Deep Analysis with PerfView: GC Stats, JIT Stats, Grouping/Folding and Diffing Two Traces
PerfView's power lies in GroupPats, Fold%, diffs and the GCStats/JITStats reports; since they all rest on the TraceEvent library, you can run the same analysis in code on Linux. In Bookstore we diff two traces to find that 2.6 seconds of a regression is GC waiting, measure with JITStats that ReadyToRun cuts the methods JIT-compiled at startup only from 980 to 928, and build a CI allocation gate whose noise we measured first.
14 Nov 2026
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13 min
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3
