kilobyte megabyte

I started reading programming on Saturday and finished reading the first article. But now I write my notes. The first question is actually very simple. But it is impossible for someone who has learned data structures and sorting algorithms to come up with such a method, on the contrary, it is more likely to be thought of by a person who has never learned sorting. The problem is as follows: Input: a file containing at most n positive integers, each less than n, where n = 107. it is a fatal error

Write a file in WindowsProgramA process fork generates about 2000 threads and then exits abnormally. Why? This problem occurs because in Windows 32-bit system, a process can use a maximum of 2 GB of virtual memory, and the default thread stack stacksize of a thread is 1024 K (1 m ), in this way, when the number of threads approaches 2000, 2000*1024 K = 2G (approximately), memory resources are equivalent to depletion. Msdn Original: "The number of threads a process can create is limited

Iostat command ExplanationThe iostat is used to output CPU and disk input and output, partition, Network File system NFS-related statistics. The Iostat command monitors the input/output status of system devices and generates reports to modify the system configuration for better performance based on statistical reporting.Command format:Iostat [-c] [-d] [-n] [-n] [-h] [-K |-m] [-t] [-v] [-X] [-z] [device [...] | ALL] [-p [device [,...] | all] [interval [count]]Iostat can produce three types of rep

Linux boot Start program detailedWe assume that you are already familiar with the boot process of other operating systems, and understand the self-test boot steps of the hardware, starting with the boot loader for the Linux operating system (usually lilo for personal computers) and introducing the Linux boot steps.Load KernelAfter Lilo starts, if you choose Linux as the boot-ready operating system, the first thing to be loaded is the kernel. Keep in mind that there are no operating systems in th

is a game or high-definition are very necessary. For the current mainstream, whether it is telecommunications or netcom broadband, the general 4M speed can be achieved how much? The formula for calculating 4M broadband is: 4*1024/8 = 512k/s, that is, the theory of the 4M broadband speed download speeds can reach the highest 512k/s, But in reality because the environmental impact is not possible to achieve this speed, then how to judge it? The most common and easiest to judge is to use some of

that the eth0 outlet has 100mbit/s bandwidth, assigned to WWW, e-mail and Telnet three data traffic, which is allocated to the WWW bandwidth of 40mbit/s, the bandwidth allocated to the email is 40mbit/s, the bandwidth allocated to Telnet is 20Mbit SIt is important to note that the following abbreviations are used in the TC to indicate the appropriate bandwidth:Kbps kiiobytes per second, or "kilobytes per second;Mbps megabytes per second, or "megabyte

Linux boot Start program detailedWe assume that you are already familiar with the boot process of other operating systems, and understand the self-test boot steps of the hardware, starting with the boot loader for the Linux operating system (usually lilo for personal computers) and introducing the Linux boot steps.Load KernelAfter Lilo starts, if you choose Linux as the boot-ready operating system, the first thing to be loaded is the kernel. Keep in mind that there are no operating systems in th

of the system's maximum pathname (defined in the/usr/include/sys/limits.h file).If you do not specify an input file or if you specify-(minus) The file name, the split command reads the file from the standard input.SignNote: the-B and-L flags are mutually exclusive.-a suffixlength Specifies the number of letters used to form the suffix portion of the output name file. Number of letters determines the number of possible combinations of output file names. The default is two letters.-B divides the

doubled because the code page and shared library are single. The free and PS commands are useful for estimating memory requirements. The first step of the estimate plus some security amount. Because estimating the size of a program is probably wrong because you may have forgotten some of the programs you want to run and make sure you have some extra space. There should be a few MB. (Allocating too much space is better than allocating too little, but not excessive, because not using the swap s

is cumbersome, and the global variable Local_school is a Threadlocal object, each threadIt can read and write student properties, but it does not affect each other. You can think of Local_school as a global variable, and each property, such as Local_school.student, is a lineProcess local variables, can read and write without interfering with each other, do not need to manage the lock problem, threadlocal internal processing.The most common place for threadlocal is to bind a database connection,

