CPU activity
This section shows sample counts for the overall measurement and for the current time slice. These are categorized as CPU Active, WAIT and Queued.
| Under heading | This is displayed |
|---|---|
| Samples | The number of samples performed in the overall measurement and in the time slice. The percentage shown in the Overall CPU Activity section represents the ratio of the number of samples completed to the number of samples requested. |
| CPU Active | The number of samples done in which one or more CPUs were executing instructions in the measured region. 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 in which CPU activity was observed. The second sample count shows the number of CPU Active samples in the current time slice. The second histogram shows the proportion of the current time slice in which CPU activity was observed. |
| CPU WAIT | The number of samples done in which all TCBs were in WAIT (non dispatchable) state. The percentage value indicates the ratio of the total number of CPU WAIT 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 in which all TCBs were in WAIT state. The second sample count shows the number of CPU WAIT samples in the current time slice. The second histogram shows the proportion of the current time slice in which all TCBs were observed to be in WAIT state. |
| Queued | The number of samples done in which no TCBs were CPU active and at least one TCB was dispatchable. This indicates a state in which work was not being done in the measured region because no CPU (or memory) was available. The percentage value indicates the ratio of the total number of Queued 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 in which a TCB was dispatchable and not serviced. The second sample count shows the number of Queued samples in the current time slice. The second histogram shows the proportion of the current time slice in which one or more TCBs was dispatchable and not serviced. |