C gcc versus Intel Fortran

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 gcc #6	2.14	8.44	2,712	1582	2.68
* C gcc #4	14.05	14.06	2,351	1190	2.31
C gcc #5	7.28	28.32—28.45	2,949	917	2.17
C gcc #3	36.84	36.84—36.89	2,343	574	2.19
Intel Fortran #3	9.67	38.56	12,128	1164	5.02
C gcc #8	39.34	39.52—40.22	2,343	483	2.20
C gcc	39.65	39.64—40.07	2,343	514	2.12
* C gcc #2	10.18	39.98—40.15	2,695	1563	2.51
Intel Fortran	40.21	40.21	2,179	608	3.95
n-body
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #9	2.10	2.10	2,482	1639	2.99
Intel Fortran #5	3.39	3.40	2,146	1669	4.48
* C gcc #4	4.06	4.06	2,499	1398	2.98
Intel Fortran #2	4.46	4.42—4.69	2,146	1507	4.33
Intel Fortran	4.55	4.55	2,142	1400	4.41
Intel Fortran #3	4.72	4.69—4.82	2,154	1311	4.43
C gcc #6	4.98	4.99	2,482	1186	2.33
Intel Fortran #6	4.99	4.64—6.08	2,052	1530	4.43
C gcc #2	5.20	5.20	2,490	1270	2.43
C gcc	5.23	5.23	2,486	1179	2.58
C gcc #3	5.24	5.24	2,482	1214	2.42
* C gcc #5	5.44	5.44	2,494	1436	2.31
C gcc #8	5.54	5.54	2,486	1195	2.52
C gcc #7	6.89	6.90	2,490	1250	2.32
Intel Fortran #4		Bad Output
spectral-norm
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #6	0.40	1.60	3,199	1203	3.38
Intel Fortran #2	2.67	2.67	2,331	520	5.05
* C gcc #5	0.72	2.86	3,858	576	2.52
* C gcc #7	0.72	2.86	4,067	906	3.21
Intel Fortran #3	0.72	2.88—2.92	5,214	644	4.80
* C gcc #4	0.72	2.86	3,719	1145	2.49
C gcc #8	5.41	5.41	3,219	389	2.42
C gcc #3	1.43	5.71	4,080	470	2.42
* C gcc #2		Empty
mandelbrot
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #6	1.29	5.11	35,578	1147	2.64
C gcc #5	1.64	6.32	35,582	788	2.38
Intel Fortran #6	2.72	8.55	85,975	669	4.13
* C gcc #4	3.50	13.91	35,197	805	2.16
* C gcc #7	3.51	13.94	35,447	1000	2.60
* C gcc	3.50	13.94	35,017	828	2.23
* C gcc #3	3.55	14.12	34,873	769	2.26
C gcc #9	4.07	15.72	35,394	700	2.47
Intel Fortran #7	4.09	16.19	85,639	965	5.17
C gcc #8	25.17	25.18	2,355	412	2.29
Intel Fortran #4	9.89	25.29—25.33	86,360	626	3.95
Intel Fortran #5	32.66	32.67	47,174	528	3.72
fasta
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc #3	0.79	0.79	2,236	1469	2.26
C gcc #5	1.24	1.25	2,154	1286	2.42
Intel Fortran #4	1.36	1.37	2,142	1355	4.44
C gcc #2	2.77	2.77	2,204	1299	2.25
C gcc #6	0.95	2.77—2.81	3,748	1936	2.44
C gcc #7	0.83	3.28	4,514	2276	2.39
C gcc	3.71	3.71	2,421	1213	2.25
Intel Fortran	6.01	6.05—6.11	2,146	1193	4.34
Intel Fortran #3	6.53	6.57—6.65	2,142	1217	4.47
C gcc #8	8.27	8.31—8.37	2,195	839	2.20
C gcc #4		Empty
k-nucleotide
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc	3.58	12.06—12.40	135,234	1512	2.82
Intel Fortran		Empty
reverse-complement
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #7	0.44	0.62	514,208	1899	3.13
C gcc #9	0.49	0.78	514,159	1551	2.20
C gcc #6	0.97	1.37	693,969	828	2.26
C gcc #5	1.54	1.54	1,020,662	654	2.05
C gcc #2	1.07	1.59	1,021,755	757	2.15
Intel Fortran	3.35	3.36	1,012,519	1026	4.53
* C gcc #4	3.70	3.71	514,077	716	2.22
Intel Fortran #2	45.22	45.34—45.58	790,307	778	4.10
binary-trees [ Contentious. Different approaches. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc #2	1.56	4.30—4.45	174,780	816	3.21
C gcc #3	1.96	4.79—4.93	138,711	842	2.94
Intel Fortran #2	2.24	6.89—7.00	148,124	1155	4.32
C gcc	21.21	21.39—21.70	272,065	660	2.37
C gcc #5	8.71	31.85—32.27	361,587	914	2.34
Intel Fortran	32.74	32.78—32.88	540,066	780	3.98
pidigits [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc #2	0.74	0.74	4,006	422	2.25
Intel Fortran #4	0.74	0.74	6,590	987	3.94
C gcc	0.75	0.75	3,727	459	2.30
regex-redux [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc #5	0.81	2.05	157,463	1403	2.47
Intel Fortran	0.98	3.11—3.15	189,305	2229	4.80
C gcc #2	3.22	3.22	106,713	1121	2.14
C gcc #4	0.97	3.30	157,417	1237	2.18
C gcc #3	1.73	3.32	107,401	1273	2.27
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Intel Fortran	ifx (IFX) 2024.1.0 20240308