[lsb-discuss] LSB-compliant way to get number of processors?

Dallman, John jgd at ugs.com
Thu Aug 3 06:42:12 PDT 2006

I'm starting on adding SMP support to the product I work on. 
It uses threads to improve performance, so there's no point 
in having more of them than there are processors on the 

So I need to find out how many that is. Since this is a
math library, not an application, opening and parsing 
/proc/cpuinfo is utterly unacceptable. I've found two ways 
so far to ask Linux how many processors it has: get_nprocs()
and sysconf(_SC_NPROCESSORS_ONLN), but neither of them seem 
to be allowed in LSB-compliant code. 

What's the right way? 


John Dallman, Parasolid Porting Engineer, +44-1223-371554 

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