C gcc versus Free Pascal

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
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
Free Pascal	10.66	42.37	3,666	1057	1.12
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
Free Pascal #2	6.31	6.32	586	1345	0.95
Free Pascal	6.32	6.32	582	1331	0.91
C gcc #7	6.89	6.90	2,490	1250	2.32
Free Pascal #3	7.20	7.20	590	1441	0.96
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 gcc #8	5.41	5.41	3,219	389	2.42
C gcc #3	1.43	5.71	4,080	470	2.42
Free Pascal #3	1.46	5.72	3,879	656	1.29
Free Pascal #2	1.46	5.72	3,793	548	1.29
Free Pascal	11.81	11.82	532	429	0.69
* 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
Free Pascal #5	3.91	15.53	35,529	980	1.27
C gcc #9	4.07	15.72	35,394	700	2.47
C gcc #8	25.17	25.18	2,355	412	2.29
Free Pascal #7	6.61	26.28—26.50	39,596	956	1.63
Free Pascal #3	26.61	26.61	319	533	0.75
Free Pascal	11.06	29.64	35,152	853	1.06
Free Pascal #2	11.07	29.63	35,160	853	1.28
Free Pascal #6	7.47	29.88—30.07	38,654	809	1.51
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 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
Free Pascal #6	5.62	5.62	324	1196	0.75
Free Pascal #5	5.67	5.67	324	1225	0.72
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 gcc	3.58	12.06—12.40	135,234	1512	2.82
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
Free Pascal #2	3.83	3.84	538,989	773	0.72
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
Free Pascal #5	2.12	5.06	136,892	959	1.46
Free Pascal #6	2.12	5.06	136,897	967	1.49
Free Pascal #7	2.17	5.16	136,897	1010	1.49
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
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
* Free Pascal #3	0.75	0.74	3,195	536	1.18
C gcc	0.75	0.75	3,727	459	2.30
* Free Pascal #2	4.49	4.49	3,437	834	0.88
Free Pascal	14.70	14.71	1,303	3068	0.75
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
Free Pascal	5.56	5.55	106,508	1313	1.17
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Free Pascal	Free Pascal Compiler version 3.2.2 [2021/05/16]