# See the License for the specific language governing permissions and
# limitations under the License.
-"""CPU utilities library"""
+"""CPU utilities library."""
from resources.libraries.python.ssh import SSH
__all__ = ["CpuUtils"]
+
class CpuUtils(object):
"""CPU utilities"""
+ # Number of threads per core.
+ NR_OF_THREADS = 2
+
@staticmethod
def __str2int(string):
"""Conversion from string to integer, 0 in case of empty string.
:param string: Input string.
:type string: str
- :return: Integer converted from string, 0 in case of ValueError.
+ :returns: Integer converted from string, 0 in case of ValueError.
:rtype: int
"""
try:
except ValueError:
return 0
+ @staticmethod
+ def is_smt_enabled(cpu_info):
+ """Uses CPU mapping to find out if SMT is enabled or not. If SMT is
+ enabled, the L1d,L1i,L2,L3 setting is the same for two processors. These
+ two processors are two threads of one core.
+
+ :param cpu_info: CPU info, the output of "lscpu -p".
+ :type cpu_info: list
+ :returns: True if SMT is enabled, False if SMT is disabled.
+ :rtype: bool
+ """
+
+ cpu_mems = [item[-4:] for item in cpu_info]
+ cpu_mems_len = len(cpu_mems) / CpuUtils.NR_OF_THREADS
+ count = 0
+ for cpu_mem in cpu_mems[:cpu_mems_len]:
+ if cpu_mem in cpu_mems[cpu_mems_len:]:
+ count += 1
+ return bool(count == cpu_mems_len)
+
@staticmethod
def get_cpu_layout_from_all_nodes(nodes):
"""Retrieve cpu layout from all nodes, assuming all nodes
:param nodes: DICT__nodes from Topology.DICT__nodes.
:type nodes: dict
+ :raises RuntimeError: If the ssh command "lscpu -p" fails.
"""
ssh = SSH()
for node in nodes.values():
:param node: Targeted node.
:type node: dict
- :return: Count of numa nodes.
+ :returns: Count of numa nodes.
:rtype: int
+ :raises RuntimeError: If node cpuinfo is not available.
"""
- cpuinfo = node.get("cpuinfo")
- if cpuinfo is not None:
+ cpu_info = node.get("cpuinfo")
+ if cpu_info is not None:
return node["cpuinfo"][-1][3] + 1
else:
raise RuntimeError("Node cpuinfo not available.")
@staticmethod
- def cpu_list_per_node(node, cpu_node):
+ def cpu_list_per_node(node, cpu_node, smt_used=False):
"""Return node related list of CPU numbers.
:param node: Node dictionary with cpuinfo.
:param cpu_node: Numa node number.
- :type node: int
+ :param smt_used: True - we want to use SMT, otherwise false.
+ :type node: dict
:type cpu_node: int
- :return: List of cpu numbers related to numa from argument.
+ :type smt_used: bool
+ :returns: List of cpu numbers related to numa from argument.
:rtype: list of int
+ :raises RuntimeError: If node cpuinfo is not available or if SMT is not
+ enabled.
"""
+
cpu_node = int(cpu_node)
- cpuinfo = node.get("cpuinfo")
- cpulist = []
- if cpuinfo is not None:
- for cpu in cpuinfo:
- if cpu[3] == cpu_node:
- cpulist.append(cpu[0])
- else:
+ cpu_info = node.get("cpuinfo")
+ if cpu_info is None:
raise RuntimeError("Node cpuinfo not available.")
- return cpulist
+ smt_enabled = CpuUtils.is_smt_enabled(cpu_info)
+ if not smt_enabled and smt_used:
+ raise RuntimeError("SMT is not enabled.")
+
+ cpu_list = []
+ for cpu in cpu_info:
+ if cpu[3] == cpu_node:
+ cpu_list.append(cpu[0])
+
+ if not smt_enabled or smt_enabled and smt_used:
+ pass
+
+ if smt_enabled and not smt_used:
+ cpu_list_len = len(cpu_list)
+ cpu_list = cpu_list[:cpu_list_len / CpuUtils.NR_OF_THREADS]
+
+ return cpu_list
+
+ @staticmethod
+ def cpu_slice_of_list_per_node(node, cpu_node, skip_cnt=0, cpu_cnt=0,
+ smt_used=False):
+ """Return string of node related list of CPU numbers.
+
+ :param node: Node dictionary with cpuinfo.
+ :param cpu_node: Numa node number.
+ :param skip_cnt: Skip first "skip_cnt" CPUs.
