Source code for pacman.utilities.utility_objs.chip_counter
# Copyright (c) 2021 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 pacman.data import PacmanDataView
[docs]class ChipCounter(object):
"""
A counter of how many chips are needed to hold machine vertices.
This does not look at the fixed_locations of the vertices at all.
The value produced will be a (hopefully) worst-case estimate and should
not be used to decide failure in terms of space!
"""
__slots__ = [
# How many cores there are to be used on a chip
"__n_cores_per_chip",
# How much SDRAM there is to be used on a chip
"__sdram_per_chip",
# The number of cores free on the "current" chip
"__cores_free",
# The SDRAM free on the "current" chip
"__sdram_free",
# The number of chips used, including the current one
"__n_chips"]
def __init__(self, n_cores_per_chip=15, sdram_per_chip=100 * 1024 * 1024):
self.__n_cores_per_chip = n_cores_per_chip
self.__sdram_per_chip = sdram_per_chip
self.__cores_free = 0
self.__sdram_free = 0
self.__n_chips = 0
[docs] def add_core(self, resources):
sdram = resources.get_total_sdram(
PacmanDataView.get_plan_n_timestep())
if self.__cores_free == 0 or self.__sdram_free < sdram:
self.__n_chips += 1
self.__cores_free = self.__n_cores_per_chip
self.__sdram_free = self.__sdram_per_chip
self.__cores_free -= 1
self.__sdram_free -= sdram
@property
def n_chips(self):
"""
:rtype: int
"""
return self.__n_chips