NUMA cache

[HILL33LOVE (就是愛希爾)]

底下有個別執行
#dmidecode -t cache
#lstopo-no-graphics
的輸出結果

想請教兩個問題
Q1.Level 1 cache的Installed Size與Maximum Size都是顯示 256 kB
而在lstopo-no-graphics顯示卻是L1d L#0 (32KB) + L1i L#0 (32KB)
這兩邊指的L1是不一樣的東西嗎？

Q2.在lstopo-no-graphics輸出結果
在NUMA架構 每個Node都會有各自的RAM (此例是126GB)系統全部是252GB

那假設在NUMA Node 0裡面的core 1要執行一隻程式的記憶體如果要alloc超過126GB是可
以的嗎？

謝謝


# dmidecode -t cache
# dmidecode 2.12
SMBIOS 2.7 present.

Handle 0x0700, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 1
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 256 kB
        Maximum Size: 256 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Data
        Associativity: 8-way Set-associative

Handle 0x0701, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 2
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 2048 kB
        Maximum Size: 2048 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 8-way Set-associative

Handle 0x0702, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 3
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 20480 kB
        Maximum Size: 20480 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 20-way Set-associative

Handle 0x0703, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 1
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 256 kB
        Maximum Size: 256 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Data
        Associativity: 8-way Set-associative

Handle 0x0704, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 2
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 2048 kB
        Maximum Size: 2048 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 8-way Set-associative

Handle 0x0705, DMI type 7, 19 bytes
Cache Information
        Socket Designation: Not Specified
        Configuration: Enabled, Not Socketed, Level 3
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 20480 kB
        Maximum Size: 20480 kB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 20-way Set-associative

------------------------------------------------------------------------------
---
# lstopo-no-graphics
Machine (252GB)
  NUMANode L#0 (P#0 126GB)
    Socket L#0 + L3 L#0 (20MB)
      L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#
0)
      L2 L#1 (256KB) + L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#
2)
      L2 L#2 (256KB) + L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2 + PU L#2 (P#
4)
      L2 L#3 (256KB) + L1d L#3 (32KB) + L1i L#3 (32KB) + Core L#3 + PU L#3 (P#
6)
      L2 L#4 (256KB) + L1d L#4 (32KB) + L1i L#4 (32KB) + Core L#4 + PU L#4 (P#
8)
      L2 L#5 (256KB) + L1d L#5 (32KB) + L1i L#5 (32KB) + Core L#5 + PU L#5 (P#
10)
      L2 L#6 (256KB) + L1d L#6 (32KB) + L1i L#6 (32KB) + Core L#6 + PU L#6 (P#
12)
      L2 L#7 (256KB) + L1d L#7 (32KB) + L1i L#7 (32KB) + Core L#7 + PU L#7 (P#
14)
    HostBridge L#0
      PCIBridge
        PCI 8086:10fb
          Net L#0 "em1"
        PCI 8086:10fb
          Net L#1 "em2"
      PCIBridge
        PCI 8086:154d
        PCI 8086:154d
      PCIBridge
        PCI 1000:005b
          Block L#2 "sda"
      PCIBridge
        PCI 8086:1521
          Net L#3 "em3"
        PCI 8086:1521
          Net L#4 "em4"
      PCIBridge
        PCIBridge
          PCIBridge
            PCIBridge
              PCI 102b:0534
      PCI 8086:1d02
        Block L#5 "sr0"
  NUMANode L#1 (P#1 126GB) + Socket L#1 + L3 L#1 (20MB)
    L2 L#8 (256KB) + L1d L#8 (32KB) + L1i L#8 (32KB) + Core L#8 + PU L#8 (P#1)
    L2 L#9 (256KB) + L1d L#9 (32KB) + L1i L#9 (32KB) + Core L#9 + PU L#9 (P#3)
    L2 L#10 (256KB) + L1d L#10 (32KB) + L1i L#10 (32KB) + Core L#10 + PU L#10
(P#5)
    L2 L#11 (256KB) + L1d L#11 (32KB) + L1i L#11 (32KB) + Core L#11 + PU L#11
(P#7)
    L2 L#12 (256KB) + L1d L#12 (32KB) + L1i L#12 (32KB) + Core L#12 + PU L#12
(P#9)
    L2 L#13 (256KB) + L1d L#13 (32KB) + L1i L#13 (32KB) + Core L#13 + PU L#13
(P#11)
    L2 L#14 (256KB) + L1d L#14 (32KB) + L1i L#14 (32KB) + Core L#14 + PU L#14
(P#13)
    L2 L#15 (256KB) + L1d L#15 (32KB) + L1i L#15 (32KB) + Core L#15 + PU L#15
(P#15)

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推 ryoma617: Q1:L1 cache 都是指相同的東西，新的CPU，L1 cache會有
→ ryoma617: 兩個區域，L1i(instraction)與L1d(data)；不建議您用dmi
→ ryoma617: 查詢硬體資訊，因為此資詢是BIOS產生，硬體廠商常常不會
→ ryoma617: 特別調整此值，因此常會是錯誤資訊
推 ryoma617: Q2:NUMA只有在2個實體CPU以上的主機板才能在BIOS開啟此
→ ryoma617: 功能，此功能主要是在提高Memory performance，因此你可
→ ryoma617: 以存取Memory所有空間