【原文链接】：http://blog.csdn.net/mdx20072419/article/details/7767809
http://blog.chinaunix.net/uid-22425237-id-3496577.html
-------------------------------------------------------------------------------------------------------------------------------------------------------------
# 总核数 = 物理CPU个数 X 每颗物理CPU的核数 # 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数 # 查看物理CPU个数 cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l # 查看每个物理CPU中core的个数(即核数) cat /proc/cpuinfo| grep "cpu cores"| uniq # 查看逻辑CPU的个数 cat /proc/cpuinfo| grep "processor"| wc -l
查看CPU信息（型号）
cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
查看内 存信息
# cat /proc/meminfo
-------------------------------------------------------------------------------------------------------------------------------------------------------------
查看逻辑CPU个数：
#cat /proc/cpuinfo |grep "processor"|sort -u|wc -l
24
查看物理CPU个数：
#grep "physical id" /proc/cpuinfo|sort -u|wc -l
2
#grep "physical id" /proc/cpuinfo|sort -u
physical id : 0
physical id : 1
查看CPU内核数：
#grep "core id" /proc/cpuinfo|sort -u|wc -l
8
查看每个物理CPU内核个数：
#grep "cpu cores" /proc/cpuinfo|uniq
cpu cores : 6
每个物理CPU上逻辑CPU个数：
#grep "siblings" /proc/cpuinfo|uniq
siblings : 12
判断是否开启了超线程：
如果多个逻辑CPU的"physical id"和"core id"均相同，说明开启了超线程
或者换句话说
逻辑CPU个数 > 物理CPU个数 * CPU内核数 开启了超线程
逻辑CPU个数 = 物理CPU个数 * CPU内核数 没有开启超线程
一次性查询所有信息：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
#!/bin/bashphysicalNumber=0coreNumber=0logicalNumber=0HTNumber=0logicalNumber=$(grep"processor"/proc/cpuinfo|sort-u|wc-l)physicalNumber=$(grep"physical
id"
/proc/cpuinfo|sort-u|wc-l)coreNumber=$(grep"cpu
cores"
/proc/cpuinfo|uniq|awk-F':''{print
$2}'|xargs)HTNumber=$((logicalNumber
/ (physicalNumber * coreNumber)))echo"******
CPU Information ******"echo"Logical
CPU Number : ${logicalNumber}"echo"Physical
CPU Number : ${physicalNumber}"echo"CPU
Core Number : ${coreNumber}"echo"HT
Number : ${HTNumber}"echo"*****************************" |
执行结果：
#./cpuinfo
****** CPU Information ******
Logical CPU Number : 24
Physical CPU Number : 2
CPU Core Number : 6
HT Number : 2
*****************************
-------------------------------------------------------------------------------------------------------------------------------------------------------------
查看当前操作系统内核信息
# uname -a
Linux redcat 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12 05:23:09 UTC 2010 i686 GNU/Linux
查看当前操作系统发行版信息
#cat /etc/issue
Ubuntu 9.10 /n /l
LSB Version: core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.0-ia32:graphics-3.0-noarch
Distributor ID: SUSE LINUX
Description: SUSE LINUX Enterprise Server 9 (i586)
Release: 9
Codename: n/a
查看cpu型号
# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
2 Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
(看到有2个逻辑CPU, 也知道了CPU型号)
查看cpu运行模式
# getconf LONG_BIT
32
(说明当前CPU运行在32bit模式下, 但不代表CPU不支持64bit)
查看cpu是否支持64bit
# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l
2
(结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit)
查看cpu信息概要（昨天看aix的时候刚发现的，在ubuntu上竟然也有~）：
#lscpu
Architecture: i686 #架构686
CPU(s): 2 #逻辑cpu颗数是2
Thread(s) per core: 1 #每个核心线程数是1
Core(s) per socket: 2 #每个cpu插槽核数/每颗物理cpu核数是2
CPU socket(s): 1 #cpu插槽数是1
Vendor ID: GenuineIntel #cpu厂商ID是GenuineIntel
CPU family: 6 #cpu系列是6
Model: 23 #型号23
Stepping: 10 #步进是10
CPU MHz: 800.000 #cpu主频是800MHz
Virtualization: VT-x #cpu支持的虚拟化技术VT-x(对此在下一博文中解释下http://hi.baidu.com/sdusoul/blog/item/5d8e0488def3a998a5c272c0.html)
L1d cache: 32K #一级缓存32K（google了下，这具体表示表示cpu的L1数据缓存为32k）
L1i cache: 32K #一级缓存32K（具体为L1指令缓存为32K）
L2 cache: 3072K #二级缓存3072K
最后来个大而全的：
#cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
stepping : 10
cpu MHz : 800.000
cache size : 3072 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida
tpr_shadow vnmi flexpriority
bogomips : 4788.60
clflush size : 64
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
stepping : 10
cpu MHz : 800.000
cache size : 3072 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida
tpr_shadow vnmi flexpriority
bogomips : 4787.96
clflush size : 64
power management:
补充，linux下通过c获取CPU个数信息
from: http://hi.baidu.com/hermitinhistory/blog/item/ce64d5fb6b23b71b6d22eb95.html
#include<stdio.h>
#include<unistd.h>
int main()
{
int cpu_num;
cpu_num = sysconf(_SC_NPROCESSORS_CONF);
printf("_SC_NPROCESSORS_CONF=%d/n",cpu_num);
cpu_num = sysconf(_SC_NPROCESSORS_ONLN);
printf("_SC_NPROCESSORS_ONLN=%d/n",cpu_num);
return 0;
}
/*
* - _SC_NPROCESSORS_CONF
* The number of processors configured.
*
* - _SC_NPROCESSORS_ONLN
* The number of processors currently online (available).
*/
Linux下获得CPU个数一个简单方法就是查看/proc/cpuinfo文件。看出现processor字样的行数是多少条，即有多少个逻辑CPU（包括多核，超线程）。
因此cmd下输入下面命令即可：
cat /proc/cpuinfo | grep processor | wc -l
因此c++程序中很自然的想到使用strstr函数查找processor关键词出现次数即可。
查看服务器型号（或者是生产厂家）：
#dmidecode | grep "Product Name"
Product Name: PowerEdge R710
Product Name: 0VWN1R
#dmidecode -t system
查看网卡信息：
#dmesg | grep -i eth
Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v1.9.3 (March 17, 2009)
eth0: Broadcom NetXtreme II BCM5709 1000Base-T (C0) PCI Express found at mem d6000000, IRQ 106, node addr a4badb28c33d
eth1: Broadcom NetXtreme II BCM5709 1000Base-T (C0) PCI Express found at mem d8000000, IRQ 114, node addr a4badb28c33f
eth2: Broadcom NetXtreme II BCM5709 1000Base-T (C0) PCI Express found at mem da000000, IRQ 122, node addr a4badb28c341
eth3: Broadcom NetXtreme II BCM5709 1000Base-T (C0) PCI Express found at mem dc000000, IRQ 130, node addr a4badb28c343
cnic: Added CNIC device: eth0
cnic: Added CNIC device: eth1
cnic: Added CNIC device: eth2
cnic: Added CNIC device: eth3
bnx2: eth0: using MSIX
ADDRCONF(NETDEV_UP): eth0: link is not ready
bnx2i: iSCSI not supported, dev=eth0
bnx2i: iSCSI not supported, dev=eth0
bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
eth0: no IPv6 routers present
process `sysctl' is using deprecated sysctl (syscall) net.ipv6.neigh.eth0.base_reachable_time; Usenet.ipv6.neigh.eth0.base_reachable_time_ms instead.