Re: Excess memory usage growth for a process

I don't disagree with you just note that before 'some change' working OK
no memory leaks, after change, memory leak. We both know your code did not
recompile itself to include a memory leak ...
That reminds has the framework/runtimes been updated/patched?

John Warner


> -----Original Message-----
> From: Discussion of advanced .NET topics. [mailto:ADVANCED-
> [email protected]] On Behalf Of Eddie Lascu
> Sent: Monday, July 27, 2009 12:00 PM
> To: [email protected]
> Subject: Re: [ADVANCED-DOTNET] Excess memory usage growth for a
> process
> 
> Hi John,
> 
> I could check that with our system administrators. Do you think that can
be
> a possible explanation?
> I just talked with one of the DB Admin and she said she made some
changes
> on
> some Stored Produces, but nothing as dramatic as a patch update. She
also
> said that the drivers for the network cards were updated last week, but
I
> can't see how that can affect the memory used by my processes.
> 
> Thanks,
> Eddie
> 
> 
> -----Original Message-----
> From: Discussion of advanced .NET topics.
> [mailto:[email protected]] On Behalf Of
> John Warner
> Sent: Monday, July 27, 2009 11:49 AM
> To: [email protected]
> Subject: Re: [ADVANCED-DOTNET] Excess memory usage growth for a
> process
> 
> Not what you are seeking, but has anything on the server changed? An
> Oracle patch or something of that nature?
> 
> John Warner
> 
> 
> > -----Original Message-----
> > From: Discussion of advanced .NET topics. [mailto:ADVANCED-
> > [email protected]] On Behalf Of Eddie Lascu
> > Sent: Monday, July 27, 2009 11:33 AM
> > To: [email protected]
> > Subject: [ADVANCED-DOTNET] Excess memory usage growth for a
> process
> >
> > Hi guys,
> >
> >
> >
> > I need your help with an issue I am having right now. I have several
> windows
> > services deployed. These services gather some XML files from the
> internet
> > and then parse the content and save the information in the database.
The
> > database is Oracle 11g, so the access is done through ODP.NET. I had
> some
> > issues before (and some of you with good memory may recall my previous
> > questions) where I noticed the memory used by these services growing
> very
> > high. At the time, I understood that some classes in the ODP.NET
library
> use
> > some JAVA code and they are known for not cleaning properly after
them.
> As a
> > result I rewrote my code in such a way that every dynamic allocation
of
> an
> > object from the ODP.NET library was encompassed in an "using"
statement,
> > like this:
> >
> >
> >
> > using (OracleCommand objDbCommand = new
> > OracleCommand(strSqlSelectStatement,
> > objConnection))
> >
> >
> >
> > All was fine for a very long time. All my services kept a constant
size
> when
> > it came to the total memory used, a size that hovered around 55-60 MB.
> This
> > was the case for months. At the beginning I checked the size almost on
a
> > daily basis. After a while, my confidence grew and I only checked it
> once a
> > week or so. Every time I looked at the size of all my processes (I had
4
> > that followed pretty much the same approach on dealing with those
Oracle
> > objects) the size was around that 55-60 MB mark.
> >
> >
> >
> > Now, all of a sudden, this last weekend, the size for some of the
> services
> > shut up to about 690 MB, despite the fact the service was running with
> the
> > exact same code as it did a month ago. This represents a potential
fatal
> > problem for the server that can get to a point where it can no longer
> > allocate memory, so I need to find a way to understand what the heck
is
> > going on. Unfortunately, I do not have any metrics implemented in my
> > application to log the total amount of memory used. That would have
been
> a
> > very good indication on when exactly did this surge started to happen.
I
> > could have checked the Event Viewer to see if the server got hit by a
> > nuclear bomb or something on that precise moment. I really don't get
> this. I
> > mean that's why we moved to .NET in the first place, to be rid of such
> > concerns, like making sure all dynamically allocated objects are then
> > destroyed.
> >
> >
> >
> > Can anyone give me an idea on how to investigate this issue? Are there
> tools
> > out there that could be used to pick at the memory allocated by a
> process
> > and see what are those objects that take up so much  memory? For the
> time
> > being, I have the processes running, but two of them are at or close
to
> 690
> > MB and I don't know how long will I be able to keep them running.
> >
> >
> >
> > If you had an issue like this, what would you try to do?
> >
> >
> >
> > Any suggestion will be greatly appreciated.
> >
> >
> >
> > TIA,
> >
> > Eddie
> >
> >
> >
> >
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