How to troubleshoot JVM performance issues

We recently had a performance issue with our application running on Java 1.4.2 on Windows where the CPU utilization was extremely high. Using the +PrintClassHistogram option I was able to determine that a char array was utilizing more than 500 megabytes of memory.
My question is, is there another option I can include or process I can follow that would help me determine which object was creating this array?
I am not a Java programmer so I apologize if this is elementary question or if I posted this in the wrong forum. I am the SA they call when the application is not running correctly. I have been reading this forum and the manuals trying to find something that would assist me. The developers will fix the problem after I pinpoint where the problem is.
We do not have any type of JVM profiler so I am trying to troubleshoot this issue with thread dumps and JVM options. My assumption is that if a profiler can retrieve the information I should be able to. Is this a correct assumption?
Lastly, if we were to purchase a profiler does anyone have a recommendation on which one to use? Our latest version of the application utilizes Java 5 so we would need something that would work with both versions of Java if possible.
Any assistance or recommendations anyone could provide would be greatly appreciated.

unixmon wrote:
We recently had a performance issue with our application running on Java 1.4.2 on Windows where the CPU utilization was extremely high. Using the +PrintClassHistogram option I was able to determine that a char array was utilizing more than 500 megabytes of memory.
My question is, is there another option I can include or process I can follow that would help me determine which object was creating this array?
I am not a Java programmer so I apologize if this is elementary question or if I posted this in the wrong forum. I am the SA they call when the application is not running correctly. I have been reading this forum and the manuals trying to find something that would assist me. The developers will fix the problem after I pinpoint where the problem is.
This is a management problem. If you have a performance problem then you should be calling the developers and telling them to figure it out and that they need to fix it. You certainly shouldn't be looking at code or profilers.
Unless you have plenty of time on your hands and your goal is to become a developer.
But regardless...
Buying a profiler is an option but if you go that route then to figure out a solution you will be a java programmer even if that isn't your title.
You should however figure out how to simulate load on the server, even with a profiler. There are tools that allow you to send things like http requests, web service requests, etc. Simulating load is a good idea even without a profiler. It allows you to estimate future system needs dependent upon future company growth.
Note that profiling really slows down an application so an app that can handle 10 requests a second might only be able to do 1 a second or less while being profiled.

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Sun JVM Performance Issue in Sun Solaris 10 (SPARC)

Hi,
Issue : Performance issue after the migration of a Java application from IBM-AIX 5 to Sun Solaris 10 (SPARC)
I am facing performance issue after the migration of a Java application from IBM-AIX 5.3 to Sun Solaris 10 (SPARC).
Normally the application takes less than 1 hour to complete the process in AIX, but after migration in Solaris the application is taking 4+ hours.
The Java version of IBM AIX is ,
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build pap32dev-20051104)
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 AIX ppc-32 j9vmap3223-20051103 (JIT enabled)
The Java version of Solaris 10 is,
Java(TM) Platform, Standard Edition for Business (build 1.5.0_17-b04)
Java HotSpot(TM) Server VM (build 1.5.0_17-b04, mixed mode)
Description of Application
The application merges 2 XML files of size 300 MB each using DOM Parser and generates flat file according to certain business logic.No remote files are using for the file generation. There are two folders and around 200 XML file in each folders of similar names. The application loads 2 similar XML file at a time from each folder and Processes. Same way, the application processes all the 200 XML file pairs using loop.
The JVM Parameters are given below.
/usr/java5/bin/java -cp $CLASSPATH -Xms3072m -Xmx3072M com.db.mcc.creditderiv.GCDXMLTransProc
Here the extended swap memory in AIX is 3072 (3GB). After copying the same tode to Solaris, the
application started throwing java.lang.OutofMemoryError. So that we have increased the swap memory up to 12 GB.
Since 32bit Java allows maximum 4 GB extended memory we started using 64 Bit Java in Solaris using -d64 argument.
The Current JVM Parameter in Solaris is given below.
java -d64 -cp $CLASSPATH -Xms8192m -Xmx12288m com.db.mcc.creditderiv.GCDXMLTransProc ( 64 GB Swap Memory is available in the System)
We have tried the following options
1.       Extended heap size up to 12 GB using -xms and -xmx parameters and tried multiple -XX options. Earlier the application was working fine in AIX with 3.5 GB extended heap size. ( 64 GB Swap Memory is available in the System)
2.       Downloaded and installed the Solaris SPARC Patches from the website,
     http://java.sun.com/javase/downloads/index_jdk5.jsp
4. Downloaded and installed XML and XSLT patch from sun website
5.       Tried to run the Java in server mode using -server option.

A 64 bit VM is not necessarily faster than a 32 bit one. I remember at least on suggestion that it could be slower.
Make sure you use the -server option.
As a guess IBM isn't necessarily a slouch when it comes to Java. It might simply be that their VM was faster. Could have used a different dom library as well.
Could be an environment problem of course.
Profiling the application and the machine as well might provide information.

