Available memory: Available memory=free+buffers+cached, i.e. 2021=235+394+1392Memory used: Used memory=used-buffers-cached, 30217=32003-394-1392When using Zabbix's own template OS Linux template to monitor the server, used memory is found to be too
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This article link address: Linux used memory exactly where it went.
A few days ago a pure classmate asked a question:
I PS aux see the RSS memory is
PhenomenonAn exception occurred in the log:' MaxMemory 'ReasonThe memory is full, no more data is allowed, and you can view the details of Redis via REDIS-CLI 127.0 . 0.1 : 6379 > info memory# memoryused_memory: 4120248 used_memory_human: 3.93m
The system administrator must maintain the healthy operation of their servers. One important part of this is memory. When server memory usage is too high, it degrades server performance. Linux has a tool called free to monitor memory usage.
What's
The system administrator must maintain the healthy operation of their servers. One important part of this is memory. When server memory usage is too high, it degrades server performance. Linux has a tool called free to monitor memory usage.
What's
Query free memory/memory usage status in Linux system View/remaining memory view How to calculate the amount of memory used and the amount of idlePhysical used memory = actual used memory-buffered-cache= 24752-2839-15049Physical free memory = Total
video memory, also called frame cache, is used to store video cards Chipprocessed or about to be extracted. renders the data. Like computer memory, video memory is used to store The part of the graphic information to process. RoleVideo MemoryLike
View free memory/physical memory usage/remaining memory in a Linux system
There are many ways to view system memory, but the main is to use the top command and free command
How do you see the results when you execute the top command? Here is a
The first two days a 128G memory of the Oracle host failed to trigger Kdump, eventually due to the lack of Var directory space, resulting in incomplete kdump generation. Combined with previous Redhat recommendations, crash set the space better than
Now the mobile phone on the suspension window applications more and more, for users, the most common suspension window application is the security software of the suspension of small control, take 360 guards, when the suspension window, it is a ball,
Recorded
Top
Column meaning
Vmstat
Procs
Memory
Swap
Io
System
Cpu
Uptime
Free
Iostat
Cpu
Device
Sar
Mpstat
Pmap
Netstat
Tcpdump
Strace
Lsof
Proc File system
Benchmark
Before Linux performance tuning, first need to understand the current service
Fly Volume patternFly Volume mode: efficiently supports a large number of fine-grained objects in a shared manner.Advantages:Reduce the number of instances of objects at run time.Centrally manage the state of many "virtual"
How does one install Mrtg in linux (CentOS? I. early stage ??? 1) MRTG must be based on the SNMP service. therefore, make sure that your system has enabled this service and modify the SNMP configuration: # vi/etc/snmp/snmpd. conf removes the comment
To view system Information:~# uname-a (Linux view version current operating system kernel information)Linux iz23onhpqvwz 3.13.0-30-generic #54-ubuntu SMP Mon June 9 22:47:59 UTC i686 i686 i686 gnu/linuxSee if it's CentOS or Ubuntu:[Email protected]:~
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1. Caching mechanism in order to improve the performance of the file system, the kernel uses a portion of physical memory to allocate buffers for caching system operations and data files, and when the kernel receives read-write requests, the kernel
1. Caching mechanismIn order to improve the performance of the file system, the kernel uses a portion of physical memory to allocate buffers for caching system operations and data files, and when the kernel receives read-write requests, the kernel
Monitor memory usage:Idea: Use Free-m to extract the relevant data, calculate the amount of memory input to the file, and each calculation is compared with the data in the current file, larger than the data in the file is replaced. Keep the maximum
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