Coupling Facility Requests
A request to a CF structure is of one of two kinds:
- Synchronous (sync) requests. When a z/OS system issues a request it waits for the request to complete, actively "spinning" on one of its own processors. Sync requests are quick but the response time is the same as the coupled system's "spinning" CPU loss. So Sync requests are relatively expensive in CPU terms - from the coupled system's perspective.
- Asynchronous (async) requests. When a z/OS system issues a request it doesn't wait for the request to complete. Async requests are slower than sync requests (as they have a lower priority in the CF) but don't lead to the coupled system's processor "spinning".
Exploiting z/OS applications explicitly issue CF requests as synch or asynch.
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