Re: More OutOfMemoryException Problems

Tech-Archive recommends: Fix windows errors by optimizing your registry

His doc does shed a lot of light on it. Now you're probably seeing the PPC
memory manage shutting you down becasue you've used enough memory to pass
its cleanup trigger point. This can be avoided by trapping it's call with
an IMessageFilter.

Another thing that has to be considered is fragmentation. If you have 10MB
free, but it's all in small 4k blocks all over, then you ask for 8k or
contiguous memory, you'll still get a failure.

I think the Toolhelp APIs might give you some info. There are some quick
wrappers in the SDF for using them:

www.opennetcf.org/sdf

-Chris



"Tom Robson" <TomRobson@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:0E37D59B-2A82-4601-9A65-6009DF85196C@xxxxxxxxxxxxxxxx
>I am completely lost. GC.GetTotalMemory tells me one thing. The
> Settings...System...Memory tells me something else. Neither reflect
> anything
> like 32Mb. The system is telling nothing. I am beginning to think that I
> have
> something wrong with my set up here or something.
> I am now not getting OutOfMemoryExceptions. The app is now just
> disappearing
> with a little ActiveSync Beep-Boop to tell me that the connection has
> gone,
> VS then telling me its lost its connection.
> I am amzed that nobody can tell of accurate way of telling how much memory
> is being used by an application and frustrated that I simply dont know
> where
> to go.
> A bit of a rant - sorry.
> Can anybody suggest anything (dont send me in Bolings direction, as his
> document although interesting doesnt shed any light on my situation).
>
>
> "Tom Robson" wrote:
>
>> I am already running GC.Collect. This then dovetails with
>> GC.GetTotalMemory,
>> which typically returns around 4Mb. In addition around the same time as I
>> get
>> the OOutOfMemroyException, I seam to be also getting an
>> InvalidOperationException on a collection that I use to move a set of
>> controls around. I say 'about' as it is about the 40th 'form' (set of
>> controls) that I display.
>>
>> I assume that the GC will do a better job of defragmentation than 85%,
>> and
>> therefore a nothing problem must be there. I might have as many as 1000
>> control objects in various arrays and collections by this time. Could
>> this be
>> a limitation.
>>
>> Would I be correct in assuming that with 1000 controls sitting around in
>> collections and arrays, I would expect to be using mor than 4Mb of
>> memory? If
>> so then the GC is reporting incorrectly, and I need to create some sort
>> of
>> broker. Fine I can do that (begrudgingly).
>>
>> If 1000 controls and 4Mb might sound realistic then it might be about
>> right,
>> and then I need to chase up what bit of memory is running out. Could it
>> be
>> some graphics memory or DLL memory. I dont know how all this fits
>> together,
>> how I could check this or if an OutOfMemoryException might be thwe
>> upshot.
>>
>> I look forward to your responses.
>>
>> "Chris Tacke, eMVP" wrote:
>>
>> > You can test the fragmentation theory by manually calling a GC.Collect.
>> > Not
>> > usually recommended, but it'll definitely let you know.
>> >
>> > --
>> > Chris Tacke
>> > Co-founder
>> > OpenNETCF.org
>> > Are you using the SDF? Let's do a case study.
>> > Email us at d c s @ o p e n n e t c f . c o m
>> > http://www.opennetcf.org/donate
>> >
>> >
>> > "Chris Botha" <chris_s_botha@xxxxxxxxxxxxx> wrote in message
>> > news:O2Q6ZV56FHA.1032@xxxxxxxxxxxxxxxxxxxxxxx
>> > > If creating/disposing the controls causes the problem then this will
>> > > fix
>> > > it. I am not sure if fragmentation is your problem, but if
>> > > creating/disposing controls causes fragmentation then this will
>> > > reduce
>> > > fragmentation.
>> > >
>> > >
>> > > "Tom Robson" <TomRobson@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> > > news:7A1BE547-F1F2-42D6-81F3-41E0CEAD9478@xxxxxxxxxxxxxxxx
>> > >>A control manager is something I have considered. However I felt that
>> > >>the
>> > >> management of all that might create more problems than it solves,
>> > >> but I
>> > >> like
>> > >> it anyway.
>> > >>
>> > >> Do you think that this will reduce the fragmentation? If I am not
>> > >> creating
>> > >> asdn disposing of the controls, will this reduce the fragmentation
>> > >> of the
>> > >> heap. A cause of 75% memory wastage if the earlier reply is
>> > >> accurate.
>> > >>
>> > >> Thanks very much both of you.
>> > >>
>> > >> "Chris Botha" wrote:
>> > >>
>> > >>> An idea may be to re-use the controls instead of creating them
>> > >>> every
>> > >>> time.
>> > >>> So have something like a TextBoxManager, it has an ArrayList
>> > >>> containing
>> > >>> textboxes, ask it for a textbox when you need one, if one exists in
>> > >>> the
>> > >>> list
>> > >>> it gives it else it creates a new one. When you remove a control
>> > >>> from
>> > >>> the
>> > >>> form give it back. Do the same for other controls.
>> > >>>
>> > >>> "Tom Robson" <TomRobson@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> > >>> news:D7B8C9F0-0326-4706-8629-31C99B1BCD04@xxxxxxxxxxxxxxxx
>> > >>> >I am getting another OutOfMemory problem which seams a little
>> > >>> >strange.
>> > >>> >
>> > >>> > I have only tested in debug as yet, so this may be significant,
>> > >>> > but
>> > >>> > basically I have a big app, which uses one form and adds and
>> > >>> > remove
>> > >>> > controls
>> > >>> > on the form to make up to about 50 different forms according to
>> > >>> > configuration. I have used one form to make sure things are both
>> > >>> > fast
>> > >>> > and
>> > >>> > efficient with memory and this fundamentally works well.
>> > >>> > I have found that I am getting an OutOfMemoryException sometimes
>> > >>> > when
>> > >>> > I am
>> > >>> > creating controls to polace on the form.
>> > >>> > I have looked into the Garbage Collector (GC) a bit so I checked
>> > >>> > on
>> > >>> > memory
>> > >>> > GetTotalMemory and it said 4.7Mb, which is about what I would
>> > >>> > expect.
>> > >>> > I am
>> > >>> > using a 128Mb XDAIIs, and I have about 60Mb free for programs and
>> > >>> > 30Mb
>> > >>> > free
>> > >>> > for storage.
>> > >>> >
>> > >>> > Should I be getting this message.
>> > >>> > Does GC.GetTotalMemory reflect the Total Memory Used, or does it
>> > >>> > not
>> > >>> > include
>> > >>> > fragmentation, work differently with DLLs or anything.
>> > >>> > I have also read some stuff about 64Kb methods causing OOM
>> > >>> > Exceptions,
>> > >>> > but
>> > >>> > that doesnt mean anything to me.
>> > >>> > I have also read about the Systems Out Of Memory Dialog, but I
>> > >>> > think
>> > >>> > this
>> > >>> > is
>> > >>> > a myth, as I have never seen one.
>> > >>> >
>> > >>> > I am sure that I can drop a load of stuff behind me if I want,
>> > >>> > but I
>> > >>> > was
>> > >>> > hoping to leave that until the next version. MVPs - Help me move
>> > >>> > to
>> > >>> > VS2005
>> > >>> > by
>> > >>> > nailing this issue.
>> > >>> > Thanks in advance.
>> > >>>
>> > >>>
>> > >>>
>> > >
>> > >
>> >
>> >
>> >


.

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