| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Utilization |
The percentage utilization of the spool work processes |
Percent
|
|
| Spool_work_procs |
The number of spool work processes |
Percent
|
Output requests are buffered in the dispatcher queue on the spool server until a free work process accepts them. A high value for this measure therefore, indicates the non-availability of idle work processes for servicing the output requests in the dispatcher queue. This, in turn, could be due to a heavy workload on the spool server.
|
| Queue_length |
The percentage of space in the dispatcher queue that has been used |
Percent
|
Output requests are buffered in the dispatcher queue on the spool server until a free work process accepts them. A high value for this measure therefore, indicates the non-availability of idle work processes for servicing the output requests in the dispatcher queue. This, in turn, could be due to a heavy workload on the spool server.
|
| Service_queue |
The percentage of space in the spool requests queue that has been utilized |
Percent
|
The spool requests queue takes output requests from the dispatcher queue when a free work process in the spool server accepts the output request. A high value here, once again indicates a heavy workload on the server, due to which very few work processes are free to accept the enqueued output requests.
|
| Private_service_queue |
The percentage of space being utilized in the special spool request queues for processing requests in sequence |
Percent
|
If a spool server has several spool work processes, output requests can overtake each other. To maintain the sequence of requests, there are special work process-specific request queues, each with requests for one particular output device.
|
| Service_queue_pages |
The number of pages in the spool requests queue |
Number
|
|
| Device_cache_used |
The percentage of the device cache in use |
Percent
|
The device cache contains device definitions and sever assignments for all work processes. Entries are taken into the cache as required, and can be removed again if the cache becomes full.
|
| Fixed_device_cache_used |
The percentage of space in the fixed device cache that is currently in use |
Percent
|
The fixed device cache contains information about the output devices for which there are requests in the host spool system that have not yet been reported as finished. The cache must therefore contain at least as many entries as the number of devices that can be concurrently used.
|
| Host_spool_list_used |
The percentage of space in the host spool requests list in use |
Percent
|
The host spool requests limit the number of requests in the host spool which can be managed with the spool service. To minimize database accesses, the list must be stored in shared memory. It deals with status queries for the current requests.
|