soundstation 2w

nproc 131072 * hard nproc 131072 * soft core unlimited * hard core unlimited * soft memlock 50000000 * hard memlock 50000000 Start the database # pg_ctl start -D $PGDATA # 或者使用如下的方式启动 pg_ctl -D /var/lib/pgsql/data -l logfile start -bash-4.2$ lsof logfile COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME postgres 30772 postgres 1w REG 8,3 0 34606128 logfile postgres 30772 postgres 2w REG 8,3 0 34606128 logfile -bash-4.2$ lsof -i:5432 COMMAND PID USER

, and the QPS peak in daily environments is around 1-2w).Support simple transaction requirements, but the industry use of the scene is very small, immature, both advantages and disadvantages.Redis consumes more memory on string types, and can use Dict (hash table) to compress storage to reduce memory consumption.Both MC and Redis are key-value types, are not suitable for establishing relationships between different datasets, and are not suitable for q

1w~2w fluctuations, far less than the requirement of 20 seconds to write 20w records.Storage by acquisition deviceYes, the above structure per indicator for each value is a record, is not too much waste? Is it possible to use the acquisition device + acquisition time as a record? The question is, how to solve the problem of different acquisition device properties? At this time, a colleague to play the talent, monitoring indicators + monitoring values

synchronous replication of data, support multi-level replication and incremental replication, master-slave mechanism is an important means of Redis ha.Single-threaded requests, all commands are executed serially, and there is no need to consider data consistency issues in the concurrency scenario.Support PUB/SUB Message subscription mechanism, can be used for message subscription and notification.Supports simple transaction requirements, but industry usage scenarios are rare and immature.Limita

performance, so the single instance CPU can reach 5-6wqps per second (depending on data structure, data size and server hardware performance, and the QPS peak in daily environments is around 1-2w). support simple transaction requirements, but the industry use of the scene is very small, immature, both advantages and disadvantages. Redis consumes more memory on string types, and can use Dict (hash table) to compress storage to reduce memory consumpt

is still in 5 seconds 1w~2w fluctuations, far less than the requirement of 20 seconds to write 20w records.　　Storage by acquisition deviceYes, the above structure per indicator for each value is a record, is not too much waste? Is it possible to use the acquisition device + acquisition time as a record? The question is, how to solve the problem of different acquisition device properties? At this time, a colleague to play the talent, monitoring indica

variable ordinal, and assigned. This paragraph is time consuming 35nsNe4:ALLOT1 (0.allot.0.1, 1.0,mem_xmub, mem_xmub. MAXLX1);R27.r26h = r0l; Save Block numberKy_init (); The block is initialized to a full 1;dmub.mlyxuw1.r0lr26l = 0; R28. r26h = 0X00FF;JMP NE2; This paragraph is time consuming 32.071us}releaseh{Entry: R0-R4, return R0: The unit number of the maximum number of consecutive units in a bitmap.R0-R4 = (0.release.1.0, the number of consecutive 1 digits released, dmub,dmub. MAXLX1, Un

mud ash) squint two or three hours, and then continue to dry, for one weeks in a row! Or you have to continue!Many people give a lot of ideas, but they seem to be useful and useless. Wait, why is "it seems useful, and it seems useless"? I seem to have grasped a direction in the faint, what is it exactly? By the way, verify that we are now running in the field environment, before no problem, does not mean that the current pressure is no problem, to analyze such a small function in a large system

Tags: partition slow log soc Default min eal namespace realloc log information1: Start three instances- /Home/mongodb/db27017/mongodb27017.conf -/ Home/mongodb/db27018/mongodb27018.conf -/ Home/mongodb/db27019/mongodb27019.conf The configuration file is as follows: Verbose=true #日志信息 vvvv=true #日志的级别 logpath=/Home/Mongodb/db27019/Log/Mongodb.Log#日志文件 logappend=true #设置文件记录格式TRUE为追加, false to overwrite P port= 27019#指定端口号 Maxconns= -#最大链接数, the default is the maximum of

lot of ideas, but they seem to be useful and useless. Wait, why is "it seems useful, and it seems useless"? I seem to have grasped a direction in the faint, what is it exactly? By the way, verify that we are now running in the field environment, before no problem, does not mean that the current pressure is no problem, to analyze such a small function in a large system, the impact is too big, we should break it down. Yes, it's "unit testing", which is the test of a single method, and we need to

