How can I know whether my memory is allocated on the node expected?

Hello everyone,

I wanna get more information about my running process and the allocated memory.
When I do the tests for the NUMA API, how can I know
numa_alloc_onnode() does what I expect?
Because I found problems that in my tests sometimes the access to the
i-th node memory by the i-th node processor is slower.

Thank you.

Best regards,
Chen