Re: What version am I running?

[ilrudie]

On my 64-bit system, it returns:

~: cat /boot/config-`uname -r` | grep X86_64
CONFIG_CRYPTO_AES_X86_64=m
CONFIG_CRYPTO_TWOFISH_X86_64=m
CONFIG_X86_64=y
CONFIG_X86_64_ACPI_NUMA=y

I'd refine ilrudie's command a bit further, and make it:

~: cat /boot/config-`uname -r` | grep CONFIG_X86_64=

which would return:

CONFIG_X86_64=y

Now the final test would be to see the output from a 64-bit user who has installed 32-bit ubuntu...

Thanks for the backup. Don't have my 64-bit box handy. I would be interested in what someone with a 64-bit chip and a 32-bit kernel would say. I imagine its going to say the same thing mine did though.

[ilrudie]

Also

file /boot/vmlinuz-`uname -r`

is an option. I get

 Linux kernel x86 boot executable

along with some other junk on ubuntu and

 ELF 32-bit LSB shared object

on centos. Both are 32-bit. Any one on a 64-bit box care to weigh in?
As a side note I think this is a pretty interesting question. It seems like it should be super simple but the answer doesn't seem to be.

[drs305]

Also

file /boot/vmlinuz-`uname -r`

is an option. I get

 Linux kernel x86 boot executable

along with some other junk on ubuntu and

 ELF 32-bit LSB shared object

on centos. Both are 32-bit. Any one on a 64-bit box care to weigh in?
As a side note I think this is a pretty interesting question. It seems like it should be super simple but the answer doesn't seem to be.

64-bit system/machine:

/boot/vmlinuz-2.6.24-19-generic: Linux kernel x86 boot executable RO-rootFS, root_dev 0x801, swap_dev 0x1, Normal VGA

It doesn't look like this sheds much light. I PM'd you about posting a request on the 64-bit forum for the results of the previous command on a 64-bit machine running 32-bit ubuntu.

Maybe there should be a warning halfway down this thread with a warning:

Caution: Geeks only from this point forward.

[3rdalbum]

I'd refine ilrudie's command a bit further, and make it:

~: cat /boot/config-`uname -r` | grep CONFIG_X86_64=

which would return:

CONFIG_X86_64=y

Now the final test would be to see the output from a 64-bit user who has installed 32-bit ubuntu...

There is no output when you are running a 32-bit Ubuntu on a 64-bit machine.

[ilrudie]

Hmmm... I was thinking that it may work better than the original post I made and you tweaked. Unfortunate that Ubuntu doesn't seem to differentiate 64 and 32 bit binaries with file. Probably has something to do with the magic file uses but I really don't feel like mucking with it right now. A friend of mine confirmed it works for Power PC under fedora though. I agree with your assertion that the question has pretty much been answered and the search for the best answer is really just a geek quest at this point.

Also the presence of /proc/sys/kernel/vsyscall64 indicates an X86_64 kernel.

[ilrudie]

There is no output when you are running a 32-bit Ubuntu on a 64-bit machine.

Yeah. Thats what I would have guessed. It should say
# CONFIG_X86_64 is not set in the config file but the grep pattern won't match that because of the '='

[nikloleta]

Try uname -a

[ilrudie]

Try uname -a

returns the type of hardware the kernel is running on (among a myriad of other things) but not what type of kernel is running*. This has been discussed above already.

*unless the name/revision of the kernel happens to include if its 64bit or not which some kernels may include but Ubuntu's doesn't seem to.

[bodhi.zazen]

returns the type of hardware the kernel is running on (among a myriad of other things) but not what type of kernel is running*. This has been discussed above already.

*unless the name/revision of the kernel happens to include if its 64bit or not which some kernels may include but Ubuntu's doesn't seem to.

uname -a shows the arch of the current running kernel.

i686 = 32 bit

x86_64 = 64 bit

cat /proc/cpuinfo shows cpu info

[drs305]

uname -a shows the arch of the current running kernel.

i686 = 32 bit

x86_64 = 64 bit

cat /proc/cpuinfo shows cpu info

That's what I always thought but Sef brought up a good point. If you look at the man page for uname it says:

 
-m, --machine
    print the machine hardware name

The -m switch would be the part of -a that prints out the "x86_64", which it would seem is the machine architecture - or is the man page just poorly worded...