java gc log analyzer

About 5 things you don't know about Java performance Monitoring-part 2nd: Java process monitoring with JDK built-in analyzer Fully functional built-in analyzers, such as Jconsole and VISUALVM, are sometimes more expensive than their performance costs-especially in systems running on production software. So, in the 2nd article focusing on

This section is interspersed with a little bit of knowledge about how to configure and view a GC log for a Java application in eclipse, as I know by research, because the book is not written in detail and is primarily intended for the next section.I. Configuring the GC in EclipseIn eclipse, if you want to configure a

;Mainstream Java virtual machines do not use this algorithm to manage memory (unresolved problems with circular references between objects)Simple to achieve and high efficiency (application: Flashplayer,python, etc.)2, the Accessibility analysis algorithmThe "GC Roots" object as the starting node, search down, search traversed by the path of the chain of reference, when an object to the

JVM parameter configuration problem. For parameter problems, the former can be configured with the-XMS and-XMX parameters, which can be set by configuring-xx:permsize and-xx:maxpermsize. 9. References: 1. A Brief History of Garbage collection– http://www-128.ibm.com/developerworks/java/library/j-jtp10283/ 2. Garbage collection in the HotSpot jvm– http://www-128.ibm.com/developerworks/java/library/j-jtp11

first, what is Jconsole? Jconsole has been introduced from Java 5. Jconsole is a built-in Java performance Analyzer that can be run from the command line or in a GUI shell. You can easily use Jconsole (or, perhaps, its more high-end "close cousin" VISUALVM) to monitor Java application performance and track code in

First, prefaceIn recent years IT industry willow, a variety of new concepts such as big data, cloud platform, virtualization, etc., springing up endlessly. And the cloud platform, can be said in recent years to lead the era of the trend of the edge of one of the concept, major manufacturers compete to launch a variety of cloud products, seize the cloud market heights. Recently, IBM, the IT century-old factory, has also launched Bluemix, a cloud platform based on cloudfoundry open standards, that

Today, in the online Java code, I handled a problem caused by the ExecutorServicec thread pool and precipitated the processing process and some debugging. Scenario Description In the distributed task processing module, there is a Java daemon process that receives the Java code description task (jar) through the queue and generates the sub-process (separate JVM)

total of 6494k-6373k=121k recycled. The size of the perm area is reduced from 2585K to 2584K, which amounts to a recovery of 1K.The second FGC, the size of the younger generation reduced from 6315K to 4096K, recycled 6315k-4096k=2219k. The old generation increased from 6373K to 8420K, increased by 2047K, and the whole heap was reduced from 12689K to 12516K, with a total of 12689k-12516k=173k recycled. The size of the perm area does not change.B, USEPARALLELOLDGCLog with PARALLELGC.The only diff

not used in mainstream Java Virtual machines ).For a simple example, look at the TESTGC () method in the Code listing: Objects Obja and OBJB have field instance, assignment makes obja.instance = objb and objb.instance = Obja, and beyond that, there are no references to these two objects. In fact, these two objects are no longer accessible, but because they reference each other, resulting in their reference count is not 0, so the reference counting al

This article consists ofimportnew - lomoxy translated from javapapers. Directory Introduction to Garbage collection How does garbage collection work? Categories of garbage collection Garbage collection Monitoring and analysis In this Java GC Series tutorial, let's learn about tools for garbage collection monitoring and analysis. Then, choose a tool to monitor the garbage collection

, for example: The application may be in the calculation of the size of the array, there is an algorithm error, resulting in a large array size, resulting in a large array is allocated.5. OOM for small swap=> example: Exception in Thread "main": Java.lang.OutOfMemoryError:request AnalysisThis type of error is thrown due to a failure to allocate memory from the native heap, and the heap memory may be nearly exhausted. This type of error may not be related to the application, such as the following

In this Java GC Series tutorial, let's learn about tools for garbage collection monitoring and analysis. Then, choose a tool to monitor the garbage collection process for a Java sample program. If you are a beginner, you'd better read this series of tutorials carefully. You can start here (garbage collection Introduction).Jav