C++ g++ versus Java fastest performance

How the programs are written matters! Always look at the source code.

If the fastest programs are * hand-written vector instructions, 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	mem	gz	cpu secs
* C++ g++ #6	3.33	5,800	1535	13.117
* C++ g++ #7	14.06	2,449	1156	14.04—14.11
C++ g++ #5	7.86	5,792	987	30.73—30.82
C++ g++ #4	8.91	5,710	1445	34.99—35.47
C++ g++ #2	9.14	5,698	1446	35.88—36.26
Java #3	38.64	61,968	1264	40.07—41.09
C++ g++ #3	37.89	2,351	600	37.90—37.99
C++ g++	10.53	5,534	1065	41.25—41.55
Java	10.87	62,976	1289	42.97—43.93
Java #8	44.98	60,264	517	46.24—53.17
Java #2	45.71	60,203	520	47.65—55.48
n-body
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #0	2.15	2,417	1933	2.155
* C++ g++ #7	4.09	5,124	1815	4.12—4.17
C++ g++ #9	5.15	2,486	1536	5.169
C++ g++ #3	5.33	2,482	1402	5.336
* C++ g++ #4	5.46	2,482	1434	5.456
* C++ g++ #2	6.02	2,490	1524	6.02—6.10
C++ g++ #5	6.33	2,478	1544	6.345
C++ g++	6.62	2,499	1666	6.636
Java #4	6.92	60,592	1495	6.933
C++ g++ #6	6.94	2,499	1674	6.93—6.98
Java #5	7.35	61,727	1435	7.399
Java #2	7.51	60,969	1430	7.534
Java #3	7.54	60,903	1436	7.552
Java #8	7.61	61,170	1322	7.62—7.76
Java	7.89	61,268	1437	7.908
spectral-norm
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #6	0.72	3,981	1050	2.859
* C++ g++ #5	1.33	5,820	1050	5.284
C++ g++	5.34	5,292	459	5.341
Java	5.47	61,796	521	5.511
Java #8	5.48	62,124	453	5.515
Java #3	1.63	62,898	762	6.022
C++ g++ #7	1.53	4,071	1284	6.067
Java #2	1.65	62,132	956	6.18—6.22
mandelbrot
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #4	0.89	37,941	3554	3.464
* C++ g++	0.90	37,626	1797	3.479
* C++ g++ #6	0.98	37,908	1014	3.874
C++ g++ #0	2.36	38,281	2752	9.314
* C++ g++ #7	4.87	38,048	749	13.299
C++ g++ #5	13.47	36,884	596	13.493
C++ g++ #9	3.53	37,863	732	13.587
Java #4	4.40	124,809	667	16.08—16.16
Java #2	4.13	100,966	802	16.24—16.46
Java #6	4.20	100,753	808	16.63—16.88
C++ g++ #2	16.96	36,704	700	16.960
Java	24.56	60,998	671	24.64—24.79
C++ g++ #3	27.38	5,181	421	27.381
Java #8	27.73	64,295	441	27.87—27.93
Java #3	7.10	101,376	910	32.43—36.87
fasta
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #9	0.78	6,214	2758	1.558
C++ g++ #2	1.85	5,108	1129	1.849
C++ g++	1.93	5,104	1064	1.930
C++ g++ #3	2.63	5,284	1311	2.632
C++ g++ #7	0.88	6,304	2711	3.060
C++ g++ #4	3.34	2,363	1291	3.335
Java #4	3.32	62,714	1528	3.421
C++ g++ #5	1.07	7,012	2345	3.69—3.73
Java #6	1.20	68,497	2549	3.729
C++ g++ #6	1.08	7,127	2326	3.901
Java #5	1.28	68,518	2478	4.10—4.21
Java #2	4.43	64,213	1259	4.66—4.73
Java #8	10.26	200,471	894	11.01—11.15
k-nucleotide
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #2	2.02	162,349	1634	6.05—6.54
C++ g++ #3	4.19	171,622	1280	13.83—14.44
C++ g++	7.04	778,510	1452	15.17—15.69
Java	5.08	396,227	1821	16.68—17.43
Java #6	7.32	389,710	1614	25.47—26.57
Java #3	7.38	440,680	1642	25.41—26.13
Java #4	34.62	218,296	1887	35.08—36.10
Java #5	20.66	248,066	2225	45.16—46.94
Java #8	80.82	1,195,364	786	84.05—88.12
reverse-complement
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #2	0.76	514,101	2099	0.757
Java #6	3.22	2,103,075	760	3.880
Java #5	4.81	1,143,542	1115	4.93—5.03
Java #4	5.81	1,956,385	656	5.941
C++ g++	6.55	1,006,805	599	6.55—6.68
C++ g++ #5	37.66	792,846	704	37.65—37.69
Java #7		Bad Output
Java #3		Bad Output
C++ g++ #6		Bad Output
C++ g++ #3		Bad Output
binary-trees
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #7	1.01	175,108	896	3.46—3.62
C++ g++ #5	1.17	208,171	891	4.12—4.17
C++ g++ #9	1.76	140,571	815	4.66—4.82
C++ g++ #6	1.93	273,973	851	4.90—5.09
C++ g++ #3	2.28	273,715	951	5.06—5.10
C++ g++ #4	2.22	273,977	826	5.20—5.33
Java #4	4.50	1,774,043	846	5.62—5.98
Java #6	4.91	1,700,258	535	5.68—5.78
Java #3	4.89	1,627,595	546	5.70—5.83
Java #2	5.12	1,663,476	558	5.93—6.00
Java #8	6.53	1,673,216	596	7.29—7.40
Java #7	2.63	1,786,659	841	8.14—8.22
C++ g++	2.69	1,896,727	760	9.43—9.52
C++ g++ #2	22.77	274,080	514	22.81—23.05
pidigits
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #4	0.72	6,496	521	0.717
* C++ g++ #5	0.73	6,300	804	0.730
* Java #3	0.84	60,449	770	0.848
* Java #2	1.33	64,856	944	1.394
Java	7.72	423,014	807	8.76—8.81
regex-redux
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #6	1.14	285,639	2856	2.249
Java	8.49	533,643	875	16.76—16.99
Java #3	5.30	652,009	935	17.09—17.23
Java #6	5.67	1,285,243	746	17.16—17.45
C++ g++ #3	12.37	222,614	859	18.03—18.68
C++ g++		Empty
Java #2		Bad Output
C++ g++ #2		Empty
C++ g++ #5		Empty
C++ g++ #4		Empty
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0
Java	java 23 2024-09-17 Java HotSpot(TM) 64-Bit Server VM (build 23+37-2369, mixed mode, sharing)