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Activity monitor is not always good if you want to see what is keeping your computer busy for a period of time.

For example if you have gcc executed hundred of times it will take a lot of CPU power but the overall CPU time consumed by gcc will not appear. I'm looking for a solution that is able to count and summarize application usage so I can know that how the cpu was used.

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I'm a huge fan of Bjango's iStat menus, which allows one to conveniently place various monitors (CPU, disk usage, network up & down, battery, memory, temperature sensors...) up in the menu bar. Each one can be pulled down like a menu for additional details. It's a $16 app. You can try before you buy.

Edit: it looks like they have released another monitoring application called MiStat that is a separate app instead of living in the menu bar. This allows them to place it in the Mac App Store. It's available for a $4.99.


Edit: I'm sorry, I must have not read your question carefully enough before I posted. I do not know of any GUI tool that is able to aggregate CPU time being consumed by several similar processes as you describe. The best idea that I can think of would be to write a script that wraps the top or ps commands and adds up processes that match a regular expression. This strikes me as a market opportunity for a nice utility. Could you describe a little more of how you would like such a thing to behave?

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For a long time, I used Ipulse from IconFactory until my company's IT department clamped down on software installs. It offers up a lot of information about the Mac in a small space. It is a visual tool first that then allows for in-depth, text-based analysis by hovering your mouse over it. It's a bit dated (it still shows Mac OS 10.4 as the minimum requirement), so I suggest you demo it to make sure it still works on your Macs.

  • Sorry but ipulse does not summarize cpu usage over time, in fact it looks to be only a fancy vizualization over what topvprovides. – sorin Mar 16 '11 at 16:37
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I believe you can use Apple's Instruments' Activity Monitor to record what you want. It's not an always-on solution, but would let you diagnose particular intervals.

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