Source code for pacman.model.graphs.machine.destination_segmented_sdram_machine_partition
# Copyright (c) 2019 The University of Manchester
#
# 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
#
# https://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.
from spinn_utilities.overrides import overrides
from pacman.exceptions import (
PacmanConfigurationException, PartitionMissingEdgesException,
PacmanValueError)
from pacman.model.graphs import AbstractSingleSourcePartition
from pacman.model.graphs.machine import (
AbstractSDRAMPartition, SDRAMMachineEdge)
[docs]class DestinationSegmentedSDRAMMachinePartition(
AbstractSingleSourcePartition, AbstractSDRAMPartition):
"""
An SDRAM partition that gives each edge its own slice of memory from a
contiguous block. The edges all have the same source vertex.
"""
__slots__ = [
# The sdram base address for this partition.
"_sdram_base_address",
]
def __init__(self, identifier, pre_vertex):
super().__init__(
pre_vertex=pre_vertex, identifier=identifier,
allowed_edge_types=SDRAMMachineEdge)
self._sdram_base_address = None
[docs] @overrides(AbstractSDRAMPartition.total_sdram_requirements)
def total_sdram_requirements(self):
return sum(edge.sdram_size for edge in self.edges)
@property
def sdram_base_address(self):
return self._sdram_base_address
@sdram_base_address.setter
def sdram_base_address(self, new_value):
if len(self.edges) == 0:
raise PartitionMissingEdgesException(
f"Partition {self} has no edges")
self._sdram_base_address = new_value
for edge in self.edges:
edge.sdram_base_address = new_value
new_value += edge.sdram_size
[docs] @overrides(AbstractSingleSourcePartition.add_edge)
def add_edge(self, edge):
if self._sdram_base_address is not None:
raise PacmanConfigurationException(
"Illegal attempt to add an edge after sdram_base_address set")
# safety check
if self._pre_vertex != edge.pre_vertex:
raise PacmanConfigurationException(
"The destination segmented SDRAM partition only accepts "
"1 pre-vertex")
# add
super().add_edge(edge)
[docs] @overrides(AbstractSDRAMPartition.get_sdram_base_address_for)
def get_sdram_base_address_for(self, vertex):
if self._pre_vertex == vertex:
return self._sdram_base_address
for edge in self._edges:
if edge.post_vertex == vertex:
return edge.sdram_base_address
raise PacmanValueError(f"Vertex {vertex} is not in this partition")
[docs] @overrides(AbstractSDRAMPartition.get_sdram_size_of_region_for)
def get_sdram_size_of_region_for(self, vertex):
if self._pre_vertex == vertex:
return self.total_sdram_requirements()
for edge in self._edges:
if edge.post_vertex == vertex:
return edge.sdram_size
raise PacmanValueError(f"Vertex {vertex} is not in this partition")