On 09-02-2015, at 4:53 PM, Eliot Miranda <eliot.miranda@gmail.com> wrote:
>
> No. The heartbeat is extremely cheap. It is the idle loop that calls ioRelinquishProcessorForMicroseconds which in turn calls aioSleepForUsecs which calls select:
>
Happy to be shown wrong. That means it most likely is morphic and/or any other tucked away processes. On a Pi it seems to be about 15% cpu time, so there is certainly some interest in reducing it!