Memory Leaks?

[David Schwartz]

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My app
definitely has some memory leaks, so I did a simple test to see if it was my
app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with the
following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between 10-20K
when I click the button to show Form2. When I close Form2, the memory is
not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[CJ Taylor]

http://www.scitech.se/memprofiler/

go here.

find out why.

"David Schwartz" <da**@hr-symphony.com> wrote in message
news:OO******** ******@TK2MSFTN GP10.phx.gbl...

I see the same results by using System.GC.GetTo talMemory... Memory is not
completely reclaimed.
"CJ Taylor" <[cege] at [tavayn] dit commmmm> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Did you read my comments? basically, task manager is a P.O.S.
"David Schwartz" <da**@hr-symphony.com> wrote in message
news:ex******** ******@TK2MSFTN GP11.phx.gbl...

Yes, I read the article, and basically it says that .NET handles all

memory

management for me. The problem is that my little test program proves
otherwise - memory is not reclaimed when I close a form.

"Armin Zingler" <az*******@free net.de> wrote in message
news:40******** *************@n ews.freenet.de. ..
> "David Schwartz" <da**@hr-symphony.com> schrieb
> > Then why is the memory not completely reclaimed?
>
> Did you read the article?
>
>
> --
> Armin
>
> How to quote and why:
> http://www.plig.net/nnq/nquote.html
> http://www.netmeister.org/news/learn2quote.html
>

[Raymond Lewallen]

CJ,

Can't find this tool on SciTech's website. Is www.scitechsoft.com correct?

Raymond Lewallen

"CJ Taylor" <[cege] at [tavayn] dit commmmm> wrote in message
news:#A******** ******@tk2msftn gp13.phx.gbl...

On top of that, Microsoft Task Manager doesn't really deal well with a
managed environment, in fact, it kinda sucks in general. When .NET releases memory Task manager doesn't really catch it sometimes, or whats reported as being released and really is sometimes varies.

With those other links given to you you will also see tht GC invokes about
once every 47 seconds... How this number came to be, I don't know, but
almost every GC test I see always results to about that number.

cooky..

You can always get your memory usage by using

GC.GetTotalMemo ry(False)

I use .NET Memory Profiler by scitech, great tool...

"David Schwartz" <da**@hr-symphony.com> wrote in message
news:ez******** ******@TK2MSFTN GP09.phx.gbl...

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My app

definitely has some memory leaks, so I did a simple test to see if it was my

app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with the
following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between

10-20K

when I click the button to show Form2. When I close Form2, the memory

is not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[CJ Taylor]

http://www.scitech.se/memprofiler/

"Raymond Lewallen" <Ra************ ******@nospam.f aa.gov> wrote in message
news:uK******** *****@TK2MSFTNG P10.phx.gbl...

CJ,

Can't find this tool on SciTech's website. Is www.scitechsoft.com correct?
Raymond Lewallen

"CJ Taylor" <[cege] at [tavayn] dit commmmm> wrote in message
news:#A******** ******@tk2msftn gp13.phx.gbl...

On top of that, Microsoft Task Manager doesn't really deal well with a
managed environment, in fact, it kinda sucks in general. When .NET

releases

memory Task manager doesn't really catch it sometimes, or whats reported

as

being released and really is sometimes varies.

With those other links given to you you will also see tht GC invokes about

once every 47 seconds... How this number came to be, I don't know, but
almost every GC test I see always results to about that number.

cooky..

You can always get your memory usage by using

GC.GetTotalMemo ry(False)

I use .NET Memory Profiler by scitech, great tool...

"David Schwartz" <da**@hr-symphony.com> wrote in message
news:ez******** ******@TK2MSFTN GP09.phx.gbl...

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My

app

definitely has some memory leaks, so I did a simple test to see if it

was

my

app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with

the following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between

10-20K

when I click the button to show Form2. When I close Form2, the memory

is not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[Raymond Lewallen]

Nevermind, you just posted the link elsewhere in this thread. Thanks.

