我的 node.js 围绕 foreach 循环处理大量数据，在 mongo 中进行读写。它需要 100% 的 CPU 利用率和大约 1 GB 的内存。有什么建议可以改进吗？
请帮忙谢谢。
代码：
worker.process('bell', (job, done) => {
Logger.info('Processing job of type ' + job.type + ' id ' + job.id);
let data = job.data;
Logger.info(JSON.stringify(data));
let status;
if (data.users && Array.isArray(data.users)) {
if (data.users.length <= 0) {
Logger.error(new Error('No User List is provided For Notification: '));
done(new Error('No User List is provided For Notification: '));
}
status = 'active';
NotificationService.findById(data.notifications._id) // change state of notification
.then((doc) => {
doc.states = status;
doc.modified_at = new Date().getTime();
doc.save();
}).catch(Logger.error);
data.users.forEach((user) => {
UserService.findOne({
id: user
}).then((doc) => {
if (doc && !doc.bell_notifications.includes(data.notifications._id)) {
doc.badge++;
if (doc.bell_notifications.length == 20) {
doc.bell_notifications.pop();
console.log('checking pop');
}
doc.bell_notifications.unshift(data.notifications._id);
// Logger.info('Sending Notification to ' + user);
console.log('Sending notification to ', user);
io.io.to(user).emit('newNotificationCount', doc.badge);
doc.save();
}else{
// Logger.info(new Error("User Not found : " + user));
}
}).catch(console.error)
});
done();
status = 'success';
} else {
status = 'failed';
done(new Error('notification data is not present in chrome job'))
}
NotificationService.findById(data.notifications._id) // change state of notification
.then((doc) => {
doc.states = status;
doc.modified_at = new Date().getTime();
doc.save();
}).catch(err => Logger.error(new Error(err)))
});