tomcat maxThreads 和 maxConnections 配置

（1）from：https://stackoverflow.com/questions/24678661/tomcat-maxthreads-vs-maxconnections

Tomcat can work in 2 modes:

BIO (one thread per connection), or NIO (many more connections than threads).

Tomcat7 is BIO by default, although consensus seems to be "don't use Bio because Nio is better in every way". You set this using the "protocol" parameter in the server.xml file - BIO will be "HTTP1.1" or "org.apache.coyote.http11.Http11Protocol" and NIO will be "org.apache.coyote.http11.Http11NioProtocol"

If you're using BIO then I believe they should be more or less the same. If you're using NIO then actually "maxConnections=1000" and "maxThreads=10" might even be reasonable. The defaults are maxConnections=10,000 and maxThreads=200. With NIO, each thread can server any number of connections, switching back and forth but retaining the connection so you don't need to do all the usual handshaking which is especially time-consuming with HTTPS but even an issue with HTTP. You can adjust the "keepAlive" parameter to keep connections around for longer and this should speed everything up.