Thomas
aa559bf496
Go is not cgroup aware and by default will set GOMAXPROCS to the number of available threads, regardless of whether it is within the allocated quota. This behaviour causes high amount of CPU throttling and degraded application performance.
99 lines
1.8 KiB
Go
99 lines
1.8 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package main
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"time"
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"github.com/syncthing/syncthing/lib/sha256"
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_ "go.uber.org/automaxprocs"
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)
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func main() {
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period := flag.Duration("period", 200*time.Millisecond, "Sleep period between checks")
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flag.Parse()
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file := flag.Arg(0)
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if file == "" {
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fmt.Println("Expects a path as an argument")
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return
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}
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exists := true
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size := int64(0)
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mtime := time.Time{}
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var hash [sha256.Size]byte
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for {
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time.Sleep(*period)
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newExists := true
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fi, err := os.Stat(file)
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if err != nil && os.IsNotExist(err) {
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newExists = false
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} else if err != nil {
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fmt.Println("stat:", err)
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return
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}
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if newExists != exists {
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exists = newExists
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if !newExists {
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fmt.Println(file, "does not exist")
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} else {
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fmt.Println(file, "appeared")
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}
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}
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if !exists {
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size = 0
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mtime = time.Time{}
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hash = [sha256.Size]byte{}
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continue
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}
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if fi.IsDir() {
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fmt.Println(file, "is directory")
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return
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}
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newSize := fi.Size()
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newMtime := fi.ModTime()
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newHash, err := sha256file(file)
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if err != nil {
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fmt.Println("sha256file:", err)
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}
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if newSize != size || newMtime != mtime || newHash != hash {
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fmt.Println(file, "Size:", newSize, "Mtime:", newMtime, "Hash:", fmt.Sprintf("%x", newHash))
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hash = newHash
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size = newSize
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mtime = newMtime
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}
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}
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}
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func sha256file(fname string) (hash [sha256.Size]byte, err error) {
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f, err := os.Open(fname)
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if err != nil {
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return
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}
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defer f.Close()
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h := sha256.New()
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io.Copy(h, f)
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hb := h.Sum(nil)
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copy(hash[:], hb)
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return
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}
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