C clang versus Julia

How the programs are written matters! Always look at the source code.

If the fastest programs are flagged * possible hand-written vector instructions or "unsafe" or naked ffi, 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	cpu secs	mem	gz	make
* C clang #6	2.25	8.88	2,933	1582	5.56
* C clang #4	13.39	13.39	2,343	1190	5.32
C clang #5	8.10	32.01—32.15	4,792	917	5.61
* Julia #2	8.60	31.98—32.02	333,173	1077	0.11
* C clang #2	8.68	34.14—34.46	2,703	1563	5.59
C clang #3	34.14	34.19—34.26	2,351	574	5.16
* Julia #3	9.44	35.58—35.64	333,042	896	0.14
C clang #8	36.35	36.38—36.47	2,347	483	5.08
C clang	36.52	36.54—36.63	2,347	514	5.39
Julia	42.57	42.62	309,928	441	0.13
n-body
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C clang #9	2.20	2.20	2,494	1639	6.10
Julia #5	3.80	3.83—4.13	345,874	1129	0.14
* C clang #5	4.86	4.86	2,417	1436	5.03
C clang #6	5.17	5.17	2,970	1186	5.19
C clang	5.38	5.40	2,974	1179	5.35
C clang #2	5.43	5.44	2,982	1270	5.30
* C clang #4	5.60	5.61	2,941	1398	6.20
C clang #8	5.70	5.70—5.75	2,941	1195	5.20
C clang #3	6.13	6.13	2,978	1214	5.65
C clang #7	6.78	6.79	2,974	1250	5.16
Julia #4	7.19	7.26	414,929	1168	0.15
Julia #3	8.07	8.11—8.17	415,089	1548	0.13
Julia #2	28.68	28.88—29.15	414,970	1084	0.11
spectral-norm
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C clang #6	0.39	1.52—1.56	4,706	1203	6.40
* C clang #5	0.73	2.87	5,206	576	5.85
* C clang #4	0.73	2.88—2.92	5,366	1145	5.86
* C clang #2	0.73	4.15—6.50	5,411	941	6.35
Julia #4	1.31	3.73	315,896	435	0.09
C clang #8	5.41	5.42	3,211	389	5.20
C clang #3	1.45	5.74	5,390	470	5.53
Julia #2	2.84	5.81—5.85	414,818	377	0.14
* C clang #7	1.85	8.31—9.99	5,399	906	6.27
mandelbrot
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Julia #7	1.54	4.86	357,138	629	0.12
C clang #9	1.23	4.91	36,614	700	5.36
Julia #2	1.57	4.96	355,762	634	0.10
Julia #3	1.61	5.18	376,463	589	0.11
Julia #4	2.07	5.19	368,173	583	0.14
Julia #5	1.76	5.85	381,813	580	0.12
Julia #6	2.25	5.89	368,599	571	0.13
C clang #5	1.54	6.10	36,893	788	5.17
* C clang #4	3.49	13.85—13.93	36,458	805	5.13
* C clang	3.50	13.95	35,627	828	5.30
* C clang #7	3.53	14.02	36,758	1000	5.70
* C clang #3	3.56	14.16—14.22	35,484	769	5.23
C clang #8	25.48	25.50—25.55	2,359	412	5.04
Julia	26.66	26.71	339,132	379	0.11
* C clang #6		Empty
fasta
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C clang #3	0.78	0.78	2,257	1469	5.10
C clang #5	1.20	1.20	2,208	1286	5.41
Julia #2	1.28	1.32	318,083	1094	0.11
C clang #2	2.44	2.44	2,200	1299	5.46
Julia #5	2.68	2.72	334,770	957	0.10
Julia #4	2.73	2.77	320,528	1053	0.13
C clang #6	1.05	3.05	5,104	1936	5.36
C clang #7	0.83	3.28—3.32	5,947	2276	5.40
C clang	3.47	3.47	2,396	1213	5.07
* Julia #7	1.98	4.93—5.22	403,165	1189	0.12
* Julia #6	2.26	4.77—4.97	415,330	1213	0.13
C clang #8	8.09	8.19—8.30	2,200	839	4.95
Julia #3	11.71	11.76—11.82	318,497	901	0.13
C clang #4		Empty
k-nucleotide
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C clang	6.34	13.99—14.10	134,189	1512	5.85
Julia #6	6.98	14.54—14.97	524,595	965	0.12
Julia #7	9.93	23.91—24.31	575,861	1379	0.07
Julia	132.79	134.30—135.03	1,696,670	703	0.10
reverse-complement
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C clang #7	0.46	0.65	514,040	1899	6.27
C clang #9	0.48	0.72	514,277	1551	5.42
C clang #2	1.19	1.72	1,021,899	757	5.27
Julia #7	1.79	1.87	1,128,022	531	0.13
C clang #5	2.01	2.07—2.12	1,020,629	654	5.18
Julia #9	2.12	2.20	1,330,082	456	0.11
* C clang #4	3.79	3.80	514,073	716	5.07
C clang #6	1.08	4.26—4.30	699,249	828	5.14
Julia #2	29.48	29.90—30.70	2,259,153	464	0.12
binary-trees [ Contentious. Different approaches. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C clang #2	1.68	5.26—6.08	176,222	816	2.58
C clang #3	1.92	5.90	138,723	842	5.80
Julia #2	12.65	13.47—14.55	552,669	430	0.13
Julia #4	14.42	15.81—15.94	550,064	378	0.08
C clang	17.86	17.75—18.31	271,938	660	5.22
Julia #3	7.40	19.30—20.35	564,216	640	0.14
C clang #5	9.24	33.44—33.54	361,550	914	5.00
Julia #5	21.83	61.11—62.09	1,336,107	396	0.13
pidigits [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C clang #2	0.74	0.74	3,990	422	5.46
C clang	0.75	0.75	3,719	459	5.06
* Julia #3	1.14	1.24	307,749	512	0.10
* Julia #2	1.25	1.31	315,859	686	0.15
Julia #4	3.80	3.88—3.92	414,781	531	0.14
regex-redux [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C clang #5	0.84	2.84	159,756	1403	5.28
* Julia #5	1.91	3.19	519,877	766	0.16
C clang #2	3.23	3.23	106,799	1121	5.07
* Julia #4	2.00	3.29	522,019	772	0.15
* Julia #3	2.19	3.54—3.76	671,166	630	0.12
C clang #4	1.00	3.84—3.89	159,789	1237	5.30
C clang #3	1.76	4.33—4.37	109,871	1273	5.44
Julia	5.19	5.26—5.31	714,248	414	0.11
C clang	Ubuntu clang version 19.1.1 (1ubuntu1)
Julia	julia version 1.11.1