facebook / mysql-5.6
Unit Size

The distribution of size of units (measured in lines of code).

Intro
  • Unit size measurements show the distribution of size of units of code (methods, functions...).
  • Units are classified in four categories based on their size (lines of code): 1-20 (small units), 20-50 (medium size units), 51-100 (long units), 101+ (very long units).
  • You should aim at keeping units small (< 20 lines). Long units may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.
Learn more...
Unit Size Overall
  • There are 25,982 units with 435,099 lines of code in units (33.1% of code).
    • 549 very long units (111,637 lines of code)
    • 1,112 long units (77,036 lines of code)
    • 3,517 medium size units (108,917 lines of code)
    • 4,358 small units (64,174 lines of code)
    • 16,446 very small units (73,335 lines of code)
25% | 17% | 25% | 14% | 16%
Legend:
101+
51-100
21-50
11-20
1-10
Unit Size per Extension
101+
51-100
21-50
11-20
1-10
cc26% | 19% | 28% | 15% | 11%
c30% | 22% | 27% | 11% | 7%
inc69% | 7% | 11% | 9% | 1%
cpp25% | 25% | 25% | 11% | 12%
pl31% | 16% | 29% | 13% | 8%
java6% | 3% | 17% | 22% | 50%
pm14% | 16% | 25% | 18% | 25%
py11% | 16% | 28% | 19% | 24%
h0% | 2% | 12% | 17% | 67%
hpp0% | <1% | 6% | 17% | 74%
t0% | 0% | 27% | 19% | 52%
php0% | 0% | 41% | 31% | 26%
js0% | 0% | 27% | 48% | 23%
Unit Size per Logical Component
primary logical decomposition
101+
51-100
21-50
11-20
1-10
storage25% | 19% | 22% | 13% | 19%
sql22% | 16% | 26% | 16% | 18%
mysql-test50% | 10% | 18% | 12% | 7%
client40% | 19% | 19% | 13% | 6%
mysys18% | 22% | 32% | 14% | 11%
plugin15% | 21% | 32% | 16% | 13%
extra15% | 19% | 24% | 17% | 23%
strings30% | 22% | 24% | 12% | 9%
zlib34% | 18% | 31% | 10% | 4%
xtrabackup38% | 14% | 29% | 10% | 6%
mysys_ssl39% | 16% | 24% | 10% | 8%
sql-common20% | 17% | 36% | 14% | 11%
arcanist14% | 18% | 33% | 15% | 18%
regex43% | 19% | 28% | 4% | 3%
libmysql8% | 26% | 33% | 9% | 23%
dbug16% | 10% | 40% | 18% | 13%
libevent12% | 12% | 14% | 30% | 30%
libmysqld10% | 23% | 35% | 20% | 10%
unittest3% | 1% | 30% | 29% | 35%
vio6% | 16% | 52% | 15% | 9%
fbson0% | 20% | 32% | 22% | 24%
packaging0% | 73% | 0% | 16% | 10%
scripts0% | 23% | 43% | 26% | 6%
include0% | 0% | 37% | 33% | 29%
cmake0% | 0% | 68% | 16% | 15%
utils0% | 0% | 29% | 35% | 35%
win0% | 0% | 57% | 33% | 9%
Alternative Visuals
Longest Units
Top 50 longest units
Unit# linesMcCabe index# params
2522 7 1
1250 2 3
1222 2 6
1120 6 1
1015 4 1
1008 188 4
960 197 5
795 178 2
783 227 4
776 13 1
750 171 4
731 12 1
703 168 9
680 139 9
660 195 5
655 154 7
631 188 2
599 1 0
595 165 4
594 172 2
593 103 9
590 171 2
562 124 2
553 154 12
538 132 6
524 111 3
512 82 1
510 98 9
480 3 1
456 86 8
455 106 4
436 70 5
430 86 3
411 110 3
403 68 10
402 10 1
401 109 1
399 2 1
398 26 4
398 96 9
395 106 8
379 79 14
372 96 7
369 75 5
366 105 6
366 128 2
362 144 2
362 6 1
354 77 2
350 71 3