kelindar / ecs

Example of Entity Component System in Go

Hey 👋, I'm Roman!

I love building stuff, currently working as a Principal Engineer in Careem on experimentation, optimization and machine learning platforms. Prior to Careem, I worked as Head of Data Science in AirAsia and as a Principal Engineer in Grab, the super app of South East Asia where we built Product Insights & Experimentation Platforms amongst other things. I also obtained a PhD in Computer Science and Human-Computer Interaction with Trinity College Dublin & IBM Research, and worked as an engineer at various successful companies in Europe, building things like online gaming platforms, autonomous helicopters, or particle/matter collision simulators!

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🚀 Distributed Systems I have designed and open-sourced

• emitter-io/emitter - high performance, distributed and low latency publish-subscribe platform
• kelindar/talaria - distributed, highly available, and low latency time-series database for Presto

📦 Golang Libraries I made to help me in building software faster or explore a certain idea

• kelindar/async - concurrency patterns library using promises for Go
• kelindar/approx - probabilistic data structures (e.g. morris counting, count-min sketch, topk) in Go
• kelindar/binary - generic and fast binary serializer for Go
• kelindar/bitmap - zero-allocation dense bitmap index for Go
• kelindar/column - columnar in-memory db (structures-of-arrays) with querying and indexing in Go
• kelindar/goap - goal oriented action planning library in Go
• kelindar/intmap - fast uint32-to-uint32 hash map, about 20-50% faster than Go map
• kelindar/tile - 2D grid engine, built with data and cache friendly ways, includes pathfinding and observers
• kelindar/timeline - Scheduler of events for near real-time systems in Go
• kelindar/evolve - Go implementation of a binary genetic algorithm with random binary crossover & mutation
• kelindar/loader - Go library that allows for downloading things from a URL (http, s3, ...)
• kelindar/ecs - high-performance entity component system in pure Go
• kelindar/event - simple internal event bus for Go applications
• kelindar/lua - wrapper around LUA script executor for long-running scripts
• kelindar/tcp - simple TCP server in Go
• kelindar/process - Go library for process usage retrieval
• kelindar/simd - auto-vectorized SIMD math functions for Go
• kelindar/smutex - simple sharded mutual exclusion in Go
• kelindar/xxrand - XXH3-Based Pseudorandom Number Generator
• kelindar/iostream - Simple binary reader and writer for io.Reader/io.Writer streams
• kelindar/simplex - Simplex noise in Go
• emitter-io/address - Go library providing a set of utilities for dealing with network addressing
• emitter-io/stats - high-performance library for stats and metric aggregation
• emitter-io/config - library for hierarchical config management

🧪 Experiments in which I tried with various ideas

• kelindar/gocc - tool to transpile C to Go assembly using clang & objdump
• kelindar/hashbench - benchmarking various hash functions in Go
• kelindar/etop - command-line utility for emitter.io cluster status
• kelindar/spiral - procedurally generating a spiral galaxy in Go
• kelindar/markov - experimenting with markov-chain procgen in Go
• kelindar/pmml2lua - trying to convert PMML decision trees into LUA code
• kelindar/spike-box - what if we can data-bind js/DOM transparently over the network?
• kelindar/misakai-baker - static site generator for C# / .Net people
• manycore/dashboard - profiling your parallelized app by categorizing issues and visually browsing them
• manycore/matmul - matrix multiplication benchmark suite for parallel performance measurement
• manycore/harvester - operating system and hardware performance counter collector utility

🎨 Emitter Demos I have prepared for the project

• chat - building a chat with emitter
• actor - distributed actor model with emitter
• client-server - how to create a client/server application with emitter
• platformer - making an online platformer with emitter
• retain - how to use message retention in emitter
• share - how to use shared subscriptions in emitter
• iss - tracking international space station in real-time
• presence - demo of the channel presence for emitter

📚 Blogs & Papers I have written in the past

• Technical Blog - My random blog posts around experimentation, performance and open source
• Ph.D Thesis - Supporting visual diagnosis of performance problems in multi-core and parallel software
• SIGCHI'14 Paper - Design considerations for parallel performance tools
• IEEE Journal Paper - Parallel Performance Problems on Shared-Memory Multicore Systems: Taxonomy and Observation

ecs's Issues

missing license

would love to use this in a project, unfortunately given the fact its currently without a clear license, I can't.

Question about networking

It looks like this is designed to be embedded in the game.
i guess the columns in memory db under the hood is doing cdc to sync over the network to a server that then filters and publishes changes to other clients?

i only ask because this stack is really nice and I am playing around with a web gui that needs to connect to the ECS system . Found nothing doing networking and so just wanted to ask . Hope this is not too bothersome ; lovely system btw