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16 Linux Server monitoring commands you should know

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 statistics, network IO Statistics, page break statistics, and more.You can see the above information through a curses-based class GUI interface.Nmon Monitoring Tools[07-pmap]The PMAP command displays the amount of memory that the process consumes.You can find the process that t

16 Linux Server monitoring commands you should know

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 statistics, network IO Statistics, page break statistics, and more.You can see the above information through a curses-based class GUI interf

Linux Memory addressing resolution __linux

for all page boxes, and a writeback policy is always used for write operations. 5. Convert Backup buffer tlb: In addition to hardware caching, a TLB cache is used to speed up the conversion of linear addresses. page pagination in 5.Linux The role of the Linux paging mechanism: The paging mechanism is done after the segment mechanism, which further converts the linear address to the physical address. Let's take a look at the hardware structure first: 80386 uses a

Centos7 under Installation Oracle11gr2

to redhat-7#cat/proc/version//view Linux system version#cat/etc/redhat-realease//View the CentOS system versionCentOS Linux release 7.2.1511 (Core)#vi/etc/redhat-realeaseRedhat-76. Modify Kernel parameters#vi/etc/sysctl.conf#System default ...#To override ...##For More ...Net.ipv4.icmp_echo_ignore_broadcasts = 1Net.ipv4.conf.all.rp_filter = 1Fs.file-max = 6815744 #设置最大打开文件数FS.AIO-MAX-NR = 1048576Kernel.shmall = 2097152 #共享内存的总量, 8G memory setting: 2097152*4

View the running space of a Linux Process

/lib/tls/i686/cmov/libnss_nis-2.11.1.sob7be7000-b7be8000 rw-p 00008000 08:01 17504 /lib/tls/i686/cmov/libnss_nis-2.11.1.sob7be8000-b7bfb000 r-xp 00000000 08:01 17494 /lib/tls/i686/cmov/libnsl-2.11.1.sob7bfb000-b7bfc000 r--p 00012000 08:01 17494 /lib/tls/i686/cmov/libnsl-2.11.1.sob7bfc000-b7bfd000 rw-p 00013000 08:01 17494 /lib/tls/i686/cmov/libnsl-2.11.1.soroot@dremi-desktop:~# pmap 59935993: bash08048000 668K r-x-- /bin/bash080ef000 24K rw--- /bin/bash080f50

Nginx Reverse proxy configuration

Main;Client_max_body_size 20M;Client_header_buffer_size 4k;Large_client_header_buffers 4 8k;Client_header_timeout 10;Client_body_timeout 10;Send_timeout 10;Sendfile on;Tcp_nopush on;Tcp_nodelay on;Keepalive_timeout 60;gzip on;Gzip_min_length 1k;Gzip_http_version 1.1;Gzip_buffers 4 8k;Gzip_comp_level 2;Gzip_types text/plainapplication/x-javascript text/css Application/xml;Gzip_vary on;server {Listen 80;server_name www.jason.com;Access_log Logs/access.

SSD SSD Usage Considerations

SSDs are structured and run differently from traditional hard drives, and are strongly recommended after purchase to achieve optimal operational performance and extend the life of the SSD. The first part of the following is some of the things you can find on the internet about SSD drives, which have been introduced a lot, We will not go into the details here. For more information, please find the relevant content on the Internet. The second part is I in the combination of various aspects of the

Nginx High concurrency parameter configuration and optimization of Linux kernel parameters

*worker_connections per nginx server.6. Keepalive_timeout60;KeepAlive time-out period.7. client_header_buffer_size4k;Client request the buffer size of the head, this can be set according to your system paging size, generally a request header size will not exceed 1k, but because the general system paging is greater than 1k, so this is set to paging size.The paging size can be obtained with the command getconf PAGESIZE .[Email protected] ~]# getconf PAGESIZE4096But there are also cases where clien

Inode nodes in Linux

inode with so much information to record? For this reason we set the Inode record block number to 12 direct, one indirect, one double indirect and one triple indirect.As shown in the following:Direct pointer: Number 1-12, each point to a data block, block block size of 4k, can hold up to 12*4k=48k files, if the file within 48k, you can use the direct pointer to find the location of the data block. Indirect

Detailed paging mechanism for memory addressing in Linux systems

The paging mechanism is performed after the segment mechanism to complete the linear-physical address conversion process. The segment mechanism converts the logical address into a linear address, and the paging mechanism further converts the linear address into a physical address. Paging in hardware The paging mechanism is enabled by the PG bit in CR0. such as pg=1, enable the paging mechanism, and use the mechanism described in this verse to convert the linear address to physical address. such

