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/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.hardware.common;
import java.lang.management.ManagementFactory;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import oshi.hardware.CentralProcessor;
import oshi.util.ParseUtil;
/**
* A CPU as defined in Linux /proc.
*
* @author alessandro[at]perucchi[dot]org
* @author alessio.fachechi[at]gmail[dot]com
* @author widdis[at]gmail[dot]com
*/
@SuppressWarnings("restriction")
public abstract class AbstractCentralProcessor implements CentralProcessor {
private static final long serialVersionUID = 1L;
private static final Logger LOG = LoggerFactory.getLogger(AbstractCentralProcessor.class);
/**
* Instantiate an OperatingSystemMXBean for future convenience
*/
private static final java.lang.management.OperatingSystemMXBean OS_MXBEAN = ManagementFactory
.getOperatingSystemMXBean();
/**
* Calling OperatingSystemMxBean too rapidly results in NaN. Store the
* latest value to return if polling is too rapid
*/
private double lastCpuLoad = 0d;
/**
* Keep track of last CPU Load poll to OperatingSystemMXBean to ensure
* enough time has elapsed
*/
private long lastCpuLoadTime = 0;
/**
* Keep track whether MXBean supports Oracle JVM methods
*/
private boolean sunMXBean = false;
// Logical and Physical Processor Counts
protected int logicalProcessorCount = 0;
protected int physicalProcessorCount = 0;
// Maintain previous ticks to be used for calculating usage between them.
// System ticks
private long tickTime;
private long[] prevTicks;
private long[] curTicks;
// Per-processor ticks [cpu][type]
private long procTickTime;
private long[][] prevProcTicks;
private long[][] curProcTicks;
// Processor info
private String cpuVendor;
private String cpuName;
protected String cpuSerialNumber = null;
private String cpuIdentifier;
private String cpuStepping;
private String cpuModel;
private String cpuFamily;
private Long cpuVendorFreq;
private Boolean cpu64;
/**
* Create a Processor
*/
public AbstractCentralProcessor() {
initMXBean();
// Initialize processor counts
calculateProcessorCounts();
}
/**
* Initializes mxBean boolean
*/
private void initMXBean() {
try {
Class.forName("com.sun.management.OperatingSystemMXBean");
// Initialize CPU usage
this.lastCpuLoad = ((com.sun.management.OperatingSystemMXBean) OS_MXBEAN).getSystemCpuLoad();
this.lastCpuLoadTime = System.currentTimeMillis();
this.sunMXBean = true;
LOG.debug("Oracle MXBean detected.");
} catch (ClassNotFoundException e) {
LOG.debug("Oracle MXBean not detected.");
LOG.trace("", e);
}
}
/**
* Initializes tick arrays
*/
protected synchronized void initTicks() {
// Per-processor ticks
this.prevProcTicks = new long[this.logicalProcessorCount][TickType.values().length];
this.curProcTicks = new long[this.logicalProcessorCount][TickType.values().length];
updateProcessorTicks();
// Solaris relies on procTicks init before system ticks
// System ticks
this.prevTicks = new long[TickType.values().length];
this.curTicks = new long[TickType.values().length];
updateSystemTicks();
}
/**
* Updates logical and physical processor counts
*/
protected abstract void calculateProcessorCounts();
/**
* {@inheritDoc}
*/
@Override
public String getVendor() {
if (this.cpuVendor == null) {
setVendor("");
}
return this.cpuVendor;
}
/**
* {@inheritDoc}
*/
@Override
public void setVendor(String vendor) {
this.cpuVendor = vendor;
}
/**
* {@inheritDoc}
*/
@Override
public String getName() {
if (this.cpuName == null) {
setName("");
}
return this.cpuName;
}
/**
* {@inheritDoc}
*/
@Override
public void setName(String name) {
this.cpuName = name;
}
/**
* {@inheritDoc}
*/
@Override
public long getVendorFreq() {
if (this.cpuVendorFreq == null) {
Pattern pattern = Pattern.compile("@ (.*)$");
Matcher matcher = pattern.matcher(getName());
