diff --git a/packages/hydrooj/src/entry/common.ts b/packages/hydrooj/src/entry/common.ts
index c8b57a987..269f4c027 100644
--- a/packages/hydrooj/src/entry/common.ts
+++ b/packages/hydrooj/src/entry/common.ts
@@ -1,6 +1,7 @@
 /* eslint-disable no-await-in-loop */
 /* eslint-disable no-eval */
 import fs from 'fs';
+import os from 'os';
 import path from 'path';
 import yaml from 'js-yaml';
 import { Logger } from '../logger';
@@ -99,9 +100,15 @@ export async function setting(pending: string[], fail: string[], modelSetting: t
             try {
                 const cfg: any = yaml.load(fs.readFileSync(p).toString());
                 for (const key in cfg) {
+                    let val;
+                    if (typeof cfg[key].default === 'string') {
+                        val = cfg[key].default
+                            .replace(/\$TEMP/g, os.tmpdir())
+                            .replace(/\$HOME/g, os.homedir());
+                    }
                     map[cfg[key].category || 'system'](
                         modelSetting.Setting(
-                            name, `${name}.${key}`, cfg[key].range, cfg[key].default,
+                            name, `${name}.${key}`, cfg[key].range, val,
                             cfg[key].type || 'text', cfg[key].name || key, cfg[key].desc || '',
                         ),
                     );
diff --git a/packages/hydrooj/src/entry/master.ts b/packages/hydrooj/src/entry/master.ts
index 0afb9a8d8..686937bb3 100644
--- a/packages/hydrooj/src/entry/master.ts
+++ b/packages/hydrooj/src/entry/master.ts
@@ -10,7 +10,6 @@ import { Logger } from '../logger';
 import options from '../options';
 import * as bus from '../service/bus';
 import db from '../service/db';
-import storage from '../service/storage';
 
 const logger = new Logger('entry/master');
 const tmpdir = path.resolve(os.tmpdir(), 'hydro');
@@ -64,7 +63,8 @@ export async function load(call: Entry) {
     const sopts = {
         endPoint, accessKey, secretKey, bucket, region, endPointForUser, endPointForJudge,
     };
-    await storage.start(sopts);
+    const storage = require('../service/storage');
+    storage.start(sopts);
     require('../service/monitor');
     for (const i of builtinModel) require(`../model/${i}`);
     const scripts = require('../upgrade');
diff --git a/packages/hydrooj/src/entry/worker.ts b/packages/hydrooj/src/entry/worker.ts
index a69635835..ca43efe28 100644
--- a/packages/hydrooj/src/entry/worker.ts
+++ b/packages/hydrooj/src/entry/worker.ts
@@ -8,7 +8,6 @@ import {
 import options from '../options';
 import * as bus from '../service/bus';
 import db from '../service/db';
-import storage from '../service/storage';
 import { Logger } from '../logger';
 
 const logger = new Logger('loader/worker');
@@ -42,7 +41,8 @@ export async function load() {
     const sopts = {
         endPoint, accessKey, secretKey, bucket, region, endPointForUser, endPointForJudge,
     };
-    await storage.start(sopts);
+    const storage = require('../service/storage');
+    storage.start(sopts);
     if (argv.loaderDetail) logger.info('finish: storage.connect');
     for (const i of builtinLib) require(`../lib/${i}`);
     if (argv.loaderDetail) logger.info('finish: lib.builtin');
@@ -67,9 +67,7 @@ export async function load() {
     if (argv.loaderDetail) logger.info('finish: setting');
     await handler(pending, fail);
     if (argv.loaderDetail) logger.info('finish: handler.extra');
-    for (const i in global.Hydro.handler) {
-        await global.Hydro.handler[i]();
-    }
+    for (const i in global.Hydro.handler) await global.Hydro.handler[i]();
     if (argv.loaderDetail) logger.info('finish: handler.apply');
     const notfound = require('../handler/notfound');
     await notfound.apply();
diff --git a/packages/hydrooj/src/model/system.ts b/packages/hydrooj/src/model/system.ts
index 6872a6ed4..3f5b7d76a 100644
--- a/packages/hydrooj/src/model/system.ts
+++ b/packages/hydrooj/src/model/system.ts
@@ -36,9 +36,10 @@ export function getMany(keys: string[]): any[] {
     return keys.map((key) => cache[key]);
 }
 
-export async function set<K extends keyof SystemKeys>(_id: K, value: SystemKeys[K]): Promise<SystemKeys[K]>
-export async function set<K>(_id: string, value: K): Promise<K>
-export async function set(_id: string, value: any) {
+export async function set<K extends keyof SystemKeys>(_id: K, value: SystemKeys[K], boardcast?: boolean): Promise<SystemKeys[K]>
+export async function set<K>(_id: string, value: K, boardcast?: boolean): Promise<K>
+export async function set(_id: string, value: any, boardcast = true) {
+    if (boardcast) bus.boardcast('system/setting', { [_id]: value });
     const res = await coll.findOneAndUpdate(
         { _id },
         { $set: { value } },
@@ -69,6 +70,10 @@ export async function runConfig() {
     bus.emit('database/config');
 }
 
+bus.on('system/setting', (args) => {
+    for (const key in args) set(key, args[key], false);
+});
+
 global.Hydro.model.system = {
     runConfig,
     get,
diff --git a/packages/hydrooj/src/service/bus.ts b/packages/hydrooj/src/service/bus.ts
index be5ce3494..ce06437c2 100644
--- a/packages/hydrooj/src/service/bus.ts
+++ b/packages/hydrooj/src/service/bus.ts
@@ -118,6 +118,7 @@ export function off<K extends keyof EventMap>(name: K, listener: EventMap[K]) {
 
 export async function parallel<K extends keyof EventMap>(name: K, ...args: Parameters<EventMap[K]>): Promise<void> {
     const tasks: Promise<any>[] = [];
+    if (argv.showBus) logger.debug('parallel: %s %o', name, args);
     for (const callback of _hooks[name] || []) {
         tasks.push(callback.apply(this, args));
     }
@@ -166,7 +167,8 @@ async function messageHandler(worker: cluster.Worker, msg: any) {
                 for (const i in cluster.workers) {
                     cluster.workers[i].send(msg);
                 }
-            } else global.Hydro.service.bus.emit(msg.eventName, ...msg.payload);
+            }
+            emit(msg.eventName, ...msg.payload);
         } else if (msg.event === 'stat') {
             global.Hydro.stat.reqCount += msg.count;
         } else await emit(msg.event, ...msg.payload);