We are using Apache and tomcat with mod_jk connector.
I want to calculate amount of time taken for the request at Apache side (for both request and response cycle)
means time to forward req to tomcat and get response back and send back to client through apache.
If you're looking to determine how much of the response time is consumed by the apache connector, you're probably optimizing in the wrong place. On a typical system, where the Tomcat and apache servers are both on the same machine, the communication is done via in-memory tcp/ip and the whole process can be expected to take no more than a few milliseconds, unless you're moving really horrendous amounts of data. If the two servers are on different machines, the network overhead will raise that number, but as long as the network itself is in good shape, still not much time. The connector doesn't do a lot of intensive computing - it's basically just relaying.
Typically, a much larger component of the response time is going to come from the time spent in the backend processing (after Tomcat has received it) and on the network leading into the apache server.
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I have some other modules in Apache which will be executed like input and output filters for before and after tomcat processing.
So, I wanted to calculate time taken at apache front not only with the mod_jk but including.