[Click] How to test adaptive mode with 2 CPUs?

[Eddie Kohler]

Hi Alessandro,

> 1) Does this happen even if we launch click with "click-install 
> --threads 2"
> option? I noticed that if i launch click with --threads 2 option, the 
> system
> monitor signals 100% occupation, while it signals just 50% if i launch
> with "click-install --threads 1" or just "click-install". So I thought 
> this
> was the proof that both the CPUs were being used.... was I wrong?

The real way to find out what's going on is to look at the various 
thread_preference handlers.  Most elements that have tasks will provide 
"/click/ELEMENTNAME/thread_preference" handler, which contains the 
thread ID that the task is running on.  If they're all 0, then 
everything is running on a single thread.

>
> Giorgio Calarco told me that I need to use another element
> called "SortedThreadSched" if i want to run a test in adaptive mode 
> using both
> the 2 CPUs. I cannot find any instruction on it, neither on the 
> documentation
> on click site, nor in the paper
> http://www.pdos.lcs.mit.edu/papers/click:usenix01/usenix01.pdf (but I 
> know it
> has not been written by Kohler).
>
> But I found in the directories of click1.3 an element called 
> "SortedSched". I
> did not find any documentation on it too.

Right, the filename is sortedsched but the element name is 
SortedTaskSched (I was wrong, it's not SortedThreadSched).

>
> 2) Is it the same element ( SortedSched = SortedThreadSched) ?
> 3) Since there is no documentation: how do I have to use it to run the
> adaptive test with both the CPUs?

man SortedTaskSched

Essentially, you just drop in a SortedTaskSched() element.  It has two 
optional parameters which you can leave off.

Eddie