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I have a Java application which has some performance issues and someone recommend me to run it in verbose:gc mode. This has been done, but I don't know how to interpret the logging. Is it possible to explain me what it all means or to advise me as what I can do to increase performance?
Output log can be found on : http://pastebin.com/uDNPEGcd
Thanks in advance, Kind regards, Maarten
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To help you visualize and analyze the GC, you can feed verbose GC log files into various diagnostic tools and interfaces. Examples include tools such as Garbage Collection and Memory Visualizer (GCMV) and online services such as GCEasy.
The important argument here is the -verbose:gc, which activates the logging of garbage collection information in its simplest form. By default, the GC log is written to stdout and should output a line for every young generation GC and every full GC.
Log files can reveal when GC last ran, how long the process lasted, how many objects were promoted, how much memory was reclaimed, and other useful information.
verbose:gc prints right after each gc collection and prints details about each generation memory details. Here is blog on how to read verbose gc
If you are trying to look for memory leak, verbose:gc may not be enough. Use some visualization tools like jhat (or) visualvm etc.,
4416K->512K(4928K), 0.0081170 secs
Before GC used memory is 4416K
After GC used memory is 512K
Total allocated memory is 4928K
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