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4.4. INFORMATION FILTERING AND REDUCTION
4.4 Information Filtering and Reduction
Due to the large amount of information that can be stored in trace files, it is
usually necessary to reduce the displayed information according to some filter
criteria. In Vampir, there are different ways of filtering. It is possible to limit
the displayed information to a certain choice of processes or to specific types
of communication events, e.g. to certain types of messages or collective operations. Deselecting an item in a filter means that this item is fully masked. In
Vampir, filters are global. Therefore, masked items will no longer show up in any
chart. Filtering not only affects the different charts, but also the ‘Zoom Toolbar”.
The different filters can be reached via the “Filter” entry in the main menu.
Example: Figure 4.17 shows a typical process representation in the “Process
Filter” window. This kind of representation is equal to all other filters. Processes
can be filtered by their “Process Group”, “Communicators” and “Process Hierarchy”. Items to be filtered are arranged in a spreadsheet representation. In
addition to selecting or deselecting an entire group of processes, it is certainly
possible to filter single processes.
Figure 4.17: Process Filter
Different selection methods can be used in a filter. The check box “Include/Exclude
All” either selects or deselects every item. Specific items can be selected/deselected
by clicking into the check box next to it. Furthermore, it is possible to select/deselect multiple items at once. Therefore, mark the desired entries by
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