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authorMiroslav Miklus <mmiklus@cisco.com>2016-08-04 17:39:10 +0200
committerMiroslav Miklus <mmiklus@cisco.com>2016-08-06 05:40:37 +0000
commit76f724a0fcc1286f569422d9ebbbd2bdd0619f47 (patch)
treea41c67795742aada53237e19d7da011d344583fe /resources/libraries/python/CpuUtils.py
parent223017fbe03ab4f8f49c134b9e88ecb55168a180 (diff)
CSIT-338 CpuUtils - CPU layout
Extends node from topology file with "cpuinfo", this information can be defined in the topology file, or can be retrieved from the node. Change-Id: I913dba93daab3b41b36f3ab07f5c03ad46c659dd Signed-off-by: Miroslav Miklus <mmiklus@cisco.com>
Diffstat (limited to 'resources/libraries/python/CpuUtils.py')
-rw-r--r--resources/libraries/python/CpuUtils.py100
1 files changed, 100 insertions, 0 deletions
diff --git a/resources/libraries/python/CpuUtils.py b/resources/libraries/python/CpuUtils.py
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+# Copyright (c) 2016 Cisco and/or its affiliates.
+# 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.
+
+"""CPU utilities library"""
+
+from resources.libraries.python.ssh import SSH
+
+__all__ = ["CpuUtils"]
+
+class CpuUtils(object):
+ """CPU utilities"""
+
+ @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.
+ :rtype: int
+ """
+ try:
+ return int(string)
+ except ValueError:
+ return 0
+
+ @staticmethod
+ def get_cpu_layout_from_all_nodes(nodes):
+ """Retrieve cpu layout from all nodes, assuming all nodes
+ are Linux nodes.
+
+ :param nodes: DICT__nodes from Topology.DICT__nodes.
+ :type nodes: dict
+ """
+ ssh = SSH()
+ for node in nodes.values():
+ ssh.connect(node)
+ cmd = "lscpu -p"
+ ret, stdout, stderr = ssh.exec_command(cmd)
+# parsing of "lscpu -p" output:
+# # CPU,Core,Socket,Node,,L1d,L1i,L2,L3
+# 0,0,0,0,,0,0,0,0
+# 1,1,0,0,,1,1,1,0
+ if ret != 0:
+ raise RuntimeError(
+ "Failed to execute ssh command, ret: {} err: {}".format(
+ ret, stderr))
+ node['cpuinfo'] = list()
+ for line in stdout.split("\n"):
+ if len(line) > 0 and line[0] != "#":
+ node['cpuinfo'].append([CpuUtils.__str2int(x) for x in
+ line.split(",")])
+
+ @staticmethod
+ def cpu_node_count(node):
+ """Return count of numa nodes.
+
+ :param node: Targeted node.
+ :type node: dict
+ :return: Count of numa nodes.
+ :rtype: int
+ """
+ cpuinfo = node.get("cpuinfo")
+ if cpuinfo 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):
+ """Return node related list of CPU numbers.
+
+ :param node: Node dictionary with cpuinfo.
+ :param cpu_node: Numa node number.
+ :type node: int
+ :type cpu_node: int
+ :return: List of cpu numbers related to numa from argument.
+ :rtype: list of int
+ """
+ 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:
+ raise RuntimeError("Node cpuinfo not available.")
+
+ return cpulist