[None][test] Optimize LLM test startup overhead#15777

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sunnyqgg wants to merge 12 commits into

NVIDIA:mainfrom

sunnyqgg:ci_time_opt

Commits on Jul 13, 2026

[None][test] Automatic MPI session reuse via shared pytest infrastructure
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[None][test] Opt eagle3 rejection-sampling test out of MPI session reuse
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[None][test] Opt AutoDeploy registry accuracy test out of MPI session reuse
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[None][test] Opt all AutoDeploy tests out of MPI session reuse
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[None][test] Harden session reuse against wedged worker pools
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[None][test] Retire wedged pools by SIGKILLing worker PIDs
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[None][test] Restrict SIGKILL disposal to broken pools only
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[None][test] Drain cached pools after any failed test item
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[None][test] Make drain threads daemonic
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[None][test] Guard the retire SIGKILL against PID recycling
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[None][test] Reap in-flight retire threads at drain points
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[None][test] Pin per-worker probe tasks with an MPI barrier
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