Thank Jae, Sebb, David for your response.
Jae/David, I am using only single JMeter instance (no master/slave
style) to run this 10 user test.
Sebb, I agree, I have one text response assertions, which I don't think
should affect transaction response-time. It should calculate the
response-time from the time it has got the response from server and
should not include response assertion duration in the transaction time.
And, delay in transaction submission is expected in this case (causing
tps to bring down).
Sebb, can you please explain how the connection handling is different in
AB & Jmeter? 
Few more details:
No synchronizing of users in JMeter for concurrency (it is simultaneous
user-load scenario). 
Data sent over are of same size in both; in fact it is xml payload for
web-service which is common.

Warm regards, 
Kaushal Kishore

-----Original Message-----
From: sebb [mailto:[EMAIL PROTECTED] 
Sent: Friday, April 04, 2008 5:48 PM
To: JMeter Users List
Subject: Re: Difference in AB and JMeter Results.

On 04/04/2008, Jae Joo <[EMAIL PROTECTED]> wrote:
>
>  Yes, I have same experience. The average time of AB is always faster
than jmeter.
>  AB is very light, but jmeter has it's overhead.

JMeter does have a higher overhead, but that is not the whole picture.
The overheads in JMeter are mainly to do with what happens between
requests.

If I remember correctly, AB handles connections differently.

Also, is AB sending the same amount of data as JMeter?

>  Specially, in client/server environment, it is different a lot.
>
>  If you can, run AB and jmeter in the server - no network traffic
overhead.
>  The difference between jmeter and ab will be shrink down.

The network overhead will be much the same for AB and JMeter, unless
you are using JMeter in client-server mode.

>
>  Jae
>
>
>  -----Original Message-----
>  From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>  Sent: Thu 4/3/2008 10:59 PM
>  To: [email protected]
>  Subject: Difference in AB and JMeter Results.
>
>  Hi,
>
>
>
>  We are getting difference in response time results for same tests
from
>  JMeter and Apache-Benchmark.
>
>  For same 10 users' response-time for single iterations:
>
>  JMeter Response-time: 5000ms
>
>  AB Response-time: 2500ms
>
>
>
>  Please let me know if there is any possibility which is causing
>  response-time delay from JMeter.
>
>
>
>  PS: Both of the tests done from the same environment (client/server
>  environment).
>
>
>
>  Warm regards,
>  Kaushal Kishore
>
>
>

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