
* Rust #2	0.73	4,264	1117	2.86
* Rust #3	0.74	4,010	1060	2.94
Swift #8	5.36	24,936	411	5.35
Swift #3	1.45	13,705	607	5.71
* Rust #7		Empty
mandelbrot
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #4	0.95	35,955	1301	3.78
* Rust #6	1.08	36,385	1338	4.22
Rust #2	1.10	36,016	770	4.34
Rust #5	1.12	36,549	725	4.38
Rust #7	1.11	35,934	763	4.38
Rust #3	1.15	14,008	1013	4.57
* Swift #7	1.35	57,856	1147	5.30
* Swift #6	1.48	60,969	1147	5.78
Rust	2.03	42,541	874	7.90
Swift #8	25.63	12,841	426	25.62
Swift	26.55	12,853	400	26.54
Swift #5	7.28	49,291	665	27.12
* Swift #3		Bad Output
fasta
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust #7	0.78	4,866	2533	1.55
Rust #3	1.98	2,933	1235	1.98
Rust #9	0.94	5,362	1952	3.22—3.29
Rust #5	0.94	5,505	1963	3.34—3.43
Rust #2	0.94	5,550	1910	3.45—3.49
Rust #6	3.48	128,033	959	3.48
Rust #4	3.48	128,160	944	3.48
* Swift #2	2.24	13,767	1952	4.81—5.86
Rust	4.49	2,990	1240	4.51—4.55
* Swift #3	2.20	39,313	2097	5.37
* Swift	5.43	12,640	1533	5.43—5.46
Swift #8	18.86	12,837	828	18.86—18.91
k-nucleotide
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #7	2.61	139,071	1585	8.25—8.47
Rust #3	3.24	141,701	1549	9.49—9.79
Rust #6	2.81	165,057	1697	10.18—10.41
Rust #5	3.82	143,118	1745	11.26—11.52
Rust #2	6.05	143,139	1350	15.56—16.02
Rust #9	6.58	140,845	1850	17.43—18.35
Rust #4	6.76	142,778	1755	18.85—19.78
* Swift #2	14.46	273,932	1373	55.17—55.42
Rust	21.38	159,539	1086	65.42—66.28
Swift #8	167.99	904,810	658	176.45—187.83
Swift #7	225.53	649,970	607	232.57—241.98
Swift		Empty
reverse-complement
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* Rust	0.54	513,090	2762	0.85
Rust #2	0.99	1,022,960	1332	1.63
Rust #3	1.00	1,022,190	1105	1.73
* Swift	1.97	825,594	1293	2.41
binary-trees
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #5	1.10	137,413	771	3.96—4.09
Rust #2	1.21	141,509	729	4.32—4.37
Rust #4	1.38	171,651	765	5.04—5.11
Rust #3	1.40	162,599	762	5.05—5.11
Rust	2.07	137,667	760	7.21—7.27
Swift	18.32	763,609	720	54.27—54.37
Swift #8	54.91	416,625	567	54.99—57.09
Swift #4	17.69	733,131	772	55.74—57.55
Swift #5	18.99	764,781	813	56.24—57.93
Swift #2	18.36	733,131	822	58.70—64.46
Swift #3	18.24	733,000	868	58.66—59.10
* Swift #9		Empty
pidigits
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #4	0.72	3,994	804	0.72
* Rust	0.75	4,239	1426	0.75
* Rust #2	0.75	4,243	1312	0.75
* Rust #3	0.75	4,481	1373	0.75
* Swift #2	0.76	14,238	606	0.75
regex-redux
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
Rust #6	1.18	160,154	994	1.43
Rust #5	1.34	210,186	777	1.58
Rust	1.33	160,023	811	1.57—1.60
Rust #4	1.35	206,840	771	1.60
Rust #3	1.36	210,850	726	1.59—1.64
Rust #2	1.39	160,625	707	1.64
* Rust #7	0.79	155,496	2464	2.01
Swift #2	38.81	710,750	678	38.85—39.04
Swift	23.39	922,284	721	39.78—39.90
Swift #4	18.22	1,099,583	751	41.25—41.56
Rust	1.83.0 (90b35a623 2024-11-26) LLVM version: 19.1.1
Swift	Swift version 6.0 (swift-6.0-RELEASE) Target: x86_64-unknown-linux-gnu