|
1 package tests.jfun.yan.benchmark;
6
7 import java.text.NumberFormat  ;
8
9
20 public abstract class Benchmark {
21 private String title;
22 private long loops;
23 private double average;
24 private double speed;
25 private long elapsed;
26
27 public Benchmark(String title, long loops) {
28 this.title = title;
29 this.loops = loops;
30 }
31
32 public long start() {
33 return start(false);
34 }
35
36 public long start(boolean forceRun) {
37 long loop = loops;
38
39 if (!forceRun) {
40 if (System.getProperty("bench") == null) {
41 System.out.println("Benchmark is disabled, to enable it, append \"-Dbench=true\" to jvm startup args");
42 return 0;
43 }
44 }
45 try {
46 Thread.sleep(100);
47 System.gc();
48 } catch (Exception e) {
49 }
51 long start = System.currentTimeMillis();
52 try {
53 for (int i = 0; i < loop; i++) {
54 run();
55 }
56 } catch (Throwable t) {
57 throw new RuntimeException (t);
58 }
59 long end = System.currentTimeMillis();
60 elapsed = end - start;
61 average = ((double) elapsed) / ((double) loop);
62 speed = (double) loop / (double) elapsed * (double) 1000;
63 NumberFormat nf = NumberFormat.getNumberInstance();
64
65 StringBuffer sb = new StringBuffer ();
66 sb.append("Benchmark of [").append(title).append("]\n");
67 sb.append(" - Loops:\t").append(nf.format(loops)).append("\n");
68 sb.append(" - Elapsed:\t").append(elapsed).append(" ms\n");
69 sb.append(" - Average:\t").append(average).append(" ms/call\n");
70 sb.append(" - Speed:\t").append(nf.format(speed)).append(" calls/scond");
71
72 System.out.println(sb.toString());
73 return elapsed;
74 }
75
76 public abstract void run() throws Exception ;
77
78 public double getAverage() {
79 return average;
80 }
81
82 public long getElapsed() {
83 return elapsed;
84 }
85
86 public long getLoops() {
87 return loops;
88 }
89
90 public double getSpeed() {
91 return speed;
92 }
93
94 public String getTitle() {
95 return title;
96 }
97 }
98 |
Popular Tags |
Java API By Example, From Geeks To Geeks.