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The 15th chapter of PostgreSQL replication works with Walbouncer

the slave directory:$ mkdir.. /slave/baseIn the next step, all the required databases can be replicated. At this time, the following is the case on the sample master:[Email protected] base]$ ls-lTotal 72DRWX------2 HS HS 8192 FEB 24 11:53 1DRWX------2 HS HS 8192 FEB 24 11:52 13051DRWX------2 HS HS 8192 FEB 25 11:49 13056DRWX------2 HS HS

Optimize your mysql by viewing mysql configuration parameters and status

= defaults to 100 mysql> show processlist; mysql> show full processlist ;---------------------------------------- -------- Max_open_files is determined by the open_files_limit parameter. The maximum number of files opened by mysql is affected by two parameters: the maximum number of files opened by the system (ulimit-n) and open_files_limit. Increase the value of max_open_files ----------------------------------------------------------- in/etc/my. cnf is added to open_files_limit =

JVM tuning summary, jvm Tuning

during garbage collection. Can be used together with the aboveOutput Format:Total time for which application threads were stopped: 0.0468229 seconds -XX: PrintHeapAtGC: Print detailed stack information before and after GCOutput Format:34.702: [GC {Heap before gc invocations = 7:Def new generation total 55296 K, used 52568 K [0x1ebd0000, 0x227d0000, 0x227d0000)Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000)From space 6144 K, 55% used[0x221d0000, 0x22527e10, 0x227d0000)To space

Uncle Osama's Voice synthesis 1

played , so the Sample_data event is immediately triggered . So we're going to add a listener function : function Onsampledata (se:sampledataevent): void{} Next add some sound data to this sound object to play sampledataevent there is a binary data" property bytearray.float method -1.0 to 1.0 Span lang= "en-us" xml:lang= "en-us". At this point the binary variable is set to each float value is commonly said sample 2048 and 8192.

JVM tuning Summary-XMS-xmx-xmn-XSS

: + printgcapplicationstoppedtime: Print the time when the program is suspended during garbage collection. Can be used together with the aboveOutput Format:Total time for which application threads were stopped: 0.0468229 seconds -XX: printheapatgc: Print detailed stack information before and after GCOutput Format:34.702: [GC {heap before GC invocations = 7:Def New Generation total 55296 K, used 52568 K [0x1ebd0000, 0x227d0000, 0x227d0000) Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce43

Turn: JVM Tuning Parameter Summary

[0x221d0000, 0x22527e10, 0x227d0000)To space 6144 K, 0% used [0x21bd0000, 0x21bd0000, 0x221d0000)Tenured generation total 69632 K, used 2696 K [0x227d0000, 0x26bd0000, 0x26bd0000)The space 69632 K, 3% used[0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)Compacting perm Gen total 8192 K, used 2898 K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192 K, 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)

MIDI file format Analysis

slide. The music scope of the slide is-8192 ~ 8191, but the parameter is a positive number. For example, to set it to 0, it should be 0-(-8192) = 8192, which is the parameter. The 7-bit double byte of 8192 is represented as "8192 mod 128 = 00 h;

Oracle 10g R2 RAC Install On OEL5 x86_64

660/dev/raw [0-9]">/etc/rc. local Dd if =/dev/zero of =/dev/raw/raw1 bs = 8192 k count = 3000Dd if =/dev/zero of =/dev/raw/raw2 bs = 8192 k count = 3000Dd if =/dev/zero of =/dev/raw/raw3 bs = 8192 k count = 1200Dd if =/dev/zero of =/dev/raw/raw4 bs = 8192 k count = 1200Dd if =/dev/zero of =/dev/raw/raw5 bs =

View GC information in Tomcat

collection. Can be used together with the aboveOutput Format:Total time for which application threads were stopped: 0.0468229 seconds -XX: printheapatgc: Print detailed stack information before and after GCOutput Format:34.702: [GC {heap before GC invocations = 7:Def New Generation total 55296 K, used 52568 K [0x1ebd0000, 0x227d0000, 0x227d0000)Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000)From space 6144 K, 55% used[0x221d0000, 0x22527e10, 0x227d0000)To space 6144 K, 0% us

Implementation of Orangepi Zero register access and GPIO control in Python environment

program, obviously, This length must be long enough to map the entire GPIO module's register address, in order to normally access the GPIO register in the user program, which is set to two page size, that is 8192 bytes (0x01c20000 ~ 0x01c21fff), from Datasheet view, This address space contains all the registers of the CCU, PIO, TIMER, OWA, PWM, KEYADC modules.After the mapping, we can get an object of the Mmap class, using this object, we can read an

Analysis of Linux memory layout based on mini2440

connected to different pins on the CPU bus.Read operation of 1.1.3 SDRAMSDRAM to read operations, the address line is sent to the address to read the data, through the knowledge of the previous, the address is divided into 3 parts, line address, column address, L-bank chip selection signal. The chip selection (L-bank) operation and the efficient operation of the line can be done at the same time.At the same time as CS and L-bank are addressed, RAS (Nsras line address Select communication number

