perf: Increase remote cache upload chunk size from 8KB to 256KB#12568
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anthonyshew merged 1 commit intomainfrom Apr 6, 2026
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perf: Increase remote cache upload chunk size from 8KB to 256KB#12568anthonyshew merged 1 commit intomainfrom
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## Release v2.9.5-canary.3 Versioned docs: https://v2-9-5-canary-3.turborepo.dev ### Changes - release(turborepo): 2.9.5-canary.2 (#12566) (`8479f02`) - feat: Add circular package dependency detection to boundaries (#12567) (`217d486`) - perf: Increase remote cache upload chunk size from 8KB to 256KB (#12568) (`374f7a7`) Co-authored-by: Turbobot <turbobot@vercel.com>
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## Release v2.9.5-canary.4 Versioned docs: https://v2-9-5-canary-4.turborepo.dev ### Changes - perf: Increase remote cache upload chunk size from 8KB to 256KB (#12568) (`374f7a7`) - release(turborepo): 2.9.5-canary.3 (#12570) (`0387bad`) - perf: Parallelize `boundaries` checking with Rayon and cache DFS traversals (#12569) (`7830df4`) Co-authored-by: Turbobot <turbobot@vercel.com>
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## Release v2.9.5 Versioned docs: https://v2-9-5.turborepo.dev ### Changes - release(turborepo): 2.9.4 (#12559) (`20dfb78`) - feat: Replace package manager commands in scaffolded README files (#6747) (`8f6f012`) - release(turborepo): 2.9.5-canary.1 (#12564) (`891188e`) - chore: Remove top issues Slack notification (#12565) (`49e484f`) - release(turborepo): 2.9.5-canary.2 (#12566) (`8479f02`) - feat: Add circular package dependency detection to boundaries (#12567) (`217d486`) - perf: Increase remote cache upload chunk size from 8KB to 256KB (#12568) (`374f7a7`) - release(turborepo): 2.9.5-canary.3 (#12570) (`0387bad`) - perf: Parallelize `boundaries` checking with Rayon and cache DFS traversals (#12569) (`7830df4`) - release(turborepo): 2.9.5-canary.4 (#12571) (`53eb059`) - fix: Normalize CRLF line endings in file hashing to match git (#12572) (`1403c9e`) - release(turborepo): 2.9.5-canary.5 (#12574) (`f0e18d2`) - fix: Suppress telemetry alert when running on Vercel (#12576) (`ecb1040`) --------- Co-authored-by: Turbobot <turbobot@vercel.com>
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Summary
BytesCodec(8KB default) with a zero-copy chunked stream yielding 256KB slices, reducing per-chunk overhead ~32x for large artifact uploadsVec<u8>artifact body toBytes(Arc-backed) before the retry closure, eliminating a full deep-copy on each retry attemptWhy
The upload path streamed in-memory artifact data through
FramedRead+BytesCodec, which yields 8KB chunks by default. Each chunk acquires a mutex lock inUploadProgressand traverses the full hyper/reqwest body pipeline. For large artifacts (hundreds of MB), this creates tens of thousands of unnecessary iterations and lock acquisitions, capping throughput well below what the network can handle.How to test
The existing
turborepo-cachetest suite covers the upload round-trip path (test_http_cache,test_async_cache, etc.) and all 135 tests pass. For throughput verification, upload a large cache artifact (>100MB) and observe the reported upload speed in the turbo output.