# Copyright 2023 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""Hal stream class"""
from mindspore._c_expression import Stream as Stream_
from mindspore._c_expression import set_cur_stream as set_cur_stream_
from mindspore._c_expression import synchronize as synchronize_
from mindspore._c_expression import current_stream as current_stream_
from mindspore._c_expression import default_stream as default_stream_
from mindspore import _checkparam as Validator
from .event import Event
[文档]class Stream(Stream_):
r"""
Wrapper around a device stream.
A device stream is a linear sequence of execution that belongs to a specific device,
independent from other streams.
For a quick start of using Stream, please refer to `Illustration of stream management <https://www.mindspore.cn/docs/en/r2.3.0rc2/api_python/samples/hal/stream_manager.html>`_ .
Args:
priority (int, optional): priority of the stream, lower numbers represent higher priorities.
By default, streams have priority ``0``.
kwargs (dict): keyword arguments.
"""
def __init__(self, priority=0, **kwargs):
self.init_finished = False
if 'stream' in kwargs and kwargs['stream'] is not None:
super().__init__(kwargs['stream'])
Validator.check_is_int(priority, 'priority', "Stream")
if 'stream_id' in kwargs:
Validator.check_is_int(kwargs['stream_id'], 'stream_id', "Stream")
super().__init__(priority, kwargs['stream_id'])
else:
super().__init__(priority)
self.init_finished = True
[文档] def record_event(self, event=None):
r"""
Records an event.
Args:
event (Event, optional): event to record. If not given, a new one
will be allocated.
Returns:
Event, recorded event. If this argument is ``None``, a new one will be allocated. Default is ``None``.
Raises:
TypeError: If 'event' is neither a :class:`mindspore.hal.Event` nor a ``None``.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([3, 3]), ms.float32)
>>> b = Tensor(np.ones([3, 3]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = a + b
... event = s1.record_event()
... d = a * b
>>> cur_stream = ms.hal.current_stream()
>>> cur_stream.wait_event(event)
>>> e = c + 3
>>> print(e)
[[5. 5. 5.]
[5. 5. 5.]
[5. 5. 5.]]
"""
if event is None:
event = Event()
if not isinstance(event, Event):
raise TypeError(f"For 'record_event', the argument 'event' should be Event,"
f" but got {type(event)}.")
event.record(self)
return event
[文档] def wait_event(self, event):
r"""
Makes all future work submitted to the stream wait for an event.
Args:
event (Event): an event to wait for.
Raises:
TypeError: If 'event' is not a :class:`mindspore.hal.Event`.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([3, 3]), ms.float32)
>>> b = Tensor(np.ones([3, 3]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = a + b
... event = s1.record_event()
... d = a * b
>>> cur_stream = ms.hal.current_stream()
>>> cur_stream.wait_event(event)
>>> e = c + 3
>>> print(e)
[[5. 5. 5.]
[5. 5. 5.]
[5. 5. 5.]]
"""
if not isinstance(event, Event):
raise TypeError(f"For 'wait_event', the argument 'event' should be Event,"
f" but got {type(event)}.")
event.wait(self)
[文档] def wait_stream(self, stream):
r"""
Synchronizes with another stream.
All future work submitted to this stream will wait until all kernels
submitted to a given stream at the time of call complete.
Args:
stream (Stream): a stream to synchronize.
Raises:
TypeError: If 'stream' is not a :class:`mindspore.hal.Stream`.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> s1 = ms.hal.Stream()
>>> s2 = ms.hal.Stream()
>>> a = Tensor(np.ones([1, 2]), ms.float32)
>>> b = Tensor(np.ones([2, 2]), ms.float32)
>>> with ms.hal.StreamCtx(s1):
... c = ops.matmul(a, b)
>>> with ms.hal.StreamCtx(s2):
... s2.wait_stream(s1)
... d = ops.matmul(c, b)
>>> ms.hal.synchronize()
>>> print(d)
[[4. 4.]]
