Created
November 30, 2019 16:26
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Java array initialization benchmark.
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package io.miret.etienne.benchmark.arrays; | |
import org.openjdk.jmh.annotations.Benchmark; | |
public class ArrayInitBenchmark { | |
@Benchmark | |
public int[] initialize_only () { | |
return new int[] { | |
0, | |
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, | |
93, | |
94, | |
95, | |
96, | |
97, | |
98, | |
99 | |
}; | |
} | |
@Benchmark | |
public int[] initialize_with_zeros () { | |
return new int[100]; | |
} | |
@Benchmark | |
public int[] initialize_and_set () { | |
int[] arr = new int[100]; | |
arr[0] = 0; | |
arr[1] = 1; | |
arr[2] = 2; | |
arr[3] = 3; | |
arr[4] = 4; | |
arr[5] = 5; | |
arr[6] = 6; | |
arr[7] = 7; | |
arr[8] = 8; | |
arr[9] = 9; | |
arr[10] = 10; | |
arr[11] = 11; | |
arr[12] = 12; | |
arr[13] = 13; | |
arr[14] = 14; | |
arr[15] = 15; | |
arr[16] = 16; | |
arr[17] = 17; | |
arr[18] = 18; | |
arr[19] = 19; | |
arr[20] = 20; | |
arr[21] = 21; | |
arr[22] = 22; | |
arr[23] = 23; | |
arr[24] = 24; | |
arr[25] = 25; | |
arr[26] = 26; | |
arr[27] = 27; | |
arr[28] = 28; | |
arr[29] = 29; | |
arr[30] = 30; | |
arr[31] = 31; | |
arr[32] = 32; | |
arr[33] = 33; | |
arr[34] = 34; | |
arr[35] = 35; | |
arr[36] = 36; | |
arr[37] = 37; | |
arr[38] = 38; | |
arr[39] = 39; | |
arr[40] = 40; | |
arr[41] = 41; | |
arr[42] = 42; | |
arr[43] = 43; | |
arr[44] = 44; | |
arr[45] = 45; | |
arr[46] = 46; | |
arr[47] = 47; | |
arr[48] = 48; | |
arr[49] = 49; | |
arr[50] = 50; | |
arr[51] = 51; | |
arr[52] = 52; | |
arr[53] = 53; | |
arr[54] = 54; | |
arr[55] = 55; | |
arr[56] = 56; | |
arr[57] = 57; | |
arr[58] = 58; | |
arr[59] = 59; | |
arr[60] = 60; | |
arr[61] = 61; | |
arr[62] = 62; | |
arr[63] = 63; | |
arr[64] = 64; | |
arr[65] = 65; | |
arr[66] = 66; | |
arr[67] = 67; | |
arr[68] = 68; | |
arr[69] = 69; | |
arr[70] = 70; | |
arr[71] = 71; | |
arr[72] = 72; | |
arr[73] = 73; | |
arr[74] = 74; | |
arr[75] = 75; | |
arr[76] = 76; | |
arr[77] = 77; | |
arr[78] = 78; | |
arr[79] = 79; | |
arr[80] = 80; | |
arr[81] = 81; | |
arr[82] = 82; | |
arr[83] = 83; | |
arr[84] = 84; | |
arr[85] = 85; | |
arr[86] = 86; | |
arr[87] = 87; | |
arr[88] = 88; | |
arr[89] = 89; | |
arr[90] = 90; | |
arr[91] = 91; | |
arr[92] = 92; | |
arr[93] = 93; | |
arr[94] = 94; | |
arr[95] = 95; | |
arr[96] = 96; | |
arr[97] = 97; | |
arr[98] = 98; | |
arr[99] = 99; | |
return arr; | |
} | |
} |
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