Python 3 versus Java

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
Java #3	40.02	40.12—40.21	62,652	1264	1.69
Java	10.48	42.17—43.29	62,661	1289	1.73
Java #2	45.41	45.13—51.49	60,027	520	1.68
Java #8	46.66	49.88—55.68	59,994	517	1.65
Python 3 #6	943.88	942.63	11,874	391	3.58
Python 3 #4	311.18	1,221.85	28,701	960	5.27
Python 3 #8	2,457.09	2,455.59	11,874	414	5.65
n-body
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java #4	6.92	6.94	60,592	1495	1.65
Java #5	7.34	7.39	61,669	1435	1.78
Java #2	7.51	7.53	60,846	1430	1.71
Java #3	7.52	7.54	61,186	1436	1.65
Java #8	7.61	7.66	60,953	1322	1.67
Java	7.89	7.91	61,276	1437	1.70
Python 3	372.41	371.23	12,198	1201	5.23
Python 3 #2	442.06	440.87	12,554	1247	5.24
Python 3 #8	529.38	528.16	12,497	1172	4.94
spectral-norm
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java	5.47	5.51	61,817	521	1.51
Java #8	5.47	5.51	62,308	453	1.72
Java #3	1.61	6.01	62,812	762	1.68
Java #2	1.65	6.16—6.20	61,784	956	2.76
Python 3 #6	349.68	348.48	13,660	334	5.44
Python 3 #4	90.37	352.91	34,693	415	5.41
Python 3 #8	386.45	385.07	12,833	334	5.08
Python 3 #7	109.91	421.84	34,578	425	5.30
mandelbrot
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java #2	4.16	16.30—16.44	101,253	802	1.72
Java #4	4.44	16.15—16.21	124,953	667	1.66
Java #6	4.21	16.67—17.00	100,794	808	1.78
Java	24.54	24.65—24.78	60,711	671	1.81
Java #8	27.72	27.85—27.91	63,836	441	1.74
Java #3	7.11	28.81—34.50	101,401	910	1.91
Python 3 #7	182.94	723.28	62,173	698	5.52
Python 3 #3	879.41	877.96	45,085	319	5.26
Python 3 #2	237.64	937.87	230,973	790	5.42
Python 3 #5	260.63	1,033.16	61,620	463	5.48
Python 3 #8	1,577.29	1,575.80	45,031	379	4.84
fasta
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java #4	3.32	3.42	62,726	1528	1.74
Java #6	1.20	3.73	68,055	2549	1.91
Java #5	1.27	3.95—4.17	68,420	2478	1.86
Java #2	4.41	4.64—4.73	65,995	1259	1.75
Java #8	10.27	10.94—11.09	202,166	894	1.99
Python 3 #3	39.03	38.30—47.80	12,218	1007	5.32
Python 3 #2	39.06	38.61—46.82	12,415	1126	5.21
Python 3 #5	27.95	54.20—54.96	1,190,347	1951	5.52
Python 3	57.39	56.94—65.76	12,100	823	5.06
Python 3 #8	153.17	153.78—158.43	11,915	738	5.04
k-nucleotide
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java	4.94	16.37—17.19	459,260	1821	2.19
Java #3	7.25	25.39—25.58	389,857	1642	2.01
Java #6	7.27	25.30—26.29	389,628	1614	2.19
Java #4	34.38	34.66—36.43	218,042	1887	2.05
Java #5	20.48	44.95—46.24	243,007	2225	2.12
Java #8	79.72	83.79—87.16	1,484,460	786	2.09
Python 3 #3	46.55	182.32—187.37	674,185	1970	5.68
Python 3 #4	76.67	233.00—239.32	523,751	663	4.89
Python 3 #8	234.08	235.36—236.89	642,265	525	5.15
Python 3	234.20	235.10—237.16	515,047	499	5.34
Python 3 #9	66.67	236.43—238.45	392,184	614	4.09
reverse-complement
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java #6	3.20	3.84	2,103,058	760	1.69
Python 3 #3	4.96	4.95	523,801	803	5.28
Java #5	4.81	4.93—5.10	1,143,575	1115	1.66
Java #4	5.73	5.87—5.94	1,958,097	656	1.58
Python 3 #5	4.18	7.46—7.50	2,418,156	960	5.36
Python 3 #2	10.09	10.13—10.24	1,837,285	440	5.32
Python 3	10.43	10.43—10.59	2,040,713	484	5.28
Python 3 #6	7.59	11.07—11.11	2,795,930	821	5.37
Python 3 #4	13.47	13.44—13.88	4,109,324	343	5.05
Java #7		Bad Output
Java #3		Bad Output
binary-trees [ Contentious. Different approaches. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Java #4	4.45	5.56—5.91	1,804,603	846	2.63
Java #6	4.91	5.73—5.77	1,792,643	535	1.59
Java #3	4.92	5.73—5.85	1,733,562	546	1.55
Java #2	5.05	5.84—5.91	1,792,967	558	1.78
Java #7	2.62	8.09—8.18	1,778,696	841	1.88
Python 3 #2	100.49	100.69—101.09	281,829	344	5.08
Python 3 #4	33.37	121.32—121.68	460,771	481	5.57
Python 3	34.85	123.08—123.98	445,649	597	5.16
Python 3 #5	35.37	125.71—126.12	806,117	669	5.30
Python 3 #3	51.88	148.91—149.87	819,077	1247	5.39
pidigits [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* Java #3	0.84	0.86	60,424	770	1.73
Java #4	1.05	1.27	78,606	733	3.62
* Python 3 #3	1.35	1.28—1.32	20,009	573	5.34
* Java #2	1.34	1.41	65,090	944	1.71
Python 3 #4	4.63	4.60	12,718	348	4.88
Java	7.72	8.78—8.83	453,767	807	1.56
Python 3 #5		Empty
regex-redux [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* Python 3 #2	1.41	2.65	191,300	1411	5.48
Java #2	1.60	3.19	386,425	2201	3.75
Python 3	8.96	16.47—16.75	459,624	515	5.47
Java	8.45	16.81—16.98	533,582	875	1.81
Java #6	5.61	17.10—17.43	1,287,463	746	1.82
Java #3	5.30	17.04—17.22	636,994	935	1.82
Python 3	Python 3.13.0
Java	java 23 2024-09-17 Java HotSpot(TM) 64-Bit Server VM (build 23+37-2369, mixed mode, sharing)