command line only mode

[chewiebug]

GCViewer should be have a command line only mode so that no interaction is required to process a gc log file. This mode would allow the use of gcviewer in automated scripts. Add option to support export of graph as image.

[nsureshn]

This mode should include the feature of exporting the graph (as image - GIF/PNG) in addition to CSV data.

[thierry-feltin]

Command line mode should not not depend on any GUI component to run : That is should be able to run in a non interative session/shell. This would allow to use it in automated builds/test suites.

[chewiebug]

I agree.

[dleborgne]

I have a java class that takes a gc.log filename and prints some information (throughput, max used mem after gc, total gc'ed mem) on System.out using GCViewer classes. Here is my source code :

import com.tagtraum.perf.gcviewer.*;
import java.io.FileInputStream; 
import java.io.File;
import java.util.logging.Logger;
import java.util.logging.Level; 
import java.util.Locale;

public class GCLogStatistics {

    private final GCLogStatistics i = null; 
    private static final DataReaderFactory factory = new DataReaderFactory();

    public static void main (String args[]) {

        if (args == null || args.length != 1) { 
            System.out.println("Usage: GCLogStatistics gc.log");
            return; 
        }

        GCLogStatistics i = new GCLogStatistics(args[0]);
    }

    GCLogStatistics(String filename) {
        
        try {
            final File f = new File(filename);
            final FileInputStream in = new FileInputStream(f);
            final DataReader reader = factory.getDataReader(in);
            final GCModel model = reader.read();

            System.out.printf(Locale.US,"THROUGHPUT:%2.2f\n",model.getThroughput());
            System.out.println("MAXUSEDMEM:"+model.getPostFullGCUsedMemory().getMax()); 
            System.out.println("TOTALGCEDMEM:"+model.getFreedMemory()); 

        } catch (Exception e ) {
            System.err.println (e.toString ()); 
        }
    }
    
}

[chewiebug]

Hi David,

Thank you for this sample. There is another user working on this issue (pbilstein). His approach extracts more information. When he releases his code I'll have to see how I can combine the two different approaches.

Regards, Jörg