Monitoring and Tuning Tomcat

[Jerry Malcolm]

I'm trying to optimize my instance, CPU, tuning, and size requirements 
for Tomcat.  It's easy to see CPU usage.  But this TC instance is 
running a lot of microservices that are often in and out fairly 
quickly.  So there can be a huge number of requests coming in.  I'm not 
sure that CPU starving is my biggest concern. I'm more interested is 
getting an understanding of TC front end bottlenecks and also JDBC data 
connection bottlenecks.   So I need a bit of education.   Am I correct 
that maxThreads on the connector throttles the number of requests that 
can come in at one time?  And connectionTimeout is the time to wait to 
get in the door if threads are maxed out before giving up and failing, 
correct?  I'd really like to track total threads in use and then track 
wait time if total threads are maxed out.  Likewise, with database 
connections.  I'd like to monitor the jdbc connection pool as well and 
see when and where the code is having to wait for a db connection and 
how long the average wait is.  I assume there are jms hooks to monitor 
this? But I don't want to reinvent the wheel.  Are there tools out there 
to assist with this already? Thx

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