C gcc versus Ada 2012 GNAT

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
Ada 2012 GNAT #3	9.15	36.43	7,684	2120	3.95
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
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
* 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
Ada 2012 GNAT #3	5.88	5.89	5,972	1758	3.95
C gcc #7	6.89	6.90	2,490	1250	2.32
Ada 2012 GNAT	7.65	7.65	5,984	1624	3.91
* Ada 2012 GNAT #5	9.01	9.00—9.06	5,960	2452	3.55
* Ada 2012 GNAT #2	10.15	10.16	5,984	2623	3.59
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
* 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
* Ada 2012 GNAT #4	0.77	2.98	8,569	2777	4.55
Ada 2012 GNAT	5.35	5.34	6,091	725	3.63
C gcc #8	5.41	5.41	3,219	389	2.42
C gcc #3	1.43	5.71	4,080	470	2.42
Ada 2012 GNAT #3	1.49	5.73	8,475	1725	4.32
* 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
* 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
Ada 2012 GNAT #3	4.01	15.80	41,099	1825	3.53
C gcc #8	25.17	25.18	2,355	412	2.29
Ada 2012 GNAT #2	28.46	28.46	5,816	583	3.12
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
Ada 2012 GNAT #5	2.61	2.61	6,152	2220	3.71
Ada 2012 GNAT #2	2.65	2.65	6,148	2158	3.94
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
Ada 2012 GNAT	7.06	7.11—7.20	5,960	1381	3.49
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
Ada 2012 GNAT #2	7.82	16.65—17.27	269,390	4911	6.08
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
* C gcc #4	3.70	3.71	514,077	716	2.22
Ada 2012 GNAT #2	3.02	3.86	845,664	3285	4.21
Ada 2012 GNAT	14.15	14.28—14.46	543,805	943	3.13
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
Ada 2012 GNAT #4	4.16	12.01—12.09	210,969	2117	4.17
C gcc	21.21	21.39—21.70	272,065	660	2.37
Ada 2012 GNAT	23.45	23.60—23.74	275,038	896	3.48
C gcc #5	8.71	31.85—32.27	361,587	914	2.34
Ada 2012 GNAT #3	11.26	37.23—37.38	545,702	1275	3.64
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
* Ada 2012 GNAT #2	0.75	0.74	7,373	1137	2.86
C gcc	0.75	0.75	3,727	459	2.30
* Ada 2012 GNAT	4.49	4.49	7,631	1163	3.15
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
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
Ada 2012 GNAT #5	5.73	16.54—17.50	162,357	3647	6.32
Ada 2012 GNAT #6		Bad Output
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Ada 2012 GNAT	GNATMAKE 13.3.0