Comments (1)
Flash attention added a deterministic flag since v2.4. For FA version >= 2.4, NVTE_ALLOW_NONDETERMINISTIC_ALGO=0
will automatically set this flag. For FA version < 2.4, you need to disable it.
NCCL_ALGO=NVLS
is only supported on platforms with NVLink switches. You can set NCCL_DEBUG=INFO
to check which algorithm is selected.
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Related Issues (20)
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