drlchen
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Apache Response Time in Access Log How is it measured
How is "Response Time" in the apache access log measured?
Is it measured by from the time the request was received and sent to the client?
or is it measured from the time the server received the request sent the data back to the client and then receive an ACK from the tcp handshake?
Is it measured by from the time the request was received and sent to the client?
or is it measured from the time the server received the request sent the data back to the client and then receive an ACK from the tcp handshake?
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ASKER
ok after some testing it looks like it includes network time. also
The %T and %D directives refer to the time it takes to handle the entire transaction, including the amount of time it takes for the client to transmit data. If you see wide variances in the amount of time it takes to serve the same file, it may be related to a web client network problem.
Also onlamp.com confirms this
http://onlamp.com/pub/a/apache/2004/04/22/blackbox_logs.html?page=4
The %T and %D directives refer to the time it takes to handle the entire transaction, including the amount of time it takes for the client to transmit data. If you see wide variances in the amount of time it takes to serve the same file, it may be related to a web client network problem.
Also onlamp.com confirms this
http://onlamp.com/pub/a/apache/2004/04/22/blackbox_logs.html?page=4
ASKER
http://stein.cshl.org/~lstein/torture/torture.html
It is the total time to send the request to the server and receive the complete response back. Lower response times are better.
This tells me it also measures the network time but the I found another article suggesting Response Time is the processing time.
Header set X-Request-Processing-Time:
http://prefetch.net/blog/index.php/2007/01/02/measuring-apache-request-processing-time/