Tony Anecito wrote:
Actually I just saw some reports on the new quad intel
45nm processors and they are much faster than 15msec.
To justify new hardware and predict scalability
Capacity Planning groups have to show the before/after
performance.
I have seen web apps operate in the 4msec range on
comercial servlet containers.
I am trying to show a fortune 50 company that Tomcat
is fast and a viable replacement that can scale. But
the commercial product does have microsecond
resolution in its logs.
I have measured the System.currentTimeNanos() and
found it to be down below 1usec execute time so not
sure what you are thinking.
http://www.simongbrown.com/blog/2007/08/20/millisecond_accuracy_in_java.html
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6440250
The biggest thing, that seems to be unclearly documented, is what
System.nanoTime returns and what that value means.
Since that becomes OS/CPU dependent, you must understand the underlying
value.
You can of course put in any timers you want in Tomcat, just plug in a
valve or another component that does the measurement for you.
Filip
Hope that helps.
-Tony
--- Filip Hanik - Dev Lists <[EMAIL PROTECTED]>
wrote:
Tony Anecito wrote:
Hi All,
I am using Tomcat 6.0.14 with java 1.6.0_02 on
Windows
2000 professional.
I am wondering what is the best parser to use for
this
configuration? The one with java 1.6.0_02?
for XML?
the Sun JRE implements the Xerces and Xalan parsers,
so it would be the
same as if you used those.
Also, what is the best way to monitor performance?
I
am using the logs and they are only 15msec
resolution.
I am surprised the Tomcat design uses timers with
that
resolution even when microsecond resoltion is
advertised. Why not use the nanosecond timers that
were added with jvm 1.5+ ? Please add resolution
to
6.0.15.
From what I understand
System.currentTimeMillis() - fast
System.currentTimeNanos() - not as fast, and we
don't need that granularity
Regards,
-Tony
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