On 08/25/2014 08:25 PM, Rainer Jung wrote:
[...]
Out of curiosity, on the summary page generated by mod_status, the
description of W is:
"*|W|*" Sending Reply
I thought that when in this state, the corresponding thread / proccess
was sending the reply to the client. From your reply if i understood
correctly seems that when using mod_proxy (and mod_jk right?) the W
state includes the time spent on sending the request and geting a reply
from the origin.
Is this right?
Yes, "W" is everything between having read the request and logging the
request after having send the response. So especially it includes
forwarding in proxy or mod_jk and waiting/reading the response from
the origin server.
You should add response duration logging to the httpd server access
log (%D) and to the origin server log file, if you want to track the
performance of the latter. mod_jk allows you to additionally log
origin server response times as observed by the httpd web server in
the httpd access log.
Indeed is one of the first things that i do (enable %D) when configuring
httpd / tomcat etc.
I asked because i expected that when a lot of apache workers are in the
"W" state it was dueto slow clients or DOS attacks.
Regards,
Thanks for your reply,
Frederik
Rainer
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