pax_global_header00006660000000000000000000000064141066761030014516gustar00rootroot0000000000000052 comment=ce6ed4c574066004ab884122d989748388233cad numcpus-0.3.0/000077500000000000000000000000001410667610300132105ustar00rootroot00000000000000numcpus-0.3.0/.cirrus.yml000066400000000000000000000004541410667610300153230ustar00rootroot00000000000000env: CIRRUS_CLONE_DEPTH: 1 freebsd_12_task: freebsd_instance: image_family: freebsd-12-2 install_script: | pkg install -y git go GOBIN=$PWD/bin go get golang.org/dl/go1.17 bin/go1.17 download build_script: bin/go1.17 build -v ./... test_script: bin/go1.17 test -race ./... numcpus-0.3.0/.github/000077500000000000000000000000001410667610300145505ustar00rootroot00000000000000numcpus-0.3.0/.github/workflows/000077500000000000000000000000001410667610300166055ustar00rootroot00000000000000numcpus-0.3.0/.github/workflows/static-analysis.yml000066400000000000000000000010631410667610300224400ustar00rootroot00000000000000name: Static Analysis on: push: branches: - master pull_request: branches: - master jobs: check: runs-on: ubuntu-latest steps: - name: Install Go uses: actions/setup-go@v2 with: go-version: '1.16' - name: Check out code uses: actions/checkout@v2 - name: Install staticcheck run: go install honnef.co/go/tools/cmd/staticcheck@latest - name: Run staticcheck run: | staticcheck -version staticcheck -- ./... - name: Run go vet run: go vet ./... numcpus-0.3.0/.github/workflows/test.yml000066400000000000000000000022671410667610300203160ustar00rootroot00000000000000name: Tests on: push: branches: - master pull_request: branches: - master jobs: build-and-test: strategy: matrix: go-version: [1.15, 1.16, 1.17] os: [ubuntu-latest, macos-latest, windows-latest] runs-on: ${{ matrix.os }} steps: - name: Install Go uses: actions/setup-go@v2 with: go-version: ${{ matrix.go-version }} - name: Check out code uses: actions/checkout@v2 - name: Check formatting if: ${{ matrix.go-version == '1.17' && matrix.os == 'ubuntu-latest' }} run: diff -u <(echo -n) <(gofmt -d .) - name: Check Go modules if: ${{ matrix.go-version == '1.17' && matrix.os == 'ubuntu-latest' }} run: | go mod tidy git diff --exit-code - name: Build (cross-compile) if: matrix.os == 'ubuntu-latest' run: | GOOS=darwin go build ./... GOOS=dragonfly go build ./... GOOS=freebsd go build ./... GOOS=linux go build ./... GOOS=netbsd go build ./... GOOS=openbsd go build ./... GOOS=solaris go build ./... GOOS=windows go build ./... - name: Test (native) run: go test -v ./... numcpus-0.3.0/LICENSE000066400000000000000000000261261410667610300142240ustar00rootroot00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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See the License for the specific language governing permissions and limitations under the License. numcpus-0.3.0/README.md000066400000000000000000000030501410667610300144650ustar00rootroot00000000000000# numcpus [![Go Reference](https://pkg.go.dev/badge/github.com/tklauser/numcpus.svg)](https://pkg.go.dev/github.com/tklauser/numcpus) [![GitHub Action Status](https://github.com/tklauser/numcpus/workflows/Tests/badge.svg)](https://github.com/tklauser/numcpus/actions?query=workflow%3ATests) [![Go Report Card](https://goreportcard.com/badge/github.com/tklauser/numcpus)](https://goreportcard.com/report/github.com/tklauser/numcpus) Package numcpus provides information about the number of CPU in a system. It gets the number of CPUs (online, offline, present, possible, configured or kernel maximum) on a Linux, Darwin, FreeBSD, NetBSD, OpenBSD, DragonflyBSD or Solaris/Illumos system. On Linux, the information is retrieved by reading the corresponding CPU topology files in `/sys/devices/system/cpu`. Not all functions are supported on Darwin, FreeBSD, NetBSD, OpenBSD, DragonflyBSD and Solaris/Illumos. ## Usage ```Go package main import ( "fmt" "os" "github.com/tklauser/numcpus" ) func main() { online, err := numcpus.GetOnline() if err != nil { fmt.Fprintf(os.Stderr, "GetOnline: %v\n", err) } fmt.Printf("online CPUs: %v\n", online) possible, err := numcpus.GetPossible() if err != nil { fmt.Fprintf(os.Stderr, "GetPossible: %v\n", err) } fmt.Printf("possible CPUs: %v\n", possible) } ``` ## References * [Linux kernel sysfs documentation for CPU attributes](https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu) * [Linux