Well, the API output will tell you that.
Also on Linux or Mac running 'top' in a terminal will tell you that also.
On Mac the docs mentions something to try.
I run these with no issues on the latest version of Kano's cgminer.
cgminer.exe -o stratum+tcp://solo.ckpool.org:3333 -u BTC.WORKERNAME -p x --gekko-start-freq 350 --gekko-compacf-freq 580 --gekko-mine2 --gekko-tune2 60 --suggest-diff 3000