Hi Jun, 1. Search for PLAB
2. The following are pretty much all printing-GC-related flags we have: PrintGC PrintGCDetails PrintGCTimeStamps PrintGCDateStamps PrintTenuringDistribution PrintGCTaskTimeStamps PrintApplicationConcurrentTime PrintApplicationStoppedTime You might want to try the last three options. Plus, "-XX:+UseG1GC +XX:+PrintGCDetails" has more verbose gc logs than other collectors'. Thanks. Tao Mao On Fri, Feb 19, 2016 at 8:15 PM, Jun Zhuang <jun.zhu...@hobsons.com> wrote: > Hi, > > > > I tried to find answers to a couple of questions I have regarding GC but > found nothing on the Internet, I wonder if the experts here can help me out? > > > > · How are objects stored in the old generation when promoted from > the young gen or survivor space? Does the JVM use something similar to the > TLAB? > > · The time for a young GC pause consists stack scan, card scan > and copying, are there command line options for me to get a time breakdown > for those times in the GC log? > > > > Thanks, > > Jun > > > > *Jun Zhuang* > > *Sr. Performance QA Engineer* | Hobsons > <https://www.hobsons.com/?utm_source=outlook&utm_medium=email&utm_campaign=banner_02.12.16_general> > > T: +1 513 746 2288 | jun.zhu...@hobsons.com > > 50 E-Business Way, Suite 300 | Cincinnati, OH 45241 | USA > > > > > > [image: Hobsons] > This message contains confidential information and is intended only for > the intended recipients. If you are not an intended recipient you should > not disseminate, distribute or copy this e-mail. Please notify the sender > immediately by e-mail if you have received this e-mail by mistake and > delete this e-mail from your system. E-mail transmission cannot be > guaranteed to be secure or error-free as information could be intercepted, > corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. > The sender therefore does not accept liability for any errors or omissions > in the contents of this message, which arise as a result of e-mail > transmission. If verification is required please request a hard-copy > version. > > _______________________________________________ > hotspot-gc-use mailing list > hotspot-gc-use@openjdk.java.net > http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use > >
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