5K Screen New imac evaluation

trouble for other peripheral devices and third-party applications. And for the new 27-inch imac, the time seems to be back. 5120x2880 resolution, 14.7 million pixels is not only 1080P Full HD screen pixel 7 times times more than the current popular 4K resolution more than 67%, with four times times the standard Model 27-inch imac display number of pixels. What does such a screen mean to us? What kind of surprise does the visual experience at 5K reso

Origin Millennium How about the computer configuration?

disk identity, its read and write speed is 4 times times the average solid-state drive, impressive. There is no doubt that with the Samsung 950 Pro, so that Origin millennium the overall speed of operation is more ideal. 4K game with outstanding performance Origin Millennium in the choice of graphics card with other high-end game PC, for the latest Nvdiia GTX 1080, and the use of dual-card SLI, overclocking to 2000MHz. Obviously, this configuration

Oracle Technology: Heterogeneous database initialization large segment processing

related restrictions (unlikely) 3, goldengate software inherent mechanism, but also need to thoroughly read the official website documents 4, now as if to the target end of the final length of 4000byte (according to the database encoding different Chinese characters, letters, numbers), in this test, if the source end of the use of Ntext,target can only receive 1000 characters, if the text type, Can accept 1333 Chinese characters. 5, test Environment Description: SQL Server to Oracle 11g,sour

MIT6.828 Jos System LAB2

MIT6.828 lab2:http://pdos.csail.mit.edu/6.828/2014/labs/lab2/ LAB2 is mainly about the paging process of the system, there is a simple virtual address to the physical address of the process. About the system paging, the MIT6.828 virtual address into the physical address--level two paging: http://blog.csdn.net/fang92/article/details/47320747. The following are mainly lab2 of several exercise of the problem-solving process. 1. First Boot_alloc () function: static void * Boot_alloc (uint32_t N) {

Linux File system detailed

files the file system can establish is related to the number of inode, where there is enough space but not enough inode When the system reads the file, it needs to find the inode and analyze whether the permissions recorded by the inode are consistent with the user, and if so, to begin to actually read the contents of the block. Inode to record a lot of information, but only 128bytes, and Inode record a block number to spend 4byte, if I have a file 400MB and each block is

The paging mechanism of Linux memory addressing

paging mechanism sees the entire linear address space and the entire physical address space as composed of pages, and any page in the linear address space can be mapped to any page in the Physical address space (we call a page or page frame in the physical space)80386 pages that use 4K byte size. Each page has a length of 4 K bytes and is aligned on a 4K byte boundary, that is, the starting address of each

Linux XFS File System description Observation and Disk command explanation

line is set to 4K, so the entire file system capacity should be 4*65536*4k so big! The 2nd line of Sectsz refers to the logical magnetic region (sector) capacity set to 512bytes so big meaning. The bsize in line 4th refers to the capacity of block, each block is 4K meaning, a total of 262,144 blocks in this file system. The Sunit and Swidth in line 5

Asus Zenbook Pro UX501 Experience

machine uses a full size design, but the feel is not very flexible. One of the highlights of the Asus Zenbook Pro UX501 is the 15.6-inch 4K screen, yes, 3840*2160 Pixel's Super high-definition touch screen. The color of the screen is good, the touch is responsive and the perspective is very broad. Unfortunately, the 4K screen has become the biggest drag on Asus Zenbook Pro UX501 and will tell you why. Ac

Arm-linux Memory Management Learning Notes (1)-The hardware principle of the memory page table __linux

both section-mapping and page-mapping, so how do you distinguish between mapping, the key in the page directory entry with the minimum 2bit, as follows:MMU according to the page catalog entry minimum 2bit to determine what to do next, all 0, invalid page directory, MMU will send the CPU to issue an exception. Page-mapping will also be subdivided into coarse page table (thick page) and fine page table (fine page tables), whether the two-level page table maps 64k/

SATA,SAS,SSD read-write performance test results

http://blog.csdn.net/killmice/article/details/42745937 The test tool FIO is read sequentially as an example, with the following commands: fio-name IOPS-RW = Read-bs = 4k-runtime = 60-iodepth 32-filename/dev/sda6-ioengin E Libaio-direct = 1 where rw = read for random reads, BS = 4k for each read 4k, filename specifies the corresponding partition, here I am/dev/sd

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