"""
if not isinstance(stream, Stream):
raise TypeError(f"For 'wait_stream', the argument 'stream' should be Stream,"
f" but got {type(stream)}.")
self.wait_event(stream.record_event())
[文档] def synchronize(self):
r"""
Wait for all the kernels in this stream to complete.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([1024, 2048]), ms.float32)
>>> b = Tensor(np.ones([2048, 4096]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = ops.matmul(a, b)
>>> s1.synchronize()
>>> assert s1.query()
"""
# pylint: disable=useless-super-delegation
super().synchronize()
[文档] def query(self):
r"""
Checks if all the work submitted has been completed.
Returns:
A boolean indicating if all kernels in this stream are completed.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([1024, 2048]), ms.float32)
>>> b = Tensor(np.ones([2048, 4096]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = ops.matmul(a, b)
>>> s1.synchronize()
>>> assert s1.query()
"""
# pylint: disable=useless-super-delegation
return super().query()
def __eq__(self, other):
if not isinstance(other, Stream):
raise TypeError(f"For '__eq__', the argument 'other' should be Stream,"
f" but got {type(other)}.")
return super().__eq__(other)
def __hash__(self):
return hash((self.id, self.device_id))
def __repr__(self):
if self.init_finished:
return super().__repr__()
return ''
[文档]def synchronize():
r"""
Synchronize all streams on current device.(Each MindSpore process only occupies one device)
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([1024, 2048]), ms.float32)
>>> b = Tensor(np.ones([2048, 4096]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = ops.matmul(a, b)
>>> ms.hal.synchronize()
>>> assert s1.query()
"""
synchronize_()
[文档]def set_cur_stream(stream):
r"""
Sets the current stream.This is a wrapper API to set the stream.
Usage of this function is discouraged in favor of the ``stream`` context manager.
Args:
stream (Stream): selected stream. This function is a no-op
if this argument is ``None``.
Raises:
TypeError: If 'stream' is neither a :class:`mindspore.hal.Stream` nor a ``None``.
Examples:
>>> import mindspore as ms
>>> cur_stream = ms.hal.current_stream()
>>> assert cur_stream == ms.hal.default_stream()
>>> s1 = ms.hal.Stream()
>>> ms.hal.set_cur_stream(s1)
>>> assert ms.hal.current_stream() == s1
>>> ms.hal.set_cur_stream(ms.hal.default_stream())
"""
if stream is None:
return
if not isinstance(stream, Stream):
raise TypeError(f"For 'set_cur_stream', the argument 'stream' should be Stream,"
f" but got {type(stream)}.")
set_cur_stream_(stream)
[文档]def current_stream():
r"""
Return current stream used on this device.
Returns:
stream (Stream), current stream.
Examples:
>>> import mindspore as ms
>>> cur_stream = ms.hal.current_stream()
>>> assert cur_stream == ms.hal.default_stream()
"""
return Stream(stream=current_stream_())
[文档]def default_stream():
r"""
Return default stream on this device.
Returns:
stream (Stream), default stream.
Examples:
>>> import mindspore as ms
>>> cur_stream = ms.hal.current_stream()
>>> assert cur_stream == ms.hal.default_stream()
"""
return Stream(stream=default_stream_())
[文档]class StreamCtx():
r"""
Context-manager that selects a given stream.
All kernels queued within its context will be enqueued on a selected
stream.
Args:
ctx_stream (Stream): selected stream. This manager is a no-op if it's ``None``.
Raises:
TypeError: If 'stream' is neither a :class:`mindspore.hal.Stream` nor a ``None``.
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> a = Tensor(np.ones([1024, 2048]), ms.float32)
>>> b = Tensor(np.ones([2048, 4096]), ms.float32)
>>> s1 = ms.hal.Stream()
>>> with ms.hal.StreamCtx(s1):
... c = ops.matmul(a, b)
>>> ms.hal.synchronize()
>>> assert s1.query()
"""
def __init__(self, ctx_stream):
if ctx_stream is not None and not isinstance(ctx_stream, Stream):
raise TypeError(f"For 'StreamCtx', the argument 'ctx_stream' should be Stream,"
f" but got {type(ctx_stream)}.")
self.stream = ctx_stream
self.prev_stream = None
def __enter__(self):
if self.stream is None:
return
self.prev_stream = current_stream()
set_cur_stream(self.stream)
return
def __exit__(self, exc_type, exc_val, exc_tb):
if self.stream is None:
return
set_cur_stream(self.prev_stream)
return