A question about scalability...

[aminer]

Hello,


I was reading a paper about FC (flat combining) , and i came accross
some graphs that shows the scalability on the Nehalem architecture:


Here is the paper and the graphs in it:


http://www.cs.tau.ac.il/research/moran.tzafrir/papers/spaa2010_flat_combining.pdf


As you will notice the Nehalem Intel architecture is giving a negative
scalability for all the Queues, but on the SPARC architecture there is
positive scalability.

So my question is:

Why all of the queues are giving a negative scalability on the Intel
Nehalem architecture ?

They are not saying on the paper why all the queues have a negative
scalability .on the Intel Nehalem architecture.. 


My other question: is there someone here who can implement something
like flat combining for a queue and a Skiplist on freepascal ?

thank you.


Amine Moulay Ramdane.