Mr. Kishalmi had much better advice.  Do what he said instead of the below.

-- 
Mark A. Flacy
[email protected]

On Wednesday, October 20, 2021 2:28:44 PM CDT Mark A. Flacy wrote:
> Greetings,
> 
> The next step would be to run some tool such as jconsole or jvisualvm on the
> same machine to see what is going on in your netbeans  instance.
> 
> At least you will find out what thread is creating trouble.
> 
> --
> Mark A. Flacy
> [email protected]
> 
> On Wednesday, October 20, 2021 1:57:03 PM CDT Thomas Wolf wrote:
> >  Hi Mark,
> > 
> > I think this CPU abuse happens independent of project size or resources. 
> > I
> > already had modified my netbeans.conf to give it plenty of heap (2-4gb),
> > but I’m not even running anything  ‘large’ - when this happens, there are
> > always only two projects open in the IDE - one is a library project with
> > just a couple dozen java files and a J2SE project with less than 100
> > source
> > files.  Downright puny!  A few years back I was working on a  project with
> > 5000 java files and NB never even broke a sweat.  This bug with external
> > changes causing NB a tizzy has been around for awhile.  I think there was
> > a
> > way to turn external checking off, but I can’t seem to find it right now.
> > Plus the disadvantage would be that when I do occasionally externally
> > inject changes (eg copying an image file into the project source tree), NB
> > might not react appropriately. :-(
> > 
> > Anyway, any further suggestions, let me know.  Much appreciated.
> > 
> > Tom
> > 
> > p.s. has anyone noticed that macOS Monterey now no longer has an
> > “Anywhere”
> > option in System Settings->Security & Privacy->General->Allow apps
> > downloaded from ??? Annoying as hell.  It’s already refused to run half a
> > dozen things I downloaded and wanted to run - have to manually give an
> > exception :-(  Does anyone know of a way to turn this off?  I haven’t
> > tried
> > downloading a new version of NB lately, but macOS won’t run that either, I
> > don’t think, without manual exception.
> > 
> > 
> > 
> > On Oct 20, 2021 at 1:18:58 PM, Mark A. Flacy <[email protected]>
> > 
> > wrote:
> > > Greetings,
> > > 
> > > How many projects are in your projects panel?
> > > 
> > > If you haven't modified (God, I hate this)
> > > "/Applications/NetBeans/Apache\
> > > NetBeans\
> > > 12.4.app/Contents/Resources/NetBeans/netbeans/etc/netbeans.conf"
> > > to allow a larger heap than the paltry default, you may be observing the
> > > JVM performing the garbage collection of death dance which you'll see in
> > > any java application that is operating at the edge of getting an OOM
> > > error.
> > > 
> > > 
> > > 
> > > I have a MacBook Pro for work (32GB RAM) and I have changed the
> > > *netbeans_default_options* in the above file to have the additional flag
> > > of "-J-Xmx16384m" as well as setting *netbeans_jdkhome* to point to
> > > something sane.
> > > 
> > > HTH.
> > > 
> > > 
> > > --
> > > 
> > > Mark A. Flacy
> > > 
> > > [email protected]
> > > 
> > > On Wednesday, October 20, 2021 11:54:02 AM CDT Thomas Wolf wrote:
> > > > I have NB 12.4, but I have noticed the same behavior on previous NBs
> > > > as
> > > > 
> > > > well:
> > > > 
> > > > 
> > > > 
> > > > Most of the time, my MacBook Pro is quiet as can be.  But every now
> > > > and
> > > > 
> > > > then (every other day?), I’d be surfing the web or reading the mail
> > > > when
> > > 
> > > my
> > > 
> > > > fans start spinning up - often getting to their max speed *and staying
> > > > 
> > > > there*.  Usually, I’m not doing anything CPU intensive at all and when
> > > > I
> > > > 
> > > > look at the Activity Monitor, it’s always Netbeans taking 100-200% of
> > > > the
> > > > 
> > > > CPU.  And *always*, when open the Netbeans window, there at the bottom
> > > > 
> > > > would be a message indicating that NB is checking (or waiting? can’t
> > > > 
> > > > remember the exact wording) for external changes.  I assume that’s the
> > > > NB
> > > > 
> > > > feature that checks to see if any project-related source was modified
> > > > 
> > > > outside the IDE?   This has got to be a bug - there’s no way something
> > > 
> > > like
> > > 
> > > > that should be a heavy load on a CPU.
> > > > 
> > > > 
> > > > 
> > > > Is there something I can do when I next observe this behavior to help
> > > 
> > > track
> > > 
> > > > down this bug?  I think I’ve had this happen for at least a year.  If
> > > 
> > > there
> > > 
> > > > isn’t - is there a way to globally turn it off?
> > > > 
> > > > 
> > > > 
> > > > I’m on macOS 12.0.1 (Monterey) running NB with OpenJDK 17, but as I
> > > > said,
> > > > 
> > > > this has happened on earlier NB and earlier versions of Java.  My
> > > 
> > > computer
> > > 
> > > > is standalone - i.e. no corporate network, not networked file systems.
> > > > 
> > > > Just the laptop and a wireless connection to the Internet (via
> > > > Starlink
> > > > 
> > > > and, before that, via Verizon LTE).
> > > > 
> > > > 
> > > > 
> > > > Thanks for any suggestions,
> > > > 
> > > > Tom
> 
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