FilesExpand file tree

 master

/

MapPerformance.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

92 lines (91 loc) · 2.86 KB

 master

/

MapPerformance.java

Copy path

Top

File metadata and controls

• Code
• Blame

92 lines (91 loc) · 2.86 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

//: containers/MapPerformance.java

// Demonstrates performance differences in Maps.

// {Args: 100 5000} Small to keep build testing short

import java.util.*;

public class MapPerformance {

static List<Test<Map<Integer,Integer>>> tests =

new ArrayList<Test<Map<Integer,Integer>>>();

static {

tests.add(new Test<Map<Integer,Integer>>("put") {

int test(Map<Integer,Integer> map, TestParam tp) {

int loops = tp.loops;

int size = tp.size;

for(int i = 0; i < loops; i++) {

map.clear();

for(int j = 0; j < size; j++)

map.put(j, j);

}

return loops * size;

}

});

tests.add(new Test<Map<Integer,Integer>>("get") {

int test(Map<Integer,Integer> map, TestParam tp) {

int loops = tp.loops;

int span = tp.size * 2;

for(int i = 0; i < loops; i++)

for(int j = 0; j < span; j++)

map.get(j);

return loops * span;

}

});

tests.add(new Test<Map<Integer,Integer>>("iterate") {

int test(Map<Integer,Integer> map, TestParam tp) {

int loops = tp.loops * 10;

for(int i = 0; i < loops; i ++) {

Iterator it = map.entrySet().iterator();

while(it.hasNext())

it.next();

}

return loops * map.size();

}

});

}

public static void main(String[] args) {

if(args.length > 0)

Tester.defaultParams = TestParam.array(args);

Tester.run(new TreeMap<Integer,Integer>(), tests);

Tester.run(new HashMap<Integer,Integer>(), tests);

Tester.run(new LinkedHashMap<Integer,Integer>(),tests);

Tester.run(

new IdentityHashMap<Integer,Integer>(), tests);

Tester.run(new WeakHashMap<Integer,Integer>(), tests);

Tester.run(new Hashtable<Integer,Integer>(), tests);

}

} /* Output: (Sample)

---------- TreeMap ----------

size put get iterate

10 748 168 100

100 506 264 76

1000 771 450 78

10000 2962 561 83

---------- HashMap ----------

size put get iterate

10 281 76 93

100 179 70 73

1000 267 102 72

10000 1305 265 97

------- LinkedHashMap -------

size put get iterate

10 354 100 72

100 273 89 50

1000 385 222 56

10000 2787 341 56

------ IdentityHashMap ------

size put get iterate

10 290 144 101

100 204 287 132

1000 508 336 77

10000 767 266 56

-------- WeakHashMap --------

size put get iterate

10 484 146 151

100 292 126 117

1000 411 136 152

10000 2165 138 555

--------- Hashtable ---------

size put get iterate

10 264 113 113

100 181 105 76

1000 260 201 80

10000 1245 134 77

*///:~