The Computer Language
25.03 Benchmarks Game

C# versus C++ g++

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# #5 2.35 9.03 33,559 1485 7.63
* C++ g++ #6 3.33 13.12 5,800 1535 4.64
* C++ g++ #7 14.06 14.04—14.11 2,449 1156 2.95
C# #2 30.41 30.39 32,924 584 8.13
C++ g++ #5 7.86 30.73—30.82 5,792 987 3.67
* C# #9 8.43 33.37 34,038 1232 7.74
C++ g++ #4 8.91 34.99—35.47 5,710 1445 12.14
C++ g++ #2 9.14 35.88—36.26 5,698 1446 11.86
C++ g++ #3 37.89 37.90—37.99 2,351 600 2.70
C# #6 9.95 39.50—39.54 33,300 1075 7.64
C++ g++ 10.53 41.25—41.55 5,534 1065 3.88
C# #3 11.04 44.49—46.04 33,182 1117 7.89
C# #8 43.84 43.83—43.87 32,858 519 7.51
n-body      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C++ g++ #0 2.15 2.16 2,417 1933 3.66
* C# #9 3.20 3.18 32,059 2480 7.92
* C# #4 3.77 3.75 32,215 2137 8.55
* C++ g++ #7 4.09 4.12—4.17 5,124 1815 4.18
* C# #7 4.83 4.81 32,297 1715 7.54
* C# #6 4.85 4.84 32,203 1754 7.89
C++ g++ #9 5.15 5.17 2,486 1536 3.03
C++ g++ #3 5.33 5.34 2,482 1402 2.85
* C++ g++ #4 5.46 5.46 2,482 1434 2.83
C++ g++ #2 6.02 6.02—6.10 2,490 1524 3.04
C++ g++ #5 6.33 6.35 2,478 1544 2.92
C++ g++ 6.62 6.64 2,499 1666 3.15
C# #3 6.68 6.66 33,280 1311 7.62
C# #2 6.92 6.92 33,280 1339 7.93
C++ g++ #6 6.94 6.93—6.98 2,499 1674 2.98
C# #8 7.24 7.23 32,870 1335 7.70
C# 7.68 7.67 33,341 1424 7.60
C# #0 7.68 7.67 33,300 1342 7.60
spectral-norm      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C++ g++ #6 0.72 2.86 3,981 1050 3.08
* C# #5 0.96 3.44—3.64 37,929 776 8.71
* C++ g++ #5 1.33 5.28 5,820 1050 2.86
C++ g++ 5.34 5.34 5,292 459 3.75
C# #8 5.43 5.41 33,214 441 7.70
C# #3 1.56 5.82 36,172 890 8.36
C++ g++ #7 1.53 6.07 4,071 1284 2.71
C# #2   Empty  
mandelbrot      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C++ g++ #4 0.89 3.46 37,941 3554 5.04
* C++ g++ 0.90 3.48 37,626 1797 3.59
* C++ g++ #6 0.98 3.87 37,908 1014 4.36
C++ g++ #0 2.36 9.31 38,281 2752 4.60
* C# #7 3.23 12.59—12.90 73,056 915 7.76
C++ g++ #7 4.87 13.30 38,048 749 3.03
C++ g++ #5 13.47 13.49 36,884 596 2.76
C++ g++ #9 3.53 13.59 37,863 732 3.03
* C# 3.97 15.56—15.67 70,214 1980 10.98
* C# #9 3.95 15.46—15.61 70,402 822 7.95
C# #5 4.08 15.88 68,202 851 11.86
C++ g++ #2 16.96 16.96 36,704 700 3.28
C# #8 26.42 26.42 33,915 492 7.59
C# #3 6.81 26.76—26.83 66,859 722 7.65
C++ g++ #3 27.38 27.38 5,181 421 3.69
C# #2 47.72 48.00—48.46 33,300 504 7.60
fasta      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C# #9 1.23 1.23 33,571 1512 7.79
* C++ g++ #9 0.78 1.56 6,214 2758 6.43
C++ g++ #2 1.85 1.85 5,108 1129 2.89
C++ g++ 1.93 1.93 5,104 1064 2.98
C++ g++ #3 2.63 2.63 5,284 1311 3.33
C++ g++ #7 0.88 3.06 6,304 2711 4.58
C++ g++ #4 3.34 3.34 2,363 1291 3.03