"Raymond Lewallen" <Ra************ ******@nospam.f aa.gov> wrote in message
news:uK******** *****@TK2MSFTNG P10.phx.gbl...

CJ,

Can't find this tool on SciTech's website. Is www.scitechsoft.com correct?
Raymond Lewallen

"CJ Taylor" <[cege] at [tavayn] dit commmmm> wrote in message
news:#A******** ******@tk2msftn gp13.phx.gbl...

On top of that, Microsoft Task Manager doesn't really deal well with a
managed environment, in fact, it kinda sucks in general. When .NET

releases

memory Task manager doesn't really catch it sometimes, or whats reported

as

being released and really is sometimes varies.

With those other links given to you you will also see tht GC invokes about

once every 47 seconds... How this number came to be, I don't know, but
almost every GC test I see always results to about that number.

cooky..

You can always get your memory usage by using

GC.GetTotalMemo ry(False)

I use .NET Memory Profiler by scitech, great tool...

"David Schwartz" <da**@hr-symphony.com> wrote in message
news:ez******** ******@TK2MSFTN GP09.phx.gbl...

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My

app

definitely has some memory leaks, so I did a simple test to see if it

was

my

app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with

the following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between

10-20K

when I click the button to show Form2. When I close Form2, the memory

is not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[David Schwartz]

Ah, now that makes sense! I just tested this out and confirmed that the
memory is indeed released as the system needs it (when I open up many more
applications).

Thanks!

"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> wrote in message
news:c5******** ****@ID-208219.news.uni-berlin.de...

* "David Schwartz" <da**@hr-symphony.com> scripsit:

Yes, I read the article, and basically it says that .NET handles all memory management for me. The problem is that my little test program proves
otherwise - memory is not reclaimed when I close a form.

That's by design. The GC will release the memory if the system needs
memory. Don't worry about that!

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Arcer P]

Someone posted a solution in another group:

System.GC.WaitF orPendingFinali zers()
System.GC.Colle ct()

This problem becames really bad when you deal with graphics.

David Schwartz wrote:

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My app
definitely has some memory leaks, so I did a simple test to see if it was my
app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with the
following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between 10-20K
when I click the button to show Form2. When I close Form2, the memory is
not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[CJ Taylor]

You really shoulnd't ever call the garbage collector...
"Arcer P" <[e-mail]> wrote in message
news:Ol******** ******@TK2MSFTN GP10.phx.gbl...

Someone posted a solution in another group:

System.GC.WaitF orPendingFinali zers()
System.GC.Colle ct()

This problem becames really bad when you deal with graphics.

David Schwartz wrote:

Has anyone noticed memory leaks in their VB.NET Windows Forms apps? My app definitely has some memory leaks, so I did a simple test to see if it was my app or something about VB.NET.

I created a test app with 2 forms. Form1 has a command button with the
following code:
Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim x As New Form2
x.Show()
End Sub

Watching the memory usage, I see that the used memory goes up between 10-20K when I click the button to show Form2. When I close Form2, the memory is not reclaimed.

Is there something I need to do to reclaim memory when closing a form?

Thanks!

[Cor Ligthert]

Hi CJ,

Some people/organizations like it when a program does a lot of processes
that do nothing.

Than they can say that the process they have are very heavy.
I think we can give this answer to someone who needs that the next time.

Function multiply(byval a as integer, byval b as integer) byval as integer
dim c = 0
if b > a then ' to be sure the longest way is taken
For i as integer = 1 to b
c = c + a
System.GC.WaitF orPendingFinali zers()
System.GC.Colle ct()
next
else
For i as integer = 1 to a
c = c + b
System.GC.WaitF orPendingFinali zers()
System.GC.Colle ct()
next
(I know that there should be a -1 to b also in)

However this is very good programming in a special class, I see it before me
never more use
c = a*b however only
c = multiply(a,b)

And no memory leaks of course for this calculation

Before someone thinks it, this is not a serious solution.
Cor.