On 27/04/17 20:08, John Cartwright - NOAA Federal wrote: > Thanks for your reply Mark! My sysadmin tells me just that we're > using "the defaults" for event_mpm. However we are still using the > BIO AJP connector: > > <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" > maxThreads="300" minSpareThreads="25" > maxSpareThreads="75" connectionTimeout="20000"/> > > Is there a way I can tell from the Tomcat side when there is thread > starvation?
You'd need to look at the number of active connections. If it gets to 300 then you likely have a problem. netstat might be the least invasive way of doing that. Other options include the Manager app, JMX and thread dumps. Switching to NIO will allow you to server more connections with the same number of threads. Mark > > --john > > > On Thu, Apr 27, 2017 at 12:34 PM, Mark Thomas <ma...@apache.org> wrote: >> On 27/04/17 17:47, John Cartwright - NOAA Federal wrote: >>> Hello All, >>> >>> We recently switched to Apache 2.4 and it's event mpm and are now >>> finding that some of our Tomcat 7 webapps are failing sporadically >>> when accessed via Apache - generally reporting 503s back to the >>> browser. The webapps work reliably when accessed directly from >>> Tomcat. >>> >>> We're using mod_jk for the connector - can someone please direct me to >>> resources on tuning Tomcat settings to match those of the Apache event >>> mpm or suggest what I should be tuning? >> >> Might you be using the BIO AJP connector on the Tomcat end? If so, >> switching to the NIO AJP connector should solve most if not all of the >> issues. >> >> (I suspect the problem is thread starvation although I can't find good >> docs on how the mod_jk connection pools work on the httpd end with the >> event worker.) >> >> Mark >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
