Forcing a process to sleep
in [Win32 Kernel]
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From: Bart on 25 Jun 2008 05:42 Hello, I have an application that is constantly running at 100% CPU and causing everything to be sluggish. Another GUI application runs at the same time and needs to be responsive. I do not have sources for either of these applications. Now, reducing the priority of the CPU hogging process does not help much. Normally, the GUI application should only yield the CPU when it doesn't have any more events to process, but since I don't have the sources I can't say for sure. Anyhow, I would like to write my own fix for this situation. I was wondering if there is any way to force another process to sleep for a few milliseconds or limit the amount of CPU time it gets. Is such a thing even possible? Thanks.
From: roger.orr on 25 Jun 2008 05:55 On Jun 25, 9:42 am, Bart <bart.kowal...(a)gmail.com> wrote: > Hello, > > I have an application that is constantly running at 100% CPU and > causing everything to be sluggish. Another GUI application runs at the > same time and needs to be responsive. I do not have sources for either > of these applications. Now, reducing the priority of the CPU hogging > process does not help much. Normally, the GUI application should only > yield the CPU when it doesn't have any more events to process, but > since I don't have the sources I can't say for sure. > > Anyhow, I would like to write my own fix for this situation. I was > wondering if there is any way to force another process to sleep for a > few milliseconds or limit the amount of CPU time it gets. Is such a > thing even possible? > > Thanks. It is possible -- one way would be to use SuspendThread() / ResumeThread() on the errant process. This sort of thing is obviously a bit of a 'last resort'! Roger.
From: RFOG on 25 Jun 2008 06:23 You only need to put at least one Sleep(<milliseconds>) on each offending process into thread loop. <milliseconds> depends on the priority of your thread, but putting 1 it is enough to give a chance to other windows apps. void MyThread(DWORD) { while(!terminate) { Sleep(1); //Do work } } "Bart" <bart.kowalski(a)gmail.com> escribi� en el mensaje de noticias news:1d8576f4-de2d-4a45-b4d6-eafd510e4607(a)m3g2000hsc.googlegroups.com... > Hello, > > I have an application that is constantly running at 100% CPU and > causing everything to be sluggish. Another GUI application runs at the > same time and needs to be responsive. I do not have sources for either > of these applications. Now, reducing the priority of the CPU hogging > process does not help much. Normally, the GUI application should only > yield the CPU when it doesn't have any more events to process, but > since I don't have the sources I can't say for sure. > > Anyhow, I would like to write my own fix for this situation. I was > wondering if there is any way to force another process to sleep for a > few milliseconds or limit the amount of CPU time it gets. Is such a > thing even possible? > > Thanks. -- Microsoft Visual C++ MVP ======================== Mi blog sobre programaci�n: http://geeks.ms/blogs/rfog Momentos Leves: http://momentosleves.blogspot.com/ Cosas m�as: http://rfog.blogsome.com/ Libros, ciencia ficci�n y programaci�n ======================================== Cualquier problema sencillo se puede convertir en insoluble si se celebran suficientes reuniones para discutirlo. -- Regla de Mitchell.
From: Bart on 25 Jun 2008 06:42 Like I wrote in my post, I do not have the source code of the offending process. Thanks. On Jun 25, 12:23 pm, "RFOG" <n...(a)mail.com> wrote: > You only need to put at least one Sleep(<milliseconds>) on each offending > process into thread loop. > > <milliseconds> depends on the priority of your thread, but putting 1 it is > enough to give a chance to other windows apps. > > void MyThread(DWORD) > { > while(!terminate) > { > Sleep(1); > //Do work > } > > } > > "Bart" <bart.kowal...(a)gmail.com> escribió en el mensaje de noticiasnews:1d8576f4-de2d-4a45-b4d6-eafd510e4607(a)m3g2000hsc.googlegroups.com... > > > > > Hello, > > > I have an application that is constantly running at 100% CPU and > > causing everything to be sluggish. Another GUI application runs at the > > same time and needs to be responsive. I do not have sources for either > > of these applications. Now, reducing the priority of the CPU hogging > > process does not help much. Normally, the GUI application should only > > yield the CPU when it doesn't have any more events to process, but > > since I don't have the sources I can't say for sure. > > > Anyhow, I would like to write my own fix for this situation. I was > > wondering if there is any way to force another process to sleep for a > > few milliseconds or limit the amount of CPU time it gets. Is such a > > thing even possible? > > > Thanks. > > -- > Microsoft Visual C++ MVP > ======================== > Mi blog sobre programación:http://geeks.ms/blogs/rfog > Momentos Leves:http://momentosleves.blogspot.com/ > Cosas mías:http://rfog.blogsome.com/ > Libros, ciencia ficción y programación > ======================================== > Cualquier problema sencillo se puede convertir en insoluble si se celebran > suficientes reuniones para discutirlo. > -- Regla de Mitchell.
From: Stefan Kuhr on 25 Jun 2008 06:40
Hello Bart, Bart wrote: > Hello, > > I have an application that is constantly running at 100% CPU and > causing everything to be sluggish. Another GUI application runs at the > same time and needs to be responsive. I do not have sources for either > of these applications. Now, reducing the priority of the CPU hogging > process does not help much. Normally, the GUI application should only > yield the CPU when it doesn't have any more events to process, but > since I don't have the sources I can't say for sure. > > Anyhow, I would like to write my own fix for this situation. I was > wondering if there is any way to force another process to sleep for a > few milliseconds or limit the amount of CPU time it gets. Is such a > thing even possible? > > Thanks. Write a program that starts this process and after starting it, enumerates that processes threads in a loop (using toolhelper API), while this child process is running. For each enumerated thread, do a suspend and after a short while a resume. For this to work you have to open the thread with OpenThread (THREAD_SUSPEND_RESUME) which for this approach to work has to work across process boundaries (which I never tried, so this approach may fail). You might give that a try. If it is the primary thread of the process that is responsible for the CPU utilization, things are much easier: You get that thread's handle via CreateProcess. -- Stefan |