The Performance Collectors page allows you control how performance data can be conditional collected.
When collecting performance data you may want to concentrate on very specific parts of your application.
Collectors allow you to switch data collection on or off as the program enters a named function. The collection state before entry is resumed on function exit.
The initial collection state, i.e. before entering any collectors, can be set on or off.
Changes to the collectors will apply to the next session, not the current session.
Data collection is subject to the other global data collection flags.
See the question on using Performance Collectors or Class & Function Filters?
Consider an imaginary application where only the myApp::sortThisData() function and all functions called from it are of interest.
You would configure Performance Validator to initially not collect performance data, by selecting Collection of performance statistics is normally OFF until modified by a collector.
You'd also add myApp::sortThisData to the list of collectors and set the status to Collect.
Now when the application reaches myApp::sortThisData the collection of performance data is turned on because of that Collect status.
The application runs as normal, and performance data is collected until the function myApp::sortThisData finishes executing.
At that point the previous collection status (OFF) is restored.
Consider a simple application that calls two different sorting algorithms doSort1 and doSort2 as in the call sequence below:
Imagine you're only interested in the performance of the algorithm doSort1, but none of the other application code.
You'd set MyApp::doSort1 as a collector, triggering data collection to turn on only whilst in that function and any of it's children.
Another way to look at this is to say that you're interested in the pre(), compute() and post() functions, but only if called from doSort1().
You can add multiple triggers to switch collection on for methods of interest or to switch collection off to eliminate unwanted data.
The initial collection of data can be on or off until a collector is visited
•Collection of performance statistics is normally ON... collect performance data until switched off by a collector
•Collection of performance statistics is normally OFF... prevent data collection until switched on by a collector
•Add adds a row to the Collectors table enter the class::method name and the desired collection status
The two status options are Collect and Don't Collect.
Collectors are enabled by default. Use the yellow checkbox at the start of the line to disable it without having to remove it from the list.
•Remove removes any selected collectors in the list
•Remove All clears the list
•Enable All enables all collectors in the list
•Disable All disables all collectors
Don't confuse the collection status (second column) and the enabled status (checkboxes)
Disabled collectors don't affect the performance data collection status.
Reset All - Resets all global settings, not just those on the current page.
Reset - Resets the settings on the current page.