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Add notes from Munich summit (#283)
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‎summits/2019-03/README.md

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# Node.js Diagnostics Summit - Spring 2019
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- **When:** 2019-03-07 to 2019-03-08
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- **Where:** Munich, Germany
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- **Issue:** [#203](https://github.com/nodejs/diagnostics/issues/203)
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- **Agenda:** [Google Doc](https://docs.google.com/document/d/1Ub4kqznhEXHzKtS4ArK5KGBzwRLa29Kamr4lo2BvzcE/preview)
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## Action Items
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The following action items are copied from [this Google Doc](https://docs.google.com/document/d/1ftJCXFM_Yi45O2nr5O7YwdOMO7iUbWSx-UStvOYMu28/edit)
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Besides these action items, there aren't any proper minutes.
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For the best overview see the [Recordings](#recordings) section below.
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### Async Hooks
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Lead: [Matteo Collina](https://github.com/mcollina)
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- Agreement on Benedikt's [document](http://bit.ly/making-async-hooks-fast-enough) (ASAP)
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- This solves the performance issue
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- **Please read and comment**
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- Should there be a higher level API for CLS?
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- Vladmir started working on a PR to add CLS to Core
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### V8 Signals
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Lead: [Yang Guo](https://github.com/hashseed)
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- [Document](https://docs.google.com/document/d/1xHl4qF2olKtDEPQFkci8g_wF3oTA-NBoJ6z5cpw1PWk)
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- There are more trace events that V8 could be emitting
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- Low-hanging fruit: opt/deopt events
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- Identify more use cases
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- Move command line flags to actual APIs
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### Documentation and Best Practices
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Lead: [Michael Dawson](https://github.com/mhdawson)
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- Continue to refine the list of use cases
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- Continue to fill those in
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- Move heapdump generation to core ([@jasnell](https://github.com/jasnell))
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- Write best practices guide based on that
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### Postmortem Debugging
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Lead: [Yang Guo](https://github.com/hashseed)
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- Move V8 to Torque (DSLification)
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- WIP
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- There's a spreadsheet with the progress
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- Move llnode to use the metadata/script generated from DSL
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- Heapsnapshot
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- Additional tooling to help uncover issues aside from core dump
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- Also convert core dump to heapsnapshot
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### Trace Events and System Tracing
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Lead: [James M Snell](https://github.com/jasnell)
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- Perfetto: moving forward
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- `TRACE_EVENTS` will be our primary instrumentation path
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- System tracing will be case-by-case, best effort approach
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- Open an issue notifying stakeholders of this decision ([@jasnell](https://github.com/jasnell))
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- Start to instrument more areas of core
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- Profiling: doc to circulate ([@psmarshall](https://github.com/psmarshall))
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- A flag similar to --prof but based on the CPU Profiler ([@joyeecheung](https://github.com/joyeecheung))
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### APM Instrumentation
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- V8 exposing a new API is not what we need
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- We need to figure out what APM vendors want
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- Come up with a blessed instrumentation API for module vendors to instrument their modules
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- Document on monkey-patching vs. ESM
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## Recordings
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_Raw recordings can be found in [Google Drive](https://drive.google.com/drive/folders/1YLrO8XwAdWPaFNmyZZRqPAsSIDGo_RXw)_
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### Talks
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| Recording | Speaker | Slides |
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|-----------|---------|--------|
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| [Intro to OpenCensus, OpenTracing, and TraceContext](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=865) | [Thomas Watson](https://github.com/watson) | [SpeakerDeck](https://speakerdeck.com/wa7son/standards-in-distributed-tracing)
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| [Perfetto and Node.js](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=2557) | [Kelvin Jin](https://github.com/kjin) |
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| [Intro into APM agents, comparison of Node.js and Java](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=4700) | [Gerhard Stöbich](https://github.com/flarna) |
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| [Zero cost async stack traces](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=6797) | [Benedikt Meurer](https://github.com/bmeurer) |
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| [Status of Async Hooks](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=9870) | [Matteo Collina](https://github.com/mcollina) |
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| [How to use a core dump](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=11302) | [Yang Guo](https://github.com/hashseed) |
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| [Diagnostics Best Practices documentation](https://drive.google.com/file/d/1Of-bwwZtv0sb-7R1cEjyIqizDgyT4a4i/view?t=12125) | [Michael Dawson](https://github.com/mhdawson) |
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| [Diagnostics in Java](https://drive.google.com/file/d/15MzZoIiUKpOUr86inpUqsl2phUsk05x2/view?t=143) | [Felix Barnsteiner](https://github.com/felixbarny) |
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| [Status of Node Clinic / Doctor, Bubbleprof, Flame](https://drive.google.com/file/d/15MzZoIiUKpOUr86inpUqsl2phUsk05x2/view?t=2008) | [Matteo Collina](https://github.com/mcollina) |
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| [State of CPU Profiling in V8](https://drive.google.com/file/d/1vIdYiFYW7S3804U7_5iznP9M-IO8xvNv/view?t=52) | [Peter Marshall](https://github.com/psmarshall) |
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| [CloudFlare Workers](https://drive.google.com/file/d/1zlY37F-AtunGyqMbMC6TaAB40icN8GU0/view) |
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### Discussions
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| Recording | Notes |
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|-----------|-------|
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| [V8 Signals](https://drive.google.com/file/d/1LeSfIzArwvJfy2kGtbxF6HiMOukLabOg/view?t=281) | [Google Doc](https://docs.google.com/document/d/1xHl4qF2olKtDEPQFkci8g_wF3oTA-NBoJ6z5cpw1PWk/preview)
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| [Documentation best practices](https://drive.google.com/file/d/1LeSfIzArwvJfy2kGtbxF6HiMOukLabOg/view?t=3232) | [Slides](https://github.com/nodejs/diagnostics/files/2957405/Diagnostic.Summit.-.Best.Practices.pdf)
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| [Diagnostics Tooling Support Tiers](https://drive.google.com/file/d/1LeSfIzArwvJfy2kGtbxF6HiMOukLabOg/view?t=3388) |
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| [Async Hooks](https://drive.google.com/file/d/1LeSfIzArwvJfy2kGtbxF6HiMOukLabOg/view?t=9227) | [Google Doc](https://docs.google.com/document/d/1g8OrG5lMIUhRn1zbkutgY83MiTSMx-0NHDs8Bf-nXxM/preview)
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| [Post-mortem debugging](https://drive.google.com/file/d/1Enw2Z0R9pNsoaCVq8LPK6Ja-P-T5QX-h/view?t=2940) |
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| [Trace events, system tracing, profiling](https://drive.google.com/file/d/1U9SfKfb83M-AQX3IL-XgX-OGuGAz4c5w/view) |
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| [APM instrumentation](https://drive.google.com/file/d/11nk_cZYUCZhUKptHD-4dlS5PxQTeLXlc/view) |

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