How busy is the CPU?

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HaraldK

Different, slightly unrelated question:
I tried to use

var led1=flow(D13);
setInterval(led1(0.01),2);

but I get an error:

>setInterval(led1(0.01),2);
=undefined
Uncaught Error: Function or String not supplied!
 at line 1 col 25
setInterval(led1(0.01),2);

Anyone an idea why that does not work? led1 is a function after all when I use it as led1()...