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Merge pull request #1172 from syncthing/random-scanintv

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Add a random perturbation to the scan interval (fixes #1150)
This commit is contained in:
Audrius Butkevicius 2015-01-02 15:25:22 +00:00
commit 9c6cb0f630
2 changed files with 11 additions and 3 deletions
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9
internal/model/puller.go
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@ -21,6 +21,7 @@ import (
"errors"
"fmt"
"io/ioutil"
"math/rand"
"os"
"path/filepath"
"sync"
@ -225,10 +226,14 @@ loop:
}
p.model.setState(p.folder, FolderIdle)
if p.scanIntv > 0 {
// Sleep a random time between 3/4 and 5/4 of the configured interval.
sleepNanos := (p.scanIntv.Nanoseconds()*3 + rand.Int63n(2*p.scanIntv.Nanoseconds())) / 4
intv := time.Duration(sleepNanos) * time.Nanosecond
if debug {
l.Debugln(p, "next rescan in", p.scanIntv)
l.Debugln(p, "next rescan in", intv)
}
scanTimer.Reset(p.scanIntv)
scanTimer.Reset(intv)
}
if !initialScanCompleted {
l.Infoln("Completed initial scan (rw) of folder", p.folder)

5
internal/model/scanner.go
View File

@ -17,6 +17,7 @@ package model
import (
"fmt"
"math/rand"
"time"
)
@ -63,7 +64,9 @@ func (s *Scanner) Serve() {
return
}
timer.Reset(s.intv)
// Sleep a random time between 3/4 and 5/4 of the configured interval.
sleepNanos := (s.intv.Nanoseconds()*3 + rand.Int63n(2*s.intv.Nanoseconds())) / 4
timer.Reset(time.Duration(sleepNanos) * time.Nanosecond)
}
}
}