Do loop memory consumption?

**Tom Shelton** · Apr 25 '06, 10:15 PM

Re: Do loop memory consumption?

Bill Nguyen wrote:[color=blue]
> The Timer loop below consumes all available CPU time from my development PC.
> I would like to be able to restrict its use of CPU time to minimum since
> it's not actually doing anything but counting down the time left.
> Any help is greatly appreciated.
>
> Bill
>
>
> Dim t As Integer = 0
>
> Dim Start, Finish, TotalTime As Double
>
> 'Start = Microsoft.Visua lBasic.DateAndT ime.Timer
>
> Finish = Start + mSeconds ' Set end time for mseconds duration.
>
> Do While Microsoft.Visua lBasic.DateAndT ime.Timer < Finish
>
> t += 1
>
> lblInfo.Text = "test timer -> " & t
>
> lblInfo.Refresh ()
>
> ' Do other processing while waiting for 5mseconds to elapse.
>
> Loop[/color]

One way to fix this would be to insert System.Thread.S leep (100) right
after your lblInfo.Refresh ().

--
Tom Shelton [MVP]

**Mattias Sjögren** · Apr 25 '06, 10:55 PM

Re: Do loop memory consumption?

Bill,

Have you considered using System.Windows. Forms.Timer instead?

Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**Bill Nguyen** · Apr 25 '06, 11:06 PM

Re: Do loop memory consumption?

Tom;

That seemed to solve my problem. I assinged 1000 miliseconds and CPU time
went down significantly. memory used still about the same, but that I can
afford!
Another question, please:
I need to interrupt the loop when user presses the STOP button. The problem
that btnStop(on the same form) is not accessible during the loop.
Is there a way to check if the button was pressed during the do loop
routine?

Thanks again;

Bill

"Tom Shelton" <tom@mtogden.co m> wrote in message
news:1146002783 .330291.234260@ j33g2000cwa.goo glegroups.com.. .[color=blue]
>
> Bill Nguyen wrote:[color=green]
>> The Timer loop below consumes all available CPU time from my development
>> PC.
>> I would like to be able to restrict its use of CPU time to minimum since
>> it's not actually doing anything but counting down the time left.
>> Any help is greatly appreciated.
>>
>> Bill
>>
>>
>> Dim t As Integer = 0
>>
>> Dim Start, Finish, TotalTime As Double
>>
>> 'Start = Microsoft.Visua lBasic.DateAndT ime.Timer
>>
>> Finish = Start + mSeconds ' Set end time for mseconds duration.
>>
>> Do While Microsoft.Visua lBasic.DateAndT ime.Timer < Finish
>>
>> t += 1
>>
>> lblInfo.Text = "test timer -> " & t
>>
>> lblInfo.Refresh ()
>>
>> ' Do other processing while waiting for 5mseconds to elapse.
>>
>> Loop[/color]
>
> One way to fix this would be to insert System.Thread.S leep (100) right
> after your lblInfo.Refresh ().
>
> --
> Tom Shelton [MVP]
>[/color]

**james** · Apr 26 '06, 01:35 AM

Re: Do loop memory consumption?

Insert an "Application.Do Events: to allow for other proccesses to run. And
then in the btnStop's click event, stop the timer.
james

"Bill Nguyen" <billn_nospam_p lease@jaco.com> wrote in message
news:%23TKG6oLa GHA.3444@TK2MSF TNGP05.phx.gbl. ..[color=blue]
> Tom;
>
> That seemed to solve my problem. I assinged 1000 miliseconds and CPU time
> went down significantly. memory used still about the same, but that I can
> afford!
> Another question, please:
> I need to interrupt the loop when user presses the STOP button. The
> problem that btnStop(on the same form) is not accessible during the loop.
> Is there a way to check if the button was pressed during the do loop
> routine?
>
> Thanks again;
>
> Bill
>
>
> "Tom Shelton" <tom@mtogden.co m> wrote in message
> news:1146002783 .330291.234260@ j33g2000cwa.goo glegroups.com.. .[color=green]
>>
>> Bill Nguyen wrote:[color=darkred]
>>> The Timer loop below consumes all available CPU time from my development
>>> PC.
>>> I would like to be able to restrict its use of CPU time to minimum since
>>> it's not actually doing anything but counting down the time left.
>>> Any help is greatly appreciated.
>>>
>>> Bill
>>>
>>>
>>> Dim t As Integer = 0
>>>
>>> Dim Start, Finish, TotalTime As Double
>>>
>>> 'Start = Microsoft.Visua lBasic.DateAndT ime.Timer
>>>
>>> Finish = Start + mSeconds ' Set end time for mseconds duration.
>>>
>>> Do While Microsoft.Visua lBasic.DateAndT ime.Timer < Finish
>>>
>>> t += 1
>>>
>>> lblInfo.Text = "test timer -> " & t
>>>
>>> lblInfo.Refresh ()
>>>
>>> ' Do other processing while waiting for 5mseconds to elapse.
>>>
>>> Loop[/color]
>>
>> One way to fix this would be to insert System.Thread.S leep (100) right
>> after your lblInfo.Refresh ().
>>
>> --
>> Tom Shelton [MVP]
>>[/color]
>
>[/color]

