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wiki:32_or_64_bit [2011/05/09 04:52] – created Guywiki:32_or_64_bit [2012/01/28 04:50] (current) – ke4nt
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-====== Find out if CPU is 32 or 64 bit ======+====== 32 or 64 bit CPU ======
  
-To find out if the CPU in a computer is 32 or 64 bit, open the terminal and type+To find out if the CPU in a computer is 32 or 64 bit, open the terminal and try these commands.
  
-<code>uname -m</code>+Good: 
 +'' " sudo cat /proc/cpuinfo | egrep -c lm " ''  ( if 1 or more, then lm = long mode = 64 bit ) 
 + 
 +Better: 
 +'' " sudo dmidecode -t processor | tail -3 " ''  ( Characteristics: 64 bit capable ) 
 + 
 +Best: 
 +'' " sudo getconf -a | grep LONG_BIT " ''   ( shows either 32 or 64 ) 
 + 
 + 
 + 
 +Note:  Using " uname -a " (or -m for short) only shows the type of kernel that is running. 
 + 
 +A 32 bit kernel ( i386, i586, i686 ) can be run on a 64 bit capable CPU. 
 + 
 +A 64 bit kernel ( x86_64 ) requires a 64 bit capable CPU to run. 
 + 
 + 
 +######################################################################## 
 + 
 + 
 +For example:  ( Two similar XEON DUAL CPU machines ) 
 + 
 + 
 +A 64 BIT CAPABLE CPU 
 + 
 +    " cat /proc/cpuinfo | grep processor " 
 +    processor   : 0 
 +    processor   : 1 
 +    processor   : 2 
 +    processor   : 3 
 + 
 + 
 + 
 +    " cat /proc/cpuinfo | egrep -c lm " 
 +    4 
 + 
 + 
 + 
 +    " dmidecode -t processor | grep Family " 
 +    Family: Xeon 
 +    Signature: Type 0, Family 15, Model 4, Stepping 1 
 +    Family: Xeon 
 +    Signature: Type 0, Family 15, Model 4, Stepping 1 
 + 
 + 
 + 
 +    " dmidecode -t processor | tail -3 " 
 +    Characteristics: 
 +    64-bit capable 
 + 
 + 
 + 
 +    " getconf -a | grep LONG_BIT " 
 +    LONG_BIT                            64 
 + 
 + 
 +######################################################################## 
 + 
 + 
 +A 32 BIT CAPABLE CPU (otherwise, a very similar machine) 
 + 
 +    " cat /proc/cpuinfo | grep processor " 
 +    processor   : 0 
 +    processor   : 1 
 +    processor   : 2 
 +    processor   : 3 
 +     
 + 
 + 
 +    " cat /proc/cpuinfo | egrep -c lm " 
 +    0 
 + 
 + 
 + 
 + 
 +    " dmidecode -t processor | grep Family " 
 +    Family: Xeon 
 +    Signature: Type 0, Family 15, Model 2, Stepping 9 
 +    Family: Xeon 
 +    Signature: Type 0, Family 15, Model 2, Stepping 9 
 + 
 + 
 + 
 + 
 +    " dmidecode -t processor | tail -3 " 
 +    L2 Cache Handle: 0x0703 
 +    L3 Cache Handle: Not Provided 
 + 
 + 
 + 
 + 
 +    " getconf -a | grep LONG_BIT " 
 +    LONG_BIT                           32
  
-If it is something like i586 or i686, it is 32 bit. 
  
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