How to obtain cache line size on commercial UNIX OSes from a C/C++ program?

It is easy enough to find the 开发者_开发知识库answer for Windows, Linux and OSX on the web, but how about on commercial UNIX operating systems like AIX (on POWER), HP-UX (on Itanium) and Solaris (on SPARC). Experimenting with false cache line sharing code is not the answer I'm looking for.

Edit: Added the CPU architectures.

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If you're trying to optimize performance, then benchmarking is exactly what you should do. For an example, see ATLAS.

If you're not trying to optimize performance, why do you care about the cache line size, and do you also care about the number of lines and the associativity?

What CPU architectures do you need to support?

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For Solaris (on both SPARC and x86 architectures) you can use that command:

$ prtpicl -v -c cpu | grep -i cache-line-size
  :l1-dcache-line-size   0x40 
  :l1-icache-line-size   0x40 
  :l2-cache-line-size    0x40 

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You can have a look at the hwloc library (BSD license) which gives this kind of information for different systems and architectures. You can either use the command line tool lstopo or the provided API (see documentation).