src/emuvim/dcemulator/resourcemodel/upb/simple.py

   1 """
   2 Playground for resource models created by University of Paderborn.
   3 """
   4 import logging
   5 from emuvim.dcemulator.resourcemodel import BaseResourceModel
   6
   7 LOG = logging.getLogger("rm.upb.simple")
   8 LOG.setLevel(logging.DEBUG)
   9
  10
  11 class UpbSimpleCloudDcRM(BaseResourceModel):
  12     """
  13     This will be an example resource model that limits the overall
  14     resources that can be deployed per data center.
  15     No over provisioning. Resources are fixed throughout entire container
  16     lifetime.
  17     """
  18
  19     def __init__(self, max_cu=32, max_mu=1024):
  20         """
  21         Initialize model.
  22         :param max_cu: Maximum number of compute units available in this DC.
  23         :param max_mu: Maximum memory of entire dc.
  24         :return:
  25         """
  26         self.dc_max_cu = max_cu
  27         self.dc_max_mu = max_mu
  28         self.dc_alloc_cu = 0
  29         super(self.__class__, self).__init__()
  30
  31     def allocate(self, name, flavor_name):
  32         """
  33         Calculate resources for container with given flavor.
  34         :param name: Container name.
  35         :param flavor_name: Flavor name.
  36         :return:
  37         """
  38         # TODO Add memory model calculation (split in private methods for each tuple component)
  39         # bookkeeping and flavor handling
  40         if flavor_name not in self._flavors:
  41             raise Exception("Flavor %r does not exist" % flavor_name)
  42         fl = self._flavors.get(flavor_name)
  43         fl_cu = fl.get("compute")
  44         self.allocated_compute_instances[name] = flavor_name
  45         # check for over provisioning
  46         if self.dc_alloc_cu + fl_cu > self.dc_max_cu:
  47             raise Exception("Not enough compute resources left.")
  48         self.dc_alloc_cu += fl_cu
  49         #
  50         # calculate cpu limitation:
  51         #
  52         # get cpu time fraction for entire emulation
  53         e_cpu = self.registrar.e_cpu
  54         # calculate cpu time fraction of a single compute unit
  55         cu = e_cpu / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)])
  56         # calculate cpu time fraction for container with given flavor
  57         c_ct = cu * fl_cu
  58         return c_ct, -1.0, -1.0  # return 3tuple (cpu, memory, disk)
  59
  60     def free(self, name):
  61         """
  62         Free resources of given container.
  63         :param name: Container name.
  64         :return:
  65         """
  66         if name not in self.allocated_compute_instances:
  67             return False
  68         # bookkeeping
  69         self.dc_alloc_cu -= self._flavors.get(self.allocated_compute_instances[name]).get("compute")
  70         del self.allocated_compute_instances[name]
  71         # we don't have to calculate anything special here in this simple model
  72         return True