Tomcat - maxThreads vs maxConnections

Question

In Tomcat server xml what is maxThreads versus maxConnections  I understand that maxConnections is the number of connections open to the server  And maxThreads is the maximum number of request processing threads   But how the two configuration parameters working together  obviously you will not set maxConnections to 1000  and maxThreads to 10  What is the relationship between the two configuration parameters       lt Connector      port  8443       protocol  org apache coyote http11 Http11Protocol      maxThreads  250       SSLEnabled  true       scheme  https  secure  true      clientAuth  false       sslProtocol  TLS       connectiontimeout  20000    gt

User · Accepted Answer

Tomcat can work in 2 modes      BIO      blocking I O  one thread per connection  NIO     non-blocking I O  many more connections than threads    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 will be HTTP 1 1 or org apache coyote http11 Http11Protocol  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 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

User · Answer

From Tomcat documentation  For blocking I O  BIO   the default value of maxConnections is the value of maxThreads unless Executor  thread pool  is used in which case  the value of  maxThreads  from Executor will be used instead  For Non-blocking IO  it doesn t seem to be dependent on maxThreads

[java] Tomcat - maxThreads vs maxConnections

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