官方的介绍：
http://www.celeryproject.org/
Celery is an asynchronous task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well.
The execution units, called tasks, are executed concurrently on a single or more worker servers using multiprocessing, Eventlet, or gevent. Tasks can execute asynchronously (in the background) or synchronously (wait until ready).
Celery is used in production systems to process millions of tasks a day.
Celery 是 异步任务队列/基于分布式消息传递的作业队列。它侧重于实时操作，但对调度支持也很好。celery用于生产系统每天处理数以百万计的任务。
值得关注的是，将Celery 与RabbitMQ 结合，将会产出很好的效果，可以实现 类似 新浪微博大数据量的消息推送。 有一篇文章使用 django+celery+RabbitMQ 来实现异步大数据的数据推送。有兴趣的人可以看看~~ http://simple-is-better.com/news/466
