Hi, All!
We are developing one app for windows 95/98/Me/NT4.0/2000/XP/2003 using
Visual C++ 6.0. We need to set the % of CPU Usage to app process. Is there
an API to set % of CPU Usage? Can Someone help us?
Thanks in advance.
11  2488 
Paulo Eduardo wrote: Is there an API to set % of CPU Usage?
No.
What are you trying to do?
If your prcess has an endless-loop, then remove it and switch to
event-driven architecture...
If the work of your process is not important, then reduce the priority.
See: SetPriorityClas s(..., BELOW_NORMAL_PR IORITY_CLASS) http://msdn.microsoft.com/library/en...orityclass.asp
--
Greetings
Jochen
My blog about Win32 and .NET http://blog.kalmbachnet.de/
Hi, Jochen
Actually, if I understood you, we are using an event-driven architecture,.
We are using in it c functions and c++ methods that use WMI service. We are
not using one endless loop (for (;;)) too. Is some local of source code we
need to access fixed drives (C:,E:) for search files in them (subdirectories
too). Is it possible to control the cpu usage by process creating one thread
that control the cpu usage of process? For example, If process is using more
than 20% of CPU, the 'thread control' sleep the process for 1s.
Thanks in advance.
"Jochen Kalmbach [MVP]" wrote: Paulo Eduardo wrote:
Is there an API to set % of CPU Usage?
No.
What are you trying to do?
If your prcess has an endless-loop, then remove it and switch to
event-driven architecture...
If the work of your process is not important, then reduce the priority.
See: SetPriorityClas s(..., BELOW_NORMAL_PR IORITY_CLASS)
http://msdn.microsoft.com/library/en...orityclass.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
Hi Paulo! Actually, if I understood you, we are using an event-driven architecture,.
We are using in it c functions and c++ methods that use WMI service. We are
not using one endless loop (for (;;)) too. Is some local of source code we
need to access fixed drives (C:,E:) for search files in them (subdirectories
too). Is it possible to control the cpu usage by process creating one thread
that control the cpu usage of process? For example, If process is using more
than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your priority?
To get the process/thread-times you can use
See: GetProcessTimes http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors...
See: GetSystemInfo http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET http://blog.kalmbachnet.de/
Jochen,
our app will be running in background (background process). Actually, we are
using the default settings for process. The app run when user log on in
windows. Then, for avoid to increase the cpu usage by process, we are trying
to control the cpu usage. Do you consider that only priority will resolve
this problem?
Thanks a lot in advance.
"Jochen Kalmbach [MVP]" wrote: Hi Paulo!
Actually, if I understood you, we are using an event-driven architecture,.
We are using in it c functions and c++ methods that use WMI service. We are
not using one endless loop (for (;;)) too. Is some local of source code we
need to access fixed drives (C:,E:) for search files in them (subdirectories
too). Is it possible to control the cpu usage by process creating one thread
that control the cpu usage of process? For example, If process is using more
than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your priority?
To get the process/thread-times you can use
See: GetProcessTimes
http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes
http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors...
See: GetSystemInfo
http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
Paulo Eduardo wrote: Jochen,
our app will be running in background (background process). Actually, we are
using the default settings for process. The app run when user log on in
windows. Then, for avoid to increase the cpu usage by process, we are trying
to control the cpu usage. Do you consider that only priority will resolve
this problem?
Thanks a lot in advance.
"Jochen Kalmbach [MVP]" wrote:
Hi Paulo!
Actually, if I understood you, we are using an event-driven architecture,.
We are using in it c functions and c++ methods that use WMI service. We are
not using one endless loop (for (;;)) too. Is some local of source code we
need to access fixed drives (C:,E:) for search files in them (subdirectories
too). Is it possible to control the cpu usage by process creating one thread
that control the cpu usage of process? For example, If process is using more
than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your priority?
To get the process/thread-times you can use
See: GetProcessTimes
http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes
http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors. ..
See: GetSystemInfo
http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
One solution is to: Run at a low priority, see how much CPU time you
used in the last 100 ms (or other reasonable interval) using the APi
sugegsted in this thread and then sleep for the appropriate time if it
exceeded your limit of much much you wanted to load the machine.
Specifically for managing competing processes'resou rce consumption on
Server 2003 Enterprise and ata Center editions, there is WSRM, you can
read up on what it is and how it works at: http://www.microsoft.com/technet/pro...556306e91.mspx
Ronald Laeremans
Visual C++ team
No, it won't, if this is the only process in the system that has runnable
threads, nothing will stop the thread to consume 100% of the CPU, if on the
other hand other applications are running and their threads have higher
priority, your lower priority threads will get much less CPU resources, but
be carefull with this, on consumer windows this can lead to thread
starvation.
I'm also not clear on what your actual CPU consumption is, and why you need
to restrict this while it will probably be done automatically when there are
other programs running.
Willy.
