RECONFIGURABLE COMPUTING PODS USING OPTICAL NETWORKS WITH ONE-TO-MANY OPTICAL SWITCHES

Methods, systems, and apparatus, including an apparatus for generating clusters of building blocks of compute nodes using an optical network. In one aspect, a method includes receiving data specifying requested compute nodes for a computing workload. The data specifies a target arrangement of the nodes. A subset of building blocks of a superpod is selected. A logical arrangement of the subset of compute nodes that matches the target arrangement is determined. A workload cluster of compute nodes that includes the subset of the building blocks is generated. For each dimension of the workload cluster, respective routing data for two or more OCS switches for the dimension is configured. One-to-many switches are configured such that a second compute node of each segment of compute nodes is connected to a same OCS switch as a corresponding first compute node of a corresponding segment to which the second compute node is connected.