com.tagtraum.perf.gcviewer.imp

Class DataReaderUnifiedJvmLogging

java.lang.Object

com.tagtraum.perf.gcviewer.imp.AbstractDataReader

com.tagtraum.perf.gcviewer.imp.DataReaderUnifiedJvmLogging

All Implemented Interfaces:

DataReader

public class DataReaderUnifiedJvmLogging
extends AbstractDataReader

DataReaderUnifiedJvmLogging can parse all gc events of unified jvm logs with default decorations.

Currently needs the "gc" selector with "info" level and "uptime,level,tags" decorators (Java 9.0.1). Also supports "gc*" selector with "trace" level and "time,uptime,level,tags" decorators, but will ignore some of the debug and all trace level info (evaluates the following tags: "gc", "gc,start", "gc,heap", "gc,metaspace".

• minimum configuration with defaults supported: -Xlog:gc:file="path-to-file"
• explicit minimum configuration needed: -Xlog:gc=info:file="path-to-file":tags,uptime,level
• maximum detail configuration this parser is able to work with: -Xlog:gc*=trace:file="path-to-file":tags,time,uptime,level

Only processes the following information format for Serial, Parallel, CMS, G1 and Shenandoah algorithms, everything else is ignored:

 [0.731s][info][gc           ] GC(0) Pause Init Mark 1.021ms
 [0.735s][info][gc           ] GC(0) Concurrent marking 74M->74M(128M) 3.688ms
 [43.948s][info][gc             ] GC(831) Pause Full (Allocation Failure) 7943M->6013M(8192M) 14289.335ms
 

For more information about Shenandoah see: Shenandoah Wiki at OpenJDK

Field Summary

Fields inherited from class com.tagtraum.perf.gcviewer.imp.AbstractDataReader

gcResource, in

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DataReaderUnifiedJvmLogging(GCResource gcResource, InputStream in)

Method Summary

Modifier and Type	Method and Description
GCModel	read() A call to this method should read a GCModel.

Methods inherited from class com.tagtraum.perf.gcviewer.imp.AbstractDataReader

getDataReaderTools, getLogger, shouldContinue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DataReaderUnifiedJvmLogging

protected DataReaderUnifiedJvmLogging(GCResource gcResource,
                                      InputStream in)
                               throws UnsupportedEncodingException

Throws:

UnsupportedEncodingException

Method Detail

read

public GCModel read()
             throws IOException

Description copied from interface: DataReader

A call to this method should read a GCModel.

Specified by:

read in interface DataReader

Specified by:

read in class AbstractDataReader

Returns:

GCModel representing a gc log file

Throws:

IOException - thrown, when an exception reading the file occurred