# microsoft/perfview

PerfView is a CPU and memory performance-analysis tool

Repository: https://github.com/microsoft/perfview
Canonical: https://ross.abutalabs.com/products/perfview
Homepage: http://channel9.msdn.com/Series/PerfView-Tutorial
Language: C#
License: MIT
License Family: permissive
Topics: performance-analysis, performance, dotnet, dotnet-core, windows
Last push: 2026-08-26T18:44:23+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 4177, "days_push": 7, "days_rel": 14, "gap_med": 33, "n_releases_24m": 20}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4740, forks 774 (observed 2026-08-28T04:08:57.789316+00:00)

## What it is
PerfView is a free Windows-based performance-analysis tool for isolating CPU and memory performance issues, with special support for .NET applications and some ability to analyze Linux-collected data. It is built on the TraceEvent library, which collects and parses ETW and EventPipe traces.

## Use cases
- profile cpu usage of a .net application
- diagnose memory leaks and heap issues
- analyze etw traces
- find performance bottlenecks in dotnet core apps
- collect and inspect eventpipe traces
- profile gc pauses and allocation issues

## When to choose
- you need deep CPU or memory profiling on Windows, especially for .NET workloads
- you want a free, scriptable profiler backed by the TraceEvent library
- you need to analyze ETW or EventPipe trace files collected on Windows or Linux

## When to avoid
- you need a cross-platform GUI profiler for non-Windows desktops
- you only need simple sampling without ETW trace analysis
- your target platform is macOS or Linux with no Windows machine available for analysis

## Facets
- artifact type: application
- maturity: active
- function: monitoring, benchmarking, developer-tools
- domain: performance, developer-tools, windows
- platform: windows, cli
- tags: profiling, etw, cpu-analysis, memory-analysis, dotnet, trace-event, performance-tuning, desktop

## Member repositories
- microsoft/perfview (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:57.789316+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:18:57.938386+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/perfview (fetched 2026-08-28T04:08:57.789316+00:00, sha eb098f29c87f)
  - homepage: http://channel9.msdn.com/Series/PerfView-Tutorial (fetched 2026-08-29T09:02:31.585733+00:00, sha fe73dfb6c0d0)
  - site_page: https://learn.microsoft.com/en-us/lifecycle/faq/internet-explorer-microsoft-edge (fetched 2026-08-29T09:02:31.588323+00:00, sha c363b2f43d4b)
- Data as of 2026-08-30T08:39:29.467469+00:00.