Some previous posters on this thread discussed running in LPARs with
different weights. I wanted to point out that in addition to an
MP-effect at the box level, there is also an MP-effect at the LPAR
level depending on how many CP's are defined to that LPAR. So in the
z9 BC example previously discussed, if you have less CP's defined for
your test you will get more throughput per CPU second, resulting in
less CPU time to do the same work (of course based on other factors
like cache hit already discussed).

Back in 2005 Gerhard Adam demonstrated this internal LPAR effect at
our site by running test jobs on a 2-way and a 23-way LPAR both
running on the same z990.

Net, I believe that the only way you will get consistent results is to
set up a repeatable benchmark on a dedicated machine, or accept the
variance as unavoidable.

Dan

----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html

Reply via email to