How to increase number of threads in tomcat thread pool

Question

i just want to know How to increase number of threads in tomcat thread pool   and what number to set the max too  i don t know what s appropriate

User · Accepted Answer

Sounds like you should stay with the defaults ;-)

Seriously: The number of maximum parallel connections you should set depends on your expected tomcat usage and also on the number of cores on your server. More cores on your processor => more parallel threads that can be executed.

See here how to configure...

Tomcat 9: https://tomcat.apache.org/tomcat-9.0-doc/config/executor.html

Tomcat 8: https://tomcat.apache.org/tomcat-8.0-doc/config/executor.html

Tomcat 7: https://tomcat.apache.org/tomcat-7.0-doc/config/executor.html

Tomcat 6: https://tomcat.apache.org/tomcat-6.0-doc/config/executor.html

User · Answer

You would have to tune it according to your environment   Sometimes it s more useful to increase the size of the backlog  acceptCount  instead of the maximum number of threads   Say  instead of   lt Connector     maxThreads  500  acceptCount  50    you use   lt Connector     maxThreads  300  acceptCount  150    you can get much better performance in some cases  cause there would be less threads disputing the resources and the backlog queue would be consumed faster   In any case  though  you have to do some benchmarks to really know what is best

User · Answer

From Tomcat Documentation   maxConnections When this number has been reached  the server will accept  but not process  one further connection   once the limit has been reached  the operating system may still accept connections based on the acceptCount setting   The maximum queue length for incoming connection requests when all possible request processing threads are in use  Any requests received when the queue is full will be refused  The default value is 100    For BIO the default is the value of maxThreads unless an Executor is used in which case the default will be the value of maxThreads from the executor  For NIO and NIO2 the default is 10000  For APR native  the default is 8192  Note that for APR native on Windows  the configured value will be reduced to the highest multiple of 1024 that is less than or equal to maxConnections  This is done for performance reasons   maxThreads The maximum number of request processing threads to be created by this Connector  which therefore determines the maximum number of simultaneous requests that can be handled  If not specified  this attribute is set to 200  If an executor is associated with this connector  this attribute is ignored as the connector will execute tasks using the executor rather than an internal thread pool

[tomcat7] How to increase number of threads in tomcat thread pool?

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