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numa.go
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numa.go
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/*
* Tencent is pleased to support the open source community by making Blueking Container Service available.
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* 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 cpusetdevice
// #cgo LDFLAGS: -lnuma
// #include <numa.h>
import "C"
import (
"fmt"
"strconv"
)
// ErrNumaNotAvailable error type for NUMA
var ErrNumaNotAvailable = fmt.Errorf("No NUMA support available on this system")
// IsNumaAvailable Is Numa available
func IsNumaAvailable() bool {
if int(C.numa_available()) >= 0 {
return true
}
return false
}
// NUMANodes Get Numa Nodes
func NUMANodes() ([]string, error) {
if !IsNumaAvailable() {
return nil, ErrNumaNotAvailable
}
maxnode := int(C.numa_max_node())
nodes := make([]string, 0, maxnode)
for i := 0; i <= maxnode; i++ {
if C.numa_bitmask_isbitset(C.numa_nodes_ptr, C.uint(i)) > 0 {
nodes = append(nodes, strconv.Itoa(i))
}
}
return nodes, nil
}
// NUMACPUsOfNode Get CPU slice from the specified Node
func NUMACPUsOfNode(node string) ([]string, error) {
if !IsNumaAvailable() {
return nil, ErrNumaNotAvailable
}
nodei, err := strconv.Atoi(node)
if err != nil {
return nil, fmt.Errorf("node %s is invalid", node)
}
mask := C.numa_allocate_cpumask()
defer C.numa_free_cpumask(mask)
rc := C.numa_node_to_cpus(C.int(nodei), mask)
maxCpus := NUMAConfiguredCPUs()
cpus := make([]string, 0, maxCpus)
if rc >= 0 {
for i := 0; i < maxCpus; i++ {
if C.numa_bitmask_isbitset(mask, C.uint(i)) > 0 {
cpus = append(cpus, strconv.Itoa(i))
}
}
} else {
return cpus, ErrNumaNotAvailable
}
return cpus, nil
}
// NUMAConfiguredCPUs get configure cpu number
func NUMAConfiguredCPUs() int {
return int(C.numa_num_configured_cpus())
}