LINUX下如何判断CPU和系统是32位还是64位

1. 在LINUX下怎样决断你的CPU是32位还是64位?

打入下面的命令

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grep flags /proc/cpuinfo

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flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm nx lm

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm nx lm

如果找到lm, 则说明你的CPU是64位的. lm是long mode的意思.

Long Mode - 64位CPU
Real Mode - 16位CPU
Protected Mode - 32位CPU

2. Linux下判断你是32系统还是64位系统.

打入下面的命令

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uname -a

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Linux test-12.6.18-92.el5#1 SMP Tue
Apr 29 13:16:12 EDT 2008 i686

Linux test-1 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:12 EDT 2008 i686

i386, i686说明你是32位的内核, 跑的是32位的系统.

输出2

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Linux test-22.6.18-92.el5#1 SMP Tue
Apr 29 13:16:15 EDT 2008 x86_64

Linux test-2 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:15 EDT 2008 x86_64

x86_64则说明你是64位内核, 跑的是64位的系统.

如果你cpuinfo的输出有lm标志, 而uname -a命令的输出是i386或i686, 说明你是64位的CPU跑的32位的系统.

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getconf LONG_BIT

64位系统下显示 64

32位系统下显示 32