llvm::SmallVector<ParsedDevice, 8> system_devices =
      FindMatchingDevices(devices, spec);
  if (system_devices.empty())
    return absl::InvalidArgumentError(
        absl::StrCat("no ", kDeviceTPUSystem, " devices found"));

  // Check that all system devices are part of the same job.
  const auto& job = system_devices[0].job;
  auto replica = system_devices[0].replica;