CoachUnder first-touch allocation, the default policy of Linux, a page of memory is placed on the NUMA node of the CPU that first writes it (the page fault that creates it), not the one that allocated the address range.
Voorbeelden
Example 4.3 (A book allocated on the wrong node)
The main thread, on node 0, allocates and zeroes 64 MiB of order books with huge pages at start-up, then starts the feed thread on node 1. Every book update now misses to the other socket’s memory. The fix is one line: move the initialisation into the feed thread, after it has pinned itself, or pass the node to the allocator.