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processor timeHi,
I have a calculation program in vb.net who is running for let us say for more than a hour. When I will do meanwhile something els in a office program I see that my calculation program takes a great part (maybe 80% or more) of the processor time and I want that it is for both 50% when the office program is using the processor. Is this normal and can I do somthing in the code of my calculation program or is this simple impossible. Thanks for any response. > I have a calculation program in vb.net who is running for let us say for For the thread(s) that do the calculating, set> more than a hour. > When I will do meanwhile something els in a office program I see that my > calculation program takes a great part (maybe 80% or more) of the processor > time and I want that it is for both 50% when the office program is using > the processor. > Is this normal and can I do somthing in the code of my calculation program > or is this simple impossible. > Thanks for any response. thread.Priority = Threading.ThreadPriority.BelowNormal Your calculation will relinquish the cpu to other processes (eg office) and their threads whenever the others make cpu demands. When other processes are idle, your calculation will use 100% cpu. thanks!
Show quoteHide quote "AMercer" <AMer***@discussions.microsoft.com> schreef in bericht news:5FA869AE-6E4A-4ECB-B062-49F03D224146@microsoft.com... >> I have a calculation program in vb.net who is running for let us say for >> more than a hour. >> When I will do meanwhile something els in a office program I see that my >> calculation program takes a great part (maybe 80% or more) of the >> processor >> time and I want that it is for both 50% when the office program is >> using >> the processor. >> Is this normal and can I do somthing in the code of my calculation >> program >> or is this simple impossible. >> Thanks for any response. > > For the thread(s) that do the calculating, set > thread.Priority = Threading.ThreadPriority.BelowNormal > Your calculation will relinquish the cpu to other processes (eg office) > and > their threads whenever the others make cpu demands. When other processes > are > idle, your calculation will use 100% cpu. Hello AMercer,
Adjusting thread priorities is NOT a good idea if you can avoid it. I'm thinking about Office and I can't conceive of a sinple application in that suite that would require 50% of the processor. Word sits idle most of the time.. so does Excel.. Outlook may consume a tiny bit more but for the most part it too is idle.. -Boo Show quoteHide quote >> I have a calculation program in vb.net who is running for let us say >> for >> more than a hour. >> When I will do meanwhile something els in a office program I see that >> my >> calculation program takes a great part (maybe 80% or more) of the >> processor >> time and I want that it is for both 50% when the office program is >> using >> the processor. >> Is this normal and can I do somthing in the code of my calculation >> program >> or is this simple impossible. >> Thanks for any response. > For the thread(s) that do the calculating, set > thread.Priority = Threading.ThreadPriority.BelowNormal > Your calculation will relinquish the cpu to other processes (eg > office) and > their threads whenever the others make cpu demands. When other > processes are idle, your calculation will use 100% cpu. > > Adjusting thread priorities is NOT a good idea if you can avoid it. I'm If one wants decent response from another app, office or otherwise, lowering > thinking about Office and I can't conceive of a sinple application in that > suite that would require 50% of the processor. Word sits idle most of the > time.. so does Excel.. Outlook may consume a tiny bit more but for the most > part it too is idle.. the priority of a cpu bound worker is just about perfect. In every version of windows that I have used, a cpu bound thread adversely affects the responsiveness of other interactive apps. I have set the following commands in my program and it started obviously
well : Dim tr As New Thread(AddressOf HaalUitverkorenen) tr.Priority = Threading.ThreadPriority.BelowNormal tr.Start() HaalUitverkorenen() If tr.ThreadState = Threading.ThreadState.Running Then tr.Abort() End If But I recieved quickly a exception because I put a string in a textbox during the excecution of the sub HaalUitverkorenen : the exception was telling : Cross-thread operation not valid: Control 'TextBox1' accessed from a thread other than the thread it was created on. the textbox was placed in the beginning of the design on my form what can I do? Show quoteHide quote "AMercer" <AMer***@discussions.microsoft.com> schreef in bericht news:5FA869AE-6E4A-4ECB-B062-49F03D224146@microsoft.com... >> I have a calculation program in vb.net who is running for let us say for >> more than a hour. >> When I will do meanwhile something els in a office program I see that my >> calculation program takes a great part (maybe 80% or more) of the >> processor >> time and I want that it is for both 50% when the office program is >> using >> the processor. >> Is this normal and can I do somthing in the code of my calculation >> program >> or is this simple impossible. >> Thanks for any response. > > For the thread(s) that do the calculating, set > thread.Priority = Threading.ThreadPriority.BelowNormal > Your calculation will relinquish the cpu to other processes (eg office) > and > their threads whenever the others make cpu demands. When other processes > are > idle, your calculation will use 100% cpu.
