Did you try clicking “Prevent app nap” in the “Info” inspector for the app?
Paul > On May 10, 2016, at 10:26 AM, Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> > wrote: > > Hi all, > > I’m hoping somebody can help me work out how to protect my code against the > effects of “app nap”. This code is driving a scientific experiment, > unattended, and it is catastrophic when the OS decides that my timers running > at 10Hz should only be fired every 10 seconds or so… which it turns out has > been happening! > > I have been calling [[NSProcessInfo processInfo] beginActivityWithOptions:…] > from -applicationDidFinishLaunching. I know that a blanket declaration like > this would typically be considered poor practice, but honestly if the program > is running then the experiment is running and I need the OS not to mess with > my timings to that extent. Anyway, that seems to help stop the timer > weirdness. However, I was a bit surprised to find that I seem to need to > explicitly retain the object I get back [this is non-ARC code…] if I want my > request to remain in effect or even for the object to remain allocated to > allow me to call endActivity at a later point. I wasn’t expecting to have to > retain it, and there’s no explicit mention of that in the headers, so I just > wanted to check that is to be expected, or whether I may be doing something > weirdly wrong. > > The other thing I wanted to ask relates to creating a timer using > dispatch_source_create. I have tried to be flexible where I can in terms of > providing a leeway for non-critical timers, but others I really want to have > control over. For these I am specifying DISPATCH_TIMER_STRICT, also in the > hope of dissuading the OS from trying to be too clever for its own good. I > notice that using this flag leads to dispatch_source_create failing on > 10.8.5, which I presume is because the flag is not recognised (or needed) on > that OS version. My question here is what is the most appropriate way of > identifying in code whether this feature is available, to ensure I only set > it when it will be accepted. > > Any help much appreciated! > Cheers > Jonny.
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