Chat free no nothing bad online dating experiences


08-Nov-2019 15:18

The naive implementation of sending a notification to all friends whenever a user comes online or goes offline has a worst case cost of O(average friendlist size * peak users * churn rate) messages/second, where churn rate is the frequency with which users come online and go offline, in events/second.

This is wildly inefficient to the point of being untenable, given that the average number of friends per user is measured in the hundreds, and the number of concurrent users during peak site usage is on the order of several millions.

For Facebook Chat, we rolled our own subsystem for logging chat messages (in C ) as well as an epoll-driven web server (in Erlang) that holds online users' conversations in-memory and serves the long-polled HTTP requests.

Both subsystems are clustered and partitioned for reliability and efficient failover. In short, because the problem domain fits Erlang like a glove.

The way this is typically accomplished in a web application is by separating the model and the view: data is persisted in a database (perhaps with a separate in-memory cache), with each short-lived request retrieving only the parts relevant to that request.

Chat free no nothing-45

azdg yu dating sites

The secret for going from zero to seventy million users overnight is to avoid doing it all in one fell swoop.Erlang is a functional concurrency-oriented language with extremely low-weight user-space "processes", share-nothing message-passing semantics, built-in distribution, and a "crash and recover" philosophy proven by two decades of deployment on large soft-realtime production systems.



Our no-work/all-play weekend rages on with Day 2 of the Labor Day Weekend Celebration!… continue reading »


Read more

We've found that milfs are the "one that you want" recently.… continue reading »


Read more

This is an anonymous chat: your identity will not be known and you can feel completely safe.… continue reading »


Read more

Meet and interact LIVE with thousands of free cam girls from around the world. … continue reading »


Read more