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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsIn Visual Studio’s Concurrency Visualizer, EventSource events with the opcodes win:Start and win:Stop mark the beginning and end of a span. The visualizer can display that span only when it is neither nested or overlapping with another span nor split across threads.
What win:Start and win:Stop mean
Microsoft documents win:Start as the beginning of a span and win:Stop as its end. This is a convention the Concurrency Visualizer uses to render EventSource events as markers; it describes how the profiler interprets those events, not a general definition of the words “start” and “stop” across Windows.
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See Microsoft’s Visualizing EventSource events as markers documentation for the Visual Studio details.
When the Concurrency Visualizer can display a span
The documented display has two constraints:
- A span cannot be nested inside or overlap another span.
- The event that starts a span and the event that ends it must be on the same thread.
If a trace contains a start/stop pair that violates either constraint, the corresponding span may not appear in the visualizer. A missing displayed span therefore does not, by itself, prove that the relevant events were absent from the trace.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How other EventSource markers are shown
Start/stop spans are one of several marker types. Events with neither opcode may appear as flag markers when they meet the event-level condition in Microsoft’s documentation; otherwise, the visualizer treats them as messages. These categories help distinguish span boundaries from individual event markers.
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