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68 lines
3.6 KiB
Plaintext
68 lines
3.6 KiB
Plaintext
The following are examples of j_calltime.d.
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This script traces the elapsed time of Java methods and prints a report of the
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top ten in each category. This number is configurable with simple edit of
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the DTrace script
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Here it traces the example program, Code/Java/Func_abc
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# j_calltime.d
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Tracing... Hit Ctrl-C to end.
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^C
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Top 10 counts,
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PID TYPE NAME COUNT
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311358 method java/lang/String.equals 202
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311358 method java/lang/Math.min 208
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311358 method java/lang/String.hashCode 213
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311358 method java/lang/String.indexOf 302
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311358 method java/lang/System.arraycopy 360
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311358 method java/lang/StringBuilder.append 533
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311358 method java/lang/AbstractStringBuilder.append 549
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311358 method java/lang/Object.<init> 823
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311358 method java/lang/String.charAt 1960
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0 total - 12020
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Top 10 elapsed times (us),
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PID TYPE NAME TOTAL
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Top 10 exclusive method elapsed times (us),
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PID TYPE NAME TOTAL
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311358 method java/nio/ByteBuffer.<init> 5430
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311358 method java/lang/String.charAt 6079
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311358 method java/lang/String.<init> 7306
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311358 method java/lang/StringBuilder.append 10240
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311358 method java/util/StringTokenizer.scanToken 11075
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311358 method java/net/URL.<clinit> 12519
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311358 method java/io/UnixFileSystem.normalize 13218
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311358 method sun/net/www/ParseUtil.decode 14208
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311358 method java/lang/Thread.sleep 3016374
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0 total - 3344993
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Top 10 inclusive method elapsed times (us),
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PID TYPE NAME TOTAL
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311358 method sun/misc/Launcher.<clinit> 129120
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311358 method java/lang/ClassLoader.initSystemClassLoader 129851
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311358 method java/lang/ClassLoader.getSystemClassLoader 129897
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311358 method java/lang/ClassLoader.loadClass 267404
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311358 method java/security/AccessController.doPrivileged 278364
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311358 method Func_abc.func_c 1009971
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311358 method Func_abc.func_b 2019995
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311358 method java/lang/Thread.sleep 3016374
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311358 method Func_abc.func_a 3027043
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311358 method Func_abc.main 3027068
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Counts shows us how many times each different method was called, and how
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many methods were called in total.
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The exclusive method elapsed times show the time that each method spent
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processing code - while not in other method.
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The inclusive method elapsed times show the time that each method spent
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processing code, including the time spent in other calls.
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These elapsed times are the absolute time from when the method began to
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when it completed - which includes off-CPU time due to other system events
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such as I/O, scheduling, interrupts, etc.
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