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https://issues.apache.org/jira/browse/NETBEANS-2606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849270#comment-16849270
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Shevek commented on NETBEANS-2606:
----------------------------------
Nothing unusual, to be honest. I have my usual set of gradle projects open, I
went away from my laptop last night, came back to the IDE this morning, and
this was the situation. No triggering event that I know of. I vaguely remember
hearing the fan running high late last night, so I'm going to guess this
happened last night, rather than this morning. So I grabbed as much JVM
metadata as I could, then killed it.
Potential fix: There can't be 22 million files in the queue without duplicates;
I don't have 22 million files.
Potential fix: There must be a crossover point where one discards the entire
file-change queue and just walks from scratch?
> NetBeans overallocating FileObject(s), jams up GC, hangs
> --------------------------------------------------------
>
> Key: NETBEANS-2606
> URL: https://issues.apache.org/jira/browse/NETBEANS-2606
> Project: NetBeans
> Issue Type: Bug
> Affects Versions: 11.0
> Reporter: Shevek
> Priority: Major
> Attachments: histo.txt, temp.txt
>
>
> Ubuntu 19.04
> JDK1.8
> JVM stuck in ergonomics, caused by too many FileObjects in memory.
> 10 threads sitting at 99% CPU, presumably mostly GC threads.
> GUI not responding.
> Note that this IDE JVM runs with 2.5Gb heap, and normally uses about 1.5Gb of
> that, so something has gone seriously wrong.
> num #instances #bytes class name
> ----------------------------------------------
> 1: 8839529 424297392
> org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj$FileEventImpl
> 2: 12383724 297209376
> java.util.concurrent.ConcurrentLinkedQueue$Node
> 3: 5520360 220814400
> org.openide.util.WeakListenerImpl$ListenerReference
> 4: 7963905 191133720
> org.openide.filesystems.FCLSupport$DispatchEventWrapperSingle
> 5: 5608373 179467936 java.lang.ref.WeakReference
> 6: 5404854 172955328
> org.openide.util.WeakListenerImpl$ProxyListener
> 7: 123474 111203424 [B
> 8: 4419767 106074408
> org.openide.filesystems.FCLSupport$DispatchEventWrapperMulti
> 9: 5378746 86059936 com.sun.proxy.$Proxy1
> 10: 1929065 77162600
> org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj
> 11: 1992178 74673680 [Ljava.lang.Object;
> 12: 576632 74309864 [C
> 13: 1403506 33684144
> org.openide.filesystems.EventControl$AtomicActionLink
> 14: 1940678 31050848 javax.swing.event.EventListenerList
> 15: 1403503 22456048
> org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory$AsyncRefreshAtomicAction
> At the point where we have over 22 million atomic refresh actions on the
> queue, something has gone VERY WRONG - See NETBEANS-2291 - this particular
> project has only about 200,000 files in it, so where do we get 22 million
> file-refresh actions from? Backpressure on the queue, anyone?
> Log messages:
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@55b26cab
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> null
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@2768760d
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@63f25c86
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@34933167
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@75ba9419
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@1c699d1e
> WARNING [org.netbeans.core.TimableEventQueue]: no snapshot taken
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> org.netbeans.modules.sampler.InternalSampler@12ae60e3
> WARNING [org.netbeans.core.TimableEventQueue]: too much time in AWT thread
> null
> jstack attached.
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