When we mention the software, we all think of the two old compressed software and the powerful features of WinZip and WinRAR. But are you going to be worried because they spend dozens of minutes compressing or decompressing a hundreds of-megabyte file? If you introduce a compression speed is WinZip and WinRAR 3~5 times of software, smart you will not hesitate to choose it one by one ghost Expforer. Ghost Explorer is a Gho mirrored file editor in Nort

process needs to be put into the boot disk. -fatlimit Limit NT FAT16 partitions to 2G. This parameter is useful when replicating windowsnt partitions and not using the FAT16 of the 64k/cluster. -span volume parameters. Another backup package that prompts for replication to another partition when there is insufficient space. -auto when the volume copy is not prompted automatically give a filename to continue execution. -crcignore ignore the Crcerror in the backup package. Do not use this paramet

larger the more likely to be killed, this value because of the shift operation, so the impact is relatively large. Here I write a small program to experiment: #define MEGABYTE 1024*1024*1024 #include The above program first requests a 1G of memory space, then 100M for the unit, fill the memory space. In a 2G memory, 400M swap space on the machine running 3 above the process. Let's look at the results of the operation: Test1, Test2

FreeBSD and then download. 1.4 Copy the wireless card driver files from Windows It is mainly two documents: W22n51.sys and W22n51.inf 2, install the kernel 2.1 Boot-only mirroring of FreeBSD guided by Isoemu That's the twenty or thirty-megabyte mirror. Why not direct with DISC1. I have tried, with DISC1 guide, will crash. Perhaps the mirror is too big, the specific reason is not clear. Whatever it is, boot with boot-only mirroring. 2.2 Start in

current reality is that most mobile apps come from third party developers. The opening of the device sensor application interface and the presence of the developer community are the only factors that increase the number of applications (the number of applications per phone may be installed from 50 to 100). ” So what's going to happen in the near future? Five major breakthroughs expected (between 2016 and 2018) In response, Talluri made the following predictions: Wireless network densification (

can also be calculated that if sampled by 4:4:4, the amount of data in the digital video is 40 megabytes per second. A 10-second digital video consumes 270 gigabytes of storage space at a data rate of 27 megabytes per second. According to this data rate, a 680 megabyte CD-ROM can only record about 25 seconds of digital video data, and even if the current high-speed optical drive, its data transmission rate is far less than 27 megabytes per second tra

the same time, some of the data originates from the PC, and in addition, a lot of log data is generated during the system operation. (1) data collected by the terminal ① trajectory data: to include the company ID, user ID, latitude and longitude, address, positioning time, positioning type information such as a data sample, the default is collected once, if the enterprise employees default working time 8 hours, each employee number of 2 080 per day, assuming the number of users is 10 000, then

SIZE is 1 megabyte. All extents of temporary tablespaces was of uniform size, so this keyword was optional for a temporary tablespace. However, must specify, UNIFORM in order to specify SIZE . You cannot specify, UNIFORM for an undo tablespace. If You don't specify AUTOALLOCATE or, then UNIFORM the UNIFORM default was for temporary tablespaces AUTOALLOCATE Types of tablespaces.If you don't specify extent_management_clause the, then Ora

/** Create tablespace (as System identity)*/CREATE tablespace spc_myself--Table space Name (spc_myself)DataFile ' E:\datafiles\MYSELF. DBF '--datafile specifies one or more data files for the tablespace, ' path and name of the data file 'Size 30m--file sizes, M-megabyte byte sizeAutoextend off--prohibit automatic extension of data files/** Delete Table space*/DROP tablespace spc_myself/** Create user*/CREATE User one--username (one)Identified by orcl-

DBCC Shrinkfile shrinks the data at the district level, and deletes the areas that are not in use. But there will be a lot of empty pages distributed in the area, resulting in the use of the zone, so the area is not deleted.To delete, the method is to rebuild the clustered index and organize the page data.Note: The page is the most basic unit of the SQL Server data store, and the page size is 8KB.Each zone consists of 8 pages, which means that there are 128 pages, 16 extents per