if (matcher.find()) {
String unit = matcher.group(1);
this.cpuVendorFreq = Long.valueOf(ParseUtil.parseHertz(unit));
} else {
this.cpuVendorFreq = Long.valueOf(-1L);
}
}
return this.cpuVendorFreq.longValue();
}
/**
* {@inheritDoc}
*/
@Override
public void setVendorFreq(long freq) {
this.cpuVendorFreq = Long.valueOf(freq);
}
/**
* {@inheritDoc}
*/
@Override
public String getIdentifier() {
if (this.cpuIdentifier == null) {
StringBuilder sb = new StringBuilder();
if (getVendor().contentEquals("GenuineIntel")) {
sb.append(isCpu64bit() ? "Intel64" : "x86");
} else {
sb.append(getVendor());
}
sb.append(" Family ").append(getFamily());
sb.append(" Model ").append(getModel());
sb.append(" Stepping ").append(getStepping());
setIdentifier(sb.toString());
}
return this.cpuIdentifier;
}
/**
* {@inheritDoc}
*/
@Override
public void setIdentifier(String identifier) {
this.cpuIdentifier = identifier;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isCpu64bit() {
if (this.cpu64 == null) {
setCpu64(false);
}
return this.cpu64;
}
/**
* {@inheritDoc}
*/
@Override
public void setCpu64(boolean value) {
this.cpu64 = Boolean.valueOf(value);
}
/**
* {@inheritDoc}
*/
@Override
public String getStepping() {
if (this.cpuStepping == null) {
if (this.cpuIdentifier == null) {
return "?";
}
setStepping(parseIdentifier("Stepping"));
}
return this.cpuStepping;
}
/**
* {@inheritDoc}
*/
@Override
public void setStepping(String stepping) {
this.cpuStepping = stepping;
}
/**
* {@inheritDoc}
*/
@Override
public String getModel() {
if (this.cpuModel == null) {
if (this.cpuIdentifier == null) {
return "?";
}
setModel(parseIdentifier("Model"));
}
return this.cpuModel;
}
/**
* {@inheritDoc}
*/
@Override
public void setModel(String model) {
this.cpuModel = model;
}
/**
* {@inheritDoc}
*/
@Override
public String getFamily() {
if (this.cpuFamily == null) {
if (this.cpuIdentifier == null) {
return "?";
}
setFamily(parseIdentifier("Family"));
}
return this.cpuFamily;
}
/**
* {@inheritDoc}
*/
@Override
public void setFamily(String family) {
this.cpuFamily = family;
}
/**
* Parses identifier string
*
* @param id
* the id to retrieve
* @return the string following id
*/
private String parseIdentifier(String id) {
String[] idSplit = getIdentifier().split("\\s+");
boolean found = false;
for (String s : idSplit) {
// If id string found, return next value
if (found) {
return s;
}
found = s.equals(id);
}
// If id string not found, return empty string
return "";
}
/**
* {@inheritDoc}
*/
@Override
public synchronized double getSystemCpuLoadBetweenTicks() {
// Check if > ~ 0.95 seconds since last tick count.
long now = System.currentTimeMillis();
LOG.trace("Current time: {} Last tick time: {}", now, this.tickTime);
if (now - this.tickTime > 950) {
// Enough time has elapsed.
updateSystemTicks();
}
// Calculate total
long total = 0;
for (int i = 0; i < this.curTicks.length; i++) {
total += this.curTicks[i] - this.prevTicks[i];
}
// Calculate idle from difference in idle and IOwait
long idle = this.curTicks[TickType.IDLE.getIndex()] + this.curTicks[TickType.IOWAIT.getIndex()]
- this.prevTicks[TickType.IDLE.getIndex()] - this.prevTicks[TickType.IOWAIT.getIndex()];
LOG.trace("Total ticks: {} Idle ticks: {}", total, idle);
return total > 0 && idle >= 0 ? (double) (total - idle) / total : 0d;
}
/**
* Updates system tick information. Stores in array with seven elements
* representing clock ticks or milliseconds (platform dependent) spent in
* User (0), Nice (1), System (2), Idle (3), IOwait (4), IRQ (5), and
* SoftIRQ (6) states. By measuring the difference between ticks across a
* time interval, CPU load over that interval may be calculated.
*/
protected void updateSystemTicks() {
LOG.trace("Updating System Ticks");
long[] ticks = getSystemCpuLoadTicks();
// Skip update if ticks is all zero.
