methods to log users in via these sites and, where applicable, methods to authorize access to the service so you can, e.g., download a user’s address book or publish a Twitter message on their behalf. Here argument is passed to listen() you can run the program multiple times to create a multi-process service. 2. add_sockets: multi-process: sockets = bind_sockets(8888) tornado.process.fork_processes(0) more complicated, but it can be used with tornado.process. fork_processes to run a multi-process service with all worker processes forked from a single parent. add_sockets can also be used in single-process

methods to log users in via these sites and, where applicable, methods to authorize access to the service so you can, e.g., download a user’s address book or publish a Twitter message on their behalf. Here argument is passed to listen() you can run the program multiple times to create a multi-process service. 2. add_sockets: multi-process: sockets = bind_sockets(8888) tornado.process.fork_processes(0) more complicated, but it can be used with tornado.process.fork_processes to run a multi-process service with all worker processes forked from a single parent. add_sockets can also be used in single-process

这样所有这些改变都是安全的并符合借用规则。 哈希函数 HashMap 默认使用一种叫做 SipHash 的哈希函数，它可以抵御涉及哈希表（hash table） 的 拒绝服务（Denial of Service, DoS）攻击。然而这并不是可用的最快的算法，不过为了更高的 安全性值得付出一些性能的代价。如果性能监测显示此哈希函数非常慢，以致于你无法接受， 你可以指定一个不同的 hasher 来切换为其它函数。hasher 可以处理任何其他接收到的任务。当第一个线程处理完任务时，它会返回空闲线程池中等待处 理新任务。线程池允许我们并发处理连接，提高服务端的吞吐量。 我们会将池中线程限制为较少的数量，以防拒绝服务（Denial of Service，DoS）攻击；如果 程序为每一个接收的请求都新建一个线程，某人向服务端发起千万级的请求时会耗尽服务器的 资源并导致请求处理陷入停滞。 不同于分配无限的线程，线程池中将有固定数量的等待线程。当新进请求时，将请求发送到线