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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.alibaba.metrics.os.windows;
import com.alibaba.metrics.CachedMetricSet;
import com.alibaba.metrics.Clock;
import com.alibaba.metrics.Metric;
import com.alibaba.metrics.MetricName;
import com.alibaba.metrics.PersistentGauge;
import com.alibaba.metrics.os.utils.FormatUtils;
import org.hyperic.sigar.Cpu;
import org.hyperic.sigar.SigarException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import static com.alibaba.metrics.os.utils.SystemInfoUtils.sigar;
public class CpuUsageGaugeSet extends CachedMetricSet {
private static final Logger logger = LoggerFactory.getLogger(CpuUsageGaugeSet.class);
private float[] cpuUsage;
private CpuInfo lastCollectedCpuInfo;
private enum CpuUsage {
USER, NICE, SYSTEM, IDLE, IOWAIT, IRQ, SOFTIRQ, STEAL, GUEST
}
/**
* The "procs_running" line gives the number of processes currently running on CPUs.
*/
private long processRunning;
/**
* The "procs_blocked" line gives the number of processes currently blocked, waiting for I/O to complete.
*/
private long processBlocked;
/**
* The "intr" line gives counts of interrupts serviced since boot time,
* for each of the possible system interrupts.
* The first column is the total of all interrupts serviced;
* each subsequent column is the total for that particular interrupt.
*/
private long totalInterrupts;
/**
* The number of interrupts per second between collection
* This is a equivalent implementation of 'in' in vmstat
* https://www.thomas-krenn.com/en/wiki/Linux_Performance_Measurements_using_vmstat
*/
private double interruptsRate;
/**
* The "ctxt" line gives the total number of context switches across all CPUs.
*/
private long totalContextSwitches;
/**
* The number of context switches per second between collection
* This is a equivalent implementation of 'cs' in vmstat
* https://www.thomas-krenn.com/en/wiki/Linux_Performance_Measurements_using_vmstat
*/
private double contextSwitchesRate;
private Map gauges = new HashMap();
public CpuUsageGaugeSet(long dataTTL, TimeUnit unit, Clock clock){
super(dataTTL, unit, clock);
cpuUsage = new float[CpuUsage.values().length];
lastCollectedCpuInfo = new CpuInfo();
populateMetrics();
}
public CpuUsageGaugeSet(long dataTTL, TimeUnit unit) {
this(dataTTL, unit, Clock.defaultClock());
}
@Override
public Map getMetrics() {
return gauges;
}
private float getUsage(long current, long last, CpuInfo curInfo, CpuInfo lastInfo) {
try {
float f = 100.0f * (current - last) / (curInfo.totalTime - lastInfo.totalTime);
return FormatUtils.formatFloat(f);
} catch (Exception e) {
return 0.0f;
}
}
private CpuInfo collectCpuInfo() {
//CpuPerc cpuList[] = sigar.getCpuPercList();
Cpu cpu = null;
try {
cpu = sigar.getCpu();
} catch (SigarException e) {
}
if (cpu == null){
return new CpuInfo();
}
CpuInfo info = new CpuInfo();
info.userTime = cpu.getUser();
info.niceTime = cpu.getNice();
info.systemTime = cpu.getSys();
info.idleTime = cpu.getIdle();
info.iowaitTime = cpu.getWait();
info.irqTime = cpu.getIrq();
info.softirqTime = cpu.getSoftIrq();
info.stealTime = cpu.getStolen();
info.totalTime = cpu.getTotal();
return info;
}
@Override
protected void getValueInternal() {
CpuInfo current = collectCpuInfo();
cpuUsage[CpuUsage.USER.ordinal()] =
getUsage(current.userTime, lastCollectedCpuInfo.userTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.NICE.ordinal()] =
getUsage(current.niceTime, lastCollectedCpuInfo.niceTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.SYSTEM.ordinal()] =
getUsage(current.systemTime, lastCollectedCpuInfo.systemTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.IDLE.ordinal()] =
