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Java verbose:gc How to read the output?

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问题 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 回答1: verbose:gc prints right after each gc collection and prints details about each generation memory details.

Java verbose:gc How to read the output?

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Analyzing gc logs

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I am using -XX:+PrintGCApplicationStoppedTime and -XX:+PrintGCApplicationConcurrentTime options to turn on gc logging. But found that only after 4 0r 5 prints of PrintGCApplicationStoppedTime my actual details of gc logs printed through -XX:+PrintGCDetails command! By definition PrintGCApplicationStoppedTime prints application stopped time for every gc. But I am not clear why it prints like the example shown below. Is that because PrintGCApplicationStoppedTime just prints after every safe point reach (or) the log file will be logged by different gc threads. Im using Concurrent sweep for full

Analyzing gc logs

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问题 I am using -XX:+PrintGCApplicationStoppedTime and -XX:+PrintGCApplicationConcurrentTime options to turn on gc logging. But found that only after 4 0r 5 prints of PrintGCApplicationStoppedTime my actual details of gc logs printed through -XX:+PrintGCDetails command! By definition PrintGCApplicationStoppedTime prints application stopped time for every gc. But I am not clear why it prints like the example shown below. Is that because PrintGCApplicationStoppedTime just prints after every safe