Python urllib urlretrieve Function parsing

. fromSix.movesImportUrllibdefSchedule (A, B, c):"""A: Data blocks that have already been downloadedB: Size of the data blockC: The size of the remote file """Per= 100.0*float(A*b/float(c)ifPer> -: Per= - Print("a"APrint("B", b)Print("C"CPrint(' {:. 2f}% '.format(per)) Url= ' Https://avatars1.githubusercontent.com/u/14261323?s=400u=150449ce27748c3b23b5175f8c8342c918ae6aa8 v=4 'Local= ' Mylogo.png 'FileName, _=Urllib.request.urlretrieve (URL, local, Schedule)# (' Mylogo.png ', Print

Why Subtraction is the most difficult mathematical operation in product design?

Simplicity is not simple. What it needs is persistence! Because of its simplicity, we have designed a Nest thermostat, a treadmill, and a digital video recorder. Because of its simplicity, apple, on the verge of bankruptcy, is thriving. Because of its simplicity, you have used wangfei. Fisher's space pens, Swiss Army k

Linux lower Port close_wait too much __linux

larger, you do not need to modify the value; If the value of the open files parameter is less than 4096 (the default is 1024), modify the open files parameter value to 8192 by using the following method: Ulimit-a 1. Use root login, modify file/etc/security/limits.conf vi/etc/security/limits.conf add Xxx-nofile 8192 XXX is a user, if you want to replace all users with *, set the value of the hardware config

Using the Winsock control to realize network point-to-point communication

takes up about 60MB of RAM! Dizzy, what's going on? Is there a mistake? To reorganize the idea: Select files, send commands, when received return confirmation message, open file, read ... Read??? No, I read the whole file into memory, no wonder (in fact, this error will not happen because Windows has virtual memory!). But it is true, to read the entire file into memory and then send out, a bit to make the system difficult ah! To optimize the optimization. Go back to the server code for optimiz

Based on s3c2440a + SDRAM (k4m000063)

the bank and the Bit Width of an SDRAM chip. The bit width indicates each transmission cycle (here it refers to a cycle of the clock sent to the CLK end) the amount of data transmitted (16 bits ). (3) Amount of SDRAM The amount of SDRAM is the number of storage units. The formula is as follows: Amount of SDRAM = number of banks * (number of rows * Number of columns) Here, the number of banks is 4, while the number of rows and the number of columns are described in The number of rows can be a0

[Ext4] 05 disk Layout

block can store. You can use blk_size/inode_size to obtain inode_block; Root @ ubuntu:/mnt/ext4 # debugfs/dev/sdc Debugfs 1.42 (29-Nov-2011) Debugfs: stats Filesystem volume name: Last mounted on:/mnt/ext4 Filesystem UUID: 883c6632-e61d-4420-b309-0695f321cf9d Filesystem magic number: 0xEF53 ... Inode count: 327680 ... Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 ... First inode: 11 Inode size: 256 Required extra isiz

Install linux configurations using pxehttp

= dgram Protocol = udp Wait = yes User = root Server =/usr/sbin/in. tftpd Server_args =-u nobody-s/tftpboot Per_source = 11 CPIs = 100 2 Flags = IPv4 } Copy/image/pxeboot/initr. img, vmlinux, and isolinux/*. msg to the/tftpboot directory on the first installation CD of LINUX. # Cd/tftpboot # Mkdir pxelinux. cfg # Vi default and save it to the created pxelinux. cfg directory ======================= ============= Default linux Prompt 1 Timeout 600 Display boot. msg F1 boot. msg F2 options. msg F3

Paip. mysql Performance Test report homeright_MySQL

Paip. mysql Performance Test report homeright bitsCN.com Paip. mysql Performance Test report home right Environment: xpsp3, mysql5.6.12 Hard disk information: Serial: WD-WMAV29469153 Capacity: 160.0 gB (149.0 GB) Cache size: 8192 KB Large File Speed 8192 KB 96839 KB/second WR speed Random speed IOPS 512 bytes 60 IOPS 16 Ms 0.029 MB/second 4 KB 56 IOPS 17 Ms 0.220 MB/second 64 KB 58 IOPS 17 Ms 3.637 MB/sec

COCOS2DX in-game memory optimization

, I'll first check if the sprite frame is in the cache, and if it doesn't, load it. You'll see how it's done in the back.Understand when and where to clear the cacheDo not randomly clear the cache, or you can try to free up some memory and remove unused textures. That's not a good code design. Sometimes, it even increases the number of loads and causes "intermittent memory to soar" multiple times. Analyze the memory usage of your program, see what's Inside the memory, and what should be erased,

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