Number of physical core detected by tiflash compute node(Disagg Mode) is not accurate

[guo-shaoge]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

Actual cpu info: 8 cores

Architecture:                    aarch64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
CPU(s):                          8
On-line CPU(s) list:             0-7
Thread(s) per core:              1
Core(s) per socket:              8
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       ARM
Model:                           1
Model name:                      Neoverse-N1
Stepping:                        r3p1
BogoMIPS:                        243.75
L1d cache:                       512 KiB
L1i cache:                       512 KiB
L2 cache:                        8 MiB
L3 cache:                        32 MiB
NUMA node0 CPU(s):               0-7
Vulnerability Itlb multihit:     Not affected
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Mmio stale data:   Not affected
Vulnerability Retbleed:          Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:        Mitigation; __user pointer sanitization
Vulnerability Spectre v2:        Mitigation; CSV2, BHB
Vulnerability Srbds:             Not affected
Vulnerability Tsx async abort:   Not affected
Flags:                           fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs

3. What did you see instead (Required)

TiFlash Compute Node (in Disagg Mode)only see 4 cores

tiflash.log:[2023/05/08 06:59:49.483 +00:00] [INFO] [getNumberOfCPUCores.cpp:72] ["logical cpu cores: 8, hardware logical cpu cores: 8, hardware physical cpu cores: 4, physical cpu cores: 4, number_of_physical_cpu_cores: 4"] [thread_id=1]
tiflash.log:[2023/05/08 06:59:49.591 +00:00] [INFO] [Server.cpp:1564] ["Available RAM = 66606178304; physical cores = 4; logical cores = 8."] [thread_id=1]

4. What is your TiFlash version? (Required)

master

[guo-shaoge]

Related code: https://github.com/pingcap/tiflash/blob/master/dbms/src/Server/Server.cpp#L1037

[guo-shaoge]

Use this command: tiup playground --without-monitor --tiflash 1 on the same machine, and check the log of tiflash:

[2023/05/08 08:16:59.748 +00:00] [INFO] [getNumberOfCPUCores.cpp:72] ["logical cpu cores: 8, hardware logical cpu cores: 8, hardware physical cpu cores: 8, physical cpu cores: 8, number_of_physical_cpu_cores: 8"] [thread_id=1]
[2023/05/08 08:16:59.748 +00:00] [INFO] [Server.cpp:1064] ["ServerInfo: CPU: \n     logical cores: 8\n     physical cores: 8\n     frequency: 0MHz\n     l1 cache size: 65536\n     l1 cache line size: 64\n     l2 cache size: 1048576\n     l2 cache line size: 64\n     l3 cache size: 33554432\n     l3 cache line size: 64\n     arch: arm64\nDisk: \n     name: /dev/nvme1n1p1\n     type: SSD\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /tiflash/log\n     fstype: ext4\nDisk: \n     name: /dev/nvme1n1p1\n     type: SSD\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /etc/hosts\n     fstype: ext4\nDisk: \n     name: /dev/nvme1n1p1\n     type: SSD\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /dev/termination-log\n     fstype: ext4\nDisk: \n     name: /dev/nvme1n1p1\n     type: SSD\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /etc/hostname\n     fstype: ext4\nDisk: \n     name: /dev/nvme1n1p1\n     type: SSD\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /etc/resolv.conf\n     fstype: ext4\nDisk: \n     name: /dev/nvme3n1\n     type: SSD\n     total space: 116060844032\n     free space: 111166472192\n     mount point: /data\n     fstype: ext4\nDisk: \n     name: overlay\n     type: UNKNOWN\n     total space: 21113950208\n     free space: 11979235328\n     mount point: /\n     fstype: overlay\nMemory: \n     capacity: 66606178304\n"] [thread_id=1]

So the number of physical cores collected by proxy is correct. So we need to copy proxy code for CN.( Because CN doesn't start proxy).