[Xet] Document adaptive concurrency for xet transfers (#2260)
* [Xet] Document adaptive concurrency for xet transfers
Describe the adaptive concurrency feature that xet-core uses by default
to dynamically adjust parallelism based on network conditions. Update
HF_XET_HIGH_PERFORMANCE documentation to reflect that it now raises
adaptive concurrency bounds (initial=16, max=124) rather than setting
fixed values. Add HF_XET_FIXED_DOWNLOAD/UPLOAD_CONCURRENCY as advanced
escape hatches.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* [Xet] Add environment variables reference for xet-core configuration
Add a comprehensive "Environment Variables" section to the Xet storage
docs covering adaptive concurrency, network/retry, data transfer,
download buffers, and logging. All variable names and defaults verified
against xet-core source.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* [Xet] Address review feedback: reframe HP mode as advanced option
- Clarify that default adaptive concurrency already saturates most
network paths — no tuning needed for most users
- Document HF_XET_HIGH_PERFORMANCE as requiring >=64 GB RAM, warn it
may degrade performance on smaller machines
- Mark adaptive concurrency env vars as advanced settings
- Fix AC_TARGET_RTT description per reviewer suggestion
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* [Xet] Address remaining review feedback from PR #2260
Remove redundant pip install line and fix code fence language tag.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