C++ g++ #5 1.07 3.69—3.73 7,012 2345 3.90
C++ g++ #6 1.08 3.90 7,127 2326 3.72
C# #5 1.53 5.45—5.54 47,833 1702 7.79
C# #8 5.80 5.49 37,343 904 8.59
C# 1.80 6.22—6.38 40,841 2113 7.88
k-nucleotide      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C++ g++ #2 2.02 6.05—6.54 162,349 1634 7.41
C# 3.26 10.80—11.05 190,829 2046 7.66
C++ g++ #3 4.19 13.83—14.44 171,622 1280 5.17
C++ g++ 7.04 15.17—15.69 778,510 1452 6.55
C# #6 5.73 15.07—15.28 189,972 1615 7.65
C# #4 12.25 43.35—45.07 606,466 1725 7.64
C# #7 42.96 43.57—43.83 557,740 1449 7.50
C# #8 87.51 79.54—80.86 1,408,664 736 7.89
reverse-complement      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C++ g++ #2 0.76 0.76 514,101 2099 4.30
* C# #9 0.68 1.51 550,793 2641 12.35
C# 3.32 3.31—3.39 666,341 1130 7.59
C# #5 2.59 3.87 1,056,952 1620 7.47
C# #6 1.75 4.03—4.07 1,058,517 1627 7.69
C# #7 1.69 4.47—4.62 967,602 1312 11.98
C++ g++ 6.55 6.55—6.68 1,006,805 599 3.43
C# #3 8.65 13.47—13.71 1,266,110 934 8.01
C++ g++ #5 37.66 37.65—37.69 792,846 704 3.40
C++ g++ #6   Bad Output  
C++ g++ #3   Bad Output  
binary-trees      [ Contentious. Different approaches. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C++ g++ #7 1.01 3.46—3.62 175,108 896 7.50
C++ g++ #5 1.17 4.12—4.17 208,171 891 3.87
C++ g++ #9 1.76 4.66—4.82 140,571 815 4.05
C++ g++ #6 1.93 4.90—5.09 273,973 851 4.98
C++ g++ #3 2.28 5.06—5.10 273,715 951 4.79
C++ g++ #4 2.22 5.20—5.33 273,977 826 5.16
C++ g++ 2.69 9.43—9.52 1,896,727 760 5.34
C# #2 6.47 18.08—18.35 1,107,055 717 7.59
C# #7 6.40 18.01—18.41 1,053,831 706 7.48
C# 7.20 20.10—20.51 3,005,301 668 8.11
C# #3 7.42 20.59—21.11 3,014,975 688 7.55
C++ g++ #2 22.77 22.81—23.05 274,080 514 3.52
C# #6   Empty  
pidigits      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C++ g++ #4 0.72 0.72 6,496 521 3.45
* C++ g++ #5 0.73 0.73 6,300 804 3.34
* C# #6 0.84 0.82 34,796 1182 7.91
* C# #5 0.86 0.89 37,335 990 7.47
* C# #4 1.31 1.30 35,496 1135 7.69
C# #7 11.08 9.19—10.76 44,098 579 7.80
regex-redux      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C++ g++ #6 1.14 2.25 285,639 2856 5.06
* C# #2 1.43 2.64 402,747 1881 7.54
C# 4.63 4.83 618,988 641 7.95
C# #5 1.90 5.18—5.38 632,472 679 7.53
C++ g++ #3 12.37 18.03—18.68 222,614 859 12.29
C# #4 8.59 30.62—33.76 882,033 854 7.44
C++ g++   Empty  
C++ g++ #2   Empty  
C++ g++ #5   Empty  
C++ g++ #4   Empty  
C#

.NET SDK 9.0.100
Host Version: 9.0.0
Commit: 9d5a6a9aa4

<OutputType>Exe
<TargetFramework>net9.0
<ImplicitUsings>enable
<Nullable>enable
<AllowUnsafeBlocks>true
<ServerGarbageCollection>true
<ConcurrentGarbageCollection>true
<PublishAot>false

C++ g++

g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0