Original link: http://blog.csdn.net/windren06/article/details/8188136Go A, b two tables, find the ID field, there is a table, but there is no data in table B. A total of 13w data, after the deduplication of about 3W data, b table has 2W data, and B table ID field is indexed.Method OneEasy to understand with not in, low efficiency ~ Execution Time: 1.395 seconds ~1 SELECT distinct a.id from A where a.id not in (select ID from B)Method TwoUse left Join

fluctuations, the actual does not affect. May affect some CPU count, but far from achieving my expectations, the speed of writing is still in 5 seconds 1w~2w fluctuations, far less than the requirement of 20 seconds to write 20w records. Storage by acquisition device Yes, the above structure per indicator for each value is a record, is not too much waste? Is it possible to use the acquisition device + acquisition time as a record? The ques

data query a lot faster. This feeling is very unreasonable, query should meger query faster. When using the generated SQL test, it was found that the creation index took up 99% of the time. The original business key of the view is not the primary key in the original table. After appending the original table to the corresponding index, the query is much faster. The associated tables are indexed one by one. After the above changes, the data page load page is very fast (around 0.1s). However, whe

-shop_price>200;+----------+---------+| goods_id | Sheng |+----------+---------+| 1 | 277.60 | | 9 | 459.60 | | 10 | 265.60 | | 13 | 262.20 | | 14 | 525.00 | | 17 | 460.00 | | 18 | 575.60 | | 21 | 400.00 | | 22 | 1199.80 | | 23 | 740.00 | | 24 | 400.00 | | 31 | 267.39 | | 32 | 602.00 |+----------+---------+13 rows in Set (0.12 sec) mysql> Select Goods_id,market_price-shop_price as ' Sheng ' frOm goods hav

and the associated filename. That is, we can find information about the file by accessing the file descriptor of the process. When a file in the system is accidentally deleted, as long as there is a process in the system that is accessing the file, then we can recover the contents of the file from the/proc directory by lsof.If the/var/log/messages file is deleted due to misoperation, then the method to restore the/var/log/messages file is as follows: First use lsof to see if there is currently

in daily environments is around 1-2w).Support simple transaction requirements, but the industry use of the scene is very small, immature, both advantages and disadvantages.Redis consumes more memory on string types, and can use Dict (hash table) to compress storage to reduce memory consumption.Both MC and Redis are key-value types, are not suitable for establishing relationships between different datasets, and are not suitable for query search. For e

+ (-a) = 0, A. (a-1) = 1 Computer operation and Finite field As you know every computer language, whether static or dynamic language, has its most basic data types, each data type has its data range, which determines that the operation must be a finite field operation. The finite field was first proposed by the mathematician Galois, a finite domain construction method even if it is proposed by him, also known as Galois field, such a domain as GF (p) and GF (PQ), the computer's P

each process directory that allow the application to simply understand the process's memory space, file description list characters, symbolic links to files on disk, and other system information. The LSOF program uses this information and other information about the internal state of the kernel to produce its output. So lsof can display information such as the file descriptor of the process and the associated filename. That is, we can find information about the file by accessing the file descri

) Select, copy, or find the word where the cursor is locatedIn vim, use IW or AW to represent a word, which is slightly different, and a indicates the spaces that are included before the word:Select the word where the cursor is located: Viw (v enters visual mode, then IW)The word where the cursor is copied: Y (a) W () indicates orDelete the word that is located in the cursor: D (a) WFind the word where the cursor is located: * Look down, #往上查找 Word movement:W W move to the beginnin

= 8053.06368About 8K processes, support 2W people at the same time access should be no problem (can guarantee that 8 k people access quickly, others may need to wait 1, 2 seconds to connect, and once the connection will be very smooth)MaxClients that control the maximum number of connections, so you can try to configure:Startservers 5Minspareservers 5Maxspareservers 10Serverlimit 5500MaxClients 5000Maxrequestsperchild 100Note that the default maximum