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[zero++] Synchronize at the end of secondary partitioning and simplify the logic #5216

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merged 5 commits into from
Mar 1, 2024
Merged

[zero++] Synchronize at the end of secondary partitioning and simplify the logic #5216

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644a822
Synchronize at the end of secondary partitioning
ByronHsu Mar 1, 2024
18967fc
trim
ByronHsu Mar 1, 2024
d36ec0c
trim
ByronHsu Mar 1, 2024
9837fcc
simplify parition logic
ByronHsu Mar 1, 2024
00e76e9
only sync current stream
ByronHsu Mar 1, 2024
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3 changes: 3 additions & 0 deletions deepspeed/runtime/zero/partition_parameters.py
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Expand Up @@ -1649,6 +1649,9 @@ def _partition_param_sec(self, param, buffer=None, has_been_updated=False):
param.ds_secondary_tensor.narrow(0, 0, elements_to_copy_sec).copy_(
one_dim_param.narrow(0, secondary_start, elements_to_copy_sec))

# TODO: This is a temporary fix to avoid the issue that 2nd tensor all-gather happens before 2nd tensor partition is done
get_accelerator().synchronize()

print_rank_0(f"{param.ds_id} partitioned type {param.dtype} dev {param.device} shape {param.shape}",
force=False)

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