package org.radargun.sysmonitor;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.util.concurrent.TimeUnit;
import org.radargun.reporting.Timeline;
import org.radargun.traits.JmxConnectionProvider;
/**
* @author Galder Zamarreno
*/
public class CpuUsageMonitor extends JmxMonitor {
private static final String CPU_USAGE = "CPU usage";
private static final String PROCESS_CPU_TIME_ATTR = "ProcessCpuTime";
long prevCpuTime;
long prevUpTime;
static {
PERCENT_FORMATTER.setMinimumFractionDigits(1);
PERCENT_FORMATTER.setMaximumIntegerDigits(3);
}
public CpuUsageMonitor(JmxConnectionProvider jmxConnectionProvider, Timeline timeline) {
super(jmxConnectionProvider, timeline);
}
public synchronized void run() {
try {
if (connection == null) {
log.warn("MBean connection is not open, cannot read CPU stats");
return;
}
long cpuTimeMultiplier = getCpuMultiplier(connection);
OperatingSystemMXBean os = ManagementFactory.newPlatformMXBeanProxy(connection,
ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME, OperatingSystemMXBean.class);
int procCount = os.getAvailableProcessors();
long jmxCpuTime = (Long) connection.getAttribute(OS_NAME, PROCESS_CPU_TIME_ATTR);
long cpuTime = jmxCpuTime * cpuTimeMultiplier;
long upTime = (Long) connection.getAttribute(RUNTIME_NAME, PROCESS_UP_TIME);
long upTimeDiff = TimeUnit.MILLISECONDS.toNanos(upTime - prevUpTime);
long procTimeDiff = (cpuTime - prevCpuTime) / procCount; // already in nanoseconds
double cpuUsage = Math.min(1d, Math.max(0d, (double) procTimeDiff / (double) upTimeDiff));
timeline.addValue(CPU_USAGE, new Timeline.Value(cpuUsage));
log.tracef("Current CPU usage: %.1f%%", 100 * cpuUsage);
prevCpuTime = cpuTime;
prevUpTime = upTime;
} catch (Exception e) {
log.error("Exception!", e);
}
}
@Override
public synchronized void start() {
super.start();
timeline.addValue(CPU_USAGE, new Timeline.Value(0));
}
@Override
public synchronized void stop() {
super.stop();
timeline.addValue(CPU_USAGE, new Timeline.Value(0));
}
}