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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Copyright 2022 PingCAP, Inc. | ||
| // | ||
| // 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 linux | ||
|
|
||
| package cgroup | ||
|
|
||
| import ( | ||
| "runtime" | ||
| "sync" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestGetCgroupCPU(t *testing.T) { | ||
| exit := make(chan struct{}) | ||
| var wg sync.WaitGroup | ||
| for i := 0; i < 10; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| for { | ||
| select { | ||
| case <-exit: | ||
| return | ||
| default: | ||
| runtime.Gosched() | ||
| } | ||
| } | ||
| }() | ||
| } | ||
| cpu, err := GetCgroupCPU() | ||
| require.NoError(t, err) | ||
| require.NotZero(t, cpu.Period) | ||
| require.Less(t, int64(1), cpu.Period) | ||
| close(exit) | ||
| wg.Wait() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test") | ||
|
|
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| go_library( | ||
| name = "cpu", | ||
| srcs = ["cpu.go"], | ||
| importpath = "github.com/pingcap/tidb/util/cpu", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "//util/cgroup", | ||
| "//util/mathutil", | ||
| "@com_github_cloudfoundry_gosigar//:gosigar", | ||
| "@com_github_pingcap_log//:log", | ||
| "@org_uber_go_atomic//:atomic", | ||
| "@org_uber_go_zap//:zap", | ||
| ], | ||
| ) | ||
|
|
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| go_test( | ||
| name = "cpu_test", | ||
| srcs = ["cpu_test.go"], | ||
| embed = [":cpu"], | ||
| deps = ["@com_github_stretchr_testify//require"], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Copyright 2022 PingCAP, Inc. | ||
| // | ||
| // 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 cpu | ||
|
|
||
| import ( | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
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| "github.com/cloudfoundry/gosigar" | ||
| "github.com/pingcap/log" | ||
| "github.com/pingcap/tidb/util/cgroup" | ||
| "github.com/pingcap/tidb/util/mathutil" | ||
| "go.uber.org/atomic" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
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| var cpuUsage atomic.Float64 | ||
|
|
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| // GetCPUUsage returns the cpu usage of the current process. | ||
| func GetCPUUsage() float64 { | ||
| return cpuUsage.Load() | ||
| } | ||
|
|
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| // Observer is used to observe the cpu usage of the current process. | ||
| type Observer struct { | ||
| utime int64 | ||
| stime int64 | ||
| now int64 | ||
| exit chan struct{} | ||
| cpu mathutil.ExponentialMovingAverage | ||
| wg sync.WaitGroup | ||
| } | ||
|
|
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| // NewCPUObserver returns a cpu observer. | ||
| func NewCPUObserver() *Observer { | ||
| return &Observer{ | ||
| exit: make(chan struct{}), | ||
| now: time.Now().UnixNano(), | ||
| cpu: *mathutil.NewExponentialMovingAverage(0.95, 10), | ||
| } | ||
| } | ||
|
|
||
| // Start starts the cpu observer. | ||
| func (c *Observer) Start() { | ||
| ticker := time.NewTicker(100 * time.Millisecond) | ||
| defer ticker.Stop() | ||
| c.wg.Add(1) | ||
| go func() { | ||
| defer c.wg.Done() | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| curr := c.observe() | ||
| c.cpu.Add(curr) | ||
| cpuUsage.Store(c.cpu.Get()) | ||
| case <-c.exit: | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| // Stop stops the cpu observer. | ||
| func (c *Observer) Stop() { | ||
| close(c.exit) | ||
| c.wg.Wait() | ||
| } | ||
|
|
||
| func (c *Observer) observe() float64 { | ||
| user, sys, err := getCPUTime() | ||
| if err != nil { | ||
| log.Error("getCPUTime", zap.Error(err)) | ||
| } | ||
| cgroupCPU, _ := cgroup.GetCgroupCPU() | ||
| cpuShare := cgroupCPU.CPUShares() | ||
| now := time.Now().UnixNano() | ||
| dur := float64(now - c.now) | ||
| utime := user * 1e6 | ||
| stime := sys * 1e6 | ||
| urate := float64(utime-c.utime) / dur | ||
| srate := float64(stime-c.stime) / dur | ||
| c.now = now | ||
| c.utime = utime | ||
| c.stime = stime | ||
| return (srate + urate) / cpuShare | ||
| } | ||
|
|
||
| // getCPUTime returns the cumulative user/system time (in ms) since the process start. | ||
| func getCPUTime() (userTimeMillis, sysTimeMillis int64, err error) { | ||
| pid := os.Getpid() | ||
| cpuTime := sigar.ProcTime{} | ||
| if err := cpuTime.Get(pid); err != nil { | ||
| return 0, 0, err | ||
| } | ||
| return int64(cpuTime.User), int64(cpuTime.Sys), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // Copyright 2022 PingCAP, Inc. | ||
| // | ||
| // 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 cpu | ||
|
|
||
| import ( | ||
| "runtime" | ||
| "sync" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestCPUValue(t *testing.T) { | ||
| Observer := NewCPUObserver() | ||
| Observer.Start() | ||
| exit := make(chan struct{}) | ||
| var wg sync.WaitGroup | ||
| for i := 0; i < 10; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| for { | ||
| select { | ||
| case <-exit: | ||
| return | ||
| default: | ||
| runtime.Gosched() | ||
| } | ||
| } | ||
| }() | ||
| } | ||
| time.Sleep(30 * time.Second) | ||
| require.Greater(t, Observer.observe(), 0.0) | ||
| require.Less(t, Observer.observe(), 1.0) | ||
| Observer.Stop() | ||
| close(exit) | ||
| wg.Wait() | ||
| } |