Hp Integrity NonStop J-Series Manuel d'utilisateur télécharger pdf (Page 128)

Guardian Performance Analyzer (GPA) User Guide – (544541-006) Page 128 of 131

Glossary

#OUT

The GPA output file.

blocked request

A request that cannot be processed because another application has blocked access to a

record or file.

cache

A portion of memory used to store frequently-accessed information in order to save the

time otherwise required for disk I/O operations.

cache call

A request for disk data expected to be found in cache.

cache fault

An event that occurs when a disk process expects to find a data block in cache and

discovers that the memory manager has removed it.

cache hit

A successful retrieval of data from cache.

disk queue time

Average amount of time spent waiting for a disk process to service a request.

disk volume queuing

A buildup of disk I/O requests waiting to be completed.

dispatch

An event representing the allocation of CPU cycles to a process.

dynamic process control block

A Process Control Block (PCB) used for a process whose execution life is shorter than the

measurement period analyzed by GPA.

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Hp Integrity NonStop J-Series Manuel d'utilisateur Page 128