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Windows 7: CPU Usage 100% -0%, 100% - 0 - Like a sine wave

29 Mar 2012   #1
dcshaker

Windows 7 Home Premium 64 bit
 
 
CPU Usage 100% -0%, 100% - 0 - Like a sine wave

Has anyone seen an issue in Windows 7 where my CPU usage goes from 0 to 100 then back and forth, like a sine wave? I had no apps running. If I reboot it becomes normal again. Ive tried to replicate what I was doing when I noticed it but nothing was found. This has happened 3 times in the last week. A pic of my Task Mgr illustrates.




Attached Images
CPU Usage 100% -0%, 100% - 0 - Like a sine wave-task-mgr.jpg 
My System SpecsSystem Spec
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29 Mar 2012   #2
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

hi and welcome to the forums

if you download this program and run it you will be able to see in very concise view all your running processors Process Explorer v15.13 By Mark Russinovich

LINK >>> Process Explorer

Quote:
introduction

Ever wondered which program has a particular file or directory open? Now you can find out. Process Explorer shows you information about which handles and DLLs processes have opened or loaded.

The Process Explorer display consists of two sub-windows. The top window always shows a list of the currently active processes, including the names of their owning accounts, whereas the information displayed in the bottom window depends on the mode that Process Explorer is in: if it is in handle mode you'll see the handles that the process selected in the top window has opened; if Process Explorer is in DLL mode you'll see the DLLs and memory-mapped files that the process has loaded. Process Explorer also has a powerful search capability that will quickly show you which processes have particular handles opened or DLLs loaded.

The unique capabilities of Process Explorer make it useful for tracking down DLL-version problems or handle leaks, and provide insight into the way Windows and applications work.


Attached Images
CPU Usage 100% -0%, 100% - 0 - Like a sine wave-brys-snap-01-29-march-2012-.png 
My System SpecsSystem Spec
29 Mar 2012   #3
dcshaker

Windows 7 Home Premium 64 bit
 
 

thanks, I have downloaded and will see what happens when it occurs again.
My System SpecsSystem Spec
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05 Apr 2012   #4
dcshaker

Windows 7 Home Premium 64 bit
 
 

Well, its happeded again and I ran process explorer but still couldnt figure out what was causing the cpu usage going up and down.
My System SpecsSystem Spec
05 Apr 2012   #5
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

if you open the cpu graph inside the procexp and leave it running at the peeks on the graph run your mouse cursor over and it will show what process is at that point
My System SpecsSystem Spec
06 Apr 2012   #6
dcshaker

Windows 7 Home Premium 64 bit
 
 

Thanks, I'll do that next time. Pretty wierd though.
My System SpecsSystem Spec
16 Apr 2012   #7
dcshaker

Windows 7 Home Premium 64 bit
 
 

Its happened again. I checked and the process that is running is "interupts" - Hardware Interupts - DPC's. Im not a geek so I dont know what that is or why its happening.
My System SpecsSystem Spec
17 Apr 2012   #8
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

Quote:
An interrupt is a message from a device, such as the keyboard, to the CPU, telling it to immediately stop whatever it is currently doing and do something else. In general, a very high rate of interrupts might indicate a disk or a network adapter that needs upgrading or replacing. Test your components and rule out a hardware problem.
can you post a screenshot of process explorer and right click on interrupts and click on performance graph tab and screenshot this please.

My System SpecsSystem Spec
18 Apr 2012   #9
dcshaker

Windows 7 Home Premium 64 bit
 
 

Here is the interupt and performance graph


Attached Thumbnails
CPU Usage 100% -0%, 100% - 0 - Like a sine wave-interupts.jpg  
My System SpecsSystem Spec
18 Apr 2012   #10
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

yeah should not be that high check all your devices external hard drives mouse keyboard usb wireless adapters etc leave the procexp running and the performance chart and unplug devices to see if it drops down; check all drivers for updates

Quote:
An interrupt is a message from a device, such as the keyboard, to the CPU, telling it to immediately stop whatever it is currently doing and do something else. In general, a very high rate of interrupts might indicate a disk or a network adapter that needs upgrading or replacing. Test your components and rule out a hardware problem.
My System SpecsSystem Spec
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