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.
111 lines
2.3 KiB
Go
111 lines
2.3 KiB
Go
// Copyright (C) 2014 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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"context"
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"crypto/tls"
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"errors"
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"flag"
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"fmt"
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"net/url"
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"os"
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"time"
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"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/discover"
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"github.com/syncthing/syncthing/lib/events"
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"github.com/syncthing/syncthing/lib/protocol"
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_ "go.uber.org/automaxprocs"
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)
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var timeout = 5 * time.Second
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func main() {
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var server string
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flag.StringVar(&server, "server", "", "Announce server (blank for default set)")
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flag.DurationVar(&timeout, "timeout", timeout, "Query timeout")
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flag.Usage = usage
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flag.Parse()
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if flag.NArg() != 1 {
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flag.Usage()
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os.Exit(64)
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}
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id, err := protocol.DeviceIDFromString(flag.Args()[0])
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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if server != "" {
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checkServers(id, server)
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} else {
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checkServers(id, config.DefaultDiscoveryServers...)
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}
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}
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type checkResult struct {
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server string
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addresses []string
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error
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}
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func checkServers(deviceID protocol.DeviceID, servers ...string) {
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t0 := time.Now()
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resc := make(chan checkResult)
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for _, srv := range servers {
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srv := srv
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go func() {
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res := checkServer(deviceID, srv)
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res.server = srv
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resc <- res
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}()
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}
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for range servers {
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res := <-resc
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u, _ := url.Parse(res.server)
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fmt.Printf("%s (%v):\n", u.Host, time.Since(t0))
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if res.error != nil {
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fmt.Println(" " + res.error.Error())
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}
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for _, addr := range res.addresses {
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fmt.Println(" address:", addr)
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}
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}
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}
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func checkServer(deviceID protocol.DeviceID, server string) checkResult {
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disco, err := discover.NewGlobal(server, tls.Certificate{}, nil, events.NoopLogger, nil)
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if err != nil {
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return checkResult{error: err}
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}
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res := make(chan checkResult, 1)
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time.AfterFunc(timeout, func() {
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res <- checkResult{error: errors.New("timeout")}
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})
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go func() {
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addresses, err := disco.Lookup(context.Background(), deviceID)
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res <- checkResult{addresses: addresses, error: err}
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}()
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return <-res
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}
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func usage() {
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fmt.Printf("Usage:\n\t%s [options] <device ID>\n\nOptions:\n", os.Args[0])
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flag.PrintDefaults()
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}
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