Scientific Computing Services completed the project to increase the PPA shared "bullet" cluster from 2864 to 4512 cores.  All hosts are connected to the SLAC network via 10Gb ethernet and there is a dedicated 40Gb Infiniband network for parallel applications.  This cluster is a major part of the public batch compute farm, available to all users with Unix accounts.   It is also the only parallel cluster available for general use at SLAC.