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3.5 Histogram Zoomable Window

Figure 3.22: A histogram window of the whole duration shown in Figure 3.9.
Image histogram_state_all_cumu_excl

The Histogram window is created through clicking the statistics button located in the middle of Duration Info Box shown in Figure 3.18. In Figure 3.22, the histogram window is created for the whole duration of the timeline canvas in Figure 3.9, i.e same duration as the complet slog2 file. In general, the total duration of the histogram canvas is the same as the duration marked by the Duration Info Box so that the histogram window functions like a graphical display of statistical summary of the duration of interest. For instance, it is obvious from Figure 3.22 that the yellow state, it is MPI_Barrier in this case, cumulatively takes up the most time. This is especially true in the last timeline.

Since Histogram window is also a zoomable window like Timeline window, a lot of features like those described in section 3.4.1 for Timeline window are available for Histogram window as well, e.g. dragged-zoom, grasp and scroll, instant zoom in/out, easy vertical expansion of timeline, cut and paste of timelines. If some state categories or timelines need to be made invisible in histogram window, it can be achieved through disabling the corresponding categories in Legend window's column V or S or selected corresponding timelines in histogram window. It is just like that of Timeline window.

Only summary objects can be displayed in the histogram window. Summary object is similar to preview object discussed earlier. Preview objects are created during logfile creation stage and cannot be modified during visualization. Summary objects, on the other hand, are created dynamically during visualization, i.e. during creation of a Duration Info Box, so they can be modified easy by end users. There are 2 different kinds of summary objects: summary state and summary arrow. There is only 1 summary state per timeline and 1 summary arrow for each ordered pair of timelines3.8. Currently 3 different views are available in Histogram window: States Only, Arrows Only and All. In States Only view, only summary states are displayed. In Arrows Only view, only summary arrows are displayed. In All view, both summary states and arrows are displayed.



Footnotes

... timelines3.8
ordered pair of timelines means timeline pair (1,2) is different from pair (2,1).


Subsections
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Next: 3.5.1 Summary States Up: 3. Graphical User Interface Previous: 3.4.4 Row Adjustment Panel   Contents