linux performance monitoring commands

Linux has a number of excellent tools to help us analyze the performance metrics of the server and assist in the development of debugging work. The following lists only the underlying commands and are generally integrated into a Linux environment without having to be installed again. More detailed

all Socke information -R: Show routing Information -I: Display network card excuse statistics -S: Show Network protocol statistics [06-nmon]Nmon is the abbreviation for Nigel's Monitor, which is a well-known tool for monitoring the performance of Linux systems.Nmon can see processor utilization, memory usage, run queue information, disk IO stati

First, we understand the virtual memory and physical memory: the virtual memory is to use the hard disk to expand the physical memory, write unused memory pages to the hard disk to free up more physical memory for use by processes in need. When these memory pages require pi, they are read back from the hard disk. All this is transparent to users. In Linux, virtual memory is a swap partition. On X86 systems, the virtual memory is divided into 4 K pages

A disk is usually the slowest subsystem of a computer, and it is also the most prone to performance bottlenecks, because the disk is the farthest from the CPU and the CPU access to the disk involves mechanical operations, such as rotating shafts and track searching. The speed difference between hard disk access and memory access is calculated by an order of magnitude, just like A disk is usually the slowest subsystem of a computer, and it is also the

/s rkb/s wkb/s avgrq-sz avgqu-sz await r_await w_await SVCTM%utilVDA 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00iostat-x VDA 1 2 command meaning: Every 1 seconds print the VDA this disk usage information, print two times altogether. %util indicates CPU busy, higher and busierUniversal Command-SAR(System Activity Report) is one of the most comprehensive systems performance analysis tools available on

swpd freeFrom the above data you can see the points: Context Switch (CS) is much higher than interrupts (in), which means the kernel has to switch processes back and forth; Further observation shows that system time (SY) is very high and user time (US) is low, plus a high-frequency context switch (CS), indicating that a large number of system calls are being invoked by the running application; Run Queue (R) is above 14 threads, according to the hardware configuration of thi

two concepts, swapping also translated into Exchange, In the operating system refers to the full exchange of a program to the hard disk to free up memory for the new program to use, and paging only the part of the Exchange Program (page) is a two different concepts. Pure swapping is hard to see in modern operating systems, because it is time-consuming and laborious and unnecessary for the entire program to be switched to a hard disk, and the modern operating system is basically paging or paging

First, glances:glances is a very good cross-platform performance monitoring tool that provides CPU, CPU queue, memory, virtual memory, network, I/O, and the list of processes that most occupy the server's resources.Indicator monitoring information, and at run time depending on the resource usage of different color labeling its importance, very intuitive, the foll

A fully running Linux system consists of many subsystems (introduction, Cpu,memory,io,network, ...). ), monitoring and evaluating these subsystems is part of the performance monitoring. We often need macroscopic view of the whole system state, also need microscopic look at the operation of each subsystem. Fortunately,

Linux performance monitoring and analysis tool background recently, a pre-developed system performance test is required. The system is deployed on the Linux server cluster. In high concurrency and high load scenarios, you can collect all the information (including CPU, memor

Nmon (named Nigel's Monitor) is a computer performance system monitoring tool developed by IBM employees Nigel Griffiths for AIX and Linux systems. Nmon can display the operating system statistics on the screen or stored in a data file to help understand the use of computer resources, adjust direction and system bottlenecks. This system benchmark tool only needs