Swift versus Go 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
* Swift #3	8.32	19,440	1103	32.99
Go #3	8.34	19,808	975	33.31
Swift #8	35.13	19,444	470	35.12
Go #8	46.13	19,440	500	46.24
Go	12.29	19,808	906	49.04
Go #2	12.35	19,808	903	49.32
n-body
source	secs	mem	gz	cpu secs
* 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
Swift #6	5.78	19,440	1213	5.78
Go #3	6.38	19,808	1207	6.40
Swift #8	6.65	19,440	1285	6.65
Go	7.01	19,808	1316	7.03
Go #2	7.03	19,808	1222	7.05
Swift	7.85	19,440	1210	7.85
Go #8	9.60	19,436	1224	9.62
Swift #9	288.23	19,440	1532	288.20
spectral-norm
source	secs	mem	gz	cpu secs
Swift #8	5.33	19,568	411	5.33
Go #8	5.33	19,416	429	5.34
Go	5.33	19,808	417	5.34
Go #2	1.50	19,808	674	5.68
Go #4	1.45	19,808	555	5.69
Swift #3	1.43	19,440	607	5.69
mandelbrot
source	secs	mem	gz	cpu secs
* Swift #7	1.38	49,024	1147	5.49
* Swift #6	1.46	51,840	1147	5.78
Go #4	3.76	35,456	912	14.99
Go #3	3.77	35,456	900	15.00
Go	5.02	33,024	829	20.02
Swift #8	25.59	19,492	426	25.59
Swift	26.45	19,440	400	26.45
Go #8	26.68	19,440	500	26.74
Swift #5	7.25	43,648	665	27.03
Go #2	6.85	33,152	843	27.28
Go #6	6.89	33,024	707	27.44
* Swift #3		Bad Output
fasta
source	secs	mem	gz	cpu secs
Go	3.73	19,808	1055	3.74
* Swift #2	2.11	19,440	1952	3.76
Go #2	1.27	19,808	1405	4.06
Go #3	1.51	19,808	1362	4.09
* Swift	5.15	19,440	1533	5.14
* Swift #3	2.18	31,248	2097	5.40
Go #8	18.27	19,440	838	18.46
Swift #8	106.65	19,440	833	106.65
k-nucleotide
source	secs	mem	gz	cpu secs
Go #7	7.63	163,072	1613	28.79
Go #3	8.18	145,280	1729	29.88
Go #6	8.21	145,152	1596	30.01
Go #4	9.16	140,032	1552	31.38
* Swift #2	14.54	260,820	1373	55.20
Swift #8	181.50	627,328	658	180.87
Swift #7	233.16	627,092	607	232.52
Swift		Make Error
reverse-complement
source	secs	mem	gz	cpu secs
Go #2	2.19	800,640	614	2.29
* Swift	1.95	798,228	1293	2.39
Go #3	2.48	800,384	609	2.57
Go #6	1.91	1,244,508	1340	3.40
Go #5		Bad Output
Go		Failed
binary-trees
source	secs	mem	gz	cpu secs
Go #6	27.90	404,096	618	29.26
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
Go #2	14.17	624,780	672	56.29
Go #3	14.91	326,508	806	58.00
Go #5	14.87	425,960	957	58.15
Swift #2	18.29	707,456	822	58.16
Swift #3	18.18	707,584	868	58.24
Go	32.01	243,192	488	59.78
Go #7	32.52	248,604	531	61.47
* Swift #9		Make Error
pidigits
source	secs	mem	gz	cpu secs
* Swift #2	0.75	19,440	606	0.75
* Go #4	0.82	19,808	689	0.83
Go	1.18	19,808	715	1.20
* Go #3	1.40	19,808	610	1.44
Go #2	1.84	19,808	740	1.89
Go #6	2.46	19,512	727	2.46
Go #7	4.99	19,808	702	5.61
regex-redux
source	secs	mem	gz	cpu secs
Go #5	3.25	321,360	817	5.43
Go #4	14.61	369,008	832	35.91
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
Go	25.37	319,956	749	61.07
Go #3	25.62	371,204	836	61.79
Swift	Swift version 6.0 (swift-6.0-RELEASE) Target: x86_64-unknown-linux-gnu
Go	go version go1.23.1 linux/amd64 GOAMD64=v2