CPU modes
This section shows a breakdown of CPU active TCB observations by mode of CPU execution. These modes are not all mutually exclusive. For example, execution in Problem State could also be counted as execution in AMODE 31.
| Under heading | This is displayed |
|---|---|
| CPU Active | The number of observations of CPU Active TCBs. This value could be higher than the number of CPU Active samples because each CPU Active TCB is counted. Two or more TCBs could be serviced concurrently by separate CPUs. The percentage value indicates the ratio of the total number of CPU Active samples to the total number of samples completed so far. The first histogram represents this percentage and shows the proportion of the overall measurement time for which CPU activity was observed. The second sample count shows the number of CPU Active TCB observations in the current time slice. |
| Supv Mode | The number of CPU Active TCB observations in which execution was in Supervisor Mode. The percentage value indicates the ratio of the number of Supervisor Mode observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in Supervisor Mode. The second count shows the number of Supervisor Mode CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in Supervisor Mode in this time slice. |
| Prob Mode | The number of CPU Active TCB observations in which execution was in Problem Mode. The percentage value indicates the ratio of the number of Problem Mode observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in Problem Mode. The second count shows the number of Problem Mode CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in Problem Mode in this time slice. |
| In SVC | The number of CPU Active TCB observations in which execution was in a Supervisor Call. The percentage value indicates the ratio of the number of SVC execution observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in a Supervisor Call. The second count shows the number of Problem Mode CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in SVC execution in this time slice. |
| AMODE 24 | The number of CPU Active TCB observations in which execution was in 24 bit addressing mode. The percentage value indicates the ratio of the number of AMODE 24 observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in AMODE 24. The second count shows the number of AMODE 24 CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in AMODE 24 in this time slice. |
| AMODE 31 | The number of CPU Active TCB observations in which execution was in 31 bit addressing mode. The percentage value indicates the ratio of the number of AMODE 31 observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in AMODE 31. The second count shows the number of AMODE 31 CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in AMODE 31 in this time slice. |
| AMODE 64 | The number of CPU Active TCB observations in which execution was in 64 bit addressing mode. The percentage value indicates the ratio of the number of AMODE 64 observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in AMODE 64. The second count shows the number of AMODE 64 CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in AMODE 64 in this time slice. |
| User key | The number of CPU Active TCB observations in which execution was in user storage key (Key 8). The percentage value indicates the ratio of the number of user key observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in user key. The second count shows the number of user key CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in user key in this time slice. |
| System key | The number of CPU Active TCB observations in which execution was in system storage key (not key 8). The percentage value indicates the ratio of the number of system key observations to the number of CPU Active observations. The first histogram represents this percentage and shows the proportion of the overall CPU time for which CPU activity was observed to be in system key. The second count shows the number of system key CPU Active observations in the current time slice. The histogram represents the proportion of CPU time in system key in this time slice. |