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image format (1920x1080) and a data ratio, NHK has submitted a new draft of ITU-R BT.709 recommendations. 2 years later, with the addition of the 24/25 Hz format, HDTV began to emerge in the film industry. As a global cooperative project, the birth process of the 709 proposal is the crystallization of wisdom and the product of compromise.2.1.7ITU-R recommendation BT.2020In the second half of 2012, the International Telecommunication Union radiocommunication Sector (ITU-R) issued a new generatio

on;Keepalive_timeout 60;Fastcgi_cache_path/usr/local/nginx/fastcgi_cache Levels=1:2keys_zone=test:10minactive=5m;Fastcgi_connect_timeout 300;Fastcgi_send_timeout 300;Fastcgi_read_timeout 300;Fastcgi_buffer_size 4k;Fastcgi_buffers 8 4k;Fastcgi_busy_buffers_size 8k;Fastcgi_temp_file_write_size 8k;Fastcgi_cache TEST;Fastcgi_cache_valid 302 1h;Fastcgi_cache_valid 301 1d;Fastcgi_cache_valid any 1m;Fastcgi_cache

The send buffer size of the socket is 64512=63k, and the receive buffer size starts a thread when the client connection is received by the 8192=8k,server side, and the thread goes into a blocking state (only the data is read when the second connection is received). The client program starts to read the local file (greater than 1M) to send data to the server, each time to the output stream 1k data, sent to the 80th time the client also blocked, that is

SSD Performance testSequential Write 16k ioPS 85061.08Sequential Write 8k ioPS 146250.93Sequential Write 4k ioPS 239816.69Sequential write 2k ioPS 294540.87Sequential Write 1k ioPS 347170.06Random Write 16k ioPS 21865.24Random Write 8k ioPS 26602.18Random Write 4k ioPS 34485.49Random write 2k ioPS 35115.20Random Write 1k ioPS 34913.40Sequential Read 16k ioPS 157199.17Sequential Read

user process, the next packet of data into the system receive buffer when the previous packet of data is received, The user process takes data from the system receive buffer based on the pre-set buffer size, so that it takes more than one packet of data at a time. Subcontracting refers to the sub-processing of our receivers when there is a sticky packet. (will appear in long connections)when do I need to consider a half-pack case?From the note we learned that the default socket internal and out

Tagged with: Shanghai iOS Development Shanghai iOS Development Compensation Shanghai iOS Development engineerHow about the salary of iOS development in Shanghai ? Generally speaking, Shanghai iOS development salary is relatively good, after all, is a first-tier city of demons, overall is OK.Shanghai iOS development start salary probably in 5k~8k bar, if you are good, in the university is genius, to the computer is also very proficient, more than

;Fastcgi_cache_path/usr/local/nginx/fastcgi_cache Levels=1:2keys_zone=test:10minactive=5m;Fastcgi_connect_timeout 300;Fastcgi_send_timeout 300;Fastcgi_read_timeout 300;Fastcgi_buffer_size 4k;Fastcgi_buffers 8 4k;Fastcgi_busy_buffers_size 8k;Fastcgi_temp_file_write_size 8k;Fastcgi_cache TEST;Fastcgi_cache_valid 302 1h;Fastcgi_cache_valid 301 1d;Fastcgi_cache_valid any 1m;Fastcgi_cache_min_uses 1;Fastcgi_cach

message. The message type has the system message, the non-system message, the MSGV highest bit, also divides into the immediate processing type, and the thread processing type, MSGV the high order. The remaining 6 bits can represent 64 message types, and each message type has a maximum of 256 message values. In the message format, the destination address, and the source address is 2W; The message content is only 2 W. At present, there is only one kind of system message type: signal, there are o

Installing Webpack requires the node environment to be installed, so you need to install node in your PC. Node official website https://nodejs.org/, install the LTS version.WEBPCK Basic Concepts Entry: Analyzing the ingress of dependent modules Output: Export configuration Loaders: The processor for the resource module Plugins: Plug-ins for more complex and richer functionality Do a simple little case below1. Global Installation WebpackWindows users directly ExecuteInst

Today studied the way Ajax uses JSONP to make Cross-domain calls, finding that you can make cross-domain calls using Get and post methods, and here's a simple sharing, easy to use friend The client code nbsp; nbsp; code is as follows: ; nbsp; nbsp; JSON P Code: nbsp; nbsp; Copy code code as follows: Success_jsonpcallback ([{"City": "Guangzhou", "CompanyName": "POCO.") CN "," Createtime ":" 15:02 release "," Posiitondetailurl ":" http://www.lagou.com:80/jobs/16868.html "," Positionadvantage ":"

