SELECTING COMPUTING RESOURCES

Systems and methods are described for distributing pool resources. One method includes maintaining a plurality of groups of computing resources, wherein each group of the plurality of groups includes computing resources that share a respective combination of resource characteristics; receiving a first request to perform a first test on a computing resource; determining, from the plurality of groups of computing resources, a subset of groups of computing resources that include a respective combination of resource characteristics that satisfy the required characteristics of the first test; shuffling the subset of groups and selecting a first group from the shuffled subset of groups; selecting an available computing resource from the first group; and causing the first test to be performed on the selected available computing resource from the first group.