[CI][AMD] Persist the openai-harmony tiktoken vocab cache across jobs - #51666
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AndreasKaratzas merged 6 commits intoAug 11, 2026
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openai-harmony downloads its tiktoken vocab on first use and caches it under $TMPDIR, which native AMD CI sets per job. Every job therefore re-downloads the file at request time with no retry, and a transient failure surfaces as a 500 in the middle of gpt-oss entrypoints tests. Point the cache at HF_HOME, which the script already requires to be a persistent volume, so only the first job downloads it. Signed-off-by: Stefan Koncarevic <stefan.koncarevic@amd.com>
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Co-authored-by: OpenAI Codex <codex@openai.com> Signed-off-by: Andreas Karatzas <akaratza@amd.com>
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Purpose
gpt-oss entrypoints tests can fail with a 500 in the middle of a run:
Seen in amd-ci #11876 (
mi355_1: Entrypoints Integration (API Server OpenAI - Part 2), commit 243c63b), where 4 of the 8TestGPTOSSChatcases failed. The server started fine; the very firstPOST /v1/chat/completionsfailed while rendering the harmony prompt.openai_harmonydoes not ship the tiktoken vocab. It downloads it on first use and caches it under$TMPDIR/tiktoken-rs-cache. Native AMD CI sets a job-localTMPDIR, so the cache is discarded after every job and each job re-downloads the file fromopenaipublic.blob.core.windows.netat request time, with no retry. Any blip there surfaces as a 500 mid-test.This points the cache at
HF_HOMEinstead, which the script already requires to be a persistent volume, matching how the Hub cache is handled. Only the first job ever downloads the file (3.6 MB); every later job reads it from disk and never touches the network.This is not a regression from a specific PR, the lazy download has been there since #22340. It is a long-standing dependency that the move to native execution now lets us cache.
Test Plan
bash -n .buildkite/scripts/hardware_ci/run-amd-test.shTMPDIR(i.e. that a job-localTMPDIRreally does throw the cache away):Test Result
TMPDIRas expected.fb374d419588a4632f3f557e76b4b70aebbca790, which is exactly the cached filename. A different vocab file means a different URL and therefore a different cache entry, so a version bump downloads fresh on its own and needs no manual cleanup.The original failure is a transient network error and is not reproducible on demand, so there is no before/after CI run for it. What the change removes is the per-job dependency on that download.
Essential Elements of an Effective PR Description Checklist
supported_models.mdandexamplesfor a new model.