If this doesn’t tell the Sony executives that they better get a killer app game out for its PlayStation 3 sooner rather than later, we don’t know what will. Over at the North Carolina State University an associate professor of computer science went out and bought eight PS3 units and then clustered them together to combine their processing power. Apparently the demos for “Resistance: Fall of Man” wasn’t enough to impress Dr. Frank Mueller about the PS3’s gaming ability, but he can get a decent level of supercomputing processing power out of …