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86 lines
3.1 KiB
CoffeeScript
86 lines
3.1 KiB
CoffeeScript
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# record memory usage each minute and run a periodic gc(), keeping cpu
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# usage within allowable range of 1ms per minute. Also, dynamically
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# adjust the period between gc()'s to reach a target of the gc saving
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# 4 megabytes each time.
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oneMinute = 60 * 1000
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oneMegaByte = 1024 * 1024
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CpuTimeBucket = 100 # current cpu time allowance in milliseconds
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CpuTimeBucketMax = 100 # maximum amount of cpu time allowed in bucket
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CpuTimeBucketRate = 10 # add this many milliseconds per minute
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gcInterval = 1 # how many minutes between gc (parameter is dynamically adjusted)
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countSinceLastGc = 0 # how many minutes since last gc
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MemoryChunkSize = 4 # how many megabytes we need to free to consider gc worth doing
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readyToGc = () ->
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# update allowed cpu time
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CpuTimeBucket = CpuTimeBucket + CpuTimeBucketRate
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CpuTimeBucket = if CpuTimeBucket < CpuTimeBucketMax then CpuTimeBucket else CpuTimeBucketMax
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# update counts since last gc
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countSinceLastGc = countSinceLastGc + 1
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# check there is enough time since last gc and we have enough cpu
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return (countSinceLastGc > gcInterval) && (CpuTimeBucket > 0)
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executeAndTime = (fn) ->
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# time the execution of fn() and subtract from cpu allowance
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t0 = process.hrtime()
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fn()
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dt = process.hrtime(t0)
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timeTaken = (dt[0] + dt[1]*1e-9) * 1e3 # in milliseconds
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CpuTimeBucket -= Math.ceil timeTaken
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return timeTaken
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inMegaBytes = (obj) ->
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# convert process.memoryUsage hash {rss,heapTotal,heapFreed} into megabytes
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result = {}
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for k, v of obj
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result[k] = (v / oneMegaByte).toFixed(2)
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return result
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updateMemoryStats = (oldMem, newMem) ->
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countSinceLastGc = 0
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delta = {}
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for k of newMem
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delta[k] = (newMem[k] - oldMem[k]).toFixed(2)
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# take the max of all memory measures
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savedMemory = Math.max -delta.rss, -delta.heapTotal, -delta.heapUsed
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delta.megabytesFreed = savedMemory
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# did it do any good?
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if savedMemory < MemoryChunkSize
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gcInterval = gcInterval + 1 # no, so wait longer next time
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else
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gcInterval = Math.max gcInterval - 1, 1 # yes, wait less time
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return delta
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module.exports = MemoryMonitor =
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monitor: (logger) ->
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interval = setInterval () ->
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MemoryMonitor.Check(logger)
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, oneMinute
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Metrics = require "./metrics"
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Metrics.registerDestructor () ->
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clearInterval(interval)
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Check: (logger) ->
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Metrics = require "./metrics"
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memBeforeGc = mem = inMegaBytes process.memoryUsage()
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Metrics.gauge("memory.rss", mem.rss)
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Metrics.gauge("memory.heaptotal", mem.heapTotal)
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Metrics.gauge("memory.heapused", mem.heapUsed)
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Metrics.gauge("memory.gc-interval", gcInterval)
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#Metrics.gauge("memory.cpu-time-bucket", CpuTimeBucket)
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logger.log mem, "process.memoryUsage()"
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if global.gc? && readyToGc()
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gcTime = (executeAndTime global.gc).toFixed(2)
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memAfterGc = inMegaBytes process.memoryUsage()
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deltaMem = updateMemoryStats(memBeforeGc, memAfterGc)
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logger.log {gcTime, memBeforeGc, memAfterGc, deltaMem, gcInterval, CpuTimeBucket}, "global.gc() forced"
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#Metrics.timing("memory.gc-time", gcTime)
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Metrics.gauge("memory.gc-rss-freed", -deltaMem.rss)
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Metrics.gauge("memory.gc-heaptotal-freed", -deltaMem.heapTotal)
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Metrics.gauge("memory.gc-heapused-freed", -deltaMem.heapUsed)
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