C gcc versus Intel C

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
* Intel C #6	2.25	8.91	3,625	1582	4.46
* Intel C #4	13.39	13.39	2,830	1190	4.38
* 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
Intel C #5	7.77	30.80—30.95	5,378	917	4.46
* Intel C #2	8.70	34.11—34.19	3,457	1563	4.27
Intel C #3	34.59	34.60	2,896	574	4.16
C gcc #3	36.84	36.84—36.89	2,343	574	2.19
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 C #8	42.87	42.88—43.00	2,892	483	4.15
Intel C	43.45	43.42—43.59	2,896	514	4.22
n-body
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* Intel C #9	2.04	2.04	2,966	1639	5.24
* C gcc #9	2.10	2.10	2,482	1639	2.99
* Intel C #4	3.64	3.63—3.69	2,933	1398	5.29
* C gcc #4	4.06	4.06	2,499	1398	2.98
C gcc #6	4.98	4.99	2,482	1186	2.33
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
Intel C #7	5.55	5.54—5.58	2,961	1250	4.46
* Intel C #5	5.57	5.57	2,937	1436	4.23
Intel C #8	6.01	6.06—6.10	3,039	1195	4.42
Intel C #3	6.18	6.13—6.46	2,970	1214	4.42
Intel C #6	6.20	6.23	2,970	1186	4.50
Intel C	6.24	6.26	2,970	1179	4.46
Intel C #2	6.24	6.23—6.39	2,966	1270	4.30
C gcc #7	6.89	6.90	2,490	1250	2.32
spectral-norm
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* Intel C #6	0.40	1.54—1.58	5,321	1203	5.45
* C gcc #6	0.40	1.60	3,199	1203	3.38
Intel C #8	2.67	2.68	3,215	389	4.71
* C gcc #5	0.72	2.86	3,858	576	2.52
* C gcc #7	0.72	2.86	4,067	906	3.21
* C gcc #4	0.72	2.86	3,719	1145	2.49
* Intel C #7	0.73	2.87	5,439	906	5.57
Intel C #3	0.73	2.87—2.92	5,399	470	4.60
* Intel C #4	0.73	2.88	5,382	1145	4.79
* Intel C #5	0.73	2.89	5,464	576	4.76
C gcc #8	5.41	5.41	3,219	389	2.42
C gcc #3	1.43	5.71	4,080	470	2.42
* Intel C #2		Empty
* 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 C #9	1.83	7.27	36,909	700	4.32
* Intel C #7	3.14	12.40	37,278	1000	4.62
* Intel C #4	3.22	12.81—12.87	36,958	805	4.24
* Intel C	3.26	12.99	35,803	828	4.36
* Intel C #3	3.32	13.23	35,529	769	4.37
* 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 C #8	23.98	23.98	2,839	412	4.38
C gcc #8	25.17	25.18	2,355	412	2.29
Intel C #5		Bad Output
* Intel C #6		Empty
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
Intel C #3	0.84	0.83	2,793	1469	4.71
Intel C #5	1.06	1.06	2,937	1286	4.44
C gcc #5	1.24	1.25	2,154	1286	2.42
Intel C #2	1.44	1.44	2,773	1299	4.29
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
Intel C	2.93	2.93	2,945	1213	4.41
Intel C #7	0.83	3.28	6,611	2276	4.52
C gcc #7	0.83	3.28	4,514	2276	2.39
C gcc	3.71	3.71	2,421	1213	2.25
Intel C #8	7.86	7.90—7.98	2,679	839	4.23
C gcc #8	8.27	8.31—8.37	2,195	839	2.20
Intel C #4		Empty
Intel C #6		Timed Out
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 C	6.12	13.40—13.51	134,566	1512	4.77
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
* Intel C #7	0.45	0.64	514,732	1899	5.28
Intel C #9	0.48	0.74	514,642	1551	4.34
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 C #2	1.17	1.70	1,022,149	757	4.32
Intel C #5	2.14	2.14	1,021,334	654	4.55
* C gcc #4	3.70	3.71	514,077	716	2.22
* Intel C #4	3.76	3.79	514,626	716	4.22
Intel C #6	1.08	4.25—4.29	750,670	828	4.27
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 C #2	1.71	5.41	176,718	816	4.92
Intel C #3	2.04	6.23	139,166	842	5.57
Intel C	17.90	17.93—18.09	271,843	660	4.31
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 C #5	9.21	33.41—33.58	362,066	914	4.15
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 C #2	0.74	0.74	4,506	422	4.39
Intel C	0.75	0.74	4,448	459	4.39
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 C #5	0.90	2.89—2.93	160,592	1403	4.64
C gcc #2	3.22	3.22	106,713	1121	2.14
Intel C #2	3.22	3.22	107,491	1121	4.35
C gcc #4	0.97	3.30	157,417	1237	2.18
C gcc #3	1.73	3.32	107,401	1273	2.27
Intel C #4	1.06	4.08—4.13	160,281	1237	4.44
Intel C #3	1.84	4.43	110,412	1273	4.70
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Intel C	Intel(R) oneAPI DPC++/C++ Compiler 2024.1.0.20240308