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         self.dc_alloc_mu = 0
  30         super(self.__class__, self).__init__()
  31
  32     def allocate(self, name, flavor_name):
  33         """
  34         Calculate resources for container with given flavor.
  35         :param name: Container name.
  36         :param flavor_name: Flavor name.
  37         :return:
  38         """
  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         self.allocated_compute_instances[name] = flavor_name
  44         # calc and return
  45         return self._allocate_cpu(fl), self._allocate_mem(fl), -1.0  # return 3tuple (cpu, memory, disk)
  46
  47     def free(self, name):
  48         """
  49         Free resources of given container.
  50         :param name: Container name.
  51         :return:
  52         """
  53         if name not in self.allocated_compute_instances:
  54             return False
  55         # bookkeeping
  56         self._free_cpu(self._flavors.get(self.allocated_compute_instances[name]))
  57         self._free_mem(self._flavors.get(self.allocated_compute_instances[name]))
  58         del self.allocated_compute_instances[name]
  59         # we don't have to calculate anything special here in this simple model
  60         return True
  61
  62     def get_state_dict(self):
  63         """
  64         Return the state of the resource model as simple dict.
  65         Helper method for logging functionality.
  66         :return:
  67         """
  68         r = dict()
  69         r["e_cpu"] = self.registrar.e_cpu
  70         r["e_mem"] = self.registrar.e_mem
  71         r["dc_max_cu"] = self.dc_max_cu
  72         r["dc_max_mu"] = self.dc_max_mu
  73         r["dc_alloc_cu"] = self.dc_alloc_cu
  74         r["dc_alloc_mu"] = self.dc_alloc_mu
  75         r["allocated_compute_instances"] = self.allocated_compute_instances
  76         return r
  77
  78     def _allocate_cpu(self, flavor):
  79         """
  80         Allocate CPU time.
  81         :param flavor: flavor dict
  82         :return: cpu time fraction
  83         """
  84         fl_cu = flavor.get("compute")
  85         # check for over provisioning
  86         if self.dc_alloc_cu + fl_cu > self.dc_max_cu:
  87             raise Exception("Not enough compute resources left.")
  88         self.dc_alloc_cu += fl_cu
  89         # get cpu time fraction for entire emulation
  90         e_cpu = self.registrar.e_cpu
  91         # calculate cpu time fraction of a single compute unit
  92         cu = float(e_cpu) / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)])
  93         # calculate cpu time fraction for container with given flavor
  94         return cu * fl_cu
  95
  96     def _free_cpu(self, flavor):
  97         """
  98         Free CPU allocation.
  99         :param flavor: flavor dict
 100         :return:
 101         """
 102         self.dc_alloc_cu -= flavor.get("compute")
 103
 104     def _allocate_mem(self, flavor):
 105         """
 106         Allocate mem.
 107         :param flavor: flavor dict
 108         :return: mem limit in MB
 109         """
 110         fl_mu = flavor.get("memory")
 111         # check for over provisioning
 112         if self.dc_alloc_mu + fl_mu > self.dc_max_mu:
 113             raise Exception("Not enough memory resources left.")
 114         self.dc_alloc_mu += fl_mu
 115         # get cpu time fraction for entire emulation
 116         e_mem = self.registrar.e_mem
 117         # calculate cpu time fraction of a single compute unit
 118         mu = float(e_mem) / sum([rm.dc_max_mu for rm in list(self.registrar.resource_models)])
 119         # calculate cpu time fraction for container with given flavor
 120         return mu * fl_mu
 121
 122     def _free_mem(self, flavor):
 123         """
 124         Free memory allocation
 125         :param flavor: flavor dict
 126         :return:
 127         """
 128         self.dc_alloc_mu -= flavor.get("memory")