Activity Monitor "clear CPU history"

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Activity Monitor "clear CPU history"

In Mojave 10.14.6 the Activity Monitor menu View:Clear CPU History doesn't seem to do anything. I'm trying to re-zero the CPU Time accumulation on all of the displayed processes. I don't know what the "time zero" is for the history shown in the table, and I would like to start it over in order to track com.apple.photos.ImageConversionService and photolibraryd processes. Trying to better understand how Photos scans the photoslibrary to identify faces and create memories.

MacBook Pro 15”, macOS 10.14

Posted on Dec 4, 2019 9:43 AM

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Answer 1

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leroydouglas

Level 10

200,082 points

Dec 4, 2019 10:09 AM in response to ThompsonTB

The only "clear CPU history" is clearing is the GUI.

From the Activity Monitor >Window>CPU History of all cores. (Clears the current CPU history graph)

You can click open any process and run a sample, look at stats— however I aqm unclear if this gets you any closer(?)

ref: https://discussions.apple.com/thread/8345845

ref: How to use Activity Monitor on your Mac - Apple Support

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Answer 2

leroydouglas

Level 10

200,082 points

Dec 4, 2019 10:22 AM in response to ThompsonTB

To add, from Terminal using the top command for a particular PID -display and update sorted information about processes

ref from terminal, copy and paste:

man top | more

from AM ex screen shot above pid is 15599 (com.apple.photos.ImageConversionService)

top -pid 15599

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Answer 3

ThompsonTB Author

Level 1

8 points

Dec 4, 2019 11:17 AM in response to leroydouglas

Thank you for this information and your helpful screenshots. As to my question on how to clear the displayed accumulators for cpu (and also, btw, disk read & write), I will try rebooting and see if that zeros them - if these photos-related processes ever finish whatever it is that they are doing!

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Activity Monitor "clear CPU history"

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