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https://github.com/thlorenz/v8-perf

⏱️ Notes and resources related to v8 and thus Node.js performance
https://github.com/thlorenz/v8-perf

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⏱️ Notes and resources related to v8 and thus Node.js performance

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# v8-perf



Notes and resources related to V8 and thus Node.js performance.



**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*



- [Topics](#topics)

  - [Data Types](#data-types)

  - [Compiler](#compiler)

  - [Language Features](#language-features)

  - [Garbage Collector](#garbage-collector)

  - [Memory Profiling](#memory-profiling)

  - [Inspection and Performance Profiling](#inspection-and-performance-profiling)

  - [Snapshots and Code Caching](#snapshots-and-code-caching)

  - [Runtime Functions](#runtime-functions)

- [V8 source and documentation](#v8-source-and-documentation)

  - [source](#source)

  - [source documentation](#source-documentation)

- [LICENSE](#license)



## Topics



### Data Types



The [data types](data-types.md) document explains what data types V8 uses under the hood to

store JavaScript data and how it relates to the performance of your code.



### Compiler



The [V8 compiler](compiler.md) document outlines the V8 compiler pipeline including the

Ignition Interpreter and TurboFan optimizing compiler. It explains how information about your

code is executed to allow optimizations, how and when deoptimizations occur and how features

like the CodeStubAssembler allowed reducing performance bottlenecks found in the [older

pipeline](crankshaft/compiler.md).



### Language Features



The [language features](language-features.md) document lists JavaScript language features and

provides info with regard to their performance mainly to provide assurance that performance of

most features is no longer an issue as it was with the previous compiler pipeline.



### Garbage Collector



The [V8 garbage collector](gc.md) document talks about how memory is organized on the V8 heap,

how garbage collection is performed and how it was parallelized as much as possible to avoid

pausing the main thread more than necessary.



### Memory Profiling



The [memory profiling](memory-profiling.md) document explains how JavaScript objects are

referenced to form a tree of nodes which the garbage collector uses to determine _collectable_

objects. It also outlines numerous techniques to profile memory leaks and allocations.



### Inspection and Performance Profiling



Inside the [inspection](inspection.md) document you will find techniques that allow you to

profile your Node.js or web app, how to produce flamegraphs and what flags and tools are

available to gain an insight into operations of V8 itself.



### Snapshots and Code Caching



[This document](snapshots+code-caching.md) includes information as to how V8 uses caching

techniques in order to avoid recompiling scripts during initialization and thus achieve faster

startup times.



### Runtime Functions



The [runtime functions](runtime-functions.md) document gives a quick intro into C++ functions

accessible from JavaScript that can be used to provide information of the V8 engine as well as

direct it to take a specific action like optimize a function on next call.



## V8 source and documentation



It's best to dig into the source to confirm assumptions about V8 performance first hand.



### source



- [home of V8 source code](https://code.google.com/p/v8/)

- [V8 code search](https://source.chromium.org/chromium/chromium/src/+/main:v8/)

- [V8 source code mirror on github](https://github.com/v8/v8/)



### source documentation



Documented V8 source code for specific versions of Node.js can be found on the [v8docs

page](https://v8docs.nodesource.com/).



## LICENSE



MIT