**ShaneO** · Apr 26 '06, 01:55 AM

Re: Do loop memory consumption?

Bill Nguyen wrote:[color=blue]
> Tom;
>
> That seemed to solve my problem. I assinged 1000 miliseconds and CPU time
> went down significantly. memory used still about the same, but that I can
> afford!
> Another question, please:
> I need to interrupt the loop when user presses the STOP button. The problem
> that btnStop(on the same form) is not accessible during the loop.
> Is there a way to check if the button was pressed during the do loop
> routine?
>[/color]

Hello Bill,

I'd consider changing you code as follows (Watch for line-wrapping) -

Dim blExitLoop as Boolean = False 'Place this in General Declarations
Section

Dim t As Integer = 0
Dim Start, Finish, TotalTime As Double
'Start = Microsoft.Visua lBasic.DateAndT ime.Timer
Finish = Start + mSeconds ' Set end time for mseconds duration.
Do While Microsoft.Visua lBasic.DateAndT ime.Timer < Finish And blExitLoop
= False
t += 1
lblInfo.Text = "test timer -> " & t
'lblInfo.Refres h() 'You can REMOVE this now!
System.Threadin g.Thread.Sleep( 100)
System.Windows. Forms.Applicati on.DoEvents()

' Do other processing while waiting for 5mseconds to elapse.
Loop

(Note the change to your "Do While... Loop above!)

I'd then put the following in your "Stop" Button Click Event -

blExitLoop = True

I hope this helps.

ShaneO

There are 10 kinds of people - Those who understand Binary and those who
don't.

**Bill nguyen** · Apr 26 '06, 02:55 AM

Re: Do loop memory consumption?

This will definitely help!
My thanks to all of you in this thread.

Bill

"ShaneO" <shanearn@optus net.com.au> wrote in message
news:444ecf49$0 $3341$afc38c87@ news.optusnet.c om.au...[color=blue]
> Bill Nguyen wrote:[color=green]
>> Tom;
>>
>> That seemed to solve my problem. I assinged 1000 miliseconds and CPU time
>> went down significantly. memory used still about the same, but that I can
>> afford!
>> Another question, please:
>> I need to interrupt the loop when user presses the STOP button. The
>> problem that btnStop(on the same form) is not accessible during the
>> loop.
>> Is there a way to check if the button was pressed during the do loop
>> routine?
>>[/color]
>
> Hello Bill,
>
> I'd consider changing you code as follows (Watch for line-wrapping) -
>
> Dim blExitLoop as Boolean = False 'Place this in General Declarations
> Section
>
> Dim t As Integer = 0
> Dim Start, Finish, TotalTime As Double
> 'Start = Microsoft.Visua lBasic.DateAndT ime.Timer
> Finish = Start + mSeconds ' Set end time for mseconds duration.
> Do While Microsoft.Visua lBasic.DateAndT ime.Timer < Finish And blExitLoop =
> False
> t += 1
> lblInfo.Text = "test timer -> " & t
> 'lblInfo.Refres h() 'You can REMOVE this now!
> System.Threadin g.Thread.Sleep( 100)
> System.Windows. Forms.Applicati on.DoEvents()
>
> ' Do other processing while waiting for 5mseconds to elapse.
> Loop
>
> (Note the change to your "Do While... Loop above!)
>
> I'd then put the following in your "Stop" Button Click Event -
>
> blExitLoop = True
>
>
> I hope this helps.
>
> ShaneO
>
> There are 10 kinds of people - Those who understand Binary and those who
> don't.[/color]

**Cor Ligthert [MVP]** · Apr 26 '06, 05:55 AM

Re: Do loop memory consumption?

