Java Profiling

Hi All,
I was wondering if anybody knew how profiling works in Java apps. How is the time computed. Is it based on clock cycles per execution or real time consumed during the excution.
Also should a profiler output be affected by other apps running .
Thanks

There are a lot of profilers for Java, and most of them in fact allow you to choose the way in which time is computed (exact or statistical). Other apps would of course interfere, and although a good tool would
try to factor out some of the interference, it's NOT recommended to run other apps when you do profiling. You never know in what way (e.g. by effectively increasing your app's disk latency, etc.) they may affect your performance.

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I search a java profiler tool free like OPtimiZeit or Jprobe for testing my j2ee application ?
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All that those results say to me is that garbage collection and class loading doesn't represent much of a hit for your application. I think you were after something a little more like...$ java -version
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)
$java -Xrunhprof:help
Hprof usage: -Xrunhprof[:help]|[<option>=<value>, ...]
Option Name and Value   Description             Default
heap=dump|sites|all     heap profiling          all
cpu=samples|times|old   CPU usage               off
monitor=y|n             monitor contention      n
format=a|b              ascii or binary output a
file=<file>             write data to file      java.hprof(.txt for ascii)
net=<host>:<port>       send data over a socket write to file
depth=<size>            stack trace depth       4
cutoff=<value>          output cutoff point     0.0001
lineno=y|n              line number in traces? y
thread=y|n              thread in traces?       n
doe=y|n                 dump on exit?           y
Example: java -Xrunhprof:cpu=samples,file=log.txt,depth=3 FooClass
$java -Xrunhprof:cpu=times,file=prof.txt,depth=10 Shuffle
$cat prof.txt
CPU TIME (ms) BEGIN (total = 180) Mon Nov 19 11:10:57 2001
rank   self accum   count trace method
   1 11.11% 11.11%       5    14 java.util.jar.Attributes.read
   2 5.56% 16.67%       3     9 java.io.PrintStream.write
   3 5.56% 22.22%       1    10 java.util.Properties.load
   4 5.56% 27.78%      30    17 java.io.PrintStream.write
   5 5.56% 33.33%       1     3 java.security.Security.loadProviders
   6 5.56% 38.89%       5    11 java.io.ByteArrayInputStream.<init>
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   8 5.56% 50.00%       1     2 java.lang.ClassLoader$NativeLibrary.load
   9 5.56% 55.56%       5     7 sun.misc.URLClassPath$JarLoader.getClassPath
10 5.56% 61.11%     105     5 java.io.BufferedReader.readLine
11 5.56% 66.67%       1     6 java.io.Win32FileSystem.getBooleanAttributes
12 5.56% 72.22%      44    12 java.lang.StringBuffer.expandCapacity
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14 5.56% 83.33%       1    13 java.lang.ClassLoader.checkCerts
15 5.56% 88.89%       1    18 java.io.FilePermission.<init>
16 5.56% 94.44%      30     4 java.io.PrintStream.newLine
17 5.56% 100.00%     210    15 java.io.Win32FileSystem.isSlashFor example, in the above profile, StringBuffer.expandCapacity takes 5% of the running time, so I might want to create my StringBuffers with higher initial capacity.
BTW- this was running on Windows NT, the runhprof options may be different (or omitted) on other platforms.
Hope this helps,
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Java profiler for WLS6 on Solaris.

Hi,
Is there any profiler that supports the Sun JDK 1.3.0 on Solaris, as
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[dejan_bektchiev.vcf]

To make it work a little better (but 100 times slower ;-) turn off hotspot
and jit!!!
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Deyan D. Bektchiev" <[email protected]> wrote in message
news:[email protected]..
Yes,
It is more stable than the others -- doesn't crash sometimes for 10minutes
but it's not enough for me to collect performance data but I am still
trying so eventually I might be able to gather some.
I keep getting
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# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
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# Problematic Thread: prio=5 tid=0x2a3328 nid=0x8 runnable
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Thanks,
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Cameron Purdy wrote:
Have you tried the JDK's profiler?
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Deyan D. Bektchiev" <[email protected]> wrote in message
news:[email protected]..
Hi,
Is there any profiler that supports the Sun JDK 1.3.0 on Solaris, as
OptimizeIt doesn't even start and JProbe hangs when trying to profile
the server.
Thanks,
Deyan

Java profiler for AMD64 on Eclipse

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To make it work a little better (but 100 times slower ;-) turn off hotspot
and jit!!!
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Deyan D. Bektchiev" <[email protected]> wrote in message
news:[email protected]..
Yes,
It is more stable than the others -- doesn't crash sometimes for 10minutes
but it's not enough for me to collect performance data but I am still
trying so eventually I might be able to gather some.
I keep getting
# HotSpot Virtual Machine Error, Unexpected Signal 11
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Error ID: 4F533F534F4C415249530E435050079A 01
# Problematic Thread: prio=5 tid=0x2a3328 nid=0x8 runnable
but since without the profiler settings I do not get the problem I am
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the JVM crashes at WLS startup sometimes later.
Thanks,
Deyan
Cameron Purdy wrote:
Have you tried the JDK's profiler?
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Deyan D. Bektchiev" <[email protected]> wrote in message
news:[email protected]..
Hi,
Is there any profiler that supports the Sun JDK 1.3.0 on Solaris, as
OptimizeIt doesn't even start and JProbe hangs when trying to profile
the server.
Thanks,
Deyan

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Hi All,
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>
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This only tells you that the JVM is running out of heap space. It doesn't tell you what is causing the problem. You likely have a memory leak, but you could also try increasing the max heap size of the JVM (-Xmx command line option). It would help to watch the % mem in use statistic, but only immediately after a garbage collection cycle (you can force a GC from the admin console). If the % mem in use after the GC is increasing over time, then that likely confirms you have a memory leak. Note that looking at that statistic during the server startup probably is irrelevant. You'd need to wait until the server finishes starting up, and likely processed a few messages (to load static data).
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Performance of a java program.

Dear team,
how I can know when a java application is 'faster'?
I mean, is better to use arrays or not? Is better to use bytes than integers?etc etc...
Do you know any software that it can show me when my program uses low memory, or something that can help me??
Best wishes!

Antony13 wrote:
Dear team,
how I can know when a java application is 'faster'?By measuring it.
I mean, is better to use arrays or not? Is better to use bytes than integers?etc etc...Don't worry about these microoptimizations unless and until you profile and find a bottleneck that could reasonably be caused by one of them. Use the proper data structures and algorithms (which is a CS principle that has nothing to do with Java) and write "dumb" code that's easy to follow and that clearly expresses your design.
Do you know any software that it can show me when my program uses low memory, or something that can help me??Google for java profiler.

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Java Profiling

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