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Merge pull request #20342 from Homebrew/document_homebrew_download_concurrency

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Document `HOMEBREW_DOWNLOAD_CONCURRENCY` environment variable
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Mike McQuaid 2025-07-31 12:06:32 +00:00 committed by GitHub
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3 changed files with 23 additions and 1 deletions
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8
Library/Homebrew/env_config.rb
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@ -182,6 +182,13 @@ module Homebrew
description: "Use this bearer token for authenticating with a Docker registry proxying GitHub Packages. " \
"Preferred over `$HOMEBREW_DOCKER_REGISTRY_BASIC_AUTH_TOKEN`.",
},
HOMEBREW_DOWNLOAD_CONCURRENCY: {
description: "If set, Homebrew will download in parallel using this many concurrent connections. " \
"Setting to `auto` will use twice the number of available CPU cores " \
"(what our benchmarks showed to produce the best performance). " \
"If set to `1` (the default), Homebrew will download in serial.",
default: 1,
},
HOMEBREW_EDITOR: {
description: "Use this editor when editing a single formula, or several formulae in the " \
"same directory." \
@ -633,7 +640,6 @@ module Homebrew
sig { returns(Integer) }
def download_concurrency
# TODO: document this variable when ready to publicly announce it.
concurrency = ENV.fetch("HOMEBREW_DOWNLOAD_CONCURRENCY", 1)
concurrency = if concurrency == "auto"
require "os"

9
docs/Manpage.md
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@ -4043,6 +4043,15 @@ command execution e.g. `$(cat file)`.
: Use this bearer token for authenticating with a Docker registry proxying
GitHub Packages. Preferred over `$HOMEBREW_DOCKER_REGISTRY_BASIC_AUTH_TOKEN`.
`HOMEBREW_DOWNLOAD_CONCURRENCY`
: If set, Homebrew will download in parallel using this many concurrent
connections. Setting to `auto` will use twice the number of available CPU
cores (what our benchmarks showed to produce the best performance). If set to
`1` (the default), Homebrew will download in serial.
*Default:* `1`.
`HOMEBREW_EDITOR`
: Use this editor when editing a single formula, or several formulae in the same

7
manpages/brew.1
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@ -2617,6 +2617,13 @@ Use this base64 encoded username and password for authenticating with a Docker r
\fBHOMEBREW_DOCKER_REGISTRY_TOKEN\fP
Use this bearer token for authenticating with a Docker registry proxying GitHub Packages\. Preferred over \fB$HOMEBREW_DOCKER_REGISTRY_BASIC_AUTH_TOKEN\fP\&\.
.TP
\fBHOMEBREW_DOWNLOAD_CONCURRENCY\fP
If set, Homebrew will download in parallel using this many concurrent connections\. Setting to \fBauto\fP will use twice the number of available CPU cores (what our benchmarks showed to produce the best performance)\. If set to \fB1\fP (the default), Homebrew will download in serial\.
.RS
.P
\fIDefault:\fP \fB1\fP\&\.
.RE
.TP
\fBHOMEBREW_EDITOR\fP
Use this editor when editing a single formula, or several formulae in the same directory\.
.RS