Methods, apparatus, and computer program products are disclosed for clock signal synchronization among computers in a network, including designating, as a primary clock signal for all the computers in a network, a clock signal from one of the computers in the network; providing the primary clock signal, simultaneously and in parallel, from the computer whose clock signal is designated as the primary clock signal to all the other computers in the network; and providing the primary clock signal, simultaneously and in parallel, from each computer in the network to all computers in the network through multiplexers and phase locked loops, with the primary clock signal locked in phase across all the computers by a phase locked loop on each computer.