The Computer Language
25.03 Benchmarks Game

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
Python 3 #5 1.40 1.36 15,606 369 7.20
* 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
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)