CODEWITHSUNDEEP
clinuxopenmpnuma
tiki
tiki

Reputation: 429

numactl --membind

When using numactl in Linux with the --membind option, let's say I do the following:

numactl --membind=0,1,2 ./prog

Will the memory for ./prog be allocated on all of NUMA nodes 0, 1, and 2? Or will the memory be allocated only on NUMA nodes 1 and 2 if NUMA node 0's memory is not enough? Thanks.

Upvotes: 2

Views: 5603

Answers (1)

Aleš
Aleš

Reputation: 9028

The manpage for numactl says :

--membind=nodes, -m nodes 
  Only allocate memory from nodes. Allocation will fail when there is not enough 
  memory available on these nodes.

So, if node 0 does not have enough memory, the memory will be allocated on the nodes 1,2. The actual ration of memory allocated per each node probably depends on the memory placement policy.

Upvotes: 1

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