1 The following are examples of j_calltime.d.
3 This script traces the elapsed time of Java methods and prints a report of the
4 top ten in each category. This number is configurable with simple edit of
7 Here it traces the example program, Code/Java/Func_abc
10 Tracing... Hit Ctrl-C to end.
15 311358 method java/lang/String.equals 202
16 311358 method java/lang/Math.min 208
17 311358 method java/lang/String.hashCode 213
18 311358 method java/lang/String.indexOf 302
19 311358 method java/lang/System.arraycopy 360
20 311358 method java/lang/StringBuilder.append 533
21 311358 method java/lang/AbstractStringBuilder.append 549
22 311358 method java/lang/Object.<init> 823
23 311358 method java/lang/String.charAt 1960
26 Top 10 elapsed times (us),
29 Top 10 exclusive method elapsed times (us),
31 311358 method java/nio/ByteBuffer.<init> 5430
32 311358 method java/lang/String.charAt 6079
33 311358 method java/lang/String.<init> 7306
34 311358 method java/lang/StringBuilder.append 10240
35 311358 method java/util/StringTokenizer.scanToken 11075
36 311358 method java/net/URL.<clinit> 12519
37 311358 method java/io/UnixFileSystem.normalize 13218
38 311358 method sun/net/www/ParseUtil.decode 14208
39 311358 method java/lang/Thread.sleep 3016374
42 Top 10 inclusive method elapsed times (us),
44 311358 method sun/misc/Launcher.<clinit> 129120
45 311358 method java/lang/ClassLoader.initSystemClassLoader 129851
46 311358 method java/lang/ClassLoader.getSystemClassLoader 129897
47 311358 method java/lang/ClassLoader.loadClass 267404
48 311358 method java/security/AccessController.doPrivileged 278364
49 311358 method Func_abc.func_c 1009971
50 311358 method Func_abc.func_b 2019995
51 311358 method java/lang/Thread.sleep 3016374
52 311358 method Func_abc.func_a 3027043
53 311358 method Func_abc.main 3027068
55 Counts shows us how many times each different method was called, and how
56 many methods were called in total.
58 The exclusive method elapsed times show the time that each method spent
59 processing code - while not in other method.
61 The inclusive method elapsed times show the time that each method spent
62 processing code, including the time spent in other calls.
64 These elapsed times are the absolute time from when the method began to
65 when it completed - which includes off-CPU time due to other system events
66 such as I/O, scheduling, interrupts, etc.