Methods, systems, and apparatus for cooling control in a datacenter. In one aspect, a method includes, for each processing device in a cluster of processing devices configured to perform a distributed task, wherein each processing device is thermally controlled by a cooling system that controls cooling to each processing device on an individual basis, determining whether the processing device is operating within a performance target for the cluster of processing devices; for each processing device determined to not be operating within the performance target for the cluster, generating a respective control signal to adjust the cooling delivery to the processing device to cause the performance of the processing device to be within the performance target for the cluster of processing devices; and for each processing device determined to be operating within the performance target for the cluster, maintaining the cooling delivery to the processing device.