How I can find out on which platform I am running (32/64 bits)?

ruby-talk
1

I wonder whether within ruby there is a method to find out on which platform my application is running.

Unfortunately, the application has to know if it is a 32-bit or 64-bit system.

Any hints are highly appreciated.

Joachim Just

···

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2

untested, but

   [42].pack('L').size * 8 # => 32

this should be the number of bits per long.

you may also be able to get something from Config::CONFIG

hth.

-a

···

On Wed, 22 Jun 2005, Joachim Just wrote:

I wonder whether within ruby there is a method to find out on which platform my application is running.

Unfortunately, the application has to know if it is a 32-bit or 64-bit system.

Any hints are highly appreciated.

--

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phone :: 303.497.6469
My religion is very simple. My religion is kindness.
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===============================================================================

3

Hi,

"Joachim Just" <joachim.just@onlinehome.de> writes:

I wonder whether within ruby there is a method to find out on which
platform my application is running.

Unfortunately, the application has to know if it is a 32-bit or 64-bit
system.

Any hints are highly appreciated.

64-bit % ruby -ve 'p [0].pack("l!").size'
ruby 1.9.0 (2005-05-31) [x86_64-netbsd]
8

32-bit % ruby -ve 'p [0].pack("l!").size'
ruby 1.9.0 (2005-06-13) [i386-linux]
4

···

--
eban

4

WATANABE Hirofumi wrote:

Hi,

"Joachim Just" <joachim.just@onlinehome.de> writes:

I wonder whether within ruby there is a method to find out on which platform my application is running.

Unfortunately, the application has to know if it is a 32-bit or 64-bit system.

Any hints are highly appreciated.

64-bit % ruby -ve 'p [0].pack("l!").size'
ruby 1.9.0 (2005-05-31) [x86_64-netbsd]
8

32-bit % ruby -ve 'p [0].pack("l!").size'
ruby 1.9.0 (2005-06-13) [i386-linux]
4

That doesn't tell me much on Solaris:

>ruby -ve 'p [0].pack("l!").size'
ruby 1.8.2 (2004-12-25) [sparc-solaris2.10]

Ara's approach should work fine, though.

Finding the bitness of Ruby itself is easy. Finding a cross platform way to find the bitness of the OS itself is another matter. I'm not sure what the OP is after.

If anyone knows of a good, cross-platform way of finding the bitness of the OS itself, I'd like to know that myself. :slight_smile:

Regards,

Dan

5

Daniel Berger wrote:

WATANABE Hirofumi wrote:
> Hi,
>
> "Joachim Just" <joachim.just@onlinehome.de> writes:
>
>
>>I wonder whether within ruby there is a method to find out on which
>>platform my application is running.
>>
>>Unfortunately, the application has to know if it is a 32-bit or 64-bit
>>system.
>>
>>Any hints are highly appreciated.
>
>
>
> 64-bit % ruby -ve 'p [0].pack("l!").size'
> ruby 1.9.0 (2005-05-31) [x86_64-netbsd]
> 8
>
> 32-bit % ruby -ve 'p [0].pack("l!").size'
> ruby 1.9.0 (2005-06-13) [i386-linux]
> 4

That doesn't tell me much on Solaris:

>ruby -ve 'p [0].pack("l!").size'
ruby 1.8.2 (2004-12-25) [sparc-solaris2.10]

Ara's approach should work fine, though.

Finding the bitness of Ruby itself is easy. Finding a cross platform
way to find the bitness of the OS itself is another matter. I'm not
sure what the OP is after.

If anyone knows of a good, cross-platform way of finding the bitness of
the OS itself, I'd like to know that myself. :slight_smile:

Regards,

Dan

irb(main):001:0> [1].pack('L')
=> "\001\000\000\000"
irb(main):002:0> [0x01020304].pack('L')
=> "\004\003\002\001"

So I'm on a little endian machine.

-Charlie