Synnefo » snf-ganeti » ganeti-local

def _ParseNodeInfo(info):

  """Return information about the node.

  @return: a dict with the following keys (memory values in MiB):

        - memory_total: the total memory size on the node

        - memory_free: the available memory on the node for instances

        - nr_cpus: total number of CPUs

        - nr_nodes: in a NUMA system, the number of domains

        - nr_sockets: the number of physical CPU sockets in the node

        - hv_version: the hypervisor version in the form (major, minor)

  """

  result = {}

  cores_per_socket = threads_per_core = nr_cpus = None

  xen_major, xen_minor = None, None

  memory_total = None

  memory_free = None

  for line in info.splitlines():

    fields = line.split(":", 1)

    if len(fields) < 2:

      continue

    (key, val) = map(lambda s: s.strip(), fields)

    # Note: in Xen 3, memory has changed to total_memory

    if key in ("memory", "total_memory"):

      memory_total = int(val)

    elif key == "free_memory":

      memory_free = int(val)

    elif key == "nr_cpus":

      nr_cpus = result["cpu_total"] = int(val)

    elif key == "nr_nodes":

      result["cpu_nodes"] = int(val)

    elif key == "cores_per_socket":

      cores_per_socket = int(val)

    elif key == "threads_per_core":

      threads_per_core = int(val)

    elif key == "xen_major":

      xen_major = int(val)

    elif key == "xen_minor":

      xen_minor = int(val)

  if None not in [cores_per_socket, threads_per_core, nr_cpus]:

    result["cpu_sockets"] = nr_cpus / (cores_per_socket * threads_per_core)

  if memory_free is not None:

    result["memory_free"] = memory_free

  if memory_total is not None:

    result["memory_total"] = memory_total

  if not (xen_major is None or xen_minor is None):

    result[constants.HV_NODEINFO_KEY_VERSION] = (xen_major, xen_minor)

  return result

def _MergeInstanceInfo(info, fn):

  """Updates node information from L{_ParseNodeInfo} with instance info.

  @type info: dict

  @param info: Result from L{_ParseNodeInfo}

  @type fn: callable

  @param fn: Function returning result of running C{xm list}

  @rtype: dict

  """

  total_instmem = 0

  for (name, _, mem, vcpus, _, _) in fn(True):

    if name == _DOM0_NAME:

      info["memory_dom0"] = mem

      info["dom0_cpus"] = vcpus

    # Include Dom0 in total memory usage

    total_instmem += mem

  memory_free = info.get("memory_free")

  memory_total = info.get("memory_total")

  # Calculate memory used by hypervisor

  if None not in [memory_total, memory_free, total_instmem]:

    info["memory_hv"] = memory_total - memory_free - total_instmem

  return info

def _GetNodeInfo(info, fn):

  """Combines L{_MergeInstanceInfo} and L{_ParseNodeInfo}.

  """

  return _MergeInstanceInfo(_ParseNodeInfo(info), fn)

    @see: L{_GetNodeInfo} and L{_ParseNodeInfo}

    # TODO: Abstract running Xen command for testing

    return _GetNodeInfo(result.stdout, self._GetXmList)