Who's in control

I am wondering, who is in control? Not philosophically, but in Pakistan. Is the President the ruler? Is the Prime Minister the ruler? How do I check? I guess if I asked them to get rid of the shortage of gasoline in the country for just one hour, if they were in control, they could do it. Or maybe at least for fifteen minutes. Heck, if they can get rid of the shortage for even one minute at will, I'd accept that they are in control. But they can't. So, who really is in charge?