$ show microsoft/perfview
PerfView is a comprehensive performance analysis and diagnostics toolkit primarily for Windows, with growing Linux support. It collects, parses, and visualizes Event Tracing for Windows (ETW), .NET EventPipe, Linux perf, and CTF traces. The repository contains a WPF desktop application (PerfView.exe) for interactive stack, memory, and heap analysis, along with command-line tools (HeapDump, TraceParserGen, perfcollect) and a reusable library (Microsoft.Diagnostics.Tracing.TraceEvent) for programmatic trace processing. The architecture is modular, with core libraries for fast serialization, stack analysis, symbol resolution, and automated analysis. While the codebase is well-maintained and extensively tested, it contains some legacy components (custom compression, duplicated utilities) and conditional compilation that indicate moderate technical drift. The library components are the most reusable assets, offering patterns for binary serialization, caching, recursion safety, and event filtering.
The LLM identified 4 files worth highlighting for reuse:
Implements a custom binary serialization framework (IFastSerializable) with configurable stream label widths, supporting efficient serialization of complex object graphs. Used pervasively in TraceLog and MemoryGraph. Can be extracted as a standalone library for any project needing compact, fast serialization.
A generic LRU cache with a fixed maximum capacity (default 65534 entries) using a pseudo-LRU eviction strategy. Supports disposal of evicted entries via IDisposable. Thread-safe and reusable for any caching scenario where bounded memory and automatic eviction are needed.
Prevents stack overflow in deep recursive call trees by trampolining execution to a new thread when a recursion depth limit is exceeded. Provides a configurable MaxResets threshold and resets the guard on each trampoline. A reusable pattern for any recursive algorithm that may exceed the call stack.
Implements a domain-specific language for filtering trace events using property-based expressions (e.g., 'EventName == "GCStart"'). Uses the Shunting Yard algorithm to parse infix expressions into an expression tree, supporting operators (==, !=, <, >, Contains) and event name scoping. Reusable for any filtering DSL with similar syntax.