NUMA memory block size
anton at samba.org
Sat Apr 3 23:43:05 EST 2004
> 1. Why do we use a full int for node ID? It's quite unlikely that we will
> have 2 billion nodes anytime soon. Current limit is 16. :-) Switching to a
> char instead of int might be worth it.
Agreed, we should switch it to an unsigned char.
> 2. A lmb_alloc() approach has the benefit of only allocating as much table
> as we actually have physical memory in the system. At least this way we'd
> only allocate in proportion to how much memory the machine has. 1MB table
> for a 2TB machine isn't too bad. On a 128GB system, size will be the same
> as before (32KB).
This does add another load:
ld 10,.LC1-.LCTOC1(30) /* numa_cpu_lookup_table */
here ->ld 11,0(10) /* *numa_cpu_lookup_table */
But always allocating 128kB (2TB, 16MB segments, char for a node id)
seems excessive so I like your idea of dynamically allocating the
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