Particular embodiments execute tasks to measure performance in a computing system. The method uses a master computing device and helper client computing devices. The helper client computing devices may be situated in a pool where the helper client computing devices are available to help a master computing device to perform a task. When the master computing device wants to perform a task, the master computing device may send a message to the pool requesting help with a task. Helper client computing devices can respond to the message when the helper clients are available to join in groups to process tasks. Once the master computing device configures a group with helper client computing devices that responded to the message, the master computing device and the helper client computing devices perform the task together.