trunk/e2d110a75ba155e0699f6de302a055154551e460: [distributed] Stabilize NCCL timeout tests (#194954)
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发生了什么
The timeout-extension test could enqueue its second work after the first extended timeout elapsed when ranks started unevenly. The asymmetric FX-cache test applied its short timeout to the initial cache warmup even though only the second phase exercises asymmetric compilation. Synchronize before the timeout window and delay the short timeout until the asymmetric phase. Test Plan: env CUDA_VISIBLE_DEVICES=0,1 NCCL_DE…
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