perf: use deque for FIFO queues in sequence parallel, superoffload, and compile#7880
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tohtana merged 1 commit intodeepspeedai:masterfrom Mar 1, 2026
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…nd compile Three files drain lists front-to-back via .pop(0): - ulysses_sp.py: micro_batches queue for sequence parallel data - superoffload_stage3.py: params_in_ipg_bucket_buffer for gradient bucketing - compile/backend.py: remaining_schedule for compile pass scheduling Each .pop(0) is O(n); switching to collections.deque with .popleft() gives O(1) front removal. Signed-off-by: g97iulio1609 <giulio97.leone@gmail.com>
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Friendly ping — CI is green and this is ready for review. Happy to address any feedback. Thanks! |
sfc-gh-truwase
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Problem
Three files use
.pop(0)for FIFO queue processing, which is O(n) per removal:ulysses_sp.py: Micro-batch queue for sequence parallel data shardingsuperoffload_stage3.py: Parameter buffer for IPG gradient bucketingcompile/backend.py: Compile pass schedule queueSolution
Switch to
collections.dequewith.popleft()for O(1) front removal.Changes
deepspeed/runtime/sequence_parallel/ulysses_sp.pymicro_batchesFIFO queuedeepspeed/runtime/superoffload/superoffload_stage3.pyparams_in_ipg_bucket_bufferdrain loopdeepspeed/compile/backend.pyremaining_schedulestep-by-step consumption