+ :param cpu_cnt: Count of cpus to return, if 0 then return all.
+ :param smt_used: True - we want to use SMT, otherwise false.
+ :type node: dict
+ :type cpu_node: int
+ :type skip_cnt: int
+ :type cpu_cnt: int
+ :type smt_used: bool
+ :returns: Cpu numbers related to numa from argument.
+ :rtype: list
+ :raises RuntimeError: If we require more cpus than available.
+ """
+
+ cpu_list = CpuUtils.cpu_list_per_node(node, cpu_node, smt_used)
+
+ cpu_list_len = len(cpu_list)
+ if cpu_cnt + skip_cnt > cpu_list_len:
+ raise RuntimeError("cpu_cnt + skip_cnt > length(cpu list).")
+
+ if cpu_cnt == 0:
+ cpu_cnt = cpu_list_len - skip_cnt
+
+ if smt_used:
+ cpu_list_0 = cpu_list[:cpu_list_len / CpuUtils.NR_OF_THREADS]
+ cpu_list_1 = cpu_list[cpu_list_len / CpuUtils.NR_OF_THREADS:]
+ cpu_list = [cpu for cpu in cpu_list_0[skip_cnt:skip_cnt + cpu_cnt]]
+ cpu_list_ex = [cpu for cpu in
+ cpu_list_1[skip_cnt:skip_cnt + cpu_cnt]]
+ cpu_list.extend(cpu_list_ex)
+ else:
+ cpu_list = [cpu for cpu in cpu_list[skip_cnt:skip_cnt + cpu_cnt]]
+
+ return cpu_list
+
+ @staticmethod
+ def cpu_list_per_node_str(node, cpu_node, skip_cnt=0, cpu_cnt=0, sep=",",
+ smt_used=False):
+ """Return string of node related list of CPU numbers.
+
+ :param node: Node dictionary with cpuinfo.
+ :param cpu_node: Numa node number.
+ :param skip_cnt: Skip first "skip_cnt" CPUs.
+ :param cpu_cnt: Count of cpus to return, if 0 then return all.
+ :param sep: Separator, default: 1,2,3,4,....
+ :param smt_used: True - we want to use SMT, otherwise false.
+ :type node: dict
+ :type cpu_node: int
+ :type skip_cnt: int
+ :type cpu_cnt: int
+ :type sep: str
+ :type smt_used: bool
+ :returns: Cpu numbers related to numa from argument.
+ :rtype: str
+ """
+
+ cpu_list = CpuUtils.cpu_slice_of_list_per_node(node, cpu_node,
+ skip_cnt=skip_cnt,
+ cpu_cnt=cpu_cnt,
+ smt_used=smt_used)
+ return sep.join(str(cpu) for cpu in cpu_list)
+
+ @staticmethod
+ def cpu_range_per_node_str(node, cpu_node, skip_cnt=0, cpu_cnt=0, sep="-",
+ smt_used=False):
+ """Return string of node related range of CPU numbers, e.g. 0-4.
+
+ :param node: Node dictionary with cpuinfo.
+ :param cpu_node: Numa node number.
+ :param skip_cnt: Skip first "skip_cnt" CPUs.
+ :param cpu_cnt: Count of cpus to return, if 0 then return all.
+ :param sep: Separator, default: "-".
+ :param smt_used: True - we want to use SMT, otherwise false.
+ :type node: dict
+ :type cpu_node: int
+ :type skip_cnt: int
+ :type cpu_cnt: int
+ :type sep: str
+ :type smt_used: bool
+ :returns: String of node related range of CPU numbers.
+ :rtype: str
+ """
+
+ cpu_list = CpuUtils.cpu_slice_of_list_per_node(node, cpu_node,
+ skip_cnt=skip_cnt,
+ cpu_cnt=cpu_cnt,
+ smt_used=smt_used)
+ if smt_used:
+ cpu_list_len = len(cpu_list)
+ cpu_list_0 = cpu_list[:cpu_list_len / CpuUtils.NR_OF_THREADS]
+ cpu_list_1 = cpu_list[cpu_list_len / CpuUtils.NR_OF_THREADS:]
+ cpu_range = "{}{}{},{}{}{}".format(cpu_list_0[0], sep,
+ cpu_list_0[-1],
+ cpu_list_1[0], sep,
+ cpu_list_1[-1])
+ else:
+ cpu_range = "{}{}{}".format(cpu_list[0], sep, cpu_list[-1])
+
+ return cpu_range
Code Review / csit.git / blobdiff