The following are examples of j_cputime.d. This script traces the on-CPU time of Java methods and prints a report. Here it traces the example program, Code/Java/Func_abc # j_cputime.d Tracing... Hit Ctrl-C to end. ^C Top 10 counts, PID TYPE NAME COUNT 311374 method java/lang/String.equals 202 311374 method java/lang/Math.min 208 311374 method java/lang/String.hashCode 213 311374 method java/lang/String.indexOf 302 311374 method java/lang/System.arraycopy 360 311374 method java/lang/StringBuilder.append 533 311374 method java/lang/AbstractStringBuilder.append 549 311374 method java/lang/Object. 823 311374 method java/lang/String.charAt 1960 0 total - 12020 Top 10 on-CPU times (us), PID TYPE NAME TOTAL Top 10 exclusive method on-CPU times (us), PID TYPE NAME TOTAL 311374 method java/io/FilePermission$1.run 1055 311374 method java/util/Arrays.copyOf 1110 311374 method sun/net/www/ParseUtil.decode 1161 311374 method java/io/File. 1212 311374 method java/lang/StringBuilder.append 1228 311374 method java/io/UnixFileSystem.normalize 1402 311374 method java/lang/String. 2251 311374 method java/lang/String.charAt 2262 311374 method java/lang/System.initializeSystemClass 2751 0 total - 99868 Top 10 inclusive method on-CPU times (us), PID TYPE NAME TOTAL 311374 method java/lang/ClassLoader.loadClassInternal 25826 311374 method sun/misc/Launcher$ExtClassLoader.getExtClassLoader 25914 311374 method java/net/URL. 27677 311374 method sun/misc/Launcher. 28566 311374 method sun/misc/Launcher. 28744 311374 method java/lang/ClassLoader.initSystemClassLoader 29241 311374 method java/lang/ClassLoader.getSystemClassLoader 29249 311374 method java/lang/System.initializeSystemClass 33814 311374 method java/lang/ClassLoader.loadClass 66564 311374 method java/security/AccessController.doPrivileged 67499 You can see that it prints the top ten results in each of four categories. The first section reports how many times each subroutine was called, and it's type. The second section reports on the on-CPU time of anything that was not of type "method", in this case - none. The exclusive method on-CPU times shows, amongst other results, that java/lang/String.charAt spent around 2,200 microseconds on-CPU. This times excludes time spent in other subroutines. The inclusive method on-CPU times show the times that various methods spent on-CPU. This includes the time spent in other subroutines called. These on-CPU times are the time the thread spent running on a CPU, from when the subroutine began to when it completed. This does not include time spent off-CPU time such as sleeping for I/O or waiting for scheduling. On-CPU times are useful for showing who is causing the CPUs to be busy. See Notes/ALLoncpu_notes.txt for more details. Also see Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a detailed explanation of exclusive vs inclusive subroutine time.