[インデックス 15571] ファイルの概要

このコミットは、Goランタイムのスケジューラに関する重要な設計ドキュメントへのリンクを src/pkg/runtime/proc.c ファイルに追加するものです。これは、Go 1.1で導入された新しいスケジューラの背景と詳細を開発者が容易に参照できるようにするための変更です。

コミット

commit 69c90985b34564c344a8516be9fb3d4832f2b66e
Author: Russ Cox <rsc@golang.org>
Date:   Mon Mar 4 10:36:45 2013 -0500

    runtime: add link to design doc for new scheduler
    
    R=golang-dev, remyoudompheng, bradfitz
    CC=golang-dev
    https://golang.org/cl/7419049

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/69c90985b34564c344a8516be9fb3d4832f2b66e

元コミット内容

runtime: add link to design doc for new scheduler

このコミットは、Go 1.1リリースに向けてGoランタイムのスケジューラが大幅に改善された時期に行われました。新しいスケジューラは、Goの並行処理モデルの効率性とスケーラビリティを向上させることを目的としていました。このような重要な変更には、その設計思想、実装の詳細、および動作原理を説明する包括的なドキュメントが不可欠です。このコミットは、開発者がコードを理解し、新しいスケジューラの設計意図を把握できるように、関連する設計ドキュメントへの直接的な参照をコードベースに追加することで、ドキュメントとコードの間の関連性を強化することを目的としています。これにより、将来のメンテナンスや機能追加の際に、スケジューラの複雑な動作を理解するための手間が省かれます。

前提知識の解説

Go言語は、その並行処理モデルで知られており、ゴルーチン（Goroutine）とチャネル（Channel）を介したCSP（Communicating Sequential Processes）スタイルを特徴としています。この並行処理を効率的に管理するために、Goランタイムには独自のスケジューラが組み込まれています。

ゴルーチン (Goroutine): Goランタイムによって管理される軽量なスレッドのようなものです。数千、数万のゴルーチンを同時に実行してもオーバーヘッドが非常に小さいのが特徴です。
OSスレッド (M - Machine): オペレーティングシステムによって管理される実際の実行単位です。Goランタイムは、複数のゴルーチンを少数のOSスレッドに多重化して実行します。
プロセッサ (P - Processor): Goランタイムのスケジューラがゴルーチンを実行するために必要な論理的なプロセッサを表します。これは、OSスレッドがGoコードを実行するためのコンテキストを提供します。Pの数は通常、CPUコアの数に設定され、同時に実行できるGoコードの数を制限します。

Goのスケジューラは、これらG（Goroutine）、M（Machine）、P（Processor）の3つの要素からなる「G-M-Pモデル」を採用しています。スケジューラの主な役割は、実行可能なゴルーチンをPに割り当て、M上で実行することです。これにより、OSスレッドの切り替えコストを最小限に抑えつつ、多数のゴルーチンを効率的に並行実行できます。

Go 1.1のスケジューラは、特にI/Oバウンドなワークロードや、多数のゴルーチンが頻繁にブロック・アンブロックを繰り返すようなシナリオでのパフォーマンスとスケーラビリティを大幅に改善することを目標としていました。

技術的詳細

Go 1.1で導入された新しいスケジューラは、以前のバージョンと比較していくつかの重要な改善がなされました。その設計ドキュメント http://golang.org/s/go11sched は、「Scalable Go Scheduler Design Doc.」と題され、Dmitry Vyukovによって執筆されました。このドキュメントは、Goランタイムがどのように並行処理を管理するかを理解するための重要なリソースです。

新しいスケジューラの主な特徴は以下の通りです。

G-M-Pモデルの洗練: G-M-PモデルはGo 1.0から存在していましたが、Go 1.1ではその実装がより堅牢になり、特にPの管理とゴルーチンのキューイングが改善されました。各Pはローカルな実行可能なゴルーチンキューを持ち、MはPからゴルーチンを取得して実行します。
ワークスチール (Work Stealing): あるPのローカルキューが空になった場合、そのPに割り当てられたMは、他のPのローカルキューからゴルーチンを「盗む（steal）」ことができます。これにより、CPUコアの利用率が最大化され、ゴルーチンの飢餓状態を防ぎ、全体的なスループットが向上します。
システムコールハンドリングの改善: ゴルーチンがシステムコール（例: ファイルI/O、ネットワークI/O）を実行する際に、そのゴルーチンを実行しているMはPから切り離され、システムコールが完了するまでブロックされます。この間、Pは他のMに割り当てられ、他のゴルーチンを実行し続けることができます。これにより、システムコールによるブロッキングが全体の並行処理に与える影響が最小限に抑えられます。
プリエンプションの導入（限定的）: Go 1.1のスケジューラは、CPUバウンドなゴルーチンが長時間実行され、他のゴルーチンが実行機会を得られない「飢餓状態」を防ぐために、限定的なプリエンプションのメカニズムを導入しました。これは、関数呼び出しの際にスケジューラが介入し、必要に応じてゴルーチンを切り替えるという協調的なプリエンプションでした。完全な非同期プリエンプションはGo 1.14で導入されますが、Go 1.1の変更はその基礎を築くものでした。
スケーラビリティの向上: これらの改善により、マルチコアプロセッサ上でのGoプログラムの並行処理性能とスケーラビリティが大幅に向上しました。特に、多数のゴルーチンが同時に動作するサーバーアプリケーションにおいて、その効果は顕著でした。

このコミットで追加されたリンクは、これらの複雑なメカニズムがどのように設計され、機能するのかを詳細に説明するドキュメントへの直接的なポインタとして機能します。

コアとなるコードの変更箇所

diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 6b9f8eae80..4ce0a718cd 100644
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -18,6 +18,8 @@
 // P - processor, a resource that is required to execute Go code.
 //     M must have an associated P to execute Go code, however it can be
 //     blocked or in a syscall w/o an associated P.
+//
+// Design doc at http://golang.org/s/go11sched.
  
 typedef struct Sched Sched;
 struct Sched {

コアとなるコードの解説

変更は src/pkg/runtime/proc.c ファイルの2行の追加のみです。

具体的には、P - processor の定義に関するコメントブロックの直後に、以下の行が追加されています。

//
// Design doc at http://golang.org/s/go11sched.

これは、Goランタイムのスケジューラの中核をなす P (Processor) の概念を説明する既存のコメントに、新しいスケジューラの設計ドキュメントへのURLを追加するものです。コードの動作自体には影響を与えませんが、このファイルを読む開発者に対して、スケジューラの詳細な設計に関する公式ドキュメントへの参照を提供します。これにより、コードの意図や背景をより深く理解するための手助けとなります。

参考にした情報源リンク

go.dev: https://go.dev/blog/go1.1 (Go 1.1リリースノート)
golang.design: https://golang.design/go-scheduler/ (Goスケジューラに関する詳細な解説)
medium.com: https://medium.com/@ankur_anand/go-scheduler-part-1-goroutine-os-thread-processor-gmp-model-629794476376 (G-M-Pモデルに関する解説)
container-solutions.com: https://www.container-solutions.com/go-scheduler-part-1-goroutine-os-thread-processor-gmp-model (Goスケジューラに関する解説)
ycombinator.com: https://news.ycombinator.com/item?id=10000000 (Goスケジューラに関する議論)
github.io: https://dave.cheney.net/2013/06/14/go-scheduler-part-1-goroutine-os-thread-processor-gmp-model (Goスケジューラに関する解説)
google.com: 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