Tomcat - maxThreads vs maxConnections [英] Tomcat - maxThreads vs maxConnections

问题描述

在Tomcat server.xml中什么是maxThreads与maxConnections

In Tomcat server.xml what is maxThreads versus maxConnections

我知道maxConnections是打开服务器的连接数

I understand that maxConnections is the amount of connections open to the server

而maxThreads是请求处理线程的最大数量

And maxThreads is the maximum number of request processing threads

但是两个配置参数如何协同工作，显然你不会将maxConnections设置为1000和maxThreads到10

But how the two configuration parameters working together, obviously you will not set maxConnections to 1000 and maxThreads to 10

两个配置参数之间有什么关系？

What is the relationship between the two configuration parameters?

<Connector 
    port="8443" 
    protocol="org.apache.coyote.http11.Http11Protocol"
    maxThreads="250" 
    SSLEnabled="true" 
    scheme="https" secure="true"
    clientAuth="false" 
    sslProtocol="TLS" 
    connectiontimeout="20000"
/>

推荐答案

Tomcat可以在两种模式下工作：

Tomcat can work in 2 modes:

• BIO - 阻止I / O（每个连接一个线程）


• NIO - 非阻塞I / O （比线程更多的连接）

• BIO – blocking I/O (one thread per connection)
• NIO – non-blocking I/O (many more connections than threads)

Tomcat 7 是 BIO默认情况下，虽然共识似乎是不要使用Bio，因为Nio在各方面都更好。您可以使用 协议 server.xml 文件中的$ c>参数。

Tomcat 7 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将 HTTP / 1.1 或 org.apache.coyote.http11.Http11Protocol


• NIO将 org.apache.coyote.http11.Http11NioProtocol

• BIO will be HTTP/1.1 or org.apache.coyote.http11.Http11Protocol
• NIO will be org.apache.coyote.http11.Http11NioProtocol

如果您正在使用BIO，那么我相信它们应该或多或少相同。

If you're using BIO then I believe they should be more or less the same.

如果您正在使用NIO，那么实际上maxConnections = 1000和maxThreads = 10甚至可能是合理的。默认值为maxConnections = 10,000，maxThreads = 200。使用NIO，每个线程可以提供任意数量的连接，来回切换但保留连接，因此您不需要进行所有通常的握手，这对于HTTPS来说尤其耗时，但即使是HTTP问题也是如此。您可以调整keepAlive参数以保持连接的时间更长，这样可以加速所有事情。

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 serve 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.

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