On 24/10/17 07:24, amith pawar wrote: > Is it good to have bulk zeroing feature/pass in GC where once sweeping is > done then do bulk zero ? If this is done then during allocation step > zeroing is not required as it is done in GC itself. > > Not sure how much time GC will take for this. > > I may not be the first person to think this way and thought to ask here. > Does JAVA spec allows this (such pass in GC)? if so any pointers on that. > It will help me to understand more.
It's called -XX:+ZeroTLAB. See also ReduceBulkZeroing. It may or may not be effective: zeroing at allocation time is fairly cache friendly, whereas zeroing when allocating a new TLAB isn't going to be. Some architectures have cache-missing bulk zeroing, which might help. -- Andrew Haley Java Platform Lead Engineer Red Hat UK Ltd. <https://www.redhat.com> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671 _______________________________________________ hotspot-gc-use mailing list hotspot-gc-use@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
