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122 lines
2.9 KiB
122 lines
2.9 KiB
package memprofiling
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import (
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"fmt"
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"net/http"
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"reflect"
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"runtime"
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"sync"
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"time"
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"github.com/fjl/memsize"
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"github.com/fjl/memsize/memsizeui"
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nodeconfig "github.com/harmony-one/harmony/internal/configs/node"
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"github.com/harmony-one/harmony/internal/utils"
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)
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// Constants for mem profiling.
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const (
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MemProfilingPortDiff = 1000
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// Constants of for scanning mem size.
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memSizeScanTime = 30 * time.Second
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// Run garbage collector every 30 minutes.
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gcTime = 10 * time.Minute
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)
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// MemProfiling is the struct to watch objects for memprofiling.
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type MemProfiling struct {
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h *memsizeui.Handler
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s *http.Server
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observedObject map[string]interface{}
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mu sync.Mutex
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}
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// New returns MemProfiling object.
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func New() *MemProfiling {
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return &MemProfiling{
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observedObject: map[string]interface{}{},
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h: new(memsizeui.Handler),
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}
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}
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// Config configures mem profiling.
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func (m *MemProfiling) Config() {
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m.s = &http.Server{
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Addr: fmt.Sprintf("%s:%s", nodeconfig.GetDefaultConfig().IP, utils.GetPortFromDiff(nodeconfig.GetDefaultConfig().Port, MemProfilingPortDiff)),
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Handler: m.h,
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}
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utils.GetLogInstance().Info("running mem profiling", "port", utils.GetPortFromDiff(nodeconfig.GetDefaultConfig().Port, MemProfilingPortDiff))
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}
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// Add adds variables to watch for profiling.
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func (m *MemProfiling) Add(name string, v interface{}) {
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m.mu.Lock()
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defer m.mu.Unlock()
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if v != nil {
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rv := reflect.ValueOf(v)
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if !(rv.Kind() != reflect.Ptr || rv.IsNil()) {
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m.h.Add(name, v)
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m.observedObject[name] = v
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}
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}
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}
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// Start starts profiling server.
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func (m *MemProfiling) Start() {
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go m.s.ListenAndServe()
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m.PeriodicallyScanMemSize()
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utils.GetLogInstance().Info("Start memprofiling.")
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}
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// Stop stops mem profiling.
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func (m *MemProfiling) Stop() {
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m.s.Shutdown(nil)
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}
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// PeriodicallyScanMemSize scans memsize of the observed objects every 30 seconds.
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func (m *MemProfiling) PeriodicallyScanMemSize() {
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go func() {
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for {
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select {
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case <-time.After(memSizeScanTime):
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m.mu.Lock()
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m := GetMemProfiling()
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for k, v := range m.observedObject {
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s := memsize.Scan(v)
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r := s.Report()
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utils.GetLogInstance().Info(fmt.Sprintf("memsize report for %s:\n %s", k, r))
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}
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m.mu.Unlock()
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}
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}
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}()
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}
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// MaybeCallGCPeriodically runs GC manually every gcTime minutes. This is one of the options to mitigate the OOM issue.
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func MaybeCallGCPeriodically() {
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go func() {
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for {
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select {
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case <-time.After(gcTime):
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PrintMemUsage("mem stats before GC")
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runtime.GC()
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PrintMemUsage("mem stats after GC")
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}
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}
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}()
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}
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// PrintMemUsage prints memory usage.
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func PrintMemUsage(msg string) {
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var m runtime.MemStats
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runtime.ReadMemStats(&m)
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utils.GetLogInstance().Info(msg,
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"alloc", bToMb(m.Alloc),
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"totalalloc", bToMb(m.TotalAlloc),
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"sys", bToMb(m.Sys),
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"numgc", m.NumGC)
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}
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func bToMb(b uint64) uint64 {
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return b / 1024 / 1024
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}
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