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Avoid multiple blocking calls by gathering UCX frames #5487

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Merged
quasiben merged 1 commit into from
Nov 4, 2021
Merged

Avoid multiple blocking calls by gathering UCX frames #5487

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31 changes: 19 additions & 12 deletions distributed/comm/ucx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@

.. _UCX: https://github.com/openucx/ucx
"""
import asyncio
import functools
import logging
import os
Expand Down Expand Up @@ -278,16 +279,6 @@ async def write(

# Send meta data

# Send close flag and number of frames (_Bool, int64)
await self.ep.send(struct.pack("?Q", False, nframes))
# Send which frames are CUDA (bool) and
# how large each frame is (uint64)
await self.ep.send(
struct.pack(nframes * "?" + nframes * "Q", *cuda_frames, *sizes)
)

# Send frames

# It is necessary to first synchronize the default stream before start
# sending We synchronize the default stream because UCX is not
# stream-ordered and syncing the default stream will wait for other
Expand All @@ -296,8 +287,22 @@ async def write(
if any(cuda_send_frames):
synchronize_stream(0)

tasks = []

# Send close flag and number of frames (_Bool, int64)
tasks.append(self.ep.send(struct.pack("?Q", False, nframes)))
# Send which frames are CUDA (bool) and
# how large each frame is (uint64)
tasks.append(
self.ep.send(
struct.pack(nframes * "?" + nframes * "Q", *cuda_frames, *sizes)
)
)

# Send frames
for each_frame in send_frames:
await self.ep.send(each_frame)
tasks.append(self.ep.send(each_frame))
await asyncio.gather(*tasks)
return sum(sizes)
except (ucp.exceptions.UCXBaseException):
self.abort()
Expand Down Expand Up @@ -354,8 +359,10 @@ async def read(self, deserializers=("cuda", "dask", "pickle", "error")):
if any(cuda_recv_frames):
synchronize_stream(0)

tasks = []
for each_frame in recv_frames:
await self.ep.recv(each_frame)
tasks.append(self.ep.recv(each_frame))
await asyncio.gather(*tasks)
msg = await from_frames(
frames,
deserialize=self.deserialize,
Expand Down