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/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* Licensed 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 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(sigar: Sigar, 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(): 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(sigar: Sigar, instrumentFactory: InstrumentFactory): MemoryMetrics =
new MemoryMetrics(sigar, instrumentFactory)
}
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