Is there a way to control the Numa settings on my iMac?

Is there a way to control the numa settings on the iMac (Core i7), OS X 10.7.3? MacPorts doesn't have numactl and tbb/openmp are both slowing down since the memory is allocated incorrectly.

Solution 1:

Does Lion even support NUMA ?

For Snow-Leopard, I thought, there was no NUMA support. German article as source.

I could not find a source for NUMA support in OS X, thus I would say that there's as well no way to control the NUMA-settings ;)

This Intel document states:

On multi-socket machines based on the Intel® Core™ i7 processor, NUMA is typically available as a BIOS boot option, but effective use also requires some OS and some user-level intervention.

Windows* OS support for NUMA started with Windows* Server 2003, and Linux* OS support requires kernel 2.6 or higher.

No OS X mentioned.

Solution 2:

Why you think you program is slow due to memory allocated incorrectly?

There's always only 1 NUMA node/domain on any iMac, so it is not even a NUMA system; and since it's not a NUMA system there's certainly no control.

For those dual socket Mac Pro, memory are always configured in interleave mode, because the mach kernel is not NUMA aware.