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miacomet Jun 25, 2013 10:14 PM
question about Activity Monitor CPU Usage cores
So Activity monitor measures CPU Usage in a nifty little rolling series of green and red dots piled on top of each other to measure the amount of CPU usage. It looks a little bit like a stock ticker.

On systems with more than one core, it has one of these CPU usage graphs for each core.

See: OS X: Activity Monitor shows one CPU Usage graph on systems with more than four cores

But my 15" rMBP i7 with 4 cores only shows one graph in the activity monitor.
And my 11" MBA i7 with 2 cores shows four graphs in the activity monitor.

Can anyone explain to me what is the reason for this discrepancy? :confused::confused::confused: Thanks!
P Jun 26, 2013 05:20 AM
Both your Macs have Hyperthreading, a feature that makes each processor core appear as two to the operating system. To the operating system, your 11" MBA has 4 cores and your MBP has 8. Presumably Activity Monitor defaults to only showing one graph when you have 8 cores, because it would confusing otherwise. There's probably a setting to override it in one of the menus.
miacomet Jun 26, 2013 08:33 AM
Ah, ha. THX!!!
Waragainstsleep Jun 28, 2013 04:34 AM
My 8 core Xserve shows all 8 cores.
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