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Description: This chat room is based on node. JS implements the basic real-time communication functionality. Prior to this, there is no knowledge of node. js and MongoDB, but by flipping through blogs, you have basically achieved the desired results. Technology, should not be behind closed doors, but learn to share the summary in order to progress. Therefore, I want to record my learning experience. Do not like to spray. Technology selection:Database: MongoDBReal-time communication: Socket.ioSe

, buffer/cached is quickly used. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine. so per second the virtual memory is written to the size of the disk, if this value is greater than 0, ibid.The number of blocks received per second by BI block devices, where the block device refers to all the di

First, install the hard drive to the physical machine. SlightlySecond, check whether the hard disk is installed correctly.Use the "fdisk-l" command to view the hard drive code.You can see that I have added a new hard drive ID as SDB.Third, partition the hard disk.1, when the hard drive is less than or equal to 2T, you can use Fdisk.[[Email protected] ~] #fdisk/dev/sdb1. Check the help.Input: M2. Create a new partition.Input: N3. Creating Logical partitionsInput: P4. Enter the partition number an

execution, When the program uses memory, buffer/cached is quickly used. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine. so per second the virtual memory is written to the size of the disk, if this value is greater than 0, ibid.The number of blocks received per second by BI block devices, whe

First, the file system underLinux 1. Basic file System 1.1 ext1.2 ext2 2. log File system 3. extended Linux log file system 3.1 ext33.2 Ext43.3 JFS3.4 Reiser 3.5 XFS second, the operation of the file systemcreate partition using:fdisk command 1 , you can use fdiskwhen the hard drive is less than or equal to 2T . # Fdisk/dev/sdb 1, view Help. input: M 2, new partition. input: N 3, create logical partition input: P 4, enter partition number and specify partition size follow the pro

0Recommended in Linux you sometimes need to debug USB interface serial message, but no similar to Windows Hound tool, feel more pain, in fact, the Linux kernel provides usbmon This tool, can collect serial information.1. Prepare:Hook up the Debugfs (this can be enabled in the kernel configuration) and load the Usbmon module (if Usbmon is compiled into a module). If Usbmon is compiled into the kernel, the second step can be omitted# mount-t Debugfs None_debugs/sys/kernel/debug# modprobe Usbmon#Ma

file and directory cache, is to improve the performance of the program execution, when the program uses memory, Buffer/cached will be used very quickly. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine.So per second The virtual memory is written to the size of the disk, if this value is greate

second, if the value is greater than 0, indicates that the physical memory is not enough or memory leaks, to find the consumption of memory process resolved. My machine has plenty of memory and everything is fine. So: the size of virtual memory written to disk per second, if this value is greater than 0, ibid. bi: The number of blocks received per second by the block device, where the block device refers to all the disks and other block devices on the system, the default block size is 1024b

spare part of the physical memory to do the file and directory cache, is to improve the performance of the program execution, When the program uses memory, buffer/cached is quickly used. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine. so per second the virtual memory is written to the size o

directory cache, is to improve the performance of the program execution, When the program uses memory, buffer/cached is quickly used. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine. so per second the virtual memory is written to the size of the disk, if this value is greater than 0, ibid.The

',' to','a',' to',' to']3t = A.count (' to')#number of queries to appear4 Print(t)5.2 ExtendThe Extend method can append multiple values from another sequence at the end of the list:1 The extend method can append multiple values from another sequence at the end of the list at once2A = ['1','2','3']3b = ['4','5','6']4A.extend (b)#Add the B list to the A list5 Print(a) Extend method modifies the expanded list, and the original connection operation (+)

The two-dimensional graph in MATLAB has a function to draw multiple patterns in the same coordinates. Plot (X1,y1,x2,y2 ...) ---------according to Vector x1,y1 and vector x2.y2 ... The equal vectors draw multiple graphs in the same coordinates. For example in the same window to draw X=sin (T), X=sin (2t), X=sin (3t), in the definition field [0,π], within the graphics. Program is: T=linspace (0,pi,36); X1=sin (t); X2=sin (2*t); X3=sin (3*t); Pl

spare part of the physical memory to do the file and directory cache, is to improve the performance of the program execution, When the program uses memory, buffer/cached is quickly used. )Si reads the size of the virtual memory from disk every second, if this value is greater than 0, it means that the physical memory is not enough or the memory leaks, to find out the memory process. My machine has plenty of memory and everything is fine. so per second the virtual memory is written to the size o

devices on the system, the default block size is 1024byte, I have no IO operation on this machine, so it has been 0, but I have been working on copying large amounts of data (2-3T) The machine has seen can reach 140000/s, disk write speed of almost 140M per second The number of blocks that Bo block devices send per second, such as when we read a file, the Bo will be greater than 0. Bi and Bo are generally close to 0, otherwi

space, will occupy a 2T of hard disk, if this time to 100 users how to do? If you use LVM to solve this problem, we can add a 3T hard drive, and then add this hard drive to the volume group to enlarge the volume group size, and then adjust the size of the logical volume where/home is located. LVM can be used with both MBR and GPT. The above knowledge points are validated by the following automatic partitioning strategy for the Ubuntu 14.04 installat

cluster, currently able to do in more than 10 minutes to a few 10 minutes to repair 2 to 3T of data) Coping with the growth of capacity Acceptable speed of access A reasonable and efficient cache Seven cattle on the network using a conventional gigabit LAN, this is taking into account its maturity and cost, between the cabinet can not guarantee any two points at any time are thousand trillion, or even can not guarantee the full unicom, and the sp

specific function of the thing. ?? modifier return value type Method Name ( parameter list ) {?}}Here's a piece of code to show how a class is defined:/* Define a class to describe the phone this thing *///define a mobile phone class Public?class? phone{????????? Define the properties of your phone: brand, color, size, etc.????????? String?brand;????????? String?color;????????? Double?size;}/* Define the test class for the phone class to test the function in the phone class *///define the test

improve the performance of program execution, When the program is using memory, the buffer/cached will be used very quickly. ) si per second the size of the virtual memory from disk, if this value is greater than 0, indicates that the physical memory is not enough or memory leaks, to find the memory process to solve the loss. My machine has plenty of memory and everything is fine. so per second virtual memory is written to disk size, if this value is greater than 0, ditto. The number of blo