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From David Kerber <dcker...@verizon.net>
Subject Re: Performance 5.5 vs 6 vs 7
Date Sun, 13 Mar 2011 23:24:12 GMT
On 3/13/2011 5:01 PM, Tony Anecito wrote:
> Hi Don,
>
> As someone mentioned the network can imit you. If your bandwidth utilization is
> at 60% or over you are in trouble since collisions start to become a serious
> issue.
Ah, that's something I had not thought of.  I'm running ~80% network 
utilization at the times when I see the trouble, so that might well be 
the root of the issue.

Thanks!
D


> Also, I have measured around 600microseconds for resonse time when using
> localhost and running the client on the same server as Tomcat but that was still
> going through the network card om by motherboard. I looked ito gettting a faster
> network card but I kept hearing 2ms was the best you could get but I got down to
> 1.2ms running from my laptop to my motherboard so my router (I have a high speed
> gaming router) and network circuitry on my systems is the current limiting
> factor and not Tomcat.
>
> Regards,
> -Tony
>
>
>
> ----- Original Message ----
> From: David Kerber<dckerber@verizon.net>
> To: Tomcat Users List<users@tomcat.apache.org>
> Sent: Sat, March 12, 2011 6:41:30 AM
> Subject: Re: Performance 5.5 vs 6 vs 7
>
> 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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>
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