[EdLUG] How to tell if a computer is 32 bit or 64 bit

[Edinburgh Linux Users Group]

Hi Roy,

I ran this command:

$ cat /proc/cpuinfo > /home/cje/Documents/cpuinfo01.txt

And got a fairly extensive output.  I have edited it below.  The word flags
appeared 2x, and here are those lines, not sure what they show, although I
do see the number 64, but 64 what?

==========
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 nx lm constant_tsc
arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2
ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida dtherm tpr_shadow vnmi
flexpriority

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 nx lm constant_tsc
arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2
ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida dtherm tpr_shadow vnmi
flexpriority
==================

The other interesting thing is the following, which I am not sure is
evidence of 32 bit or 64 bit.  It would appear to me to be 64 bit:

==============================
<snip>
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
===================

Thanks everyone for your help!






On Fri, Jul 29, 2016 at 11:08 AM, Edinburgh Linux Users Group <
edlug at lists.edlug.org.uk> wrote:

> On 2016.07.29 07:26, Edinburgh Linux Users Group wrote:
> > Hi,
> >
> > I was just given a notebook and am trying to tell if it is 32 bit or
> > 64 bit.
> [snip]
> > --
> > Christian Einfeldt
> >
>
> ------quoted attachment------
> > _______________________________________________
> > EdLUG mailing list
> > EdLUG at lists.edlug.org.uk
> > https://lists.edlug.org.uk/mailman/listinfo/edlug
> >
>
> Christian,
>
> Boot a random linux and inspect the FLAGS line in /proc/cpuinfo
> for the lm flag .Its a very long line and will wrap. Here's a small
> section ot mine, showing the lm flag.
> ... fxsr_opt pdpe1gb rdtscp lm 3dnowext ...
>
> Regards,
>
> Roy Bamford.
> _______________________________________________
> EdLUG mailing list
> EdLUG at lists.edlug.org.uk
> https://lists.edlug.org.uk/mailman/listinfo/edlug
>



-- 
Christian Einfeldt
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