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LocalAI/docs
Adiraandlocalai-org-maint-bot ab52813342 feat(modelartifacts): support bounded parallel Hugging Face file downloads (#11162)
* feat(modelartifacts): support bounded parallel Hugging Face file downloads

Closes #11114.

Snapshot materialization fetched every file through the sequential
executor in DownloadFilesWithContext, so a repository split into many
shards spent most of its wall clock in per-file request latency rather
than moving bytes.

Add DownloadFilesWithConcurrency, an errgroup with SetLimit, and keep
DownloadFilesWithContext as a wrapper that passes a limit of 1. That
leaves the two non-artifact callers (core/gallery and the model config
loader) on exactly the path they had: tasks still run in slice order,
and the first failure still returns before any later task starts.

Only whole files run in parallel. A single file is never split, so the
.partial resume machinery and the per-file SHA check in
downloadTaskWithRetry are untouched.

Two details the parallel path forced:

- completedBytes becomes an atomic.Int64. Several AfterDownload hooks
  add to it while other files' progress callbacks read it; without this
  the race detector reports three races on the new specs.
- The caller's status callback is serialized. The sequential path gave
  it an implicit guarantee of never being entered twice at once, and it
  belongs to the caller, so the executor keeps that promise rather than
  pushing locking onto every caller. AfterDownload is deliberately not
  serialized -- it does the verify-and-promote work that parallelism
  exists to overlap.

Manifest order needed no work: each hook already writes its own
manifest.Files slot by snapshot index, so entries stay in snapshot
order whatever the completion order. A spec now pins that.

The default is 1, unchanged behaviour. A shared models volume is often
the bottleneck rather than the link, so raising it is a deployment
decision; --artifact-download-concurrency and
LOCALAI_ARTIFACT_DOWNLOAD_CONCURRENCY expose it on both `run` and
`models install`.

Not done here, per the issue: no chunk-level parallelism within a single
file, and no throughput measurements across concurrency 1/2/4/8 -- that
needs a representative sharded repo and a real link.

Assisted-by: Claude:claude-opus-5 go-test gofmt
Signed-off-by: Adira Denis Muhando <dennisadira@gmail.com>

* feat(modelartifacts): expose download concurrency in settings

Follow-up to review feedback on #11162:

- The CLI flag and docs no longer describe the limit as Hugging Face
  specific. It applies to any artifact source, as @mudler pointed out.
- artifact_download_concurrency is now a persisted runtime setting and
  is editable from the WebUI, so it can be changed without a restart.

The manager's limit becomes an atomic.Int64 behind
SetDownloadConcurrency, because a live runtime setting can be updated
while a materialization is already in flight. Injected materializers
stay compatible through an optional setter interface, so a manager that
does not implement it is simply left alone.

Verified before taking this on: go build, go vet and go test -race all
pass for pkg/modelartifacts, pkg/downloader and core/config. The React
UI builds with vite, artifact_download_concurrency is present in the
built Settings chunk, and eslint reports the same 8 pre-existing
warnings on Settings.jsx as it does without the change.

Implementation contributed by localai-org-maint-bot on the review
thread; reviewed, verified and signed off by me.

Assisted-by: Codex:gpt-5
Assisted-by: Claude:claude-opus-5 go-test vite eslint
Signed-off-by: Adira Denis Muhando <dennisadira@gmail.com>

---------

Signed-off-by: Adira Denis Muhando <dennisadira@gmail.com>
Co-authored-by: localai-org-maint-bot <bot-opensource@localaisrl.com>
2026-08-07 18:00:45 +02:00
..

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hugo: collected modules in 566 ms
hugo: collected modules in 578 ms
github.com/google/docsy-example github.com/google/docsy@v0.5.1-0.20221017155306-99eacb09ffb0
github.com/google/docsy-example github.com/google/docsy/dependencies@v0.5.1-0.20221014161617-be5da07ecff1
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github.com/google/docsy/dependencies@v0.5.1-0.20221014161617-be5da07ecff1 github.com/FortAwesome/Font-Awesome@v0.0.0-20220831210243-d3a7818c253f

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➜ hugo server

INFO 2021/01/21 21:07:55 Using config file: 
Building sites … INFO 2021/01/21 21:07:55 syncing static files to /
Built in 288 ms
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