[嵌入式]如何查看鲲鹏ARM上物理core对应在哪一个物理Socket上

我们看到鲲鹏920上有128个物理cores（0-127），2个Socket，4个NUMA，如何知道物理core是落在哪个Socket上？

查看CPU个数，128个物理cores

[root@localhost cpu]# lscpu
Architecture:          aarch64
Byte Order:            Little Endian
CPU(s):                128
On-line CPU(s) list:   0-127
Thread(s) per core:    1
Core(s) per socket:    64
Socket(s):             2
NUMA node(s):          4
Model:                 0
CPU max MHz:           2600.0000
CPU min MHz:           200.0000
BogoMIPS:              200.00
L1d cache:             64K
L1i cache:             64K
L2 cache:              512K
L3 cache:              65536K
NUMA node0 CPU(s):     0-31
NUMA node1 CPU(s):     32-63
NUMA node2 CPU(s):     64-95
NUMA node3 CPU(s):     96-127
Flags:                 fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma dcpop

具体来看物理core属于哪个NUMA，也就是哪个Node。鲲鹏上NUMA=Node

根据信息，NUMA0，1靠的比较近，猜测属于一个Socket

[root@localhost node0]# numactl -H
available: 4 nodes (0-3)
node 0 cpus: 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
node 0 size: 97714 MB
node 0 free: 77724 MB
node 1 cpus: 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
node 1 size: 98201 MB
node 1 free: 93405 MB
node 2 cpus: 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
node 2 size: 98201 MB
node 2 free: 79779 MB
node 3 cpus: 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
node 3 size: 98199 MB
node 3 free: 90048 MB
node distances:
node   0   1   2   3 
  0:  10  12  20  22 
  1:  12  10  22  24 
  2:  20  22  10  12 
  3:  22  24  12  10 

0 1
2 3
看后四行 核心数对应就行

查看numastat

[root@localhost node0]# numastat 
                           node0           node1           node2           node3
numa_hit               397893104        15671778         4599060        27556406
numa_miss                      0               0               0               0
numa_foreign                   0               0               0               0
interleave_hit              1574            1642            1569            1695
local_node             397892269        15668947         4596482        27553048
other_node                   835            2831            2578            3358

一台整机有4个Node，查看node0上有哪些物理core，能够看到0-31

[root@localhost cpu]# cd cpu0/
[root@localhost cpu0]# cd node0/
[root@localhost node0]# ls
compact  cpu10  cpu13  cpu16  cpu19  cpu21  cpu24  cpu27  cpu3   cpu4  cpu7  cpulist   hugepages  power      vmstat
cpu0     cpu11  cpu14  cpu17  cpu2   cpu22  cpu25  cpu28  cpu30  cpu5  cpu8  cpumap    meminfo    subsystem
cpu1     cpu12  cpu15  cpu18  cpu20  cpu23  cpu26  cpu29  cpu31  cpu6  cpu9  distance  numastat   uevent

查看整机上有哪些物理core

[root@localhost cpu]# pwd
/sys/devices/system/cpu

[root@localhost cpu]# ls
cpu0    cpu108  cpu118  cpu13  cpu23  cpu33  cpu43  cpu53  cpu63  cpu73  cpu83  cpu93     kernel_max
cpu1    cpu109  cpu119  cpu14  cpu24  cpu34  cpu44  cpu54  cpu64  cpu74  cpu84  cpu94     modalias
cpu10   cpu11   cpu12   cpu15  cpu25  cpu35  cpu45  cpu55  cpu65  cpu75  cpu85  cpu95     nohz_full
cpu100  cpu110  cpu120  cpu16  cpu26  cpu36  cpu46  cpu56  cpu66  cpu76  cpu86  cpu96     offline
cpu101  cpu111  cpu121  cpu17  cpu27  cpu37  cpu47  cpu57  cpu67  cpu77  cpu87  cpu97     online
cpu102  cpu112  cpu122  cpu18  cpu28  cpu38  cpu48  cpu58  cpu68  cpu78  cpu88  cpu98     possible
cpu103  cpu113  cpu123  cpu19  cpu29  cpu39  cpu49  cpu59  cpu69  cpu79  cpu89  cpu99     power
cpu104  cpu114  cpu124  cpu2   cpu3   cpu4   cpu5   cpu6   cpu7   cpu8   cpu9   cpufreq   present
cpu105  cpu115  cpu125  cpu20  cpu30  cpu40  cpu50  cpu60  cpu70  cpu80  cpu90  cpuidle   uevent
cpu106  cpu116  cpu126  cpu21  cpu31  cpu41  cpu51  cpu61  cpu71  cpu81  cpu91  hotplug   vulnerabilities
cpu107  cpu117  cpu127  cpu22  cpu32  cpu42  cpu52  cpu62  cpu72  cpu82  cpu92  isolated