On Tue, 30 Mar 2021 15:04:57 GMT, Roman Kennke <[email protected]> wrote:
> For Lilliput evaluation, it would be useful to be able to get some statistics > about heap objects, e.g. how many objects there typically are, what is their > (average) size, how big is the live data set, how many objecs have an > identity hash code and how many objects are locked. Some of that information > may be useful for general purpose too, e.g. the avg live data set and object > size/count information might be quite useful to have. > > Heap object statistics can be gathered and printed by invoking java with > -XX:+UnlockDiagnosticVMOptions -XX:+HeapObjectStats -Xlog:heap+stats. It will > impact performance of the workload. The sampling interval can be specificed > by -XX:HeapObjectStatsSamplingInterval=X (in ms) and defaults to 500 (ms). > > Testing: > - [x] Some manual tests, verifying the plausability of the output by hand > - [ ] tier1 > - [ ] tier2 This pull request has been closed without being integrated. ------------- PR: https://git.openjdk.java.net/jdk/pull/3271
