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[CI Bug] Fix ci issue #40637, Kernels FusedMoE Layer Test (2 H100s): test_moe_layer.py::test_moe_layer #40639

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[CI Bug] Fix ci issue #40637, Kernels FusedMoE Layer Test (2 H100s): test_moe_layer.py::test_moe_layer #40639

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19 changes: 12 additions & 7 deletions tests/kernels/moe/test_moe_layer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1620,13 +1620,18 @@ def _parallel_worker(
else:
print("F", end="")
finally:
# DeepEP managers are not reliably reusable across many subtests in
# a single worker process. Tear them down after each DeepEP case so
# later subtests do not inherit stale communication state.
if test_config.backend in {
"deepep_low_latency",
"deepep_high_throughput",
}:
# Note: for some reason DeepEP buffers don't seem to be
# entirely reusable on B200. In order to work around this
# we clear the all2all manager's cache after each testpoint.
cap = current_platform.get_device_capability()
if (
cap is not None
and cap.major == 10
and (
test_config.backend == "deepep_low_latency"
or test_config.backend == "deepep_high_throughput"
)
):
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torch.accelerator.synchronize()
all2all_manager = get_ep_group().device_communicator.all2all_manager
if all2all_manager is not None:
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