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https://issues.apache.org/jira/browse/NETBEANS-1359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16657857#comment-16657857
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Jan Lahoda commented on NETBEANS-1359:
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Regarding why the internal classes are used: first, am I right that there is no
public API to convert an instance of ThreadInfo into CompositeData? Assuming
there's no such API, I asked the original author offline why something like
'MBeanServer.invoke(<threadBean>, "dumpAllThreads", ...' is not used instead,
and the answer was performance. My understanding is: this is effectively a
profiler that runs in the same VM that is profiled. It is therefore crucial the
overhead is kept minimal. So the current sampler is trying to defer all work
that can be deferred to the point when the sampling stops (and so the
additional overhead can't affect the outcomes of the sampling). So while the
sampling runs, only the ThreadInfos are collected and stored (but to share
memory, their stack traces are "interned"), and are only converted to
CompositeData and written out to disk. Using invoke would not only be slower,
but also more memory intensive, adding more overhead to the sampling. It would
be ideal if there would be an API method to convert ThreadInfo to CompositeData
which NetBeans could use.
> Profiling the IDE hangs when saving snapshot
> --------------------------------------------
>
> Key: NETBEANS-1359
> URL: https://issues.apache.org/jira/browse/NETBEANS-1359
> Project: NetBeans
> Issue Type: Bug
> Components: platform - JDK Problems
> Affects Versions: 10.0
> Reporter: Glenn Holmer
> Assignee: Glenn Holmer
> Priority: Blocker
> Labels: netcat
> Attachments: stacktrace.txt
>
>
> 1) Click "Profile the IDE" icon in the Performance toolbar to start profiling
> the IDE.
> 2) Open some projects, files within them, etc. to create some activity for
> the profiler.
> 3) Click the icon again (which is now labelled "Stop IDE Profiling and Take a
> Snapshot").
> This last action should create and open a profiler snapshot, but the "Saving
> snapshot" progress bar in the status area of NetBeans never goes anywhere and
> a snapshot is not opened.
>
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