treehouse tracks

information about standard errors. -F tracks the child processes that are generated by the fork call. -FF If you provide-o filename, the trace results for all processes are output to the corresponding filename.pid, and the PID is the process number of each process. -F attempts to trace vfork calls. At-F, vfork is not tracked. -h outputs a brief help message. The-I output system calls the entry pointer. -Q suppresses the output of messages

than mechanical hard disk;3. The Linux system uses the physical memory that the system does not use as the buffer or buffers, buffer is the write buffer, Synca writes the buffer data to the disk, and the cache is the buffer to read the data.4, mechanical hard disk read and write speed is too slow, so in the portal architecture site, read and write to use cache buffering technology.5. Internal disk structure(1) A disk has multiple platters, each with two discs and two heads (head) per disc.(2) o

disk.Because the hard disk is a high-precision device and the dust is its enemy, it must be completely sealed. 2. Working Principle of the hard disk Hard Disks are logically divided into tracks, cylinders, and sectors.Each disk has a read/write head on each side of the hard disk. The head is close to the contact surface of the spindle, that is, the place with the smallest wire speed. It is a special area that does not store any data. It is calle

CD You have a long drive by car ahead. you have a tape recorder, but unfortunately your best music is on CDs. you need to have it on tapes so the problem to solve is: you have a tapeNMinutes long. How to choose tracks from CD to get most out of tape space and have as short unused space as possible. Assumptions: Number of tracks on the CD. does not exceed 20no track is longer NMinutestracks do

You have a long drive by car ahead. you have a tape recorder, but unfortunately your best music is on CDs. you need to have it on tapes so the problem to solve is: you have a tape N minutes long. how to choose tracks from CD to get most out of tape space and have as short unused space as possible. Assumptions: Number of tracks on the CD. does not exceed 20No track is longer than N minutesTracks do not repe

The disc of the hard disk is made from the surface of the disc that attaches the magnetic powder to the aluminum alloy (the new material also has to use glass), which is divided into concentric circles called "tracks". On each concentric track there is an infinite number of tiny magnets that represent the 0 and 1 states respectively. When these small magnets are affected by the magnetic force from the head, the direction of the Irresolute column is ch

structure of the hard diskWhen the system is running, the hard drive data passes through the channel to memory and then the CPU executes.The hard drive can store data permanently.The external drive has a power supply interface and a data interface.The hard drive is connected to the motherboard via a data interface.The memory is also plugged into the motherboard, which is connected to the hard drive by the motherboard's hard drive interface through the motherboard chip and the motherboard intern

UVA 624 CDYou had a long drive by car ahead. You had a tape recorder, but the unfortunately your best music was on CDs. You need to has it on tapes so the problem to solve is:you has a tape N minutes long. How to choose tracks from CD to get the most out of tape space and has as short unused space as possible.Assumptions:Program should find the set of tracks which fills the tape best and print it in the sam

, which is a video of a format (such as MP4).Each video file, actually contains a variety of tracks (track), the image of the track is what we see, the audio track is the sound we hear, and the subtitle track is the display of subtitles. If the video files are not transferred, the resources of these tracks (resource) can actually be synthesized into the container without being reused. It is because of the t

these audio tracks of different precision will sound different after they are eventually burned to a 16-bit/44.1 kHz music CD. The hardware and software materials we used in the experiment were: We invited some musicians (two classical guitar players, one violin player and one female singer) to brilliant studios in San Francisco ). We use the u87 and C 460 microphones from the akg company to perform recording. After the signal passes through a range

one head controller. The head Controller is responsible for the movement of each head. The head can be moved along the radius of the disk. In fact, it is a diagonal cutting, each head must be coaxial at the same time, that is, from the top down, all heads overlap at any time. Due to the development of technology, there is already an independent multi-head technology. This situation is not considered here. The disk runs at a high speed with thousands of turns per minute to tens of thousands, so

executing in a tablet probably the view will use // 2 or more columns. // Column layout definitions are optional. // However, we recommend that scopes define layouts for the best visual appearance. // Single column layout layout1col.add_column( { "image", "header", "summary", "tracks" }); // Two column layout layout2col.add_column( { "image" }); layout2col.add_column( { "header", "summary", "

The latest version of storm audio and video is used in the following discussions. 5.03.24Is there anything else that cannot be played in the well-known Media Player classic? Yes, I have encountered this situation.I have a test album with three audio tracks, 6-channel AC3 (0x80), 5-channel DTS (0x89 ), 2-channel AC3 (0x82) is the companion song. When playing the video in a DVD drive, everything works normally, and all three audio

, depending on the type of the variable, or by the increment or decrement of the pointer.Q: And then what?A: If the compiler sees you adding 2 to a pointer to an int array, it will multiply by 2 by 4 (int length) and then add 8 to the address.Q: Does the C language use the sizeof operator when adjusting pointer arithmetic operations?A: In essence, the result of the sizeof operator is also determined at compile time, and the same length will be used for various data types, sizeof and pointer arit

1. Introduction Strace is commonly used to track system calls and received signals when a process executes. Strace can track system calls generated by a process, including parameters, return values, and time spent executing. 2. Parameter -C counts the time, times, and number of errors that each system call performs.-D Output strace debugging information about standard errors.-F tracks the subprocess generated by the fork call.-FF If you provide-o fil

once. $ git commit-m "understand how Stage" [master 27c9860] Understand how stage works 2 files changed, 675 in Sertions (+) Create mode 100644 LICENSE Once submitted, if you do not make any changes to the workspace, the workspace is "clean": $ git Status # on branch Master No to commit (working directory clean) Now that the version library has become so, registers has nothing: Summary Registers is a very important concept for git, understanding the registers and figuring out what a lot o

14.5 SQL SummarySo far, we have used SQL in the Python sample program and have covered many SQL foundations. In this section, we take a special look at the SQL language and review its syntax.Although there are many different database vendors, but because the SQL language is standardized, so we can be easily ported in different database systems.A relational database is composed of tables, rows, and columns. Columns typically have a type attribute, such as text, numbers, or data. When we create a

Tags: good system network htm my.cnf file operation search Technical expressionsStrace is the next generic process dynamic tracking tool for Linux that tracks system calls and received signals when the program executes. The application method is as follows (part).First of all, simply say its use parameters, Strace parameters include output parameters, filtering parameters, statistical parameters, tracking parameters, startup parameters and other misce

logically divided into tracks, cylinders, and sectors. Figure 3 track, cylinder, and sector Each disk has a read/write head on each side of the hard disk. Figure 4 Disk Area Division The head is close to the contact surface of the main shaft, that is, the place with the smallest wire speed. It is a special area that does not store any data. It is called the start/stop area or the landing area (landing ).Zone. In the outermost ring, the farthest place

power-zero linear transformation on $ V_ I $: $ n ^ {n_ I} = 0 $, this problem is caused by the analysis of the structure of power zero linear transformation $ N $. The simpler reason for power-zero linear transformation is that it can be expressed as the straight sum of the shift operator, while the structure of the shift operator is very simple. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ Step 2: Verify the power zero Transformation If $ N $ is a zero-power linear transfor