Linux系统 查看系统版本 CPU 内存 主频等信息

1、显示操作系统的内核版本号

root@ATK-IMX6U:~# uname -aLinux ATK-IMX6U 4.1.15 #2 SMP PREEMPT Sat Jun 5 00:26:20 PDT armv7l armv7l armv7l GNU/Linux

2、查看系统主机名

root@ATK-IMX6U:~# cat /etc/hostnameATK-IMX6U

3、查看系统登录信息

root@ATK-IMX6U:~# cat /etc/issueFreescale i.MX Release Distro 4.1.15-2.1.0 \n \l

4、查看CPU相关信息

root@ATK-IMX6U:~# cat /proc/cpuinfoprocessor : 0model name: ARMv7 Processor rev 5 (v7l)BogoMIPS : 12.00Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpaeCPU implementer : 0x41CPU architecture: 7CPU variant: 0x0CPU part : 0xc07CPU revision : 5Hardware : Freescale i.MX6 Ultralite (Device Tree)Revision : 0000Serial: 0000000000000000

5、查看内存相关信息

root@ATK-IMX6U:~# cat /proc/meminfoMemTotal: 506884 kBMemFree:311732 kBMemAvailable:325904 kBBuffers: 7424 kBCached: 84268 kBSwapCached: 0 kBActive: 73800 kBInactive:69444 kBActive(anon):51752 kBInactive(anon):3716 kBActive(file):22048 kBInactive(file): 65728 kBUnevictable: 0 kBMlocked:0 kBHighTotal: 0 kBHighFree: 0 kBLowTotal: 506884 kBLowFree:311732 kBSwapTotal: 0 kBSwapFree: 0 kBDirty: 0 kBWriteback: 0 kBAnonPages: 51548 kBMapped: 57708 kBShmem: 3920 kBSlab: 10744 kBSReclaimable: 3816 kBSUnreclaim: 6928 kBKernelStack: 1216 kBPageTables:940 kBNFS_Unstable:0 kBBounce:0 kBWritebackTmp:0 kBCommitLimit:253440 kBCommitted_AS:237584 kBVmallocTotal: 1548288 kBVmallocUsed: 3820 kBVmallocChunk: 1367964 kBCmaTotal: 131072 kBCmaFree: 97240 kB

6、查看芯片内部内置传感器

root@ATK-IMX6U:~# cat /sys/class/thermal/thermal_zone0/temp60710

温度值：60710/1000 = 60.710°C

7、系统时钟与RTC

查看系统时钟

root@ATK-IMX6U:~# dateSat Jun 5 19:15:21 UTC

设置系统时钟

root@ATK-IMX6U:~# date -s "-06-05 20:00:00"Sat Jun 5 20:00:00 UTC

查看硬件（RTC）时钟

root@ATK-IMX6U:~# hwclockSat Jun 5 19:16:07 0.000000 seconds

将系统时间写入硬件 hwclock -w

root@ATK-IMX6U:~# hwclock -wroot@ATK-IMX6U:~# hwclockSat Jun 5 20:00:10 0.000000 seconds

8、查看CPU主频

root@ATK-IMX6U:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_freq198000 396000 528000 792000

输出的主频有198MHz，396MHz,528MHz,792MHz

1）查看CPU运行的主频

root@ATK-IMX6U:~# cpufreq-infocpufrequtils 008: cpufreq-info (C) Dominik Brodowski -Report errors and bugs to cpufreq@, please.analyzing CPU 0:driver: imx6q-cpufreqCPUs which run at the same hardware frequency: 0CPUs which need to have their frequency coordinated by software: 0maximum transition latency: 91.0 us.hardware limits: 198 MHz - 792 MHzavailable frequency steps: 198 MHz, 396 MHz, 528 MHz, 792 MHzavailable cpufreq governors: interactive, conservative, userspace, powersave, performancecurrent policy: frequency should be within 198 MHz and 792 MHz.The governor "performance" may decide which speed to usewithin this range.current CPU frequency is 792 MHz (asserted by call to hardware).cpufreq stats: 198 MHz:0.00%, 396 MHz:0.00%, 528 MHz:0.00%, 792 MHz:100.00% (1)

current CPU frequency is 792 MHz (asserted by call to hardware).并且有 792 MHz:100.00%

2）修改主频（不重新编译程序如何修改主频，临时修改系统重启失效）主频永久修改链接

申请用户空间控制CPU主频

echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

修改主频为198M

echo 198000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

查询修改后的值

root@ATK-IMX6U:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq198000

root@ATK-IMX6U:~# cpufreq-info...current CPU frequency is 198 MHz (asserted by call to hardware).cpufreq stats: 198 MHz:1.02%, 396 MHz:0.00%, 528 MHz:0.00%, 792 MHz:98.98% (2)

CPU主频已经修改为198M，并且主频使用已经1.02% ，系统运行会比较卡。