Swift 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
source	secs	mem	gz	cpu secs
Rust #6	3.88	19,804	1260	15.27
Rust #4	6.93	19,804	1026	27.20
Rust #5	7.66	19,804	1023	29.90
Swift #3	8.32	19,440	1103	32.99
Swift #8	35.13	19,444	470	35.12
Rust #2	9.15	19,804	1198	35.90
n-body
source	secs	mem	gz	cpu secs
Rust #9	2.19	19,804	1881	2.19
Rust #7	3.25	19,804	1759	3.24
Rust #2	3.94	19,804	1809	3.94
Rust #6	4.30	19,804	1796	4.30
Rust #8	4.49	19,804	1774	4.49
Rust #5	5.01	19,804	2224	5.01
Rust #4	5.10	19,804	1810	5.10
Swift #3	5.43	19,440	1688	5.43
Swift #4	5.46	19,440	1361	5.46
Swift #5	5.49	19,440	1372	5.49
Swift #7	5.50	19,440	1333	5.50
Rust	5.51	19,804	1483	5.51
Rust #3	5.57	19,804	1546	5.57
Swift #6	5.78	19,440	1213	5.78
Swift #8	6.65	19,440	1285	6.65
Swift	7.85	19,440	1210	7.85
Swift #9	288.23	19,440	1532	288.20
spectral-norm
source	secs	mem	gz	cpu secs
Rust #6	0.72	19,804	1132	2.85
Rust #4	0.72	19,804	823	2.85
Rust #5	0.72	19,804	1062	2.85
Rust #2	0.78	19,804	1117	2.98
Rust	0.77	19,804	1262	2.99
Rust #3	0.78	19,804	1060	3.00
Swift #8	5.33	19,568	411	5.33
Swift #3	1.43	19,440	607	5.69
Rust #7		Make Error
mandelbrot
source	secs	mem	gz	cpu secs
Rust #4	0.94	33,408	1301	3.73
Rust #8	1.06	33,408	770	4.22
Rust #6	1.08	34,048	1338	4.23
Rust #7	1.06	33,408	763	4.23
Rust #5	1.13	34,048	725	4.43
Rust #3	1.14	19,860	1013	4.54
Swift #7	1.38	49,024	1147	5.49
Swift #6	1.46	51,840	1147	5.78
Rust	2.00	39,296	874	7.84
Swift	26.45	19,440	400	26.45
Swift #5	7.25	43,648	665	27.03
Swift #3		Bad Output
pidigits
source	secs	mem	gz	cpu secs
Rust #4	0.71	19,804	804	0.71
Rust #3	0.74	19,804	1373	0.74
Rust	0.74	19,804	1426	0.74
Rust #2	0.74	19,804	1312	0.74
Swift #2	0.75	19,440	606	0.75
regex-redux
source	secs	mem	gz	cpu secs
Rust #6	1.18	154,096	994	1.44
Rust	1.33	153,792	811	1.58
Rust #5	1.34	203,224	777	1.58
Rust #2	1.34	153,776	707	1.60
Rust #4	1.35	199,548	771	1.61
Rust #3	1.36	202,908	726	1.61
Rust #7	0.78	149,888	2464	1.99
Swift #2	38.80	686,136	678	38.80
Swift	23.40	891,792	721	39.65
Swift #4	18.30	1,064,768	751	41.36
fasta
source	secs	mem	gz	cpu secs
Rust #7	0.77	19,804	2533	1.54
Rust #3	1.98	19,804	1235	1.97
Rust #2	0.92	19,932	1910	3.09
Rust #8	0.93	19,804	1952	3.14
Rust #5	0.94	19,932	1963	3.14
Rust #6	3.46	123,652	959	3.45
Rust #4	3.57	123,652	944	3.57
Swift #2	2.11	19,440	1952	3.76
Rust	4.24	19,804	1240	4.24
Swift	5.15	19,440	1533	5.14
Swift #3	2.18	31,248	2097	5.40
Swift #8	106.65	19,440	833	106.65
k-nucleotide
source	secs	mem	gz	cpu secs
Rust #7	2.84	133,840	1585	8.91
Rust #8	3.53	137,372	1549	10.47
Rust #6	2.96	159,600	1697	10.67
Rust #5	3.96	137,844	1745	11.95
Rust #2	6.28	138,736	1350	16.39
Rust #9	6.44	135,800	1850	17.00
Rust #4	6.74	137,440	1755	18.30
Swift #2	14.54	260,820	1373	55.20
Rust	22.54	157,124	1086	67.38
Swift		Make Error
reverse-complement
source	secs	mem	gz	cpu secs
Rust	0.53	498,816	2762	0.83
Rust #2	0.98	995,200	1332	1.62
Rust #3	0.98	995,200	1105	1.68
Swift	1.95	798,228	1293	2.39
binary-trees
source	secs	mem	gz	cpu secs
Rust #5	1.08	198,656	771	3.77
Rust #2	1.22	199,684	729	4.29
Rust #4	1.33	187,948	765	4.80
Rust #3	1.40	188,740	762	5.06
Rust	2.05	132,992	760	7.21
Swift	18.28	737,152	720	54.20
Swift #8	54.90	402,048	567	54.89
Swift #4	17.49	707,456	772	55.84
Swift #5	18.89	738,048	813	56.25
Swift #2	18.29	707,456	822	58.16
Swift #3	18.18	707,584	868	58.24
Swift #9		Make Error
Swift	Swift version 6.0 (swift-6.0-RELEASE) Target: x86_64-unknown-linux-gnu
Rust	1.80.1 (3f5fd8dd4 2024-08-06) LLVM version: 18.1.7