Thanks again!
Am 04.08.2010 15:38, schrieb Christopher Schultz:
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Peter,
On 8/4/2010 3:33 AM, Peter Buning wrote:
Hi Chris,
Am 03.08.2010 22:08, schrieb Christopher Schultz:
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Peter,
On 8/3/2010 10:55 AM, Peter Buning wrote:
we tested our tomcat 5.5 server (Debian system) with the apache
benchmark tool. We send requests for a small png-file (300 bytes).
Nearly all requests were done in 0 or 1 milliseconds. But there were a
few request which needed more than 10 ms and the slowest request needed
106 ms.
Over what period of time? How often do the 106 and/or 10 responses
occur? You may be encountering some simple thing like the OS wanting to
get some of its own work done occasionally.
The slower response times are relative seldom, nearly 0,1 % of the
requests. I think you are right and the OS is working "something" in
this period. I just would like to understand exactly what happens. I
will continue to search for the reasons in this direction.
Try using 'sar' (you may have to install it... I don't think Debian
installs it by default).
the 106 ms is logged in the access log file. We used the %D pattern for
the request time in millis.
It seems not to be a network problem. We can see the same behavior with
a remote and a localhost test. Nevertheless, does anybody know, when
tomact exactly starts and stop the time for logging the request?
The source code for org.apache.catalina.valves.AccessLogValve is
available here:
http://svn.apache.org/repos/asf/tomcat/tc5.5.x/tags/TOMCAT_5_5_30/container/catalina/src/share/org/apache/catalina/valves/AccessLogValve.java
Look at the "invoke" menu.
Of course, I meant "method", not "menu". ;)
- -chris
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