One of our compute nodes runs ~30% slower than others. It has the exact same image so I am baffled why it is running slow . I have tested OMP and MPI benchmarks. Everything runs slower. The cpu usage goes to 2000%, so all looks normal there.

I thought it may have to do with cpu scaling, i.e when the kernel changes the cpu speed depending on the workload. But we do not have that enabled on these machines.


Here is a snippet from "cat /proc/cpuinfo". Everything is identical to our other nodes. Any suggestions on what else to check? I have tried rebooting it.

processor       : 19
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
stepping        : 4
cpu MHz         : 2500.098
cache size      : 25600 KB
physical id     : 1
siblings        : 10
core id         : 12
cpu cores       : 10
apicid          : 56
initial apicid  : 56
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
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 pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm ida arat xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms
bogomips        : 5004.97
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:



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