Designing an ultra low-overhead multithreading runtime for Nim Mamy Ratsimbazafy mamy@numforge.co Weave https://github.com/mratsim/weave Hello! I am Mamy Ratsimbazafy During the day blockchain/Ethereum refactoring of the internals 3 Agenda ◇ Understanding the design space ◇ Hardware and software multithreading: definitions and use-cases ◇ Parallel APIs ◇ Sources of overhead and runtime design ◇ Minimum threads -> N hardware threads The same distinctions can be done at a multithreaded language or multithreading runtime level. The problem 8 How to schedule M tasks on N hardware threads? Latency vs

categories) ❏ Modern C++ Data Types (move semantics) ❏ CsString library (unicode) ❏ Multithreading in C++ ❏ Multithreading using libGuarded ❏ Signals and Slots ❏ Templates in the Real World ❏ What’s in ● CsString Library ○ standalone unicode aware string library ● CsLibGuarded ○ standalone multithreading library for shared data 46Applications ● KitchenSink ○ contains 30 demos and links with almost

char8_t ❏ Multithreading in C++ ❏ Modern C++ Threads ❏ C++ Memory ModelPresentations - www.youtube.com/copperspice ❏ Why CopperSpice, Why DoxyPress ❏ Compile Time Counter ❏ Multithreading using CsLibGuarded ● CsString Library ○ standalone unicode aware string library ● CsLibGuarded ○ standalone multithreading library for shared data 52Libraries ● CsCrypto ○ C++ interface to the Botan and OpenSSL libraries

2.7 starts in 54s ◉ Stellaris 2.8 beta starts in 21s ◉ Same amount of work ◉ Both rely on multithreading 112.7 (Old) Startup CPU Usage2.8 (New) Startup CPU UsageStartup Breakdown ◉ Enumerate asset tracks from zips ◉ Can we optimize unzip() further? ◉ PhysFS still has a lock per archive, so multithreading might be tricky 67Loading audio ◉ How many music tracks do we need to display loading screen

Management 10.5. JSP Tag Library IV. Auxiliary Support 辅助支持 11. Caching 缓存 12. Concurrency & Multithreading 并发与多线程 13. Testing 测试 14. Custom Subjects 自定义 Subject V. Integration 整合 15. Spring Framework Manual 中文翻译 116 11. Caching 缓存 12. Concurrency & Multithreading 并发与多 线程 待定 Apache Shiro 1.2.x Reference Manual 中文翻译 117 12. Concurrency & Multithreading 并发与多线程 13. Testing 测试 文档的这一部分介绍了在单元测试中如何使用Shiro。

2024Self-Introduction • Got my Ph.D. from UC, Riverside last year • Automatic testing of multithreading programs • Symbolic execution improvements • Fault detection in concurrent data structures

Concurrencpp • https://github.com/David-Haim/concurrencpp • Cppcon2022 talks • An Introduction to Multithreading in C++20 by Anthony Williams • https://www.youtube.com/watch?v=A7sVFJLJM-A • Simulating Low

Bibliotheken. Dies sind libfbclient.so und libfbembed.so. libfbclient.so) Ermöglicht Ihrem Client das Multithreading, muss jedoch über einen Server eine Verbindung zu einer Datenbank herstellen

core : 1 thread of execution (MIMD) • Cores share main memory, can share caches • Simultaneous multithreading (x86 / x64) -> 2N virtual cores • Query number of cores: std::thread::hardware_concurrency()

} 46What Volatile Means (and Doesn't Mean) Copyright © 2024 by Ben Saks and Dan Saks 0-22 Multithreading — The Wrong Tool for the Job  The Standard Library and other threading libraries provide synchronization