Java versus C++ g++ 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	13.12
* C++ g++ #7	14.06	2,449	1156	14.04—14.11
C++ g++ #5	7.86	5,792	987	30.74—30.81
C++ g++ #4	8.91	5,710	1445	35.02—35.44
C++ g++ #2	9.14	5,698	1446	35.90—36.24
Java #3	38.64	61,968	1264	40.13—41.03
C++ g++ #3	37.89	2,351	600	37.91—37.98
C++ g++	10.53	5,534	1065	41.27—41.53
Java	10.87	62,976	1289	43.03—43.87
Java #8	44.98	60,264	517	46.66—52.75
Java #2	45.71	60,203	520	48.13—55.01
n-body
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #0	2.15	2,417	1933	2.16
* C++ g++ #7	4.09	5,124	1815	4.13—4.16
C++ g++ #9	5.15	2,486	1536	5.17
C++ g++ #3	5.33	2,482	1402	5.34
* C++ g++ #4	5.46	2,482	1434	5.46
* C++ g++ #2	6.02	2,490	1524	6.02—6.10
C++ g++ #5	6.33	2,478	1544	6.35
C++ g++	6.62	2,499	1666	6.64
Java #4	6.92	60,592	1495	6.93
C++ g++ #6	6.94	2,499	1674	6.94—6.97
Java #5	7.35	61,727	1435	7.40
Java #2	7.51	60,969	1430	7.53
Java #3	7.54	60,903	1436	7.55
Java #8	7.61	61,170	1322	7.63—7.75
Java	7.89	61,268	1437	7.91
spectral-norm
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #6	0.72	3,981	1050	2.86
* C++ g++ #5	1.33	5,820	1050	5.28
C++ g++	5.34	5,292	459	5.34
Java #8	5.48	62,124	453	5.52
Java #3	1.63	62,898	762	6.02
C++ g++ #7	1.53	4,071	1284	6.07
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	3.46
* C++ g++	0.90	37,626	1797	3.48
* C++ g++ #6	0.98	37,908	1014	3.87
C++ g++ #0	2.36	38,281	2752	9.31
* C++ g++ #7	4.87	38,048	749	13.30
C++ g++ #5	13.47	36,884	596	13.49
C++ g++ #9	3.53	37,863	732	13.59
Java #4	4.40	124,809	667	16.08—16.16
Java #2	4.13	100,966	802	16.25—16.45
Java #6	4.20	100,753	808	16.65—16.86
C++ g++ #2	16.96	36,704	700	16.96
Java	24.56	60,998	671	24.65—24.78
C++ g++ #3	27.38	5,181	421	27.38
Java #8	27.73	64,295	441	27.87—27.92
Java #3	7.10	101,376	910	32.70—36.60
fasta
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #9	0.78	6,214	2758	1.56
C++ g++ #2	1.85	5,108	1129	1.85
C++ g++	1.93	5,104	1064	1.93
C++ g++ #3	2.63	5,284	1311	2.63
C++ g++ #7	0.88	6,304	2711	3.06
C++ g++ #4	3.34	2,363	1291	3.34
Java #4	3.32	62,714	1528	3.42
C++ g++ #5	1.07	7,012	2345	3.69—3.73
Java #6	1.20	68,497	2549	3.73
C++ g++ #6	1.08	7,127	2326	3.90
Java #5	1.28	68,518	2478	4.11—4.21
Java #2	4.43	64,213	1259	4.66—4.73
Java #8	10.26	200,471	894	11.02—11.14
k-nucleotide
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #2	2.02	162,349	1634	6.08—6.51
C++ g++ #3	4.19	171,622	1280	13.87—14.40
C++ g++	7.04	778,510	1452	15.20—15.66
Java	5.08	396,227	1821	16.73—17.38
Java #6	7.32	389,710	1614	25.54—26.50
Java #3	7.38	440,680	1642	25.45—26.09
Java #4	34.62	218,296	1887	35.14—36.03
Java #5	20.66	248,066	2225	45.27—46.83
Java #8	80.82	1,195,364	786	84.30—87.87
reverse-complement
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
* C++ g++ #2	0.76	514,101	2099	0.76
Java #6	3.22	2,103,075	760	3.88
Java #5	4.81	1,143,542	1115	4.94—5.03
Java #4	5.81	1,956,385	656	5.94
C++ g++	6.55	1,006,805	599	6.55—6.67
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	3.47—3.61
C++ g++ #5	1.17	208,171	891	4.13—4.16
C++ g++ #9	1.76	140,571	815	4.67—4.81
C++ g++ #6	1.93	273,973	851	4.91—5.08
C++ g++ #3	2.28	273,715	951	5.06—5.10
C++ g++ #4	2.22	273,977	826	5.21—5.32
Java #4	4.50	1,774,043	846	5.65—5.96
Java #6	4.91	1,700,258	535	5.69—5.77
Java #3	4.89	1,627,595	546	5.71—5.82
Java #2	5.12	1,663,476	558	5.93—5.99
Java #8	6.53	1,673,216	596	7.30—7.39
Java #7	2.63	1,786,659	841	8.14—8.22
C++ g++	2.69	1,896,727	760	9.44—9.51
C++ g++ #2	22.77	274,080	514	22.83—23.04
pidigits
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #4	0.72	6,496	521	0.72
* C++ g++ #5	0.73	6,300	804	0.73
* Java #3	0.84	60,449	770	0.85
* Java #2	1.33	64,856	944	1.39
Java	7.72	423,014	807	8.77—8.80
regex-redux
	elapsed			Mean or 95% CI
source	secs	mem	gz	cpu secs
C++ g++ #6	1.14	285,639	2856	2.25
Java	8.49	533,643	875	16.77—16.97
Java #3	5.30	652,009	935	17.10—17.22
Java #6	5.67	1,285,243	746	17.18—17.43
C++ g++ #3	12.37	222,614	859	18.07—18.64
C++ g++		Empty
Java #2		Bad Output
C++ g++ #2		Empty
C++ g++ #5		Empty
C++ g++ #4		Empty
Java	java 23 2024-09-17 Java HotSpot(TM) 64-Bit Server VM (build 23+37-2369, mixed mode, sharing)
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0