[color=blue]
> For stuff like this... you should be using a Windows Timer to process
> repeatitve GUI events.[/color]

Serious why, I have the idea that once somebody wrote this on a blog and no
everybody is parroting it. In my opinion is for UI (forms) application the
forms timer excellent.

But I can be wrong.

Cor

Cor

**Cor Ligthert [MVP]** · Apr 26 '06, 05:55 AM

Re: Do loop memory consumption?

[color=blue]
> For stuff like this... you should be using a Windows Timer to process
> repeatitve GUI events.[/color]

Why? see for the rest my reply to Mattias.

Cor

**Göran Andersson** · Apr 26 '06, 08:25 AM

Re: Do loop memory consumption?

> The Timer loop below consumes all available CPU time from my development PC.[color=blue]
> I would like to be able to restrict its use of CPU time to minimum since
> it's not actually doing anything but counting down the time left.[/color]

Use Thread.Sleep to make a delay without using CPU time.

**Mattias Sjögren** · Apr 26 '06, 04:55 PM

Re: Do loop memory consumption?

[color=blue]
> I need to interrupt the loop when user presses the STOP button. The problem
>that btnStop(on the same form) is not accessible during the loop.[/color]

That's exactly why you shouldn't sleep on a UI thread. And DoEvents
has its own problems. Again, try it with a timer.

Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**Mattias Sjögren** · Apr 26 '06, 05:14 PM

Re: Do loop memory consumption?

[color=blue]
>In my opinion is for UI (forms) application the
>forms timer excellent.[/color]

I was under the impression that Bill's code is in a winforms
application. So I'm not sure if you're disagreeing with us or what
your point is.

Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

**Cor Ligthert [MVP]** · Apr 26 '06, 05:26 PM

Re: Do loop memory consumption?

>[color=blue][color=green]
>>In my opinion is for UI (forms) application the
>>forms timer excellent.[/color]
>
> I was under the impression that Bill's code is in a winforms
> application. So I'm not sure if you're disagreeing with us or what
> your point is.
>[/color]
Forget it, I just misreaded your messages, we agree completely.

Sorry

:-)

Cor

**Cor Ligthert [MVP]** · Apr 26 '06, 05:35 PM

Re: Do loop memory consumption?

Spam Catcher,

The same as to Mattias,

I misreaded your messages I thougt you were pointing to the
system.systems. timer as I had seen done more, while the forms timer is in my
idea sufficient in this case.

So I thought maybe they have a reason for that and than I want to know why.

Sorry,

Cor.

"Spam Catcher" <spamhoneypot@r ogers.com> schreef in bericht
news:Xns97B1843 E472C7usenethon eypotrogers@127 .0.0.1...[color=blue]
> "Cor Ligthert [MVP]" <notmyfirstname @planet.nl> wrote in
> news:uHinjNPaGH A.4916@TK2MSFTN GP04.phx.gbl:
>[color=green]
>> Serious why, I have the idea that once somebody wrote this on a blog
>> and no everybody is parroting it. In my opinion is for UI (forms)
>> application the forms timer excellent.[/color]
>
> There are 3 timers in .NET - each one for a specific use.
>
> So Timers could be used in forms, in server code, or as a general timer.
> Depends on which class and which scenario.
>
> Better than having a constant loop.
>
> Of course it depends on the situation - some things are better suited for
> a
> thread looping and others for a timer.[/color]

**Bill nguyen** · Apr 27 '06, 05:19 AM

Re: Do loop memory consumption?

I'm willing to learn.
Can you please give me a sample code?
Thanks

Bill

"Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
news:%23360uiLa GHA.4248@TK2MSF TNGP05.phx.gbl. ..[color=blue]
> Bill,
>
> Have you considered using System.Windows. Forms.Timer instead?
>
>
> Mattias
>
> --
> Mattias Sjögren [C# MVP] mattias @ mvps.org
> http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
> Please reply only to the newsgroup.[/color]

Do loop memory consumption?

Do loop memory consumption?

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