Re: [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
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