kernel CPU topology documentation](https://www.kernel.org/doc/Documentation/cputopology.txt) numcpus-0.3.0/cmd/000077500000000000000000000000001410667610300137535ustar00rootroot00000000000000numcpus-0.3.0/cmd/numcpus/000077500000000000000000000000001410667610300154455ustar00rootroot00000000000000numcpus-0.3.0/cmd/numcpus/main.go000066400000000000000000000007301410667610300167200ustar00rootroot00000000000000package main import ( "fmt" "github.com/tklauser/numcpus" ) func main() { present, _ := numcpus.GetPresent() online, _ := numcpus.GetOnline() offline, _ := numcpus.GetOffline() possible, _ := numcpus.GetPossible() kernelMax, _ := numcpus.GetKernelMax() fmt.Printf("present: %v\n", present) fmt.Printf("online: %v\n", online) fmt.Printf("offline: %v\n", offline) fmt.Printf("possible: %v\n", possible) fmt.Printf("kernel_max: %v\n", kernelMax) } numcpus-0.3.0/example_test.go000066400000000000000000000026061410667610300162350ustar00rootroot00000000000000// Copyright 2018 Tobias Klauser // // 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 numcpus_test import ( "fmt" "os" "github.com/tklauser/numcpus" ) func ExampleGetOffline() { offline, err := numcpus.GetOffline() if err != nil { fmt.Fprintf(os.Stderr, "GetOffline: %v\n", err) } fmt.Printf("# of offline CPUs: %v\n", offline) } func ExampleGetOnline() { online, err := numcpus.GetOnline() if err != nil { fmt.Fprintf(os.Stderr, "GetOnline: %v\n", err) } fmt.Printf("# of online CPUs: %v\n", online) } func ExampleGetPossible() { possible, err := numcpus.GetPossible() if err != nil { fmt.Fprintf(os.Stderr, "GetPossible: %v\n", err) } fmt.Printf("# of possible CPUs: %v\n", possible) } func ExampleGetPresent() { present, err := numcpus.GetPresent() if err != nil { fmt.Fprintf(os.Stderr, "GetPresent: %v\n", err) } fmt.Printf("# of present CPUs: %v\n", present) } numcpus-0.3.0/go.mod000066400000000000000000000001511410667610300143130ustar00rootroot00000000000000module github.com/tklauser/numcpus go 1.11 require golang.org/x/sys v0.0.0-20210816074244-15123e1e1f71 numcpus-0.3.0/go.sum000066400000000000000000000003171410667610300143440ustar00rootroot00000000000000golang.org/x/sys v0.0.0-20210816074244-15123e1e1f71 h1:ikCpsnYR+Ew0vu99XlDp55lGgDJdIMx3f4a18jfse/s= golang.org/x/sys v0.0.0-20210816074244-15123e1e1f71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= numcpus-0.3.0/numcpus.go000066400000000000000000000045661410667610300152440ustar00rootroot00000000000000// Copyright 2018 Tobias Klauser // // 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 numcpus provides information about the number of CPU. // // It gets the number of CPUs (online, offline, present, possible or kernel // maximum) on a Linux, Darwin, FreeBSD, NetBSD, OpenBSD or DragonflyBSD // system. // // On Linux, the information is retrieved by reading the corresponding CPU // topology files in /sys/devices/system/cpu. // // Not all functions are supported on Darwin, FreeBSD, NetBSD, OpenBSD and // DragonflyBSD. package numcpus import "errors" // ErrNotSupported is the error returned when the function is not supported. var ErrNotSupported = errors.New("function not supported") // GetConfigured returns the number of CPUs configured on the system. This // function should return the same value as `getconf _SC_NPROCESSORS_CONF` on a // unix system. func GetConfigured() (int, error) { return getConfigured() } // GetKernelMax returns the maximum number of CPUs allowed by the kernel // configuration. This function is only supported on Linux systems. func GetKernelMax() (int, error) { return getKernelMax() } // GetOffline returns the number of offline CPUs, i.e. CPUs that are not online // because they have been hotplugged off or exceed the limit of CPUs allowed by // the kernel configuration (see GetKernelMax). This function is only supported // on Linux systems. func GetOffline() (int, error) { return getOffline() } // GetOnline returns the number of CPUs that are online and being scheduled. func GetOnline() (int, error) { return getOnline() } // GetPossible returns the number of possible CPUs, i.e. CPUs that // have been allocated resources and can be brought online if they are present. func GetPossible() (int, error) { return getPossible() } // GetPresent returns the number of CPUs present in the