X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=src%2Femuvim%2Fdcemulator%2Fresourcemodel%2Fupb%2Fsimple.py;h=5f260d6ccca31267f68d33933578d5fd68af22b1;hb=0d98d75450be28bba00ebabcd9041b4ae541f964;hp=1d30733ed4795b6be89f2b6d7e67ca0b82849d28;hpb=bb14dab5d7a07c0835da92c128b1a912e8b47b13;p=osm%2Fvim-emu.git diff --git a/src/emuvim/dcemulator/resourcemodel/upb/simple.py b/src/emuvim/dcemulator/resourcemodel/upb/simple.py old mode 100644 new mode 100755 index 1d30733..5f260d6 --- a/src/emuvim/dcemulator/resourcemodel/upb/simple.py +++ b/src/emuvim/dcemulator/resourcemodel/upb/simple.py @@ -1,14 +1,43 @@ """ +Copyright (c) 2015 SONATA-NFV and Paderborn University +ALL RIGHTS RESERVED. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION] +nor the names of its contributors may be used to endorse or promote +products derived from this software without specific prior written +permission. + +This work has been performed in the framework of the SONATA project, +funded by the European Commission under Grant number 671517 through +the Horizon 2020 and 5G-PPP programmes. The authors would like to +acknowledge the contributions of their colleagues of the SONATA +partner consortium (www.sonata-nfv.eu). +""" +""" Playground for resource models created by University of Paderborn. """ import time import json import logging -from emuvim.dcemulator.resourcemodel import BaseResourceModel +from emuvim.dcemulator.resourcemodel import BaseResourceModel, NotEnoughResourcesAvailable LOG = logging.getLogger("rm.upb.simple") LOG.setLevel(logging.DEBUG) +CPU_PERIOD = 1000000 + class UpbSimpleCloudDcRM(BaseResourceModel): """ @@ -35,7 +64,11 @@ class UpbSimpleCloudDcRM(BaseResourceModel): self.deactivate_mem_limit = deactivate_mem_limit self.single_cu = 0 self.single_mu = 0 - super(self.__class__, self).__init__() + self.cpu_op_factor = 1.0 # over provisioning factor + self.mem_op_factor = 1.0 + self.raise_no_cpu_resources_left = True + self.raise_no_mem_resources_left = True + super(UpbSimpleCloudDcRM, self).__init__() def allocate(self, d): """ @@ -59,8 +92,8 @@ class UpbSimpleCloudDcRM(BaseResourceModel): """ fl_cu = self._get_flavor(d).get("compute") # check for over provisioning - if self.dc_alloc_cu + fl_cu > self.dc_max_cu: - raise Exception("Not enough compute resources left.") + if self.dc_alloc_cu + fl_cu > self.dc_max_cu and self.raise_no_cpu_resources_left: + raise NotEnoughResourcesAvailable("Not enough compute resources left.") self.dc_alloc_cu += fl_cu def _allocate_mem(self, d): @@ -71,8 +104,8 @@ class UpbSimpleCloudDcRM(BaseResourceModel): """ fl_mu = self._get_flavor(d).get("memory") # check for over provisioning - if self.dc_alloc_mu + fl_mu > self.dc_max_mu: - raise Exception("Not enough memory resources left.") + if self.dc_alloc_mu + fl_mu > self.dc_max_mu and self.raise_no_mem_resources_left: + raise NotEnoughResourcesAvailable("Not enough memory resources left.") self.dc_alloc_mu += fl_mu def free(self, d): @@ -108,7 +141,7 @@ class UpbSimpleCloudDcRM(BaseResourceModel): """ Recalculate real resource limits for all allocated containers and apply them to their cgroups. - We have to recalculate for all to allow e.g. overprovisioning models. + We have to recalculate for all containers to allow e.g. over provisioning models. :return: """ for d in self._allocated_compute_instances.itervalues(): @@ -124,26 +157,43 @@ class UpbSimpleCloudDcRM(BaseResourceModel): :return: """ number_cu = self._get_flavor(d).get("compute") - # get cpu time fraction for entire emulation - e_cpu = self.registrar.e_cpu # calculate cpu time fraction of a single compute unit - self.single_cu = float(e_cpu) / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)]) + self.single_cu = self._compute_single_cu() # calculate cpu time fraction for container with given flavor - cpu_time_percentage = single_cu * number_cu - # calculate cpu period and quota for CFS + cpu_time_percentage = self.single_cu * number_cu + # calculate input values for CFS scheduler bandwidth limitation + cpu_period, cpu_quota = self._calculate_cpu_cfs_values(cpu_time_percentage) + # apply limits to container if changed + if d.cpu_period != cpu_period or d.cpu_quota != cpu_quota: + LOG.debug("Setting CPU limit for %r: cpu_quota = cpu_period * limit = %f * %f = %f (op_factor=%f)" % ( + d.name, cpu_period, cpu_time_percentage, cpu_quota, self.cpu_op_factor)) + d.updateCpuLimit(cpu_period=int(cpu_period), cpu_quota=int(cpu_quota)) + + def _compute_single_cu(self): + """ + Calculate percentage of CPU time of a singe CU unit. + :return: + """ + # get cpu time fraction for entire emulation + e_cpu = self.registrar.e_cpu + # calculate + return float(e_cpu) / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)]) + + def _calculate_cpu_cfs_values(self, cpu_time_percentage): + """ + Calculate cpu period and quota for CFS + :param cpu_time_percentage: percentage of overall CPU to be used + :return: cpu_period, cpu_quota + """ # (see: https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt) # Attention minimum cpu_quota is 1ms (micro) - cpu_period = 1000000 # lets consider a fixed period of 1000000 microseconds for now + cpu_period = CPU_PERIOD # lets consider a fixed period of 1000000 microseconds for now cpu_quota = cpu_period * cpu_time_percentage # calculate the fraction of cpu time for this container # 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 %r to avoid system error." % d.name) - # apply to container if changed - if d.cpu_period != cpu_period or d.cpu_quota != cpu_quota: - LOG.debug("Setting CPU limit for %r: cpu_quota = cpu_period * limit = %f * %f = %f" % ( - d.name, cpu_period, cpu_time_percentage, cpu_quota)) - d.updateCpuLimit(cpu_period=int(cpu_period), cpu_quota=int(cpu_quota)) + LOG.warning("Increased CPU quota to avoid system error.") + return cpu_period, cpu_quota def _apply_mem_limits(self, d): """ @@ -157,17 +207,26 @@ class UpbSimpleCloudDcRM(BaseResourceModel): # calculate amount of memory for a single mu self.single_mu = float(e_mem) / sum([rm.dc_max_mu for rm in list(self.registrar.resource_models)]) # calculate mem for given flavor - mem_limit = single_mu * number_mu + mem_limit = self.single_mu * number_mu + mem_limit = self._calculate_mem_limit_value(mem_limit) + # apply to container if changed + if d.mem_limit != mem_limit: + LOG.debug("Setting MEM limit for %r: mem_limit = %f MB (op_factor=%f)" % + (d.name, mem_limit/1024/1024, self.mem_op_factor)) + d.updateMemoryLimit(mem_limit=mem_limit) + + def _calculate_mem_limit_value(self, mem_limit): + """ + Calculate actual mem limit as input for cgroup API + :param mem_limit: abstract mem limit + :return: concrete mem limit + """ # ATTENTION minimum mem_limit per container is 4MB if mem_limit < 4: mem_limit = 4 - LOG.warning("Increased MEM limit for %r because it was less than 4.0 MB." % d.name) + LOG.warning("Increased MEM limit because it was less than 4.0 MB.") # to byte! - mem_limit = int(mem_limit*1024*1024) - # apply to container if changed - if d.mem_limit != mem_limit: - LOG.debug("Setting MEM limit for %r: mem_limit = %f MB" % (d.name, mem_limit/1024/1024)) - d.updateMemoryLimit(mem_limit=mem_limit) + return int(mem_limit*1024*1024) def get_state_dict(self): """ @@ -195,6 +254,8 @@ class UpbSimpleCloudDcRM(BaseResourceModel): r["dc_alloc_mu"] = self.dc_alloc_mu r["single_cu_percentage"] = self.single_cu r["single_mu_percentage"] = self.single_mu + r["cpu_op_factor"] = self.cpu_op_factor + r["mem_op_factor"] = self.mem_op_factor r["allocation_state"] = allocation_state return r @@ -228,3 +289,43 @@ class UpbSimpleCloudDcRM(BaseResourceModel): # append to logfile with open(path, "a") as f: f.write("%s\n" % json.dumps(l)) + + +class UpbOverprovisioningCloudDcRM(UpbSimpleCloudDcRM): + """ + This will be an example resource model that limits the overall + resources that can be deployed per data center. + Allows over provisioning. Might result in reducing resources of single + containers whenever a data-center is over provisioned. + """ + # TODO add parts for memory + def __init__(self, *args, **kvargs): + super(UpbOverprovisioningCloudDcRM, self).__init__(*args, **kvargs) + self.raise_no_cpu_resources_left = False + + def _compute_single_cu(self): + """ + Calculate percentage of CPU time of a singe CU unit. + Take scale-down facte for over provisioning into account. + :return: + """ + # get cpu time fraction for entire emulation + e_cpu = self.registrar.e_cpu + # calculate over provisioning scale factor + self.cpu_op_factor = float(self.dc_max_cu) / (max(self.dc_max_cu, self.dc_alloc_cu)) + # calculate + return float(e_cpu) / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)]) * self.cpu_op_factor + + +class UpbDummyRM(UpbSimpleCloudDcRM): + """ + No limits. But log allocations. + """ + def __init__(self, *args, **kvargs): + super(UpbDummyRM, self).__init__(*args, **kvargs) + self.raise_no_cpu_resources_left = False + + def _apply_limits(self): + # do nothing here + pass +