1 The following are examples of j_cputime.d. 2 3 This script traces the on-CPU time of Java methods and prints a report. Here 4 it traces the example program, Code/Java/Func_abc 5 6 # j_cputime.d 7 Tracing... Hit Ctrl-C to end. 8 ^C 9 10 Top 10 counts, 11 PID TYPE NAME COUNT 12 311374 method java/lang/String.equals 202 13 311374 method java/lang/Math.min 208 14 311374 method java/lang/String.hashCode 213 15 311374 method java/lang/String.indexOf 302 16 311374 method java/lang/System.arraycopy 360 17 311374 method java/lang/StringBuilder.append 533 18 311374 method java/lang/AbstractStringBuilder.append 549 19 311374 method java/lang/Object.<init> 823 20 311374 method java/lang/String.charAt 1960 21 0 total - 12020 22 23 Top 10 on-CPU times (us), 24 PID TYPE NAME TOTAL 25 26 Top 10 exclusive method on-CPU times (us), 27 PID TYPE NAME TOTAL 28 311374 method java/io/FilePermission$1.run 1055 29 311374 method java/util/Arrays.copyOf 1110 30 311374 method sun/net/www/ParseUtil.decode 1161 31 311374 method java/io/File.<clinit> 1212 32 311374 method java/lang/StringBuilder.append 1228 33 311374 method java/io/UnixFileSystem.normalize 1402 34 311374 method java/lang/String.<init> 2251 35 311374 method java/lang/String.charAt 2262 36 311374 method java/lang/System.initializeSystemClass 2751 37 0 total - 99868 38 39 Top 10 inclusive method on-CPU times (us), 40 PID TYPE NAME TOTAL 41 311374 method java/lang/ClassLoader.loadClassInternal 25826 42 311374 method sun/misc/Launcher$ExtClassLoader.getExtClassLoader 25914 43 311374 method java/net/URL.<init> 27677 44 311374 method sun/misc/Launcher.<init> 28566 45 311374 method sun/misc/Launcher.<clinit> 28744 46 311374 method java/lang/ClassLoader.initSystemClassLoader 29241 47 311374 method java/lang/ClassLoader.getSystemClassLoader 29249 48 311374 method java/lang/System.initializeSystemClass 33814 49 311374 method java/lang/ClassLoader.loadClass 66564 50 311374 method java/security/AccessController.doPrivileged 67499 51 52 You can see that it prints the top ten results in each of four categories. 53 54 The first section reports how many times each subroutine was called, and it's 55 type. 56 57 The second section reports on the on-CPU time of anything that was not of type 58 "method", in this case - none. 59 60 The exclusive method on-CPU times shows, amongst other results, that 61 java/lang/String.charAt spent around 2,200 microseconds on-CPU. This times 62 excludes time spent in other subroutines. 63 64 The inclusive method on-CPU times show the times that various methods 65 spent on-CPU. This includes the time spent in other subroutines called. 66 67 These on-CPU times are the time the thread spent running on a CPU, from when 68 the subroutine began to when it completed. This does not include time 69 spent off-CPU time such as sleeping for I/O or waiting for scheduling. 70 71 On-CPU times are useful for showing who is causing the CPUs to be busy. 72 See Notes/ALLoncpu_notes.txt for more details. Also see 73 Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a 74 detailed explanation of exclusive vs inclusive subroutine time. 75 76
Indexes created Tue Apr 21 00:23:25 UTC 2026