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SubjectRe: hackbench regression due to commit 9dfc6e68bfe6e
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Le jeudi 08 avril 2010 à 07:39 +0200, Eric Dumazet a écrit :
> I suspect NUMA is completely out of order on current kernel, or my
> Nehalem machine NUMA support is a joke
>
> # numactl --hardware
> available: 2 nodes (0-1)
> node 0 size: 3071 MB
> node 0 free: 2637 MB
> node 1 size: 3062 MB
> node 1 free: 2909 MB
>
>
> # cat try.sh
> hackbench 50 process 5000
> numactl --cpubind=0 --membind=0 hackbench 25 process 5000 >RES0 &
> numactl --cpubind=1 --membind=1 hackbench 25 process 5000 >RES1 &
> wait
> echo node0 results
> cat RES0
> echo node1 results
> cat RES1
>
> numactl --cpubind=0 --membind=1 hackbench 25 process 5000 >RES0_1 &
> numactl --cpubind=1 --membind=0 hackbench 25 process 5000 >RES1_0 &
> wait
> echo node0 on mem1 results
> cat RES0_1
> echo node1 on mem0 results
> cat RES1_0
>
> # ./try.sh
> Running with 50*40 (== 2000) tasks.
> Time: 16.865
> node0 results
> Running with 25*40 (== 1000) tasks.
> Time: 16.767
> node1 results
> Running with 25*40 (== 1000) tasks.
> Time: 16.564
> node0 on mem1 results
> Running with 25*40 (== 1000) tasks.
> Time: 16.814
> node1 on mem0 results
> Running with 25*40 (== 1000) tasks.
> Time: 16.896

If run individually, the tests results are more what we would expect
(slow), but if machine runs the two set of process concurrently, each
group runs much faster...


# numactl --cpubind=0 --membind=1 hackbench 25 process 5000
Running with 25*40 (== 1000) tasks.
Time: 21.810

# numactl --cpubind=1 --membind=0 hackbench 25 process 5000
Running with 25*40 (== 1000) tasks.
Time: 20.679

# numactl --cpubind=0 --membind=1 hackbench 25 process 5000 >RES0_1 &
[1] 9177
# numactl --cpubind=1 --membind=0 hackbench 25 process 5000 >RES1_0 &
[2] 9196
# wait
[1]- Done numactl --cpubind=0 --membind=1 hackbench
25 process 5000 >RES0_1
[2]+ Done numactl --cpubind=1 --membind=0 hackbench
25 process 5000 >RES1_0
# echo node0 on mem1 results
node0 on mem1 results
# cat RES0_1
Running with 25*40 (== 1000) tasks.
Time: 13.818
# echo node1 on mem0 results
node1 on mem0 results
# cat RES1_0
Running with 25*40 (== 1000) tasks.
Time: 11.633

Oh well...


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