golang/go

runtime: consider using batched shuffle in selectgo

Open

#68,933 opened on Aug 18, 2024

View on GitHub
 (8 comments) (0 reactions) (1 assignee)Go (19,008 forks)batch import
NeedsInvestigationPerformancecompiler/runtimehelp wanted

Repository metrics

Stars
 (133,883 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

This is a minor optimization opportunity. runtime.selectgo typically does a shuffle of a fairly small number of channels. https://lemire.me/blog/2024/08/17/faster-random-integer-generation-with-batching/ introduces an optimization for such shuffles. It might be worth incorporating the technique into selectgo. (math/rand/v2 is probably not possible due to backwards compat.)

Contributor guide

Research direction
Study the current selectgo shuffle implementation and consider applying the batched random integer generation technique from the referenced blog post.
Tech stack
go
Domain
backend
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Go
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40