All,
There has been a few conversations and some nice work lately on adding
nanosecond resolution to response-time measurements.
I wonder about what is being measured, though.
When a request is made, the TCP connection experiences several different
phases:
1. Sitting in the OS's accept queue
2. Sitting in Tomcat's accept queue (this is after accept() returns and
the request is added to our internal work-queue, but before a
request-processing thread begins processing the request)
3. Being actively processed by a Tomcat service thread
I'm fairly sure that we are only actually measuring #3 when reporting
response-time in access logs.
Would it be possible to add #2 as well?
I think it's impossible to add #1 because all of that happens before
Java even gets a look at the request.
This may be more of a question of perception than anything else... while
we /can/ measure response-time in ns, now... perhaps we are lying to
ourselves about the actual experience of the client.
-chris
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