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Re: Is load testing a web service with seperate threads from one machine the same as a single thread from seperate machines?

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Esmond Pitt wrote:
> ses wrote:
>> Out of interest would it be any different if I used a server with a
>> number of virtual machines? (Not that I really have that level of
>> resources available to me!)

> *Everything* that represents a difference between the testing environment and
> the deployment environment is significant. In this case you would testing the
> server with 1/N less CPU power than would be available if there were N
> physical rather than virtual servers. Prety significant, don't you think?

Real-world anecdote:  I was on a big-iron project a few years ago where the 
test environment and production environment servers were two different models, 
with differing core counts, of the same mainframe server brand in the same 
line (the test environment's was the little brother of the production server), 
and that made it impossible for the test environment to replicate certain 
conditions that happened in production.

There are formal means to project probabilistically from test results in such 
situations, but in practice those who know how to do so rarely get the 
authority to design the test plans.

Then again, such people are rare.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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Re: Is load testing a web service with seperate threads from one machine the same as a single thread from seperate machines? Lew <noone@lewscanon.com> - 2011-03-29 11:36 -0400

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