[TriLUG] Dual core CPU clarification

[Brian Henning]

IANA threading expert, but I don't think you have anything to lose, 
other than the most nominal of overhead, to go ahead and split into 
several threads.  Properly-configured SMP platforms (I presume) would 
automatically divy the jobs across the cores.  Single-core platforms 
would run all the threads on the one core, and there'd be a performance 
hit, but I think if your threads are well-behaved, I'd be surprised if 
it amounted to even a 1% overhead.

Then again, I really don't know that much about threading.  I could be 
completely wrong.

~Brian

PS: If you want to continue to contact me off-list to test bits of code 
for you, I'll be happy to do so.

Charles Fischer wrote:
> I want to know the number of cores from inside a program.  I am working 
> with some large data sets (16MB digital images), and it would be nice to 
> have a thread per core working on the data.  Being able to determine SMP 
> or NUMA would be nice, but core count is my going to be my first try.
> 
> Thanks
> Charles Fischer
>