CentOS VPS Web Hosting 32-bit vs 64-bit?

jay28lee used Ask the Experts™
My hosting provides both 32-bit and 64-bit CentOS template for my VPS, what are the differences between the two?

Compatibility issue?  What would be the decision factors?

Which one should I choose?  64-bit naturally looks more appealing.
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System Architect
You can always run 32bit applications on a 64bit machine so for compatibility with 32bit applications it will not be a problem.

1- You can make use of 64bit for higher memory (Higher than 4GB although you can achieve up to 16GB memory with a 32 bit PAE kernel)

2- CPU intensive apps that make use of 64bit in their calculations. (It might be faster for some apps)

But as a VPS for hosting I personaly don't find any requirments for having a 64bit machine

3- The only case might be if you have a vendor specific app that would not be supported for a 32bit machine. (NetBackup Agent is one). In  this case you should consider the 64bit.


so for basic LAMP VPS hosting with CentOS, 64bit will still give me an advantage if i expand my usage to over 4GB memory usage right?

i'm not planning to use any other cpu intensive apps or vendor specific app.
Kerem ERSOYPresident

First of all 64-systems are good for large memory. If you'll ever need more than 4 GB of memory I'll suggest you to select 64-bit installation. It seems that  32-bit systems are getting obsolete as the memory requirements are above 4GB. It seems that in  a very near future we wont have 32 bit distros or may be some limited editions which is for backwards compatibility.

So if you want to be on the safe side go for the 64-bit editions it will make your future upgrade processes a bit easier. Furthermore all 64 -bit system can run 32-bit code iy you have one. So don't hesitate.


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