from mininet.link import Link
import logging
+LOG = logging.getLogger("dcemulator")
+LOG.setLevel(logging.DEBUG)
+
DCDPID_BASE = 1000 # start of switch dpid's used for data center switches
def __init__(
self, name, dimage, **kwargs):
- logging.debug("Create EmulatorCompute instance: %s" % name)
self.datacenter = kwargs.get("datacenter") # pointer to current DC
self.flavor_name = kwargs.get("flavor_name")
-
+ LOG.debug("Starting compute instance %r in data center %r" % (name, str(self.datacenter)))
# call original Docker.__init__
Docker.__init__(self, name, dimage, **kwargs)
"""
self.switch = self.net.addSwitch(
"%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
- logging.debug("created data center switch: %s" % str(self.switch))
+ LOG.debug("created data center switch: %s" % str(self.switch))
def start(self):
pass
network.append({})
# allocate in resource resource model and compute resource limits for new container
+ cpu_limit = mem_limit = disk_limit = -1
+ cpu_period = cpu_quota = None
if self._resource_model is not None:
- # TODO pass resource limits to new container (cf. Dockernet API)
- cpu_limit, mem_limit, disk_limit = self._resource_model.allocate(name, flavor_name)
+ # call allocate in resource model to calculate resource limit for this container
+ (cpu_limit, mem_limit, disk_limit) = alloc = self._resource_model.allocate(name, flavor_name)
+ LOG.debug("Allocation result: %r" % str(alloc))
+ # check if we have a cpu_limit given by the used resource model
+ if cpu_limit > 0:
+ # calculate cpu period and quota for CFS
+ # (see: https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt)
+ # TODO consider multi core machines etc! non trivial!
+ # Attention minimum cpu_quota is 1ms (micro)
+ cpu_period = 100000 # lets consider a fixed period of 100000 microseconds for now
+ cpu_quota = cpu_period * cpu_limit # calculate the fraction of cpu time for this container
+ LOG.debug(
+ "CPU limit: cpu_quota = cpu_period * cpu_limit = %f * %f = %f" % (cpu_period, cpu_limit, cpu_quota))
+ # ATTENTION >= 1000 to avoid a invalid argument system error ... no idea why
+ if cpu_quota < 1000:
+ cpu_quota = 1000
+ LOG.warning("Increased CPU quota for %d to avoid system error." % name)
+ # TODO add memory and disc limitations
# create the container
d = self.net.addDocker(
"%s" % (name),
dimage=image,
dcmd=command,
datacenter=self,
- flavor_name=flavor_name)
+ flavor_name=flavor_name,
+ cpu_period=int(cpu_period) if cpu_limit > 0 else None, # set cpu limits if needed
+ cpu_quota=int(cpu_quota) if cpu_limit > 0 else None,
+ )
# connect all given networks
for nw in network:
# TODO we cannot use TCLink here (see: https://github.com/mpeuster/dockernet/issues/3)
}
def assignResourceModel(self, rm):
+ """
+ Assign a resource model to this DC.
+ :param rm: a BaseResourceModel object
+ :return:
+ """
if self._resource_model is not None:
raise Exception("There is already an resource model assigned to this DC.")
self._resource_model = rm
self.net.rm_registrar.register(self, rm)
- logging.info("Assigned RM: %r to DC: %r" % (rm, self))
+ LOG.info("Assigned RM: %r to DC: %r" % (rm, self))