-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
topology.go
197 lines (171 loc) · 4.87 KB
/
topology.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/*
Copyright 2017 The Kubernetes Authors.
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.
*/
package topology
import (
"fmt"
"sort"
"github.com/golang/glog"
cadvisorapi "github.com/google/cadvisor/info/v1"
"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
)
// CPUDetails is a map from CPU ID to Core ID and Socket ID.
type CPUDetails map[int]CPUInfo
// CPUTopology contains details of node cpu, where :
// CPU - logical CPU, cadvisor - thread
// Core - physical CPU, cadvisor - Core
// Socket - socket, cadvisor - Node
type CPUTopology struct {
NumCPUs int
NumCores int
NumSockets int
CPUDetails CPUDetails
}
// CPUsPerCore returns the number of logical CPUs are associated with
// each core.
func (topo *CPUTopology) CPUsPerCore() int {
if topo.NumCores == 0 {
return 0
}
return topo.NumCPUs / topo.NumCores
}
// CPUsPerSocket returns the number of logical CPUs are associated with
// each socket.
func (topo *CPUTopology) CPUsPerSocket() int {
if topo.NumSockets == 0 {
return 0
}
return topo.NumCPUs / topo.NumSockets
}
// CPUInfo contains the socket and core IDs associated with a CPU.
type CPUInfo struct {
SocketID int
CoreID int
}
// KeepOnly returns a new CPUDetails object with only the supplied cpus.
func (d CPUDetails) KeepOnly(cpus cpuset.CPUSet) CPUDetails {
result := CPUDetails{}
for cpu, info := range d {
if cpus.Contains(cpu) {
result[cpu] = info
}
}
return result
}
// Sockets returns all of the socket IDs associated with the CPUs in this
// CPUDetails.
func (d CPUDetails) Sockets() cpuset.CPUSet {
b := cpuset.NewBuilder()
for _, info := range d {
b.Add(info.SocketID)
}
return b.Result()
}
// CPUsInSocket returns all of the logical CPU IDs associated with the
// given socket ID in this CPUDetails.
func (d CPUDetails) CPUsInSocket(id int) cpuset.CPUSet {
b := cpuset.NewBuilder()
for cpu, info := range d {
if info.SocketID == id {
b.Add(cpu)
}
}
return b.Result()
}
// Cores returns all of the core IDs associated with the CPUs in this
// CPUDetails.
func (d CPUDetails) Cores() cpuset.CPUSet {
b := cpuset.NewBuilder()
for _, info := range d {
b.Add(info.CoreID)
}
return b.Result()
}
// CoresInSocket returns all of the core IDs associated with the given
// socket ID in this CPUDetails.
func (d CPUDetails) CoresInSocket(id int) cpuset.CPUSet {
b := cpuset.NewBuilder()
for _, info := range d {
if info.SocketID == id {
b.Add(info.CoreID)
}
}
return b.Result()
}
// CPUs returns all of the logical CPU IDs in this CPUDetails.
func (d CPUDetails) CPUs() cpuset.CPUSet {
b := cpuset.NewBuilder()
for cpuID := range d {
b.Add(cpuID)
}
return b.Result()
}
// CPUsInCore returns all of the logical CPU IDs associated with the
// given core ID in this CPUDetails.
func (d CPUDetails) CPUsInCore(id int) cpuset.CPUSet {
b := cpuset.NewBuilder()
for cpu, info := range d {
if info.CoreID == id {
b.Add(cpu)
}
}
return b.Result()
}
// Discover returns CPUTopology based on cadvisor node info
func Discover(machineInfo *cadvisorapi.MachineInfo) (*CPUTopology, error) {
if machineInfo.NumCores == 0 {
return nil, fmt.Errorf("could not detect number of cpus")
}
CPUDetails := CPUDetails{}
numCPUs := machineInfo.NumCores
numPhysicalCores := 0
var coreID int
var err error
for _, socket := range machineInfo.Topology {
numPhysicalCores += len(socket.Cores)
for _, core := range socket.Cores {
if coreID, err = getUniqueCoreID(core.Threads); err != nil {
glog.Errorf("could not get unique coreID for socket: %d core %d threads: %v",
socket.Id, core.Id, core.Threads)
return nil, err
}
for _, cpu := range core.Threads {
CPUDetails[cpu] = CPUInfo{
CoreID: coreID,
SocketID: socket.Id,
}
}
}
}
return &CPUTopology{
NumCPUs: numCPUs,
NumSockets: len(machineInfo.Topology),
NumCores: numPhysicalCores,
CPUDetails: CPUDetails,
}, nil
}
// getUniqueCoreID computes coreId as the lowest cpuID
// for a given Threads []int slice. This will assure that coreID's are
// platform unique (opposite to what cAdvisor reports - socket unique)
func getUniqueCoreID(threads []int) (coreID int, err error) {
err = nil
if len(threads) == 0 {
return 0, fmt.Errorf("no cpus provided")
}
if len(threads) != cpuset.NewCPUSet(threads...).Size() {
return 0, fmt.Errorf("cpus provided are not unique")
}
tmpThreads := make([]int, len(threads))
copy(tmpThreads, threads)
sort.Ints(tmpThreads)
return tmpThreads[0], err
}