11411cc9c7
This patch moves instantiateTopology into Ruby.py and removes the mem/ruby/network/topologies directory. It also adds some extra inheritance to the topologies to clean up some issues in the existing topologies.
126 lines
5.5 KiB
Python
126 lines
5.5 KiB
Python
# Copyright (c) 2011 Advanced Micro Devices, Inc.
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# 2011 Massachusetts Institute of Technology
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Brad Beckmann
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# Tushar Krishna
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from m5.params import *
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from m5.objects import *
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from BaseTopology import SimpleTopology
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class Torus(SimpleTopology):
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description='Torus'
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def __init__(self, controllers):
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self.nodes = controllers
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# Makes a generic torus assuming an equal number of cache and directory cntrls
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# Assuming a folded-torus on-chip layout (as shown on gem5 wiki).
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# All links (including the wrap-around ones) are of equal length, double that
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# of a mesh. Thus, each link is assigned a latency of 2 cycles.
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def makeTopology(self, options, IntLink, ExtLink, Router):
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nodes = self.nodes
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num_routers = options.num_cpus
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num_rows = options.mesh_rows
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# There must be an evenly divisible number of cntrls to routers
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# Also, obviously the number or rows must be <= the number of routers
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cntrls_per_router, remainder = divmod(len(nodes), num_routers)
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assert(num_rows <= num_routers)
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num_columns = int(num_routers / num_rows)
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assert(num_columns * num_rows == num_routers)
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# Create the routers in the torus
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routers = [Router(router_id=i) for i in range(num_routers)]
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# link counter to set unique link ids
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link_count = 0
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# Add all but the remainder nodes to the list of nodes to be uniformly
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# distributed across the network.
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network_nodes = []
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remainder_nodes = []
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for node_index in xrange(len(nodes)):
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if node_index < (len(nodes) - remainder):
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network_nodes.append(nodes[node_index])
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else:
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remainder_nodes.append(nodes[node_index])
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# Connect each node to the appropriate router
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ext_links = []
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for (i, n) in enumerate(network_nodes):
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cntrl_level, router_id = divmod(i, num_routers)
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assert(cntrl_level < cntrls_per_router)
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ext_links.append(ExtLink(link_id=link_count, ext_node=n,
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int_node=routers[router_id]))
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link_count += 1
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# Connect the remainding nodes to router 0. These should only be
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# DMA nodes.
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for (i, node) in enumerate(remainder_nodes):
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assert(node.type == 'DMA_Controller')
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assert(i < remainder)
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ext_links.append(ExtLink(link_id=link_count, ext_node=node,
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int_node=routers[0]))
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link_count += 1
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# Create the torus links. First row (east-west) links then column
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# (north-south) links
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# column links are given higher weights to implement XY routing
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int_links = []
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for row in xrange(num_rows):
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for col in xrange(num_columns):
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west_id = col + (row * num_columns)
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if (col + 1 < num_columns):
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east_id = (col + 1) + (row * num_columns)
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else:
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east_id = (row * num_columns)
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int_links.append(IntLink(link_id=link_count,
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node_a=routers[east_id],
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node_b=routers[west_id],
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latency=2,
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weight=1))
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link_count += 1
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for col in xrange(num_columns):
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for row in xrange(num_rows):
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north_id = col + (row * num_columns)
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if (row + 1 < num_rows):
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south_id = col + ((row + 1) * num_columns)
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else:
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south_id = col
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int_links.append(IntLink(link_id=link_count,
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node_a=routers[north_id],
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node_b=routers[south_id],
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latency=2,
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weight=2))
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link_count += 1
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return routers, int_links, ext_links
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