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https://issues.apache.org/jira/browse/NETBEANS-4037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069005#comment-17069005
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Jan Lahoda commented on NETBEANS-4037:
--------------------------------------
Another angle might be this:
[https://github.com/apache/netbeans/compare/master...jlahoda:NETBEANS-4037?expand=1]
(Unless I am missing something:) The various ClassPaths registered in the
registry probably have references to many roots to which other ClassPaths have
reference as well (like if there are ~180 modules, then many of the are likely
to refer to openide-util-lookup.jar), but getSourceRoots will try to pass every
occurrence through SourceForBinaryQuery.findSourceRoots, add/re-add the
listeners, etc. Seems wasteful - passing a given binary root to findSourceRoots
once should be enough.
> Debugger slow - taken profiler snapshots
> ----------------------------------------
>
> Key: NETBEANS-4037
> URL: https://issues.apache.org/jira/browse/NETBEANS-4037
> Project: NetBeans
> Issue Type: Bug
> Components: debugger - Java
> Affects Versions: 8.2, 11.1, 11.2, 11.3
> Reporter: matteodg
> Assignee: Jan Lahoda
> Priority: Major
> Labels: performance
> Fix For: 12.0
>
> Attachments:
> org.netbeans.modules.debugger.jpda.ui.SourcePath.annotate.npss,
> org.netbeans.modules.debugger.jpda.ui.SourcePath.getURL.npss
>
>
> We have a pretty big NetBeans Platform Application (~180 modules and 5
> suites) and when the debugger reaches the first breakpoint it got stuck: the
> tabs Debugging, Variables, Breakpoints, etc. are all with a "Please wait..."
> node and with the NetBeans sampler I took a few snapshots highlighting it is
> spending a lot of time on calls like:
> * {{org.netbeans.modules.debugger.jpda.ui.SourcePath.getURL()}}
> * {{org.netbeans.modules.debugger.jpda.ui.SourcePath.annotate()}}
> which at the end boil down to a lot of calls like:
> * java.util.concurrent.CopyOnWriteArrayList.remove()
> * java.io.File.isFile()
> Attached the snapshots.
> Then if I press Continue the debugger remain stuck: now Pause and Continue
> buttons in the toolbar are disabled...
> I kept close and restarting NetBeans but no luck... I remember got this
> behavior even with NB 8.2, sometimes though it goes through and I'm able to
> debug, but very rarely!
>
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