xref: /gem5/configs/topologies/Cluster.py

# Copyright (c) 2012 Advanced Micro Devices, Inc.
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# Authors: Jason Power


from BaseTopology import BaseTopology

class Cluster(BaseTopology):
    """ A cluster is a group of nodes which are all one hop from eachother
        Clusters can also contain other clusters
        When creating this kind of topology, return a single cluster (usually
        the root cluster) from create_system in configs/ruby/<protocol>.py
    """

    _num_int_links = 0
    _num_ext_links = 0
    _num_routers = 0

    # Below methods for auto counting
    @classmethod
    def num_int_links(cls):
        cls._num_int_links += 1
        return cls._num_int_links - 1
    @classmethod
    def num_ext_links(cls):
        cls._num_ext_links += 1
        return cls._num_ext_links - 1
    @classmethod
    def num_routers(cls):
        cls._num_routers += 1
        return cls._num_routers - 1

    def __init__(self, intBW=0, extBW=0, intLatency=0, extLatency=0):
        """ internalBandwidth is bandwidth of all links within the cluster
            externalBandwidth is bandwidth from this cluster to any cluster
                connecting to it.
            internal/externalLatency are similar
            **** When creating a cluster with sub-clusters, the sub-cluster
                 external bandwidth overrides the internal bandwidth of the
                 super cluster
        """
        self.nodes = []
        self.router = None # created in makeTopology
        self.intBW = intBW
        self.extBW = extBW
        self.intLatency = intLatency
        self.extLatency = extLatency

    def add(self, node):
        self.nodes.append(node)

    def makeTopology(self, options, IntLink, ExtLink, Router):
        """ Recursively make all of the links and routers
        """
        routers = []
        int_links = []
        ext_links = []

        # make a router to connect all of the nodes
        self.router = Router(router_id=self.num_routers())
        routers.append(self.router)
        for node in self.nodes:
            if type(node) == Cluster:
                subRouters, subIntLinks, subExtLinks = node.makeTopology(options, IntLink, ExtLink, Router)
                routers += subRouters
                int_links += subIntLinks
                ext_links += subExtLinks

                # connect this cluster to the router
                link = IntLink(link_id=self.num_int_links(), node_a=self.router, node_b=node.router)
                if node.extBW:
                    link.bandwidth_factor = node.extBW
                elif self.intBW: # if there is an interanl b/w for this node and no ext b/w to override
                    link.bandwidth_factor = self.intBW

                if node.extLatency:
                    link.latency = node.extLatency
                elif self.intLatency:
                    link.latency = self.intLatency

                int_links.append(link)
            else:
                # node is just a controller connect it to the router via a ext_link
                link = ExtLink(link_id=self.num_ext_links(), ext_node=node, int_node=self.router)
                if self.intBW:
                    link.bandwidth_factor = self.intBW
                if self.intLatency:
                    link.latency = self.intLatency

                ext_links.append(link)

        return routers, int_links, ext_links

    def __len__(self):
        return len([i for i in self.nodes if type(i) != Cluster]) + \
               sum([len(i) for i in self.nodes if type(i) == Cluster])