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Questions tagged [64bit]

When your question involves conversions to/from or idiosyncrasies of running on a CPU that uses 64-bit addresses.

Questions on this site with the tag involve software (applications or kernels) that are converting to or from, or are running on, a 64-bit CPU -- that is, one that natively addresses memory in 64-bit widths.

Popular questions in this tag are:

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209 questions
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6 answers

is my linux ARM 32 or 64 bit?

under an intel I know I can look at the outcome of uname -m to know if my OS is 32 or 64 bit, but under ARM this gives: armv7l I deduced from file /usr/bin/ls that I'm on a 32-bit OS, but how can I know this in an easier way?
Chris Maes
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How do I run 32-bit programs on a 64-bit Debian/Ubuntu?

I have a 64-bit (amd64 a.k.a. x86_64) Debian or Ubuntu installation. I need to run 32-bit (i386/i686) programs occasionally, or to compile programs for a 32-bit system. How can I do this with a minimum of fuss? Bonus: what if I want to run or test…
Gilles 'SO- stop being evil'
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2 answers

Why are 64-bit distros often called 'amd64'?

I am downloading an ISO image of Lubuntu; they have two versions: 32 and 64. But why do they call the 64 version amd64 since they say that it works for Intel also?
Sigur
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8 answers

How to convert a 32-bit (x86) Debian-based system to 64-bit

I have a 32-bit system which runs on a 64-bit processor. How do I convert it to be all-64-bit, without re-installing? I have seen somewhere that it is doable as a result of the new Multiarch framework.
tshepang
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24
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1 answer

Where did /usr/lib64 go and what is /usr/lib/x86_64-linux-gnu?

I have two Ubuntu-x86_64 systems. One is version 10.04, the other 12.04 and there is a difference in the structure of the lib directories. This doesn't surprise me, but I'm curious if anyone knows why. Is there a good™ reason why? 10.04…
ephsmith
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23
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5 answers

How do I know that my CPU supports 64bit operating systems under Linux?

How can I find out that my CPU supports 64bit operating systems under Linux, e.g.: Ubuntu, Fedora?
LanceBaynes
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1 answer

How to tell if a running program is 64-bit in Linux?

In Mac OS X, I could use the Activity Monitor program to see if a running program/process is 64-bit. How do I do that in a Linux OS, regardless of flavour?
hpy
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19
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2 answers

Determine if a specific process is 32- or 64-Bit

Given a 2.6.x or newer Linux kernel and existing userland that is capable of running both ELF32 and ELF64 binaries (i.e. well past How do I know that my CPU supports 64bit operating systems under Linux?) how can I determine if a given process (by…
Flexo
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18
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4 answers

32-bit, 64-bit CPU op-mode on Linux

I'm confused. Running Fedora Linux, lscpu yields: Architecture: i686 CPU op-mode(s): 32-bit, 64-bit ... But when I try to install a 64-bit program (Chrome) I get error like: Package /....x86_64.rpm has incompatible architecture…
Zak
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15
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4 answers

How was the shift to 64 bits handled on Linux

How was the transition to 64 bits handled on Linux/Unix? The Windows world still seems to have issues with it and I'm curious how it was handled in the *nix world.
Louis Salin
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4 answers

Running 64-bit Linux with 750 MB of RAM: worth it?

I have a Debian server VPS, and the provider installed 64-bit Debian 5. Should I ask for an 32-bit install, given that I have only 750 MB RAM and I have heard that variables take more RAM on 64-bit systems?
Jhonnytunes
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11
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3 answers

Is it worth reinstalling 64-bit Ubuntu instead of 32-bit on old hardware?

I have an old machine with an Intel D2700DC motherboard. I use it as a home server for some side projects. I have Ubuntu 32-bit installed on it, but recently figured out that its embedded D2700DC CPU is actually a 64-bit processor. My question is…
Alex
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1 answer

How can I determine if my processor is 64 or 32 bit?

Possible Duplicate: How do I know that my CPU supports 64bit operating systems under Linux? I am running Debian Squeeze, how can I determine whether my processor is 64 or 32-bit? I'm thinking of downloading a 64-bit OS because it's said to…
Zignd
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11
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2 answers

How can I install a 64bit Linux virtual machine on a 32bit Linux?

I've got a computer (Intel core i5) with 32bit Linux installed (ubuntu 11.04) and I would like to install a 64bit Linux virtual machine on it so I can test 64bit command-line applications on it.
719016
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3 answers

Run 64-bit app on 32-bit Ubuntu system

All the questions I've seen refer to running a 32-bit app in a 64-bit system. I'm running 32-bit Ubuntu 12.04 (actually elementary OS Luna, which is based on it) and I'm trying to run a 64-bit app which refuses open. Running: ./64bit_app.run (where…
Gabriel
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