getUsage(current.idleTime, lastCollectedCpuInfo.idleTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.IOWAIT.ordinal()] =
getUsage(current.iowaitTime, lastCollectedCpuInfo.iowaitTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.IRQ.ordinal()] =
getUsage(current.irqTime, lastCollectedCpuInfo.irqTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.SOFTIRQ.ordinal()] =
getUsage(current.softirqTime, lastCollectedCpuInfo.softirqTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.STEAL.ordinal()] =
getUsage(current.stealTime, lastCollectedCpuInfo.stealTime, current, lastCollectedCpuInfo);
cpuUsage[CpuUsage.GUEST.ordinal()] =
getUsage(current.guestTIme, lastCollectedCpuInfo.guestTIme, current, lastCollectedCpuInfo);
lastCollectedCpuInfo = current;
}
private void populateMetrics() {
gauges.put(MetricName.build("cpu.user"), new CpuGauge(CpuUsage.USER.ordinal()));
gauges.put(MetricName.build("cpu.nice"), new CpuGauge(CpuUsage.NICE.ordinal()));
gauges.put(MetricName.build("cpu.system"), new CpuGauge(CpuUsage.SYSTEM.ordinal()));
gauges.put(MetricName.build("cpu.idle"), new CpuGauge(CpuUsage.IDLE.ordinal()));
gauges.put(MetricName.build("cpu.iowait"), new CpuGauge(CpuUsage.IOWAIT.ordinal()));
gauges.put(MetricName.build("cpu.irq"), new CpuGauge(CpuUsage.IRQ.ordinal()));
gauges.put(MetricName.build("cpu.softirq"), new CpuGauge(CpuUsage.SOFTIRQ.ordinal()));
gauges.put(MetricName.build("cpu.steal"), new CpuGauge(CpuUsage.STEAL.ordinal()));
gauges.put(MetricName.build("cpu.guest"), new CpuGauge(CpuUsage.GUEST.ordinal()));
gauges.put(MetricName.build("interrupts"), new PersistentGauge() {
@Override
public Double getValue() {
refreshIfNecessary();
return interruptsRate;
}
});
gauges.put(MetricName.build("context_switches"), new PersistentGauge() {
@Override
public Double getValue() {
refreshIfNecessary();
return contextSwitchesRate;
}
});
gauges.put(MetricName.build("process.running"), new PersistentGauge() {
@Override
public Long getValue() {
refreshIfNecessary();
return processRunning;
}
});
gauges.put(MetricName.build("process.blocked"), new PersistentGauge() {
@Override
public Long getValue() {
refreshIfNecessary();
return processBlocked;
}
});
}
private class CpuGauge extends PersistentGauge {
private int index;
public CpuGauge(int index) {
this.index = index;
}
@Override
public Float getValue() {
try {
refreshIfNecessary();
return cpuUsage[index];
} catch (Exception e) {
return 0.0f;
}
}
}
private class CpuInfo {
/**
* user: normal processes executing in user mode
*/
long userTime;
/**
* nice: niced processes executing in user mode
*/
long niceTime;
/**
* system: processes executing in kernel mode
*/
long systemTime;
/**
* idle: twiddling thumbs
*/
long idleTime;
/**
* iowait: In a word, iowait stands for waiting for I/O to complete. But there
are several problems:
1. Cpu will not wait for I/O to complete, iowait is the time that a task is
waiting for I/O to complete. When cpu goes into idle state for
outstanding task io, another task will be scheduled on this CPU.
2. In a multi-core CPU, the task waiting for I/O to complete is not running
on any CPU, so the iowait of each CPU is difficult to calculate.
3. The value of iowait field in /proc/stat will decrease in certain
conditions.
So, the iowait is not reliable by reading from /proc/stat.
*/
long iowaitTime;
/**
* irq: servicing interrupts
*/
long irqTime;
/**
* softirq: servicing softirqs
*/
long softirqTime;
/**
* steal: involuntary wait, since 2.6.11
*/
long stealTime;
/**
* guest: running a normal guest, since 2.6.24
*/
long guestTIme;
/**
* Total time
*/
long totalTime;
}
}
