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comments cleanup etc

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Signed-off-by: Sage Moore <sage@neuralmagic.com>
This commit is contained in:
Sage Moore 2025-07-03 20:47:39 +00:00
parent 10ca263058
commit 82ae694de6
2 changed files with 15 additions and 23 deletions
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15
vllm/v1/worker/gpu_model_runner.py
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@ -593,6 +593,7 @@ class GPUModelRunner(LoRAModelRunnerMixin):
total_num_scheduled_tokens >= \
self.parallel_config.microbatching_token_threshold \
and max_num_scheduled_tokens == 1
# Don't microbatch unless every other DP worker is also microbatching
should_ubatch = self.should_ubatch(should_attempt_ubatching)
if not should_ubatch:
@ -611,20 +612,20 @@ class GPUModelRunner(LoRAModelRunnerMixin):
]
num_pad_tokens = 0
num_tokens_after_padding = None
ubatch_bailout = False
ubatch_abort = False
num_pad_tokens, num_tokens_after_padding = self.get_dp_padding_ubatch(ubatch_slices)
if num_pad_tokens > 0:
# Check if the padding would result in an empty second ubatch.
# If so abort ubatching
if num_pad_tokens < scheduler_output.total_num_scheduled_tokens:
self.pad_out_ubatch_first_stage(ubatch_slices, num_pad_tokens)
else:
# We bail out of ubatching here. This accounts for the case where
# the padding would result in an "empty" second ubatch.
# TODO: just make the second ubatch a dummy ubatch
ubatch_bailout = True
ubatch_abort = True
# Note that if we are attempting to ubatch by this point then we know that no
# DP ranks are doing dummy runs
should_ubatch = self.should_ubatch(False if ubatch_bailout else True)
# DP ranks are doing dummy runs. Meaning, we don't need a second call to
# should_ubatch in _dummy_run
should_ubatch = self.should_ubatch(False if ubatch_abort else True)
if not should_ubatch:
return (None, 0, None)
return (ubatch_slices, num_pad_tokens, num_tokens_after_padding)

23
vllm/v1/worker/ubatching.py
View File

@ -65,26 +65,16 @@ class UBatchContext:
self.current_stream = stream
torch.cuda.set_stream(self.current_stream)
def ctx_valid_state(self):
assert forward_context._forward_context == self.forward_context
assert current_stream() == self.current_stream
assert not self.cpu_wait_event.is_set()
pass
def _signal_comm_done(self):
self.ctx_valid_state()
self.gpu_comm_done_event.record(self.comm_stream)
def _signal_compute_done(self):
self.ctx_valid_state()
self.gpu_compute_done_event.record(self.compute_stream)
def _wait_compute_done(self):
self.ctx_valid_state()
self.comm_stream.wait_event(self.gpu_compute_done_event)
def _wait_comm_done(self):
self.ctx_valid_state()
self.compute_stream.wait_event(self.gpu_comm_done_event)
def stream_string(self):
@ -96,29 +86,30 @@ class UBatchContext:
return "COMM"
def _cpu_yield(self):
self.ctx_valid_state()
# It is critical for correctness that only one thread is running
# at a time. These asserts just make sure that this is the only
# thread running before waking the other one up and going to sleep
assert forward_context._forward_context == self.forward_context
assert current_stream() == self.current_stream
assert not self.cpu_wait_event.is_set()
self.cpu_signal_event.set()
self.cpu_wait_event.wait()
self.cpu_wait_event.clear()
self._restore_context()
self.ctx_valid_state()
def yield_and_switch_from_compute_to_comm(self):
assert current_stream() == self.compute_stream
self.ctx_valid_state()
self._signal_compute_done()
self._cpu_yield()
self.ctx_valid_state()
assert self.current_stream == self.compute_stream
self.update_stream(self.comm_stream)
self._wait_compute_done()
def yield_and_switch_from_comm_to_compute(self):
assert current_stream() == self.comm_stream
self.ctx_valid_state()
self._signal_comm_done()
self._cpu_yield()
self.ctx_valid_state()
assert self.current_stream == self.comm_stream
self.update_stream(self.compute_stream)
self._wait_comm_done()