The Computer Language
24.11 Benchmarks Game

C++ g++ versus C gcc 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
source secs mem gz cpu secs
* C gcc #6 2.14 19,704 1582 8.43
* C++ g++ #6 3.31 19,760 1535 13.11
* C++ g++ #7 14.03 19,760 1156 14.03
* C gcc #4 14.04 19,704 1190 14.03
C gcc #5 7.29 19,704 917 28.25
C++ g++ #5 7.85 19,760 987 30.68
C++ g++ #4 8.92 19,760 1445 35.00
C++ g++ #2 9.13 19,760 1446 35.73
C gcc #3 36.80 19,704 574 36.79
C++ g++ #3 37.88 19,760 600 37.87
C gcc #8 39.33 19,492 483 39.32
C gcc 39.61 19,704 514 39.60
* C gcc #2 10.19 19,704 1563 39.99
C++ g++ 10.49 19,760 1065 41.21
n-body
source secs mem gz cpu secs
* C gcc #9 2.10 19,772 1639 2.10
* C++ g++ #0 2.15 19,760 1933 2.15
* C gcc #4 4.05 19,772 1398 4.05
* C++ g++ #7 4.11 19,760 1815 4.11
C gcc #6 4.97 19,772 1186 4.97
C++ g++ #9 5.14 19,760 1536 5.14
C gcc #2 5.19 19,772 1270 5.19
C gcc #3 5.23 19,772 1214 5.23
C gcc 5.23 19,772 1179 5.23
C++ g++ #3 5.32 19,760 1402 5.32
* C gcc #5 5.43 19,772 1436 5.43
* C++ g++ #4 5.45 19,760 1434 5.45
C gcc #8 5.54 19,492 1193 5.54
* C++ g++ #2 6.02 19,352 1524 6.01
C++ g++ #5 6.32 19,760 1544 6.32
C++ g++ 6.61 19,760 1666 6.61
C gcc #7 6.89 19,772 1250 6.88
C++ g++ #6 6.93 19,760 1674 6.93
spectral-norm
source secs mem gz cpu secs
* C gcc #6 0.40 19,772 1203 1.59
* C gcc #5 0.72 19,772 576 2.85
* C gcc #7 0.72 19,772 906 2.85
* C gcc #4 0.72 19,772 1145 2.85
* C++ g++ #6 0.73 19,760 1050 2.86
* C++ g++ #5 1.33 19,760 1050 5.28
C++ g++ 5.33 19,760 459 5.33
C gcc #8 5.40 19,772 389 5.39
C gcc #3 1.43 19,772 470 5.70
C++ g++ #7 1.52 19,512 1284 6.04
* C gcc #2   Make Error  
mandelbrot
source secs mem gz cpu secs
* C++ g++ #4 0.89 35,344 3554 3.45
* C++ g++ 0.89 34,952 1797 3.47
* C++ g++ #6 0.98 35,080 1014 3.87
* C gcc #6 1.28 33,400 1147 5.10
C gcc #5 1.63 33,512 788 6.31
C++ g++ #0 2.35 35,476 2752 9.30
* C++ g++ #7 4.86 35,176 749 13.28
C++ g++ #5 13.44 34,636 596 13.43
C++ g++ #9 3.52 35,120 732 13.55
* C gcc #4 3.52 33,060 805 13.89
* C gcc 3.49 32,864 828 13.92
* C gcc #7 3.51 33,276 1000 13.95
* C gcc #3 3.53 32,860 769 14.09
C gcc #9 4.07 33,128 700 15.70
C++ g++ #2 16.95 34,636 700 16.94
C gcc #8 25.15 19,496 412 25.15
C++ g++ #3 27.37 19,760 421 27.36
fasta
source secs mem gz cpu secs
C gcc #3 0.78 19,772 1469 0.78
C gcc #5 1.24 19,616 1286 1.24
C++ g++ #9 0.78 19,352 2758 1.54
C++ g++ #2 1.84 19,760 1129 1.84
C++ g++ 1.92 19,760 1064 1.92
C++ g++ #3 2.63 19,760 1311 2.63
C gcc #2 2.77 19,772 1299 2.76
C gcc #6 0.94 19,772 1936 2.78
C++ g++ #7 0.87 19,760 2711 3.05
C gcc #7 0.82 19,772 2276 3.24
C++ g++ #4 3.32 19,760 1291 3.32
C++ g++ #5 1.06 19,760 2345 3.66
C gcc 3.70 19,772 1213 3.70
C++ g++ #6 1.07 19,760 2326 4.01
C gcc #8 8.06 19,776 839 8.06
C gcc #4   Make Error  
k-nucleotide
source secs mem gz cpu secs
C++ g++ #2 2.01 156,592 1634 5.98
C gcc 3.84 130,408 1512 12.45
C++ g++ #3 4.19 165,580 1280 13.94
C++ g++ 6.96 757,156 1452 14.75
reverse-complement
source secs mem gz cpu secs
* C gcc #7 0.44 499,992 1899 0.59
* C++ g++ #2 0.74 499,916 2099 0.74
C gcc #9 0.48 500,032 1551 0.76
C gcc #6 0.96 675,260 828 1.36
C gcc #5 1.53 994,108 654 1.53
C gcc #2 1.06 994,536 757 1.58
* C gcc #4 3.70 500,452 716 3.69
C++ g++ #6 3.30 1,517,824 1827 4.38
C++ g++ 6.52 980,156 599 6.51
C++ g++ #5 37.59 771,632 704 37.58
C++ g++ #3   Bad Output  
binary-trees
source secs mem gz cpu secs
C++ g++ #7 0.97 201,512 896 3.40
C++ g++ #5 1.16 200,724 891 4.10
C gcc #2 1.53 169,284 816 4.18
C++ g++ #9 1.74 136,120 815 4.63
C gcc #3 1.96 134,540 842 4.70
C++ g++ #3 1.91 265,636 951 4.74
C++ g++ #6 1.91 266,120 851 4.77
C++ g++ #4 2.22 266,136 826 5.20
C++ g++ 2.65 2,153,044 760 9.23
C gcc #8 21.08 285,544 607 21.08
C gcc 21.67 264,244 660 21.67
C++ g++ #2 22.83 265,840 514 22.82
C gcc #5 8.77 351,332 914 31.93
pidigits
source secs mem gz cpu secs
C++ g++ #4 0.71 19,760 521 0.71
* C++ g++ #5 0.73 19,760 804 0.73
C gcc #2 0.74 19,772 422 0.74
C gcc 0.74 19,772 459 0.74
regex-redux
source secs mem gz cpu secs
C gcc #5 0.81 152,500 1403 2.03
C++ g++ #6 1.15 276,336 2856 2.24
C gcc #2 3.21 103,288 1121 3.21
C gcc #4 0.97 152,264 1237 3.28
C gcc #3 1.72 103,736 1273 3.31
C++ g++ #3 12.38 215,640 859 17.95
C++ g++   Make Error  
C++ g++ #2   Make Error  
C++ g++ #5   Make Error  
C++ g++ #4   Make Error  
C++ g++

g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0

C gcc

gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0