"Paulo Eduardo" <Pa**********@d iscussions.micr osoft.com> wrote in message
news:36******** *************** ***********@mic rosoft.com... Jochen,
our app will be running in background (background process). Actually, we
are
using the default settings for process. The app run when user log on in
windows. Then, for avoid to increase the cpu usage by process, we are
trying
to control the cpu usage. Do you consider that only priority will resolve
this problem?
Thanks a lot in advance.
"Jochen Kalmbach [MVP]" wrote:
Hi Paulo!
> Actually, if I understood you, we are using an event-driven
> architecture,.
> We are using in it c functions and c++ methods that use WMI service. We
> are
> not using one endless loop (for (;;)) too. Is some local of source
> code we
> need to access fixed drives (C:,E:) for search files in them
> (subdirectories
> too). Is it possible to control the cpu usage by process creating one
> thread
> that control the cpu usage of process? For example, If process is using
> more
> than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your
priority?
To get the process/thread-times you can use
See: GetProcessTimes
http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes
http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors...
See: GetSystemInfo
http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
Hi, Willy
Actually, the app process are using almost 40% of cpu usage. About % Cpu
Usage, we need this for avoid to decrease performance of system, and
consequently the user interactivity with it(slowly,freez e,etc). Also, we
will go to develop one part of system that scan fixed drives (c:,e:) and,
probably this will consume more cpu.
Thanks a lot in advance.
Best Regards,
Paulo Eduardo.
"Willy Denoyette [MVP]" wrote: No, it won't, if this is the only process in the system that has runnable
threads, nothing will stop the thread to consume 100% of the CPU, if on the
other hand other applications are running and their threads have higher
priority, your lower priority threads will get much less CPU resources, but
be carefull with this, on consumer windows this can lead to thread
starvation.
I'm also not clear on what your actual CPU consumption is, and why you need
to restrict this while it will probably be done automatically when there are
other programs running.
Willy.
"Paulo Eduardo" <Pa**********@d iscussions.micr osoft.com> wrote in message
news:36******** *************** ***********@mic rosoft.com... Jochen,
our app will be running in background (background process). Actually, we
are
using the default settings for process. The app run when user log on in
windows. Then, for avoid to increase the cpu usage by process, we are
trying
to control the cpu usage. Do you consider that only priority will resolve
this problem?
Thanks a lot in advance.
"Jochen Kalmbach [MVP]" wrote:
Hi Paulo!
> Actually, if I understood you, we are using an event-driven
> architecture,.
> We are using in it c functions and c++ methods that use WMI service. We
> are
> not using one endless loop (for (;;)) too. Is some local of source
> code we
> need to access fixed drives (C:,E:) for search files in them
> (subdirectories
> too). Is it possible to control the cpu usage by process creating one
> thread
> that control the cpu usage of process? For example, If process is using
> more
> than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your
priority?
To get the process/thread-times you can use
See: GetProcessTimes
http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes
http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors...
See: GetSystemInfo
http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
Hi, Jochen
In your response you mentioned 'resolution'. Are you speaking about time
slice of a process?
Thanks a lot in advance.
Best regards,
Paulo Eduardo.
"Jochen Kalmbach [MVP]" wrote: Hi Paulo!
Actually, if I understood you, we are using an event-driven architecture,.
We are using in it c functions and c++ methods that use WMI service. We are
not using one endless loop (for (;;)) too. Is some local of source code we
need to access fixed drives (C:,E:) for search files in them (subdirectories
too). Is it possible to control the cpu usage by process creating one thread
that control the cpu usage of process? For example, If process is using more
than 20% of CPU, the 'thread control' sleep the process for 1s.
Why do you want to limit your CPU usage? Why not just lower your priority?
To get the process/thread-times you can use
See: GetProcessTimes
http://msdn.microsoft.com/library/de...ocesstimes.asp
or
See: GetThreadTimes
http://msdn.microsoft.com/library/en...ocesstimes.asp
You should be aware, that the resolution is about than 10-15 ms...
To implement it correctly you also need to know the number of (logical)
processors...
See: GetSystemInfo
http://msdn.microsoft.com/library/en...systeminfo.asp
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
The CPU usage is managed by the OS. Just reduce the priority to increase
the system performance. The system does an automatic load balancing. If
nothing else is running, your application will use close to 100% CPU,
but as soon as other processes come up, it may go down to 0%. I managed
to achieve extremely good results with low priority threads. The thread
works as hard as possible when it gets a chance, but it never takes away
any significant CPU time from other processes.
The actual CPU usage always depends on the current load. If you're only
tunning one application, it will have a high CPU usage. The lower the
priority, the lower the CPU usage during heavy load situations.
Hyperthreading helps significantly too.
Tom
Paulo Eduardo wrote: Hi, Willy
Actually, the app process are using almost 40% of cpu usage. About % Cpu
Usage, we need this for avoid to decrease performance of system, and
consequently the user interactivity with it(slowly,freez e,etc). Also, we
will go to develop one part of system that scan fixed drives (c:,e:) and,
probably this will consume more cpu.
Thanks a lot in advance.
Best Regards,
Paulo Eduardo. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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