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- #MG SYSTEM SOURCE CODE MANAGING GIGABYTES FULL#
- #MG SYSTEM SOURCE CODE MANAGING GIGABYTES FREE#
- #MG SYSTEM SOURCE CODE MANAGING GIGABYTES WINDOWS#
Dweblogic.Name=%SERVER_NAME% ="C:\Oracle\Middleware" % java -ms32m -mx200m -verbosegc -classpath $CLASSPATH
#MG SYSTEM SOURCE CODE MANAGING GIGABYTES WINDOWS#
This places thread dump information in the proper context with WebLogic Server informational and error messages, and provides a more useful log for diagnostic purposes.įor example, on Windows and Solaris, enter the following: Use the -verbosegc option to turn on verbose garbage collection output for your JVM and redirect both the standard error and standard output to a log file. Monitor the performance of WebLogic Server under maximum load while running your application. The following steps outline this procedure: To determine the most effective heap size, turn on verbose garbage collection and redirect the output to a log file for diagnostic purposes. The verbose garbage collection option ( verbosegc) enables you to measure exactly how much time and resources are put into garbage collection. Using Verbose Garbage Collection to Determine Heap Size įor some pointers about garbage collection from an HP perspective, see "Performance tuning Java: Tuning steps" at. įor a discussion of the garbage collection schemes available with the JRockit JDK, see "Using the JRockt Memory Management System" at. įor a comprehensive explanation of the collection schemes available, see "Improving Java Application Performance and Scalability by Reducing Garbage Collection Times and Sizing Memory Using JDK 1.4.1" at. Refer to the following links for in-depth discussions of garbage collection options for your JVM:įor an overview of the garbage collection schemes available with Sun's HotSpot VM, see "Tuning Garbage Collection with the 5.0 Java Virtual Machine" at. Once you have an understanding of the workload of the application and the different garbage collection algorithms utilized by the JVM, you can optimize the configuration of the garbage collection. For example, some garbage collection schemes are more appropriate for a given type of application. To configure WebLogic Server to detect automatically when you are running out of heap space and to address low memory conditions in the server, see Automatically Logging Low Memory Conditions and Specifying Heap Size Values.ĭepending on which JVM you are using, you can choose from several garbage collection schemes to manage your system memory. To modify heap space values, see Specifying Heap Size Values. You might see the following Java error if you are running out of heap space: To ensure maximum performance during benchmarking, you might set high heap size values to ensure that garbage collection does not occur during the entire run of the benchmark. The goal of tuning your heap size is to minimize the time that your JVM spends doing garbage collection while maximizing the number of clients that WebLogic Server can handle at a given time.
#MG SYSTEM SOURCE CODE MANAGING GIGABYTES FULL#
If you set your heap size in accordance with your memory needs, full garbage collection is faster, but occurs more frequently. If you set a large heap size, full garbage collection is slower, but it occurs less frequently. An acceptable rate for garbage collection is application-specific and should be adjusted after analyzing the actual time and frequency of garbage collections. The JVM heap size determines how often and how long the VM spends collecting garbage.
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A best practice is to tune the time spent doing garbage collection to within 5% of execution time. When an object can no longer be reached from any pointer in the running program, it is considered "garbage" and ready for collection.
#MG SYSTEM SOURCE CODE MANAGING GIGABYTES FREE#
It is a repository for live objects, dead objects, and free memory. The Java heap is where the objects of a Java program live. See "Performance Documentation For the Java Hotspot Virtual Machine: Threading" at. You can choose from multiple threading models and different methods of synchronization within the model, but this varies from JVM to JVM. Ĭhoices you make about Solaris threading models can have a large impact on the performance of your JVM on Solaris.
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See the support page for Mixed Client/Server JVMs at. The Supported Configurations pages at are frequently updated and contain the latest certification information on various platforms.įor WebLogic Server heap size tuning details, see Garbage Collection.Ĭhoosing a GC (garbage collection) schemeĭepending on your application, there are a number of GC schemes available for managing your system memory, as described in Choosing a Garbage Collection Scheme.ĭeployments using different JVM versions for the client and server are supported in WebLogic Server. This release of WebLogic Server supports only those JVMs that are J2SE 5.0-compliant. Use only production JVMs on which WebLogic Server has been certified. Table 5-1 General JVM Tuning Considerations Tuning Factor