C++ g++ versus C gcc

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++ g++ #6	3.33	13.12	5,800	1535	4.64
* C++ g++ #7	14.06	14.04—14.11	2,449	1156	2.95
* 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++ g++ #5	7.86	30.73—30.82	5,792	987	3.67
C++ g++ #4	8.91	34.99—35.47	5,710	1445	12.14
C++ g++ #2	9.14	35.88—36.26	5,698	1446	11.86
C gcc #3	36.84	36.84—36.89	2,343	574	2.19
C++ g++ #3	37.89	37.90—37.99	2,351	600	2.70
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
C++ g++	10.53	41.25—41.55	5,534	1065	3.88
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++ g++ #0	2.15	2.16	2,417	1933	3.66
* C gcc #4	4.06	4.06	2,499	1398	2.98
* C++ g++ #7	4.09	4.12—4.17	5,124	1815	4.18
C gcc #6	4.98	4.99	2,482	1186	2.33
C++ g++ #9	5.15	5.17	2,486	1536	3.03
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++ g++ #3	5.33	5.34	2,482	1402	2.85
* C gcc #5	5.44	5.44	2,494	1436	2.31
* C++ g++ #4	5.46	5.46	2,482	1434	2.83
C gcc #8	5.54	5.54	2,486	1195	2.52
C++ g++ #2	6.02	6.02—6.10	2,490	1524	3.04
C++ g++ #5	6.33	6.35	2,478	1544	2.92
C++ g++	6.62	6.64	2,499	1666	3.15
C gcc #7	6.89	6.90	2,490	1250	2.32
C++ g++ #6	6.94	6.93—6.98	2,499	1674	2.98
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
* C++ g++ #6	0.72	2.86	3,981	1050	3.08
* C++ g++ #5	1.33	5.28	5,820	1050	2.86
C++ g++	5.34	5.34	5,292	459	3.75
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++ g++ #7	1.53	6.07	4,071	1284	2.71
* C gcc #2		Empty
mandelbrot
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C++ g++ #4	0.89	3.46	37,941	3554	5.04
* C++ g++	0.90	3.48	37,626	1797	3.59
* C++ g++ #6	0.98	3.87	37,908	1014	4.36
* 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++ g++ #0	2.36	9.31	38,281	2752	4.60
C++ g++ #7	4.87	13.30	38,048	749	3.03
C++ g++ #5	13.47	13.49	36,884	596	2.76
C++ g++ #9	3.53	13.59	37,863	732	3.03
* 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
C++ g++ #2	16.96	16.96	36,704	700	3.28
C gcc #8	25.17	25.18	2,355	412	2.29
C++ g++ #3	27.38	27.38	5,181	421	3.69
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
* C++ g++ #9	0.78	1.56	6,214	2758	6.43
C++ g++ #2	1.85	1.85	5,108	1129	2.89
C++ g++	1.93	1.93	5,104	1064	2.98
C++ g++ #3	2.63	2.63	5,284	1311	3.33
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++ g++ #7	0.88	3.06	6,304	2711	4.58
C gcc #7	0.83	3.28	4,514	2276	2.39
C++ g++ #4	3.34	3.34	2,363	1291	3.03
C++ g++ #5	1.07	3.69—3.73	7,012	2345	3.90
C gcc	3.71	3.71	2,421	1213	2.25
C++ g++ #6	1.08	3.90	7,127	2326	3.72
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++ g++ #2	2.02	6.05—6.54	162,349	1634	7.41
C gcc	3.58	12.06—12.40	135,234	1512	2.82
C++ g++ #3	4.19	13.83—14.44	171,622	1280	5.17
C++ g++	7.04	15.17—15.69	778,510	1452	6.55
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++ g++ #2	0.76	0.76	514,101	2099	4.30
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
C++ g++	6.55	6.55—6.68	1,006,805	599	3.43
C++ g++ #5	37.66	37.65—37.69	792,846	704	3.40
C++ g++ #6		Bad Output
C++ g++ #3		Bad Output
binary-trees [ Contentious. Different approaches. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C++ g++ #7	1.01	3.46—3.62	175,108	896	7.50
C++ g++ #5	1.17	4.12—4.17	208,171	891	3.87
C gcc #2	1.56	4.30—4.45	174,780	816	3.21
C++ g++ #9	1.76	4.66—4.82	140,571	815	4.05
C gcc #3	1.96	4.79—4.93	138,711	842	2.94
C++ g++ #6	1.93	4.90—5.09	273,973	851	4.98
C++ g++ #3	2.28	5.06—5.10	273,715	951	4.79
C++ g++ #4	2.22	5.20—5.33	273,977	826	5.16
C++ g++	2.69	9.43—9.52	1,896,727	760	5.34
C gcc	21.21	21.39—21.70	272,065	660	2.37
C++ g++ #2	22.77	22.81—23.05	274,080	514	3.52
C gcc #5	8.71	31.85—32.27	361,587	914	2.34
pidigits [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C++ g++ #4	0.72	0.72	6,496	521	3.45
* C++ g++ #5	0.73	0.73	6,300	804	3.34
C gcc #2	0.74	0.74	4,006	422	2.25
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
C++ g++ #6	1.14	2.25	285,639	2856	5.06
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++ g++ #3	12.37	18.03—18.68	222,614	859	12.29
C++ g++		Empty
C++ g++ #2		Empty
C++ g++ #5		Empty
C++ g++ #4		Empty
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0