system. func GetPresent() (int, error) { return getPresent() } numcpus-0.3.0/numcpus_bsd.go000066400000000000000000000027171410667610300160700ustar00rootroot00000000000000// Copyright 2018 Tobias Klauser // // 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. //go:build darwin || dragonfly || freebsd || netbsd || openbsd // +build darwin dragonfly freebsd netbsd openbsd package numcpus import ( "runtime" "golang.org/x/sys/unix" ) func getConfigured() (int, error) { n, err := unix.SysctlUint32("hw.ncpu") return int(n), err } func getKernelMax() (int, error) { return 0, ErrNotSupported } func getOffline() (int, error) { return 0, ErrNotSupported } func getOnline() (int, error) { var n uint32 var err error switch runtime.GOOS { case "netbsd", "openbsd": n, err = unix.SysctlUint32("hw.ncpuonline") if err != nil { n, err = unix.SysctlUint32("hw.ncpu") } default: n, err = unix.SysctlUint32("hw.ncpu") } return int(n), err } func getPossible() (int, error) { n, err := unix.SysctlUint32("hw.ncpu") return int(n), err } func getPresent() (int, error) { n, err := unix.SysctlUint32("hw.ncpu") return int(n), err } numcpus-0.3.0/numcpus_linux.go000066400000000000000000000051321410667610300164510ustar00rootroot00000000000000// Copyright 2018 Tobias Klauser // // 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 numcpus import ( "io/ioutil" "os" "path/filepath" "strconv" "strings" "golang.org/x/sys/unix" ) const sysfsCPUBasePath = "/sys/devices/system/cpu" func getFromCPUAffinity() (int, error) { var cpuSet unix.CPUSet if err := unix.SchedGetaffinity(0, &cpuSet); err != nil { return 0, err } return cpuSet.Count(), nil } func readCPURange(file string) (int, error) { buf, err := ioutil.ReadFile(filepath.Join(sysfsCPUBasePath, file)) if err != nil { return 0, err } return parseCPURange(strings.Trim(string(buf), "\n ")) } func parseCPURange(cpus string) (int, error) { n := int(0) for _, cpuRange := range strings.Split(cpus, ",") { if len(cpuRange) == 0 { continue } rangeOp := strings.SplitN(cpuRange, "-", 2) first, err := strconv.ParseUint(rangeOp[0], 10, 32) if err != nil { return 0, err } if len(rangeOp) == 1 { n++ continue } last, err := strconv.ParseUint(rangeOp[1], 10, 32) if err != nil { return 0, err } n += int(last - first + 1) } return n, nil } func getConfigured() (int, error) { d, err := os.Open(sysfsCPUBasePath) if err != nil { return 0, err } defer d.Close() fis, err := d.Readdir(-1) if err != nil { return 0, err } count := 0 for _, fi := range fis { if name := fi.Name(); fi.IsDir() && strings.HasPrefix(name, "cpu") { _, err := strconv.ParseInt(name[3:], 10, 64) if err == nil { count++ } } } return count, nil } func getKernelMax() (int, error) { buf, err := ioutil.ReadFile(filepath.Join(sysfsCPUBasePath, "kernel_max")) if err != nil { return 0, err } n, err := strconv.ParseInt(strings.Trim(string(buf), "\n "), 10, 32) if err != nil { return 0, err } return int(n), nil } func getOffline() (int, error) { return readCPURange("offline") } func getOnline() (int, error) { if n, err := getFromCPUAffinity(); err == nil { return n, nil } return readCPURange("online") } func getPossible() (int, error) { return readCPURange("possible") } func getPresent() (int, error) { return readCPURange("present") } numcpus-0.3.0/numcpus_linux_test.go000066400000000000000000000031701410667610300175100ustar00rootroot00000000000000// Copyright 2018 Tobias Klauser // // 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 numcpus import "testing" func TestParseCPURange(t *testing.T) { testCases := []struct { cpus string n int }{ {"", 0}, {"0", 1}, {"0-1", 2}, {"0-7", 8}, {"1-7", 7}, {"1-15", 15}, {"0-3,7", 5}, {"0,2-4", 4}, {"0,2-4,7", 5}, {"0,2-4,7-15", 13}, } for _, tc := range testCases { n, err := parseCPURange(tc.cpus) if err != nil { t.Errorf("failed to parse CPU range: %v", err) } if n != tc.n { t.Errorf("parseCPURange(%q) = %d, expected %d", tc.cpus, n, tc.n) } } str := "invalid" _, err := parseCPURange(str) if err == nil { t.Errorf("parseCPURange(%q) unexpectedly succeeded", str) } } func TestGetFromCPUAffinity(t *testing.T) { nAffinity, err := getFromCPUAffinity() if err != nil { t.Fatalf("getFromCPUAffinity: %v", err) } cpus := "online" nSysfs, err := readCPURange(cpus) if err != nil { t.Fatalf("readCPURange(%q): %v", cpus, err) } if nAffinity != nSysfs { t.Errorf("getFromCPUAffinity() = %d, readCPURange(%q) = %d, want the same return value", nAffinity, cpus, nSysfs) } } numcpus-0.3.0/numcpus_solaris.go000066400000000000000000000025541410667610300167730ustar00rootroot00000000000000// Copyright 2021 Tobias Klauser // // 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. //go:build solaris // +build solaris package numcpus import "golang.org/x/sys/unix" // taken from /usr/include/sys/unistd.h const ( _SC_NPROCESSORS_CONF = 14 _SC_NPROCESSORS_ONLN = 15 _SC_NPROCESSORS_MAX = 516 ) func getConfigured() (int, error) { n, err := unix.Sysconf(_SC_NPROCESSORS_CONF) return int(n), err } func getKernelMax() (int, error) { n, err := unix.Sysconf(_SC_NPROCESSORS_MAX) return int(n), err } func getOffline() (int, error) { return 0, ErrNotSupported } func getOnline() (int, error) { n, err := unix.Sysconf(_SC_NPROCESSORS_ONLN) return int(n), err } func getPossible() (int, error) { n, err := unix.Sysconf(_SC_NPROCESSORS_CONF) return int(n), err } func getPresent() (int, error) { n, err := unix.Sysconf(_SC_NPROCESSORS_CONF) return int(n), err } numcpus-0.3.0/numcpus_test.go000066400000000000000000000060001410667610300162640ustar00rootroot00000000000000// Copyright 2019-2020 Tobias Klauser // // 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 numcpus_test import ( "bytes" "errors" "os/exec" "runtime" "strconv" "strings" "testing" "github.com/tklauser/numcpus" ) func testGetconf(t *testing.T, got int, name, getconfWhich string) { t.Helper() getconf, err := exec.LookPath("getconf") if err != nil { t.Skipf("getconf not found in PATH: %v", err) } cmd := exec.Command(getconf, getconfWhich) var out bytes.Buffer cmd.Stdout = &out if err := cmd.Run(); err != nil { t.Skipf("failed to invoke getconf: %v", err) } want, err := strconv.ParseInt(strings.TrimSpace(out.String()), 10, 64) if err != nil { t.Skipf("failed to parse getconf output: %v", err) } if got != int(want) { t.Errorf("%s returned %v, want %v (getconf %s)", name, got, want, getconfWhich) } } func TestGetConfigured(t *testing.T) { n, err := numcpus.GetConfigured() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetConfigured not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetConfigured: %v", err) } t.Logf("Configured = %v", n) testGetconf(t, n, "GetConfigured", "_NPROCESSORS_CONF") } func TestGetKernelMax(t *testing.T) { n, err := numcpus.GetKernelMax() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetKernelMax not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetKernelMax: %v", err) } t.Logf("KernelMax = %v", n) } func TestGetOffline(t *testing.T) { n, err := numcpus.GetOffline() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetOffline not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetOffline: %v", err) } t.Logf("Offline = %v", n) } func TestGetOnline(t *testing.T) { n, err := numcpus.GetOnline() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetOnline not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetOnline: %v", err) } t.Logf("Online = %v", n) testGetconf(t, n, "GetOnline", "_NPROCESSORS_ONLN") } func TestGetPossible(t *testing.T) { n, err := numcpus.GetPossible() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetPossible not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetPossible: %v", err) } t.Logf("Possible = %v", n) } func TestGetPresent(t *testing.T) { n, err := numcpus.GetPresent() if errors.Is(err, numcpus.ErrNotSupported) { t.Skipf("GetPresent not supported on %s", runtime.GOOS) } else if err != nil { t.Fatalf("GetPresent: %v", err) } t.Logf("Present = %v", n) } numcpus-0.3.0/numcpus_unsupported.go000066400000000000000000000022011410667610300176740ustar00rootroot00000000000000// Copyright 2021 Tobias Klauser // // 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. //go:build !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris // +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris package numcpus func getConfigured() (int, error) { return 0, ErrNotSupported } func getKernelMax() (int, error) { return 0, ErrNotSupported } func getOffline() (int, error) { return 0, ErrNotSupported } func getOnline() (int, error) { return 0, ErrNotSupported } func getPossible() (int, error) { return 0, ErrNotSupported } func getPresent() (int, error) { return 0, ErrNotSupported }