HP 3000 Manuals HP 3000 Manuals
Disk Space Requirements The amount of disk space required for the HP SPT/XL logfile can vary widely. This wide variation is due to the fact that HP SPT/XL logs information at every intrinsic call and return. Therefore, the size of the logfile depends on the rate that intrinsics are called by the application being monitored. Different applications will call intrinsics at different rates. Batch programs will call more intrinsics per hour than online programs, but a rough guideline is 400 kilobytes per 1000 intrinsic calls. An example situation is the order entry application used in the HP SPT/XL User's Manual: Analysis Software. This application with a 10-second think time per terminal read would require approximately 400 kilobytes of disk space per minute. After the data has been collected, the end-of-file of the logfile is reduced to the minimum size possible. However, the file limit is still very large. The analysis of the logfile will require additional space in the file to restructure the data from a chronological organization to a transaction-based organization. The amount of additional disk space required for the analysis phase will vary depending on how many transactions are defined. As a rule-of-thumb, the restructured logfile will be twice the size of an unprocessed logfile (one that has never been analyzed). Once the logfile has been through its initial restructuring, its size may increase or decrease slightly if transactions are redefined.