Hi,
it seems that my system (4-socket system) is
interleaving pages across all numa nodes.
The default should be local allocation?
I tried this out using the stream benchmark and pinned
the single thread to a single cpu with taskset.
numa_balancing is disabled.
Can I configure the default memory policy or is there
something wrong?
Configuration:
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-linux
root=UUID=294db3db-d278-4b20-9199-f5ac6926efaf rw console=tty0
console=ttyS0,115200 numa_balancing=disable nomodeset quiet
$ uname -a
Linux inwest 3.12.6-1-ARCH #1 SMP PREEMPT Fri Dec 20 19:39:00 CET 2013
x86_64 GNU/Linux
Here is how i produced the output:
wget www.cs.virginia.edu/stream/FTP/Code/stream.c
gcc -mcmodel=medium -O -DSTREAM_ARRAY_SIZE=100000000 stream.c -o stream.100M
taskset -c 0 ./stream.100M 1> /dev/null & watch -n 1 numastat -cp $!
Per-node process memory usage (in MBs) for PID 2055 (stream.100M)
Node 0 Node 1 Node 2 Node 3 Total
------ ------ ------ ------ -----
Huge 0 0 0 0 0
Heap 576 576 569 568 2289
Stack 0 0 0 0 0
Private 0 0 0 0 0
------- ------ ------ ------ ------ -----
Total 576 576 569 568 2289
numactl -l taskset -c 0 ./stream.100M 1> /dev/null & watch -n 1 numastat -cp $!
Per-node process memory usage (in MBs) for PID 2333 (stream.100M)
Node 0 Node 1 Node 2 Node 3 Total
------ ------ ------ ------ -----
Huge 0 0 0 0 0
Heap 576 573 568 572 2289
Stack 0 0 0 0 0
Private 0 0 0 0 0
------- ------ ------ ------ ------ -----
Total 576 573 568 572 2289
numactl -m 0 taskset -c 0 ./stream.100M 1> /dev/null & watch -n 1
numastat -cp $!
Per-node process memory usage (in MBs) for PID 2394 (stream.100M)
Node 0 Node 1 Node 2 Node 3 Total
------ ------ ------ ------ -----
Huge 0 0 0 0 0
Heap 2289 0 0 0 2289
Stack 0 0 0 0 0
Private 0 0 0 0 0
------- ------ ------ ------ ------ -----
Total 2289 0 0 0 2289
---
$ numactl -s 0 taskset -c 0 ./stream.100M
policy: default
preferred node: current
physcpubind: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
68 69 70 71 72 73 74 75 76 77 78 79
cpubind: 0 1 2 3
nodebind: 0 1 2 3
membind: 0 1 2 3
Thanks,
Andreas
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