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> I have set the following commands in my program and it started obviously I see two things that look like problems. First, you do tr.Start() on a > well : > > Dim tr As New Thread(AddressOf HaalUitverkorenen) > tr.Priority = Threading.ThreadPriority.BelowNormal > tr.Start() > HaalUitverkorenen() > If tr.ThreadState = Threading.ThreadState.Running Then > tr.Abort() > End If > > But I recieved quickly a exception because I put a string in a textbox > during the excecution of the sub HaalUitverkorenen : > the exception was telling : > > Cross-thread operation not valid: Control 'TextBox1' accessed from a thread > other than the thread it was created on. > > the textbox was placed in the beginning of the design on my form > > what can I do? thread that will run at function HaalUitverkorenen(), and then your main thread also calls functionHaalUitverkorenen(). This looks to me like you will execute HaalUitverkorenen() twice, once on the new thread and once on the main thread. In the code fragment, I think all you need is Dim tr As New Thread(AddressOf HaalUitverkorenen) tr.Priority = Threading.ThreadPriority.BelowNormal tr.Start() Second, there is a issue with windows where code that operates on some controls has to execute on the same thread that the control execute on. So, once you run HaalUitverkorenen() on its own thread, it cannot manipulate forms and controls directly. There is a variety of written material on how to solve this problem in the .net help documentation under the topic of Invoke. The general idea is that your HaalUitverkorenen() thread can be made to execute gui code on the gui main thread by appropriate function calls. Yes, I had seen the first problem and the second I will try your
propositiion. But should it be not better to give the whole program at once a lower priority so tha it runs for 100% if there are no other programs and for let's say 10% if other programs have to use the processor. I don't know if this is possible and if it is, what is the solution (commands) for this? Thanks for any response Show quoteHide quote "AMercer" <AMer***@discussions.microsoft.com> schreef in bericht news:71AB14B1-4A51-40D6-A638-2F578EBE8EBD@microsoft.com... >> I have set the following commands in my program and it started obviously >> well : >> >> Dim tr As New Thread(AddressOf HaalUitverkorenen) >> tr.Priority = Threading.ThreadPriority.BelowNormal >> tr.Start() >> HaalUitverkorenen() >> If tr.ThreadState = Threading.ThreadState.Running Then >> tr.Abort() >> End If >> >> But I recieved quickly a exception because I put a string in a textbox >> during the excecution of the sub HaalUitverkorenen : >> the exception was telling : >> >> Cross-thread operation not valid: Control 'TextBox1' accessed from a >> thread >> other than the thread it was created on. >> >> the textbox was placed in the beginning of the design on my form >> >> what can I do? > > I see two things that look like problems. First, you do tr.Start() on a > thread that will run at function HaalUitverkorenen(), and then your main > thread also calls functionHaalUitverkorenen(). This looks to me like you > will execute HaalUitverkorenen() twice, once on the new thread and once on > the main thread. In the code fragment, I think all you need is > Dim tr As New Thread(AddressOf HaalUitverkorenen) > tr.Priority = Threading.ThreadPriority.BelowNormal > tr.Start() > > Second, there is a issue with windows where code that operates on some > controls has to execute on the same thread that the control execute on. > So, > once you run HaalUitverkorenen() on its own thread, it cannot manipulate > forms and controls directly. There is a variety of written material on > how > to solve this problem in the .net help documentation under the topic of > Invoke. The general idea is that your HaalUitverkorenen() thread can be > made > to execute gui code on the gui main thread by appropriate function calls. > But should it be not better to give the whole program at once a lower There is no way to guarantee 10% (or about 10%) cpu demand. Ready to run > priority so tha it runs for 100% if there are no other programs and for > let's say 10% if other programs have to use the processor. > I don't know if this is possible and if it is, what is the solution > (commands) for this? threads at higher priority win over threads at lower prioirty, and threads of equal priority share cpu equally. That is not a complete description of what windows does, but it is the way you should view it. I think it is better for the gui thread of your program to run at ordinary priority and the cpu bound calculation thread to run at BelowNormal priority. In this way, the calculation thread will use whatever cpu is available, and your app's gui will be just as responsive as any other app. 
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