Task Manager showing different CPU usage

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Pramit Kumar Biswas

Pramit Kumar Biswas

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Aug 25, 2015
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Hello everybody....Today during full scanning my computer with McAfee Antivirus the task manager shows 92% CPU usage but when I opened resource monitor and calculated all the processes , the total CPU usage came around 60%. (My computer contains no virus). During idle also the total usage by adding the processes never match the reading of task manager( sometimes processes adding shows 3% and task manager shows 1% during idle). Is this normal??? I just have a 3 month old PC. Help!!
 
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G
Sort by CPU instead of Average CPU, but the total will never match that column simply because unlike Average CPU, the CPU column is rounded. Several processes displayed as 0 could use .49 or less, but because you don't know, you obviously don't add them. Use the graph as it provides a better overview of the CPU usage. The CPU column is useful to identify processes that use a lot of resources, e.g., mbam.exe that I presume is actively scanning your system.
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Pramit Kumar Biswas

Pramit Kumar Biswas

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Aug 25, 2015
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I only added up the numbers shown by the processes in the CPU column and they were not matching the CPU usage. So in my above mentioned post, is that
normal?
 
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GhislainG

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Jul 16, 2008
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You mean the processes in Task Manager, not Resources Monitor? Even if you pause the refresh you can't get accurate results. You should instead rely on the graphs that also take into account the processor frequency. At idle 3% of a CPU at 0.79 GHz is less than 1% at full speed.
 
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Pramit Kumar Biswas

Pramit Kumar Biswas

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Aug 25, 2015
206
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4,690

Not from task manager, I noted it from resource monitor. During full scanning cpu usage in resource monitor was showing 92% and when I calculated it from processes in res.monitor it was 65%. So a difference of 27% is coming. So I am tensed.
 
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GhislainG

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Jul 16, 2008
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Please post a picture; on all the OS that I use (Windows 7, 8.1, 10, 2008 R2 and 2012 R2) it only shows an average per process or service; nowhere do I see the actual utilization. It looks like this on my systems: http://www.techrepublic.com/blog/the-enterprise-cloud/use-resource-monitor-to-monitor-cpu-performance/ How did you get yours to display CPU utilization per process or service?
 
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Pramit Kumar Biswas

Pramit Kumar Biswas

Reputable
Aug 25, 2015
206
0
4,690


I5UFI7.jpg

here is the image of my PC. See that the processes CPU usage is not matching the total CPU usage.
 
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GhislainG

Titan
Jul 16, 2008
23,962
5
74,965
Sort by CPU instead of Average CPU, but the total will never match that column simply because unlike Average CPU, the CPU column is rounded. Several processes displayed as 0 could use .49 or less, but because you don't know, you obviously don't add them. Use the graph as it provides a better overview of the CPU usage. The CPU column is useful to identify processes that use a lot of resources, e.g., mbam.exe that I presume is actively scanning your system.
 
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