How to investigate performance of stylers in coder

The class VirtualMachineAllProcessesSwitchTelemetry Object subclass: #VirtualMachineAllProcessesSwitchTelemetry instanceVariableNames: 'id startTime signalsDictionary contextSwitchSignalClass semaphoreWaitSignalClass objectSignalClass contextSignalClass orderedCollectionClass' classVariableNames: '' package: 'Telemetry-VirtualMachine' provides a profiler that can show how much each invidual styler is taking.

Running the telemetry

In using it we should first start the telemetry for a given number of seconds and then do in that time the action that we want to profile, like opening a coder or typing in a method. A notification is raised when the telemetry is done. 

telemetry := VirtualMachineAllProcessesSwitchTelemetry spyFor: 10 seconds.
  
telemetry eventsByProcess mergedByParentProcess

Manual styler runs

Another way to profile stylers is to manually run them several times and use a normal tally.

Select method

Two larger methods 

method := BlFocusProcessorExamples>>#loseFocus_03_add_back_child_1
  
method := MetacelloConfigurationResource>>#setUpConfigurationOfProjectToolBox

Create coder 

coder := GtPharoMethodCoder forMethod: method.
coderViewModel := coder asCoderViewModel.

Create styler 

styler := GtMethodAdviceStyler new isForWorkspace: false.
styler coderViewModel: coderViewModel.
  
styler := GtPharoDynamicHighlightStyler new.
styler coderViewModel: coderViewModel.
  
styler := GtPharoMethodExpanderStyler  new.
styler coderViewModel: coderViewModel.
  
styler := GtPharoDeprecationStyler new.
styler coderViewModel: coderViewModel.

Run profiler 

1000 timesRepeat: [styler style: method sourceCode asRopedText]
  
AndreasSystemProfiler gtSpyOn: [
	1000 timesRepeat: [styler style: method sourceCode asRopedText] ]