RE: [Grinder-use] Logfile Data (Technical Meaning)

[Fitzgerald, C. <Cal...@Th...>]

The reason that the "Time to establish connection" and "time to resolve
host" metrics are not subtracted from the total is that each metric is
measured from the start time of the test. The metrics are not reported as
incremental measurements. Ie:

"time to resolve host" = DNSLookup

"Time to establish connection" = DNSLookup + TCP Connection

"Time to First Byte" = DNSLookup + TCP Connection + First Byte Received

"Total Time" = DNSLookup + TCP Connection + First Byte Received + Data
Transmission

Therefore the only thing that you need to subtract from the "Total Time" to
get your Data Transmission time is "Time to First Byte".

Cheers
Calum


-----Original Message-----
From: joh...@st...
[mailto:joh...@st...] 
Sent: Wednesday April 2006 16:19
To: Fitzgerald, Calum
Subject: RE: [Grinder-use] Logfile Data (Technical Meaning)

Your formular makes sense, but what why is the " Time to establish
connection" and "time to resolve host" not substracted from the total test
time?
During that time durations there is not transmission of data.


Does it really not make sense to substract this time durations if I look at
each Teststep on it's one.

Eg. The "bytes per second" for a Teststep would than be: 
"Bytes transfered in Teststep" / "Time for the Teststep" - "time to resolve
host" - " Time to establish connection" ???- "time to first byte" ???

Regards,
 jo
---------- Original Message ----------------------------------
From: "Fitzgerald, Calum" <Cal...@Th...>
Date:  Tue, 25 Apr 2006 15:57:03 +0100

> 
>Your formula needs to be:
>
>formular: Total Response Length / ( Total Test Time - Total Time to 
>first Byte )
>
>This would give you an average for "Response bytes per second" for the 
>whole test run.
>
>The time to first byte metric gives you  a measurement of when the 
>serverside application has finished process your request and starts to 
>send you its response.
>
>The metrics for Time to Resolve host, Time to establish connection and 
>Time to first byte are all measured from the start of the "TestStep", 
>they are not incremental.
>
>Cheers
>Calum
>
>
>-----Original Message-----
>From: joh...@st...
>[mailto:joh...@st...]
>Sent: Tuesday April 2006 15:29
>To: gri...@li...
>Subject: RE: [Grinder-use] Logfile Data (Technical Meaning)
>
>Does this calculation make sense of "Response bytes per second", when 
>we run this test case as a single virtual user (only one user is 
>running and
>measuering)
>
>Eg this log is beeing printed:
>
>"TestSteps"   TestStep time  response length   Time to resolve host   Time
>to establish connection	  Time to first byte    TestDesc
>1              621	   	   2450	           100
>421	               611              "GET glbl_ie6.css"
>2              80	           1029	           0
>0	                       80               "GET portal_body_bg_img.gif"
>3              101	           329	           0
>0	                       101              "GET basic.js"
>
>Total          802                 3808            100
>421
>
>
>formular: Total Response Length / ( Total Test Time - Total Time to 
>resolve host - Total Time to establish connection )
>
>= (2450 + 1029 + 329) / ((621+80+101) - (100 + 0 + 0) - (421 - 0 -0 )) 
>=
>3808 / 281 = 13,81 Response Bytes per second
>
>Would it be possible to measure accurately the throughput with the 
>httpClient Plugin?
>
>Currently (only for one running VU) I see one recorded script as one test.
>And one line as a test step, or as a nested Tests for later analysis.
>
>
>
> 
>
>
> 
>                   
>
>
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