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List:       openjdk-serviceability-dev
Subject:    Withdrawn: 8264311: Heap object statistics
From:       duke <duke () openjdk ! java ! net>
Date:       2021-05-28 22:42:22
Message-ID: DlEp1iqc3Nny66D-77JMuL9TZvWWzymKhsS4COrc3xQ=.f52b717a-0ee7-46b0-88e8-78d1bbda4073 () github ! com
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On Tue, 30 Mar 2021 15:04:57 GMT, Roman Kennke <rkennke@openjdk.org> 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


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