[lug] cpuinfo shows hyperthreading enabled, but no hyperthreading seen

[Michael Hirsch]

I haven't tried that.  This system isn't exactly a cluster, and I'm not
sure if the CPU supports it.  But it is an interesting tool I hadn't known
about.

I'm just trying to figure out why hyperthreading seems to be supported, but
isn't being used.  The real solution to our problem is to by a faster
machine with faster hard drives, but I'd like to know the answer to the
hyperthreading question.

Thanks,

Michael

On Fri, Oct 12, 2012 at 2:11 PM, Davide Del Vento <
davide.del.vento at gmail.com> wrote:

> Have you tried this
>
> http://software.intel.com/en-us/articles/using-enhanced-intel-speedstep-features-in-hpc-clusters
> ?
>
> On Fri, Oct 12, 2012 at 1:45 PM, Michael Hirsch <mdhirsch at gmail.com>
> wrote:
> > I have server with a single quad-core cpu.  It's a kinda old Xeon, and
> we'd
> > like to get the most out of it.  I had thought that it was a dual-core
> with
> > hyperthreading, but a bit more research shows that it is a quad-core
> with no
> > hyperthreading.
> >
> > As you can see from this output, there are 4 processors and 4 cores, all
> on
> > one physical id.  I think this means that there are no CPUs due to
> > hyperthreading.  If you look at the flags, it has "ht" that I thought
> meant
> > hyperthreading is enabled, both in the BIOS and in the kernel.  But
> > apparently not.
> >
> > Anyone know how to enable hyperthreading?
> >
> > [root at manzanita log]# grep -E "processor|physical id|core id|flags"
> > /proc/cpuinfo
> > processor       : 0
> > physical id     : 0
> > core id         : 0
> > 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 smx est tm2 ssse3
> > cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> > processor       : 1
> > physical id     : 0
> > core id         : 1
> > 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 smx est tm2 ssse3
> > cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> > processor       : 2
> > physical id     : 0
> > core id         : 2
> > 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 smx est tm2 ssse3
> > cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> > processor       : 3
> > physical id     : 0
> > core id         : 3
> > 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 smx est tm2 ssse3
> > cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> >
> > Thanks,
> >
> > Michael
> >
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