COSMOS is an event-driven monitor for recording detailed monitored data for the specific performance diagnosis of BS2000 systems. COSMOS is an SM2 monitoring program integrated into openSM2 and as such can be controlled using SM2 commands.
COSMOS records the entire course of the system events over time. Approx. 90 different types of event can be registered, e.g. start and end of an I/O operation, system calls (SVCs), and generation and termination of tasks. Each event is identified by a 4-character name. To record the events, COSMOS interfaces, so-called “hooks”, are implemented at various places in the system. Depending on the parameters selected the hook is “opened”, i.e. the data capture code is activated each time the relevant event occurs and a record is written. When COSMOS is terminated, all hooks open at this point are closed.
The data can be collected for all tasks or for tasks selected according to specific criteria (user ID, category, job name or TSN).
The monitored data recorded is written to output files (to tape or disk). Special analysis programs are available for analyzing the COSMOS output files. Generally specialist knowledge is required to evaluate and analyze COMOS measurements.