TASM must make choices on a busy system when demand for resources exceeds availability. Throttles are TASM rules that limit the number of requests, sessions, or load utilities that can run at the same time. Throttles help improve the performance of all requests by reducing resource contention. If a throttle threshold is exceeded, TASM either rejects the work or delays it until the system is less busy. Throttles do not affect work that is already running.
- The entire system
- Specific workloads or groups of workloads
- Virtual partitions
- Utility jobs
System throttles can be active without workload throttles, and vice versa. TASM can also use system and workload throttles together. One request could be under the control of both a system throttle and a workload throttle.
Use workload throttles primarily to prevent too many low-priority requests from running at once, leaving no resources for higher-priority requests.