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package kamon.system.sigar
import kamon.metric.GenericEntityRecorder
import kamon.metric.instrument.InstrumentFactory
import org.hyperic.sigar.{ ProcCpu, Sigar }
class ProcessCpuMetrics(sigar: Sigar, instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) with SigarMetric {
val processUserCpu = histogram("process-user-cpu")
val processSystemCpu = histogram("process-system-cpu")
val processTotalCpu = histogram("process-cpu")
var lastProcCpu: Option[ProcCpu] = None
def update(): Unit = {
val pid = sigar.getPid
val procCpu = sigar.getProcCpu(pid)
lastProcCpu.map { last ⇒
val timeDiff = procCpu.getLastTime - last.getLastTime
if (timeDiff > 0) {
val userPercent = (((procCpu.getUser - last.getUser) / timeDiff.toDouble) * 100).toLong
val systemPercent = (((procCpu.getSys - last.getSys) / timeDiff.toDouble) * 100).toLong
processUserCpu.record(userPercent)
processSystemCpu.record(systemPercent)
processTotalCpu.record(userPercent + systemPercent)
}
}
lastProcCpu = Some(procCpu)
}
}
object ProcessCpuMetrics extends SigarMetricRecorderCompanion("process-cpu") {
def apply(sigar: Sigar, instrumentFactory: InstrumentFactory): ProcessCpuMetrics =
new ProcessCpuMetrics(sigar, instrumentFactory)
}
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