microsoft/perfview

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PerfView is a CPU and memory performance-analysis tool

Stars: 4.7k
Forks: 775
Open beginner issues: 0
Indexed issues: 86
Avg merge: 5d 11h
Merged PRs (30d): 9

Dominant language: C#
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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86 open issues indexed

[TraceEvent] TraceCallStacks interning tables grow without bound on the real-time/EventPipe path in long-lived processes (~0.6 GB/day to OOM) Open

bug

Difficulty 5/5 Over a week Newbie friendliness 42/100

microsoft/perfview#2451 · 1 comment · 12 reactions · Opened Aug 9, 2026
TraceEvent `SymbolReader` does not resolve source lines from an embedded portable PDB Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

microsoft/perfview#2433 · Opened Jun 2, 2026
EDR detection of SystemTraceProvider consumers — current data on Defender ATP / CrowdStrike / SentinelOne? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/perfview#2422 · 1 comment · Opened May 17, 2026
Please ship PerfViewCollect Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

microsoft/perfview#2420 · Opened May 15, 2026
Too high attribution to PollGCWorker or P/Invokes in general Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/perfview#2412 · Opened Apr 15, 2026
ETWReloggerTraceEventSource: access violation in tdh!CEventBase::Release on finalizer thread after Dispose Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

microsoft/perfview#2411 · Opened Apr 14, 2026
System.Runtime.InteropServices.COMException when trying to open dialog to add Process Dump File Open

microsoft/perfview#2395 · 4 comments · 1 reaction · 2 assignees · Opened Mar 24, 2026
CreateFromLinuxEventSources should produce SampledProfileTraceData from perf.data Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/perfview#2393 · 3 comments · Opened Mar 22, 2026
TraceEvent Library: Incorrect CreateOptions flags enumeration for FileIOCreateTraceData Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/perfview#2333 · Opened Nov 14, 2025
Use a Unique Kernel Session Name Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2298 · Opened Sep 11, 2025
LBR state is incorrect during nt!SwapContext Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2288 · 1 comment · Opened Aug 25, 2025
TraceEvent + CaptureState Issue from https://github.com/microsoft/perfview/pull/2222 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2279 · 1 comment · Opened Aug 11, 2025
`FocusProcess` checkbox is hidden. Open

Difficulty 1/5 Under an hour Newbie friendliness 62/100

microsoft/perfview#2265 · 2 comments · Opened Jul 16, 2025
Publish to Microsoft Store Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/perfview#2187 · 4 comments · 1 reaction · Opened Apr 25, 2025
Inconsistent CPU usage, why? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/perfview#2184 · 2 comments · Opened Apr 22, 2025
How to create an ETW session that is both real-time and saved to ETL? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2174 · 2 comments · Opened Mar 8, 2025
KernelTime UserTime from Event metadata. Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/perfview#2138 · Opened Dec 24, 2024
Why do the frames not belong to its activity when `Task.Yield()` is involved? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2130 · 3 comments · Opened Nov 15, 2024
Missing activity in case of "broken" ActivityID in events Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/perfview#2122 · 4 comments · Opened Oct 21, 2024
How to properly use and visualize Start Stop activities in a custom ETW provider Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/perfview#2116 · 4 comments · Opened Oct 8, 2024
NGEN PDBs end up in symbol cache Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/perfview#2113 · 1 comment · Opened Sep 21, 2024
COMException during symbol lookup when using OpenStackViewer and MutableTraceEventStackSource Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2108 · Opened Aug 30, 2024
Update docs for release Open

microsoft/perfview#2102 · 1 reaction · 1 assignee · Opened Aug 26, 2024
Use IDiaSessionEx::getSourceLinkInfo as it's now public Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/perfview#2094 · Opened Aug 8, 2024
Use IDiaDataSource::getStreamSize as it's now public Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/perfview#2093 · Opened Aug 8, 2024
Add a public API to read call stacks in EventPipeEventSource Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/perfview#2084 · 2 comments · Opened Jul 27, 2024
MonitorPerfCounter for all instances? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#2022 · Opened Apr 10, 2024
Why isn't PerfViewCollect available? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/perfview#2021 · 1 comment · 2 reactions · Opened Apr 10, 2024
Update msdia into new LTS Open

microsoft/perfview#1987 · 1 assignee · Opened Feb 1, 2024
Proposal for an Optimization Toggle for Real-time Mode to Reduce Memory Overhead Using RingBuffer Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/perfview#1963 · 2 comments · Opened Dec 27, 2023
.NET Alloc profiler activation on .NET (Core) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#1955 · 2 comments · Opened Dec 1, 2023
Saved View Settings are not restored Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/perfview#1946 · Opened Nov 15, 2023
Pinned Object Heap Data in the Raw XML from the GCStats View Lacks Fields Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/perfview#1890 · Opened Jul 28, 2023
IIS OOB module events not captured Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/perfview#1848 · Opened Mar 29, 2023
Diagsession files not opening normally Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/perfview#1819 · 2 comments · 1 reaction · Opened Feb 27, 2023
Automate adding releases to winget Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/perfview#1792 · 1 comment · 2 reactions · Opened Jan 25, 2023
Handles events, Windows 10 and "NT Kernel session" in EventTracing API Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/perfview#1776 · 1 reaction · Opened Jan 5, 2023
PFMappedSectionCreate and PFMappedSectionDelete payloads not decoded Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/perfview#1751 · Opened Nov 16, 2022
AutoLogger rolls ETL files in a format not accepted by PerfView Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/perfview#1738 · 1 comment · Opened Oct 30, 2022
perfcollect & PerfView: unable to get events working Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/perfview#1718 · 3 comments · Opened Sep 29, 2022
perfcollect pid filter produces empty dump in PerfView Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/perfview#1705 · 9 comments · Opened Sep 2, 2022
Verbosity Level Not Shown in the commandLine Property of the PerfView/CommandLineParameters Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/perfview#1703 · 1 comment · Opened Sep 1, 2022
Perfview option to display/export actual time/ticks instead of/in addition to the time offset Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/perfview#1700 · 5 comments · Opened Aug 29, 2022
Adding a UserCommand to convert etl files to speedscope.json or updating NetperfToSpeedScope Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/perfview#1688 · 4 comments · Opened Aug 17, 2022
Using ETWReloggerTraceEventSource to gather events just from a certain time start/stop doesn't include stacks Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/perfview#1678 · 1 comment · 1 reaction · Opened Aug 4, 2022
Microsoft.Diagnostics.Tracing.ZippedETLWriterGetNGenPdbs Add Try/Catch and log exception Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

microsoft/perfview#1666 · Opened Jul 19, 2022
Stackoverflow exception Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

microsoft/perfview#1662 · Opened Jul 12, 2022
SystemEvents OpCode might be wrong for UDP events Open

Difficulty 1/5 1-3 hours Newbie friendliness 48/100

microsoft/perfview#1655 · Opened Jul 1, 2022
AutomatedAnalysisTraceLog is not IDisposable Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/perfview#1623 · Opened Apr 21, 2022
Microsoft.Diagnostics.Tracing: Incomplete data in payload for some OS providers Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/perfview#1611 · 1 comment · Opened Apr 14, 2022

microsoft/perfview

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