garbage collection - cost time meaning of java gc.log? -


2017-08-15t00:02:07.653+0800: [gc2017-08-15t00:02:07.653+0800: [parnew: 235967k->15723k(235968k), 0.0227136 secs] 364848k->144604k(1022400k), 0.0227920 secs] [times: user=0.08 sys=0.00, real=0.03 secs]

2017-08-15t00:02:12.540+0800: [full gc2017-08-15t00:02:12.540+0800: [cms: 128880k->87130k(786432k), 0.3387968 secs] 162905k->87130k(1022400k), [cms perm : 70825k->70786k(524288k)], 0.3388920 secs] [times: user=0.34 sys=0.00, real=0.34 secs]

what black secs mean? time gc cost? equals pause of process caused gc? mean second gc event cause process suspend 0.3387968 secs? not process run concurrently possibly type garbage collector,e.g., cms?

you might want read this article, breaks down anatomy of gc.log file.

in summary, yes, highlighted portions of log file refer time taken complete each of gc events.

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