How to go about performance issues

Hi Experts,
Need help on how to get started on below situations.
Users are complaining about queries running slow even after rebuilding indexes,updated stats,no blocking?
How to go about troubleshooting such issues?
Thank you.

http://technet.microsoft.com/en-us/library/ms177500(v=sql.105).aspx
http://redmondmag.com/articles/2013/12/11/slow-running-sql-queries.aspx
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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Large scale of database and data cleansing
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https://sqlsrvintegrationsrv.codeplex.com/discussions/279849
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/f38d1d14-bf33-4d6d-83c4-2daf0da14697/sharepoint-list-destination-fails-on-a-job-but-manually-and-in-power-shell-runs-fine?forum=sqlintegrationservices
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*** performance issue, advice plz...

Hi Experts,
I have a z-table1 in which I have some fileds, I have wrote the select query to fetch the data and got data too, now from this internal table I have to pass a field called SERIAL_NUM to another z-table2, to fetch the CO documents/items.
But in the z-table2 here SERIAL_NUM field is not a key field nor it is having the index, so it is taking time in minutes even to fetch CO doc number/items for 10 serial numbers also.
Here the z-table2 is having abt 42 lacs of records, I guess even to search the doc numbers for this 10 SERIAL_NUM it is looking each time 42 lacs records as a result it is taking time in mins.
Sample code as follows-
LOOP AT it_zeps06 INTO wa_zeps06.
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           belnr
           buzei
           billcode
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           INTO (ws_belnr, ws_buzei, ws_billcode, ws_vbeln)
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Endloop.
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Appreciate you response.
Regards.
DC

Hi,
The first issue is that you are looping over a select statement. What you could do is create another internal table with same fields as the select statement above and then use the table it_zeps06 with FOR ALL ENTRIES options and collect the serial numbers.
This should take much less time than the others. Since you are looping over a select statement, the trip from AServer to DBServer is expensive.
Thanks...
Preethanm S

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Chetan.

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/people/siegfried.boes/blog/2007/09/12/runtimes-of-reads-and-loops-on-internal-tables
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Siegfried

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Mozilla Firefox (preferred)
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Install the Firebug plugin
Install the NetExport 0.6 extension for Firebug
Enable all Firebug panels
Switch to the "Net" panel in Firebug
Click on this link
Export the data from the Firebug Net panel
Click on this link
Export the data from the Firebug Net panel
Browse to the page where you are experiencing the performance problem.
Export the data from the Firebug Net panel
Click on this link
Export the data from the Firebug Net panel
Click on this link
Export the data from the Firebug Net panel
Browse to the page where you are experiencing the performance problem.
Export the data from the Firebug Net panel
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Google Chrome
Open the Developer Tools (Ctrl-Shift-J)
Navigate to the resources tab
Enable resource tracking.
Click on this link
Export the resource loading data.
Reset the data by disabling and enabling resource tracking
Click on this link
Export the data
Reset the data by disabling and enabling resource tracking
Navigate to the page where you experience the performance problem
Export the data
Reset the data by disabling and enabling resource tracking
Click on this link
Export the data
Reset the data by disabling and enabling resource tracking
Click on this link
Export the data
Reset the data by disabling and enabling resource tracking
Navigate to the page where you experience the performance problem
Export the data
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Apple Safari
The Apple Safari Web Inspector has a Resources panel similar to the Resources panel in the Google Chrome developer tools.To get there, follow these steps:
Show the menu bar.
Go to preferences
Go to the Advanced Tab
Check “Show Develop menu in menu bar”.
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Microsoft Internet Explorer
IE does not have native features to analyze web traffic. No plugins have been found that produce the required information (please let us know if we missed any). For now, please reproduce the issue with Firefox, Chrome or Safari.
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Hi
It works, check once again...
regards
Swami

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I am running on OSX 10.10.1 and have a 2009 imac intel and I am having severe latency issues. I am not familiar with macs as this is my home computer used by other family members. Any help on how to troubleshoot why such latency issues?

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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

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Hi guys,
does anyone know how to restrict logging of the portal? Even though I made a change on Visual Administrator -> Services -> Log Configurator setting ALL categories to severity = 'Error', I keep getting 'Info' severity traces logged in defaultTrace.trc (viewed by Logg Viewer). Which in practise means tons of logged trace information! I think this might be one of the reasons we have been experiencing performance issues lately.
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Cheers,
Frank

Hi,
I would not only set the severity of categories to 'Error' but also locations to 'Error'.
A log controller - can be a "category" or a "location". Categories are used for "logging" and represent problem areas such as network, database, security, user interface, etc. Identified by a slash-separated ('/') path of names, prefixed with an additional slash. Locations are used for "tracing" and correspond to places in the development components. Identified by a dot-separated ('.') path of names, which is often the name of the respective java package.
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How to troubleshoot JVM performance issues

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