Move page cache via mbind to prevent cross-NUMA access

[vishalc-ibm]

page cache pages are retained in memory of the node after running llama-bench bound to a node on multi-node systems, incuring cross-NUMA memory access penalty for subsequent runs of llama-bench bound to a different node. This commit introduces an mbind call as best effort basis to move the pages to the target node where llama-bench is executed, ensuring optimal NUMA locality. Additionally, necessary NUMA headers are included and the build is updated to link against the NUMA library.

Experiments:

1. Run llama-bench on node 1 (base)
2. Run llama-bench on node 0 (regression observed)
3. Run patched llama-bench on node 0 (throughput same as base)

+ /usr/bin/time -p numactl -N 1 -m 1 $llama-bench -m $models/llama-2-7b-chat.Q8_0.gguf -ngl 0 --prio 0 -b 1 -t 24

model	size	params	backend	threads	n_batch	test	t/s
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	pp512	5.39 ± 0.01
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	tg128	5.49 ± 0.03

build: 35782ae (5014)
real 687.60
user 15653.73
sys 42.67

+ /usr/bin/time -p numactl -N 0 -m 0 $llama-bench -m $models/llama-2-7b-chat.Q8_0.gguf -ngl 0 --prio 0 -b 1 -t 24

model	size	params	backend	threads	n_batch	test	t/s
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	pp512	4.60 ± 0.01
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	tg128	4.67 ± 0.03

build: 35782ae (5014)
real 805.99
user 18187.26
sys 48.93

+ /usr/bin/time -p numactl -N 0 -m 0 $patched-llama-bench -m $models/llama-2-7b-chat.Q8_0.gguf -ngl 0 --prio 0 -b 1 -t 24

model	size	params	backend	threads	n_batch	test	t/s
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	pp512	5.35 ± 0.01
llama 7B Q8_0	6.67 GiB	6.74 B	CPU	24	1	tg128	5.46 ± 0.02

build: 35782ae (5014)
real 696.12
user 15735.41
sys 44.08

Suggested-by: Ritesh Harjani (IBM) ritesh.list@gmail.com
Signed-off-by: Vishal Chourasia vishalc@linux.ibm.com