Scott,
if you use VisualVM, you can save the sampler data: press Snapshot (last
icon above the data table), and then on the Snapshot tab that appears,
there is "Export Snapshot Data" icon (again above the data table, looks
like a diskette). The benefit of that is that we can do drill-down to
the hotspots with that data file.
-S.
Dne 05. 11. 21 v 18:19 Scott Palmer napsal(a):
VisualVM indicates that "W32 File Monitor" is constantly using CPU,
regardless of what is happening in the IDE, like it is in a busy loop.
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier$1.run
()30,109 ms (100%)30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier.access$100
()30,109 ms (100%)30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier.waitForChange
()30,109 ms (100%)30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.$Proxy4.GetQueuedCompletionStatus
()30,109 ms (100%)30,109 ms (100%)
com.sun.jna.Library$Handler.invoke ()30,109 ms (100%)30,109 ms
(100%)
The key difference is that when waiting for the Open Project dialog, CPU
time is also accumulating elsewhere. e.g. in "Inactive Request
Processor Thread"
Inactive RequestProcessor thread [Was:Explorer
Actions/org.netbeans.modules.openide.explorer.ExplorerActionsImpl$ActionStateUpdater]173,499
ms (100%)36,594 ms (100%)
org.openide.util.RequestProcessor$Processor.run ()190,800 ms
(100%)36,594 ms (100%)
java.lang.Object.wait[native] ()163,209 ms (81.1%)0.0 ms (0%)
org.openide.util.lookup.Lookups.executeWith ()37,990 ms
(23.4%)36,594 ms (100%)
Here is a list of hotspots... note that the top 4 items are just
constantly increasing every second.
All I have done since starting the sampling is show the open Project
dialog and cancel it a few times.
image.png
(Hopefully the screenshot comes through)
Scott
On Fri, Nov 5, 2021 at 4:57 AM Svata Dedic <[email protected]
<mailto:[email protected]>> wrote:
Hi,
When it happens again, either run VisualVM in parallel & monitor, or
take a few thread dumps in sequence (CTRL + \ in console or SIGQUIT
signal). Maybe the thread dumps could lead us to what blocks project
open or takes so much time. File a JIRA issue + attach the visualvm
snapshots or thread dumps. Thanks.
-S.
Dne 05. 11. 21 v 4:29 Scott Palmer napsal(a):
> I've hit this exception a couple times now... I'm just trying to
open
> Gradle projects. Note that the Open Project... dialog takes a
very long
> time to appear, unacceptably long - tens of seconds.
>
> java.lang.NullPointerException: Cannot invoke "String.equals(Object)"
> because "value" is null
> at
>
org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:154)
> at
>
org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:149)
> at
>
org.netbeans.modules.project.ui.OpenProjectListSettings.setStringList(OpenProjectListSettings.java:169)
> at
>
org.netbeans.modules.project.ui.OpenProjectListSettings.setOpenProjectsDisplayNames(OpenProjectListSettings.java:219)
> at
>
org.netbeans.modules.project.ui.OpenProjectList.saveProjectList(OpenProjectList.java:1462)
> at
>
org.netbeans.modules.project.ui.OpenProjectList.access$2300(OpenProjectList.java:116)
> at
>
org.netbeans.modules.project.ui.OpenProjectList$10.run(OpenProjectList.java:873)
> at
>
org.netbeans.modules.project.ui.OpenProjectList$10.run(OpenProjectList.java:870)
> at
>
org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:229)
> at org.openide.util.Mutex.writeAccess(Mutex.java:252)
> at
>
org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:870)
> at
>
org.netbeans.modules.project.ui.OpenProjectList$6.run(OpenProjectList.java:672)
> at
org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
> at
>
org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
> at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
> [catch] at
>
org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
>
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