K8S控制器压测调参

  选举参数： （适当调大）

flag.DurationVar(&leaseDuration, "lease-duration", 75*time.Second, "")
flag.DurationVar(&renewDeadline, "renew-deadline", 60*time.Second, "")
flag.DurationVar(&retryPeriod, "retry-period", 10*time.Second, "")

与APIServer建连和请求参数（尤其是第一次全量List）：

flag.Float64Var(&clientQPS64, "client-qps", 300, "the qps value for fedcluster")
flag.IntVar(&clientBurst, "client-burst", 600, "the burst value for fedcluster")
flag.IntVar(&concurrency, "concurrency", 20, "Number of FedKService to process simultaneously")

flag.DurationVar(&clientTimeout, "client-timeout", 100*time.Second, "karmada ApiServer request timeout")
flag.DurationVar(&cacheSyncTimeout, "cache-sync-timeout", 10*time.Minute, "the cache sync context timeout")

控制器定时调协参数：（关闭）
flag.DurationVar(&resyncPeriod, "resync_period", 0*time.Second, "karmada Controller re-reconcile period")

代码例子：
mgr, err := ctrl.NewManager(fedClusterRestConfig, ctrl.Options{
    Scheme:                 scheme,

    MetricsBindAddress:     metricsAddr,
    Port:                   webhookPort,
    CertDir:                webhookCertDir,
    HealthProbeBindAddress: probeAddr,
    LeaderElection:         enableLeaderElection,
    LeaderElectionID:       leaderElectionID,
    RetryPeriod:            &retryPeriod,
    RenewDeadline:          &renewDeadline,
    LeaseDuration:          &leaseDuration,
    SyncPeriod:             &resyncPeriod,
})

clientConfig := clientcmd.NewDefaultClientConfig(*kubeconfig, &clientcmd.ConfigOverrides{})
cfg, err = clientConfig.ClientConfig()
if err != nil {
    log.Error(err, "failed to create rest config")
    os.Exit(1)
}

cfg.QPS = clientQPS

cfg.Burst = clientBurst

cfg.Timeout = clientTimeout

if err = (&controllers.XXXReconciler{
    Client:            mgr.GetClient(),
    Logger:            logger,
    Scheme:            mgr.GetScheme(),
    RestConfig:        cfg,
    Recorder:          mgr.GetEventRecorderFor("FedKService"),
}).SetupWithManager(mgr, controller.Options{

    RateLimiter:             utils.ControllerRateLimiter(clientQPS, clientBurst),
    MaxConcurrentReconciles: concurrency,
    CacheSyncTimeout:        cacheSyncTimeout,
})