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package kamon.system.sigar
import kamon.metric.GenericEntityRecorder
import kamon.metric.instrument.{ Memory, InstrumentFactory }
import org.hyperic.sigar.Sigar
/**
* System memory usage metrics, as reported by Sigar:
* - used: Total used system memory.
* - free: Total free system memory (e.g. Linux plus cached).
* - swap-used: Total used system swap..
* - swap-free: Total free system swap.
*/
class MemoryMetrics(instrumentFactory: InstrumentFactory) extends GenericEntityRecorder(instrumentFactory) with SigarMetric {
val used = histogram("memory-used", Memory.Bytes)
val cached = histogram("memory-cache-and-buffer", Memory.Bytes)
val free = histogram("memory-free", Memory.Bytes)
val total = histogram("memory-total", Memory.Bytes)
val swapUsed = histogram("swap-used", Memory.Bytes)
val swapFree = histogram("swap-free", Memory.Bytes)
def update(sigar: Sigar): Unit = {
val mem = sigar.getMem
val swap = sigar.getSwap
val cachedMemory = if (mem.getActualFree > mem.getFree) mem.getActualFree - mem.getFree else 0L
used.record(mem.getActualUsed)
free.record(mem.getActualFree)
cached.record(cachedMemory)
total.record(mem.getTotal)
swapUsed.record(swap.getUsed)
swapFree.record(swap.getFree)
}
}
object MemoryMetrics extends SigarMetricRecorderCompanion("memory") {
def apply(instrumentFactory: InstrumentFactory): MemoryMetrics =
new MemoryMetrics(instrumentFactory)
}
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