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I sshed into a computer at my job with an Intel Xeon E5-2686 v4 CPU, which the internet reports as having 18 physical cores. However, I appear to only be able to use, or see, two of them. Python's psutil.cpu_count() and multiprocessing.cpu_count() both agree that I have 4 cores, with half of them being logical cores. The performance of my multi-threaded Python application also made it clear that I was only using two cores. lscpu outputs the following:

Architecture:        x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:          Little Endian

CPU(s):              4

On-line CPU(s) list: 0-3

Thread(s) per core:  2

Core(s) per socket:  2

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

CPU family:          6

Model:               79

Model name:          Intel(R) Xeon(R) CPU E5-2686 v4 @ 

2.30GHz

Stepping:            1

CPU MHz:             2300.129

BogoMIPS:            4600.13

Hypervisor vendor:   Xen

Virtualization type: full

L1d cache:           32K

L1i cache:           32K

L2 cache:            256K

L3 cache:            46080K

NUMA node0 CPU(s):   0-3

Flags:               fpu vme de pse tsc msr pae mce cx8 

apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr 

sse sse2 ht syscall nx pdpe1gb rdtscp lm constant_tsc 

rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma 

cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt 

tsc_deadline_timer aes xsave avx f16c rdrand hypervisor 

lahf_lm abm cpuid_fault invpcid_single pti fsgsbase 

bmi1 avx2 smep bmi2 erms invpcid xsaveopt

Does anyone know what's going on here? If this is an 18-core CPU model, why wouldn't it show me all its cores? Could this be some unintentional restriction on my account?

cpu multithreading lscpu

share|improve this question

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

add a comment | 

0

I sshed into a computer at my job with an Intel Xeon E5-2686 v4 CPU, which the internet reports as having 18 physical cores. However, I appear to only be able to use, or see, two of them. Python's psutil.cpu_count() and multiprocessing.cpu_count() both agree that I have 4 cores, with half of them being logical cores. The performance of my multi-threaded Python application also made it clear that I was only using two cores. lscpu outputs the following:

Architecture:        x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:          Little Endian

CPU(s):              4

On-line CPU(s) list: 0-3

Thread(s) per core:  2

Core(s) per socket:  2

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

CPU family:          6

Model:               79

Model name:          Intel(R) Xeon(R) CPU E5-2686 v4 @ 

2.30GHz

Stepping:            1

CPU MHz:             2300.129

BogoMIPS:            4600.13

Hypervisor vendor:   Xen

Virtualization type: full

L1d cache:           32K

L1i cache:           32K

L2 cache:            256K

L3 cache:            46080K

NUMA node0 CPU(s):   0-3

Flags:               fpu vme de pse tsc msr pae mce cx8 

apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr 

sse sse2 ht syscall nx pdpe1gb rdtscp lm constant_tsc 

rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma 

cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt 

tsc_deadline_timer aes xsave avx f16c rdrand hypervisor 

lahf_lm abm cpuid_fault invpcid_single pti fsgsbase 

bmi1 avx2 smep bmi2 erms invpcid xsaveopt

Does anyone know what's going on here? If this is an 18-core CPU model, why wouldn't it show me all its cores? Could this be some unintentional restriction on my account?

cpu multithreading lscpu

share|improve this question

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

add a comment | 

I sshed into a computer at my job with an Intel Xeon E5-2686 v4 CPU, which the internet reports as having 18 physical cores. However, I appear to only be able to use, or see, two of them. Python's psutil.cpu_count() and multiprocessing.cpu_count() both agree that I have 4 cores, with half of them being logical cores. The performance of my multi-threaded Python application also made it clear that I was only using two cores. lscpu outputs the following:

Architecture:        x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:          Little Endian

CPU(s):              4

On-line CPU(s) list: 0-3

Thread(s) per core:  2

Core(s) per socket:  2

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

CPU family:          6

Model:               79

Model name:          Intel(R) Xeon(R) CPU E5-2686 v4 @ 

2.30GHz

Stepping:            1

CPU MHz:             2300.129

BogoMIPS:            4600.13

Hypervisor vendor:   Xen

Virtualization type: full

L1d cache:           32K

L1i cache:           32K

L2 cache:            256K

L3 cache:            46080K

NUMA node0 CPU(s):   0-3

Flags:               fpu vme de pse tsc msr pae mce cx8 

apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr 

sse sse2 ht syscall nx pdpe1gb rdtscp lm constant_tsc 

rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma 

cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt 

tsc_deadline_timer aes xsave avx f16c rdrand hypervisor 

lahf_lm abm cpuid_fault invpcid_single pti fsgsbase 

bmi1 avx2 smep bmi2 erms invpcid xsaveopt

Does anyone know what's going on here? If this is an 18-core CPU model, why wouldn't it show me all its cores? Could this be some unintentional restriction on my account?

cpu multithreading lscpu

share|improve this question

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

Architecture:        x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:          Little Endian

CPU(s):              4

On-line CPU(s) list: 0-3

Thread(s) per core:  2

Core(s) per socket:  2

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

CPU family:          6

Model:               79

Model name:          Intel(R) Xeon(R) CPU E5-2686 v4 @ 

2.30GHz

Stepping:            1

CPU MHz:             2300.129

BogoMIPS:            4600.13

Hypervisor vendor:   Xen

Virtualization type: full

L1d cache:           32K

L1i cache:           32K

L2 cache:            256K

L3 cache:            46080K

NUMA node0 CPU(s):   0-3

Flags:               fpu vme de pse tsc msr pae mce cx8 

apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr 

sse sse2 ht syscall nx pdpe1gb rdtscp lm constant_tsc 

rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma 

cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt 

tsc_deadline_timer aes xsave avx f16c rdrand hypervisor 

lahf_lm abm cpuid_fault invpcid_single pti fsgsbase 

bmi1 avx2 smep bmi2 erms invpcid xsaveopt

share|improve this question

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

share|improve this question

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges

asked 38 mins ago

ZorgothZorgoth

12633 bronze badges