Detailed explanation of Linux server status and performance related commands

Server Status Analysis

View Linux server CPU details

#View CPU information

[root@host ~]# cat /proc/cpuinfo

# View the number of physical CPUs

[root@host /]# cat /proc/cpuinfo | grep "physical id" | sort | uniq | wc -l

# View the number of cores of each physical CPU

[root@host /]# cat /proc/cpuinfo | grep "cpu cores" | uniq

#Number of logical CPUs (logical CPU = number of physical CPUs * number of cores)

[root@host /]# cat /proc/cpuinfo | grep "processor" | wc -l

Check the memory status of Linux server

# Check memory usage

[root@host ~]# free -m 
total used free shared buffers cached 
Mem: 372 256 115 0 17 158 
-/+ buffers/cache: 81 290 
Swap: 509 0 509

>total: total memory

>user: Amount of memory used

>free: free memory

> shared: the number of multi-process shared memories

>buffers: number of buffer memories

>cached: cache memory

Available memory = free+buffers+cached

Used memory = used-buffers-cached

swap The amount of swap memory. This item can be used to determine whether the memory is sufficient.

View Linux server hard disk usage

#View hard disk and partition information

fdisk -l

 [root@host ~]# fdisk -l 
Disk /dev/sda: 10.7 GB, 10737418240 bytes 
255 heads, 63 sectors/track, 1305 cylinders 
Units = cylinders of 16065 * 512 = 8225280 bytes 
Device Boot Start End Blocks Id System 
/dev/sda1 * 1 13 104391 83 Linux 
/dev/sda2 14 78 522112+ 82 Linux swap / Solaris 
/dev/sda3 79 1305 9855877+ 83 Linux 
# Check the disk space usage of the file system

df -h

[root@host ~]# df -h 
Filesystem Size Used Avail Use% Mounted on 
/dev/sda3 9.2G 6.4G 2.3G 74% / 
/dev/sda1 99M 12M 82M 13% /boot 
tmpfs 187M 0 187M 0% /dev/shm 
/dev/hdc 4.1G 4.1G 0 100% /mnt 

Server Performance Analysis

#Check the I/O performance of the hard disk

[root@host /]# iostat -d -x -k 1 5

#iostat is included in the systat package. In CentOs5.5, use the command yum -y install sysstat to install it.

I/0

Check the average load of Linux servers

[root@host /]# uptime 
12:39:12 up 2:50, 3 users, load average: 0.00, 0.03, 0.00 

[root@host /]# w 
12:39:59 up 2:50, 3 users, load average: 0.00, 0.03, 0.00 
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT 
root tty1 - 09:53 32:17 0.36s 0.36s -bash 
root pts/0 192.168.1.102 10:23 1:54m 0.03s 0.03s -bash 
root pts/1 192.168.1.105 12:16 0.00s 0.09s 0.02sw

Monitor the overall performance of your Linux server

Overall Performance

[root@host /]# vmstat 1 4 
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ 
rb swpd free buff cache si so bi bo in cs us sy id was 
0 0 0 50464 50096 101356 0 0 21 13 925 183 0 0 99 1 0 
0 0 0 50464 50096 101380 0 0 0 0 830 18 0 0 100 0 0 
0 0 0 50464 50096 101380 0 0 0 0 833 27 0 0 100 0 0 
0 0 0 50464 50104 101372 0 0 0 32 822 27 0 0 99 1 0

#proces r: Number of processes waiting to run b: Number of processes in non-interruptible sleep state w: Number of executable processes swapped out

#memory swpd: virtual memory usage fres: free memory buff: amount of memory used as cache (unit: KB)

#swap si: The number of swap pages swapped from disk to memory so: The number of swap pages swapped from memory to disk (unit: kb/second)

#io bi: number of blocks sent to the block device bo: number of blocks received from the block device (unit: blocks/second)

#system in: number of interrupts per second, including clock interrupts cs: number of environment (context) switches per second

#cpu us: CPU usage time sy: CPU system usage time id: idle time (unit: percentage)

Under standard conditions: r is less than 5, b is approximately 0

If user + sys is less than 70, the system performance is good; if it is greater than or equal to 85, the performance is poor.

View other parameters of the Linux server

Check the system kernel version number

[root@host /]# uname -a 
Linux host.domain.com 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux 
[root@host /]# uname -r 
2.6.18-194.el5

Check if the system is 32-bit or 64-bit

[root@host /]# ls -1F / |grep /$

Check if there is /lib64, if there is, the system is 64-bit

Another way to check whether the system is 32-bit or 64-bit

[root@host /]# file /sbin/init 
/sbin/init: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped

View information about the Linux distribution used by the server

[root@host /]# lsb_release -a 
LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch 
Distributor ID: CentOS 
Description: CentOS release 5.5 (Final) 
Release: 5.5 
Codename: Final

View the relevant modules loaded by the system

[root@host /]# lsmod |grep ip 
ipv6 435361 24 
xfrm_nalgo 43333 1 ipv6 
dm_multipath 56920 0 
scsi_dh 42177 1 dm_multipath 
dm_mod 101649 4 dm_mirror,dm_multipath,dm_raid45,dm_log

Check PCI settings in Linux. The lspci command can list PCI information in the machine, such as sound card, graphics card, Modem

[root@host /]# lspci | grep Ether 
02:01.0 Ethernet controller: Intel Corporation 82545EM Gigabit Ethernet Controller (Copper) (rev 01)

Summarize

The above are the Linux server status and performance related commands introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!