78 lines
2.5 KiB
Go
78 lines
2.5 KiB
Go
// Copyright 2015 The Chihaya Authors. All rights reserved.
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// Use of this source code is governed by the BSD 2-Clause license,
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// which can be found in the LICENSE file.
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package stats
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import "runtime"
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// BasicMemStats includes a few of the fields from runtime.MemStats suitable for
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// general logging.
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type BasicMemStats struct {
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// General statistics.
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Alloc uint64 // bytes allocated and still in use
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TotalAlloc uint64 // bytes allocated (even if freed)
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Sys uint64 // bytes obtained from system (sum of XxxSys in runtime)
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Lookups uint64 // number of pointer lookups
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Mallocs uint64 // number of mallocs
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Frees uint64 // number of frees
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// Main allocation heap statistics.
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HeapAlloc uint64 // bytes allocated and still in use
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HeapSys uint64 // bytes obtained from system
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HeapIdle uint64 // bytes in idle spans
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HeapInuse uint64 // bytes in non-idle span
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HeapReleased uint64 // bytes released to the OS
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HeapObjects uint64 // total number of allocated objects
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// Garbage collector statistics.
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PauseTotalNs uint64
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LatestPauseNs uint64
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}
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type memStatsPlaceholder interface{}
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// MemStatsWrapper wraps runtime.MemStats with an optionally less verbose JSON
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// representation. The JSON field names correspond exactly to the runtime field
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// names to avoid reimplementing the entire struct.
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type MemStatsWrapper struct {
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memStatsPlaceholder `json:"Memory"`
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basic *BasicMemStats
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cache *runtime.MemStats
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}
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func NewMemStatsWrapper(verbose bool) *MemStatsWrapper {
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stats := &MemStatsWrapper{cache: &runtime.MemStats{}}
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if verbose {
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stats.memStatsPlaceholder = stats.cache
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} else {
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stats.basic = &BasicMemStats{}
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stats.memStatsPlaceholder = stats.basic
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}
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return stats
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}
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// Update fetches the current memstats from runtime and resets the cache.
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func (s *MemStatsWrapper) Update() {
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runtime.ReadMemStats(s.cache)
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if s.basic != nil {
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// Gross, but any decent editor can generate this in a couple commands.
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s.basic.Alloc = s.cache.Alloc
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s.basic.TotalAlloc = s.cache.TotalAlloc
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s.basic.Sys = s.cache.Sys
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s.basic.Lookups = s.cache.Lookups
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s.basic.Mallocs = s.cache.Mallocs
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s.basic.Frees = s.cache.Frees
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s.basic.HeapAlloc = s.cache.HeapAlloc
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s.basic.HeapSys = s.cache.HeapSys
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s.basic.HeapIdle = s.cache.HeapIdle
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s.basic.HeapInuse = s.cache.HeapInuse
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s.basic.HeapReleased = s.cache.HeapReleased
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s.basic.HeapObjects = s.cache.HeapObjects
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s.basic.PauseTotalNs = s.cache.PauseTotalNs
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s.basic.LatestPauseNs = s.cache.PauseNs[(s.cache.NumGC+255)%256]
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}
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}
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