How to tell 32 or 64 bit

esr has asked for the wisdom of the Perl Monks concerning the following question:

We recently had to purchase a new PC with Windows 7. I downloaded both the 32- and 64-bit versions from ActivePerl but I frankly can't remember which one I installed. Is there any way to tell now? The usual "uninstall or change a program" list in the Control Panel lists the Perl version number but not whether it is 32 or 64 bit.

Comment on How to tell 32 or 64 bit

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Re: How to tell 32 or 64 bit by bulk88 (Priest) on Oct 08, 2012 at 03:30 UTC
A 32 bit perl. `C:\p517\perl>perl -v This is perl 5, version 17, subversion 5 (v5.17.5 (v5.17.4-47-g432d456 +)) built for MSWin32-x86-multi-thread` [download] A 64 bit perl. `C:\Documents and Settings\Administrator\Desktop>perl -v This is perl 5, version 14, subversion 2 (v5.14.2) built for MSWin32-x +64-multi-thread` [download] To get it in a script `C:\p517\perl>perl -MConfig -e "print $Config{archname}" MSWin32-x86-multi-thread C:\p517\perl>` [download]	[reply] [d/l] [select]
Re^2: How to tell 32 or 64 bit by flexvault (Monsignor) on Oct 14, 2012 at 11:37 UTC
bulk88, I just used your code: `email7: perl -MConfig -E 'say $Config{archname};'` [download] for 4 different Perls built on Linux and 3 built on AIX/Unix computers and none of them had 32 or 64 in the response. I then looped on the %Config hash with 'grep 32' for all platforms and nothing looks consistent between Linux and AIX/Unix. If the original question was for Windows, I guess it works, but it doesn't seem to be a platform independent solution. Just a heads-up...Ed Update: After commenting, I reread the original post and you're solution was right on for windows. "Well done is better than well said." - Benjamin Franklin	[reply] [d/l]
Re: How to tell 32 or 64 bit by salva (Canon) on Oct 08, 2012 at 07:18 UTC
`perl -E 'say log(~0)/log(2)'` [download] update: Note that this command shows the number of bits on an IV, the type used internally by Perl to handle integers. Usually, it has the same number of bits as the CPU architecture but it is also possible to compile Perl for a 32 bits architecture while having 64 bits IVs. For instance, Debian does it.	[reply] [d/l]
Re^2: How to tell 32 or 64 bit by Tux (Canon) on Oct 08, 2012 at 09:23 UTC
UNTRUE!: `$ perl -wE'say log(~0)/log(2)' 64 $ perl -v This is perl 5, version 16, subversion 0 (v5.16.0) built for i686-linu +x-64int-ld $ ux Linux 3.4.6-2.10-desktop [openSUSE 12.2 (Mantis)] i386 Core(TM) i7-26 +20M CPU @ 2.70GHz/800(4) i686` [download] On 32bit systems I build my perl with -Duse64bitint and -Duselongdouble, so your statement will not work at all! Enjoy, Have FUN! H.Merijn	[reply] [d/l]
Re^2: How to tell 32 or 64 bit by Anonymous Monk on Oct 08, 2012 at 08:44 UTC
`$ perl -E 'say log(~0)/log(2)' 31.9999999996641` [download] Oh, damn. My bit is getting worn out.	[reply] [d/l]
Re^2: How to tell 32 or 64 bit by bulk88 (Priest) on Oct 08, 2012 at 15:09 UTC
`length(pack('J',0))` [download] in the past I used that, but then I realized that 64 bit IVs but 32 bit pointers and machine code Perls existed, so it is wrong. Another good way to telling is `perl -MConfig -e "print $Config{ptrsize}"` [download] which will return 4 or 8, and is NOT the IV size	[reply] [d/l] [select]
Re: How to tell 32 or 64 bit by ikegami (Patriarch) on Oct 10, 2012 at 02:06 UTC
The pointer and integers size are independent. `>perl -V:ptrsize ptrsize='4'; >perl -V:ivsize ivsize='4';` [download] You're probably talking about the ptrsize. (Multiply by 8.)	[reply] [d/l]
Re: How to tell 32 or 64 bit by thomas895 (Deacon) on Oct 09, 2012 at 04:01 UTC
Alternatively: `C:\> perl -MConfig -E "$t=[split(/-/,$Config{archname})]->[1];printf(q +{%d bit},$t eq "x86"?32:64)" 32 bit` [download] Only works on Windows, though. This is Just Another Way To Do It. :-) ~Thomas~ `confess( "I offer no guarantees on my code." );`	[reply] [d/l] [select]

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