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From David Kerber <dcker...@verizon.net>
Subject Re: Performance 5.5 vs 6 vs 7
Date Sat, 12 Mar 2011 13:41:30 GMT
I've thought about that, but I would think I would be maxing out the cpu 
if tomcat's processing were the limit.  I'm running only about 8% cpu 
usage across all 4 cpu's.


On 3/11/2011 4:23 PM, Tony Anecito wrote:
> Hi David,
>
> I recently ran performance tests against version 7 and during that whole process
> discovered at best for a single instance of Tomcat 7 running on a 6 core AMD
> 2.8Ghz processor the best I could get running the client on the server and using
> loopback network (Localhost) was around 32K per second hitting a servlet that
> had no code. I was using APR also. By adding the network domain name where it
> forced the requests to go through my gaming router I could only get 2.2K
> requests per second. If I ran the client from a laptop on the lan I got around
> the same number.
>
> I have not looked into adding another instance of Tomcat but I suspect as you
> add latency and some form of code in a servlet it might get down to 100 requests
> per second. Remember if a single request takes 10msec at Tomcat and depending
> upon the amount of data and latency (say 100msec) you are already down to 100
> req per second at best. You might only get that at best.
>
> Regards,
> -Tony
>
>
>
> ----- Original Message ----
> From: David kerber<dckerber@verizon.net>
> To: Tomcat Users List<users@tomcat.apache.org>
> Sent: Fri, March 11, 2011 1:02:12 PM
> Subject: Performance 5.5 vs 6 vs 7
>
> How might I expect the performance of 7 to compare to a late rev of 5.5 or
> 6.0.x, running under JRE 6?  Specifically, my application has lots of small,
> simple requests, and the app does nothing but de-obfuscate (it's not really
> sophisticated enough to call it encryption) the data and save it to disk.  But
> it does a LOT of them, 60 to 100 per second during normal operation, more during
> very busy times.  The overall average when I checked last week was about 60
> requests per second for the previous 10 days, around the clock,>4.5M per day.
>
> I spent quite a bit of effort in optimizing my app last year, and got some big
> gains in it, but now I'm again starting to not be able to keep up with the
> increased flow as our customer has doubled their number of installations, so I'm
> looking elsewhere for potential improvements. I've already checked my connection
> bandwidth, and that still has some headroom, though not a lot.  Can I expect TC
> 6 or 7 to handle larger numbers of very simple requests than 5.5 can?
>
> Dave
>
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>
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