": "4k-7k"},{"City": "Beijing", "CompanyName": "Mei Tong Yun-Move (Beijing) Technology Co., Ltd." , "Createtime": "14:47 release", "Posiitondetailurl": "http://www.lagou.com:80/jobs/16866.html", "Positionadvantage": " HTML5 Technology best team, "Positionname": "Web Front-End Development", "salary": "4k-8k"},{"City": "Hangzhou", "CompanyName": "Pocket shopping", "Createtime": " 14:42 release "," Posiitondetailurl ":" http://www.lagou.com:80/jobs/13024

specific IO type, the result may be slightly skewed because the speed may be different. By adding ": This option controls the number Sequential produce order of offset Identical produces the same offset [Parameter notes] ' Sequential ' is for random io only. Typically, FIO will generate a new random io after each IO. E.g.rw=randread:8, the seek will be executed after every 8 Io, not after each IO. Sequential Io is already in order and then set to ' sequential ' will not produce any difference

compressed result data stream. For example, 4 4k represents 4k, and applies memory at 4 times times the size of the original data in 4k. 4 8k represents 8k as the original data size in 8k of 4 times times the application of memory. If not set, the default value is to request the same amount of memory space as the original data to store the gzip compression resu

reads from the cache to the appropriate hard disk controller via the hard disk interface.Hard disk Manufacturers in the hard disk parameters, usually also give a maximum transmission rate, such as now SATA3.0 6gbit/s, conversion is 6*1024/8,768mb/s, usually refers to the hard disk interface to the external maximum transmission rate, of course, the actual use is not up to this value.This calculates the IOPS, and conservatively chooses the actual internal transfer rate, taking 40m/s as an example

farm with many pigsty, each pigsty as a page for storing data. As a breeder, I suppose I'm buying and selling pig pigs, and I'm doing the pig right, but actually we're buying and selling on a pigsty, first of all, I'll number the pigsty, and then I'll buy the pigs in different numbers. So it could be understood that I kept the pig (data) in a pigsty (page) with different numbers (logically divided into 0-to-n sequential numbers), and I traded (I/O operations) The pigs, all from each pigsty. The

>linux Server installed the system, want to know whether the hard disk read and write to meet the needs of the service, if not meet the hard disk IO is a bottleneck of the service. So we need to test the hard disk read and write speed, testing a lot of methods, the following is the use of Linux with the DD command to test the read and write speed of the hard disk.Time has a timing function, DD is used for copying, read from If, write to of. If=/dev/zero does not produce IO, so it can be used to

needed to store each column. The driver also has the Fetchsize property, which is the number of rows returned per fetch. With the size and number of rows per column, the driver can calculate the maximum absolute length of the data returned by the fetch at a time. This is the size of the allocated buffer. Some large types, such as long and long RAW, are too large to be stored directly in the buffer to take another different approach. If the query result contains a long or long RAW, the memory pr

insufficient, maximum extension 5000MB ALTER DATABASE datafile ' D:\DataBase\Test.DBF ' autoextend on next 200m maxsize 5000m; --Extended infinite space alter DATABASE datafile ' D:\DataBase\Test.DBF ' autoextend on MaxSize Unlimited; Note Table space size limits Table space data file capacity and db_block_size, in the initial library, db_block_size to the actual needs, set to 4k,8k, 16K, 32K, 64K, and other sizes, Oracle's physical files only

various libraries and so shared modules that we use. You can use the PMAP directive to view detailed LIB libraries and used memory values for each process call. Take the simplest bash process here for example. [Root@91it ~]# pmap ' pgrep bash '1464:-bash0000000000400000 848K r-x--/bin/bash00000000006d3000 40K RW---/bin/bash00000000006dd000 20K rw---[anon]00000000008dc000 36K RW---/bin/bash00000000011a4000 396K rw---[anon]0000003ef9800000 128K r-x--/lib64/ld-2.12.so0000003ef9a1f000 4K R----/lib

The first thing to understand is two special devices: /dev/null: Recycle Bin, bottomless pit/dev/zero: Generating charactersØ Test Disk Write ability Time DD If=/dev/zero of=/test.dbf bs=8k count=300000 Because/dev//zero is a pseudo device that produces only a stream of empty characters and does not produce IO for it, IO is concentrated in the of file, and the of file is used only for writing, so this command is equivalent to the ability to write a