GenieFramework/Genie.jl

Simple server in multi-threaded julia

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#151 opened on Jul 19, 2019

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 (24 comments) (1 reaction) (1 assignee)Julia (2,408 stars) (186 forks)batch import
TODOhelp wantedparallelism

Description

Describe the bug I like to run a server on the main thread in a multi-threaded julia (e.g. julia -p4). I don't need to handle requests on multiple threads, however, I need the threads for some calculations.

I get the following error:

From worker 2:    2019-07-19 08:51:57:ERROR:Main: / 404
From worker 2:

To Reproduce

Run the following code with julia -p 2

using Genie, Genie.Router, Genie.Renderer, Genie.Requests
using HTTP
using Distributed

println("Started julia with $(nworkers()) threads.")

Genie.config.run_as_server = true

route("/") do
    (:result => "Hello") |> json
end

Genie.startup()

Open the site.

Expected behavior The request is handled by the main thread.

Contributor guide

Tech stack
None
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JuliaGenie.jlDistributed computing
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how Genie starts its server and handles HTTP requests in a multi threaded environment. Look into the Genie startup code and the interaction with Distributed.jl to understand why requests are not processed on the main thread. Review the issue comments for any proposed fixes or workarounds. The solution may involve modifying the server's listen loop or request dispatching to ensure main thread execution.