// Iterate to find a nonzero tick value and return; this should quickly
// find a nonzero value if one exists and be fast in checking 0's
// through branch prediction if it doesn't
for (long tick : ticks) {
if (tick != 0) {
// We have a nonzero tick array, update and return!
this.tickTime = System.currentTimeMillis();
// Copy to previous
System.arraycopy(this.curTicks, 0, this.prevTicks, 0, this.curTicks.length);
System.arraycopy(ticks, 0, this.curTicks, 0, ticks.length);
return;
}
}
}
/**
* {@inheritDoc}
*/
@Override
public double getSystemCpuLoad() {
if (this.sunMXBean) {
long now = System.currentTimeMillis();
// If called too recently, return latest value
if (now - this.lastCpuLoadTime < 200) {
return this.lastCpuLoad;
}
this.lastCpuLoad = ((com.sun.management.OperatingSystemMXBean) OS_MXBEAN).getSystemCpuLoad();
this.lastCpuLoadTime = now;
return this.lastCpuLoad;
}
return getSystemCpuLoadBetweenTicks();
}
/**
* {@inheritDoc}
*/
@Override
public double getSystemLoadAverage() {
return getSystemLoadAverage(1)[0];
}
/**
* {@inheritDoc}
*/
@Override
public double[] getProcessorCpuLoadBetweenTicks() {
// Check if > ~ 0.95 seconds since last tick count.
long now = System.currentTimeMillis();
LOG.trace("Current time: {} Last tick time: {}", now, this.procTickTime);
if (now - this.procTickTime > 950) {
// Enough time has elapsed.
// Update latest
updateProcessorTicks();
}
double[] load = new double[this.logicalProcessorCount];
for (int cpu = 0; cpu < this.logicalProcessorCount; cpu++) {
long total = 0;
for (int i = 0; i < this.curProcTicks[cpu].length; i++) {
total += this.curProcTicks[cpu][i] - this.prevProcTicks[cpu][i];
}
// Calculate idle from difference in idle and IOwait
long idle = this.curProcTicks[cpu][TickType.IDLE.getIndex()]
+ this.curProcTicks[cpu][TickType.IOWAIT.getIndex()]
- this.prevProcTicks[cpu][TickType.IDLE.getIndex()]
- this.prevProcTicks[cpu][TickType.IOWAIT.getIndex()];
LOG.trace("CPU: {} Total ticks: {} Idle ticks: {}", cpu, total, idle);
// update
load[cpu] = total > 0 && idle >= 0 ? (double) (total - idle) / total : 0d;
}
return load;
}
/**
* Updates per-processor tick information. Stores in 2D array; an array for
* each logical processor with with seven elements representing clock ticks
* or milliseconds (platform dependent) spent in User (0), Nice (1), System
* (2), Idle (3), IOwait (4), IRQ (5), and SoftIRQ (6) states. By measuring
* the difference between ticks across a time interval, CPU load over that
* interval may be calculated.
*/
protected void updateProcessorTicks() {
LOG.trace("Updating Processor Ticks");
long[][] ticks = getProcessorCpuLoadTicks();
// Skip update if ticks is all zero.
// Iterate to find a nonzero tick value and return; this should quickly
// find a nonzero value if one exists and be fast in checking 0's
// through branch prediction if it doesn't
for (long[] tick : ticks) {
for (long element : tick) {
if (element == 0L) {
continue;
}
// We have a nonzero tick array, update and return!
this.procTickTime = System.currentTimeMillis();
// Copy to previous
for (int cpu = 0; cpu < this.logicalProcessorCount; cpu++) {
System.arraycopy(this.curProcTicks[cpu], 0, this.prevProcTicks[cpu], 0,
this.curProcTicks[cpu].length);
}
for (int cpu = 0; cpu < this.logicalProcessorCount; cpu++) {
System.arraycopy(ticks[cpu], 0, this.curProcTicks[cpu], 0, ticks[cpu].length);
}
return;
}
}
}
/**
* {@inheritDoc}
*/
@Override
public int getLogicalProcessorCount() {
return this.logicalProcessorCount;
}
/**
* {@inheritDoc}
*/
@Override
public int getPhysicalProcessorCount() {
return this.physicalProcessorCount;
}
@Override
public String toString() {
return getName();
}
}
