Encontre quais núcleos HT estão compartilhando um núcleo físico em / proc / cpuinfo

Há um computador com duas CPU "Xeon (R) CPU X5550 a 2.67GHz". O Hyper-threading está ativado, por isso parece um sistema de 16 núcleos, mas na verdade existem apenas 8 núcleos físicos.

Eu sei que quando o hyperthreading está ativado, cada núcleo físico é dividido em dois núcleos virtuais. Quero saber qual par de núcleos virtuais compartilha um núcleo físico e quais não. Ou como (em que ordem) o Linux enumerará os núcleos HT em comparação com os núcleos reais. (a enumeração é feita para sched_setaffinitye tasksetmáscaras).

Eu tenho um despejo de /proc/cpuinfoarquivo do sistema.

Eu acho que é possível:

• CPU0-CPU7 não está compartilhando phys. testemunho. CPU8-CPU15 também. Mas o compartilhamento é em pares CPU0 + CPU8, CPU (i) + CPU (i + 8) e assim por diante.
• ou CPU0 + CPU1 são de físico único, CPU2 + CPU3, CPU (2 * i) + CPU (2 * i + 1).
• ou compartilhamento exótico de CPU0 + CPU15, CPU1 + CPU14 ...
• ou aleatório?

O momento difícil nesse caso é que existem 2 matrizes físicas da CPU (dois soquetes), e a recomendação usual de usar o campo "ID físico:" não pode ajudar

O cpuinfo:

processor   : 0
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 0
cpu cores   : 4
apicid      : 16
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.15
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 1
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 0
cpu cores   : 4
apicid      : 0
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5319.96
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 2
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 1
cpu cores   : 4
apicid      : 18
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.04
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 3
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 1
cpu cores   : 4
apicid      : 2
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.05
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 4
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 2
cpu cores   : 4
apicid      : 20
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.04
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 5
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 2
cpu cores   : 4
apicid      : 4
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.05
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 6
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 3
cpu cores   : 4
apicid      : 22
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.03
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 7
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 3
cpu cores   : 4
apicid      : 6
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.07
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 8
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 0
cpu cores   : 4
apicid      : 17
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.01
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 9
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 0
cpu cores   : 4
apicid      : 1
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.07
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 10
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 1
cpu cores   : 4
apicid      : 19
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.04
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 11
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 1
cpu cores   : 4
apicid      : 3
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.00
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 12
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 2
cpu cores   : 4
apicid      : 21
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.03
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 13
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 2
cpu cores   : 4
apicid      : 5
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.05
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 14
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 1
siblings    : 8
core id     : 3
cpu cores   : 4
apicid      : 23
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.02
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

processor   : 15
vendor_id   : GenuineIntel
cpu family  : 6
model       : 26
model name  : Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping    : 5
cpu MHz     : 2660.076
cache size  : 8192 KB
physical id : 0
siblings    : 8
core id     : 3
cpu cores   : 4
apicid      : 7
fpu     : yes
fpu_exception   : yes
cpuid level : 11
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips    : 5320.04
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

Os que compartilham o mesmo núcleo físico devem ter o mesmo ID do núcleo e ID físico, com número de processador diferente. Tente o seguinte:

cat /proc/cpuinfo |egrep "processor|physical id|core id" | sed 's/^processor/\nprocessor/g'

O problema já foi resolvido pelo Portable Hardware Locality (hwloc) .

Este utilitário mostrará como o sistema está organizado em termos de compartilhamento de pacotes físicos, caches, núcleos físicos. Também suporta HT e Linux.

Eu analiso / proc / cpuinfo como

paste <(cat /proc/cpuinfo | grep "core id") <(cat /proc/cpuinfo | grep "processor") | sed 's/[[:blank:]]/ /g' A saída na minha máquina é semelhante a: core id : 0 processor : 0 core id : 1 processor : 1 core id : 2 processor : 2 core id : 3 processor : 3 core id : 0 processor : 4 core id : 1 processor : 5 core id : 2 processor : 6 core id : 3 processor : 7 Esta mostra 4 núcleos com dois threads cada.