Result in Jmeter vs Result in Jboss : why is there such a difference?

[Gaël LHEZ <gl...@glowria.fr>]

Hi,

Now that I configured my test, tested them, and installed the whole test
platform, I begin to interest my self to the results. 100 users will connect
to a server, in 200 secons (ramp up)

Here is the configuration, note that all is in local network  (Ethernet,
100MBits/s)


Win2k Terminal + SQLServer
         |
Win2k Terminal + Jboss (jdk1.5_06)
           |
RedHat + Apache 2.0.55

When I run the test, I hit the apache server, which handle what he can, and
let jk_mod handle the rest, then jBoss call the database if needed, etc.

Here a comparaison :  (see below)

Result in red are strange : how could that sample be quicker than the thing
that create the sample? Since the difference is small, I think it simply due
to a redirect (which take less time)

Result in yellow are worse : I can understand that due to network there is
maximum 500ms seconds between the two result, but 2 seconds... 
 
I also had this problems with the same conf, but Apache running on the same
machine than jMeter (on WinXp pro)
 
I'm looking for a good explanation of that? 
 
(currently, I'm thinking that is due to thread issue : one thread is waiting
to get access to CPU's registry, and since System.getTimeMillis() is used to
determine start of time, we have the total lifespan of thread, not it alive
time)


 



	
	Jboss	 Jmeter	 Difference	
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[prospect 1]	 /viewTitleDetails.do?titreId=107902	 0	 31	 31

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[prospect 33]	 /viewNewEditoTitles.do	 47	 78	 31	
[prospect 32]	 /viewTitleDetails.do?titreId=14993	 360	 359	 -1

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2018	
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[prospect 30]	 /viewTopTitles.do	 78	 1111	 1033	
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1330	
[prospect 16]	 /viewTitleDetails.do?titreId=125148	 250	 1485
1235	
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2674	
[prospect 4]	 /viewTitleDetails.do?titreId=114409	 360	 2049
1689