我有一个Java应用程序,它有一些性能问题,有人建议我在verbose:gc模式下运行它.这已经完成,但我不知道如何解释日志记录.是否有可能向我解释这一切意味着什么,或建议我如何提高绩效？
输出日志可在以下网址找到:http://pastebin.com/uDNPEGcd
在此先感谢,亲切的问候,马腾
我正在使用-XX:+PrintGCApplicationStoppedTime和-XX:+PrintGCApplicationConcurrentTime选项打开gc日志记录.
但发现只有PrintGCApplicationStoppedTime经过-XX:+PrintGCDetails命令打印的gc日志的4 0r 5打印后我的实际细节!
根据定义,PrintGCApplicationStoppedTime打印应用程序停止每个gc的时间.
但我不清楚为什么它打印如下所示的例子.
是因为
PrintGCApplicationStoppedTime 只需在每个安全点到达后打印
(要么)
日志文件将由不同的gc线程记录.我使用Concurrent扫描完整的GC和年轻一代的ParNew
我的应用是web应用程序.
O/p模式 - 我是这样的:
Application time: 0.3847031 seconds
Total time for which application threads were stopped: 0.3135419 seconds
Application time: 0.1520723 seconds
Total time for which application threads were stopped: 0.1993920 seconds
Application time: 0.1188219 seconds
Total time for which application threads were stopped: 0.1993920 seconds
Application time: 0.1188219 seconds
Total time for which application threads were stopped: 0.1993920 …