Mining and wire burning
1. bitcoin mining is a kind of computer used to earn bitcoin. This kind of computer generally has professional mining chips and works in the way of burning graphics card
, which consumes a lot of power
one of the ways to get bitcoin is that users download software from personal computers and then run specific algorithms to communicate with remote servers
simply put, it is a box like a computer host. Plug in the Internet cable and power supply, and configure the account information
to automatically "mine" - generate bitcoin
2. The popular digital currencies in 2013 are bitcoin, Leyte coin, zeta coin, pennies (Internet), invisible gold bar, red coin, pole
point coin, barbecue coin and prime currency. At present, hundreds of digital currencies are issued all over the world
the price of bitcoin mining machine ranges from two or three hundred yuan to 200000 yuan
3. From 2011 to 2013, high configuration bitcoin & quot; Mining machine & quot; From 10000 yuan to 300000 yuan, but the performance is better than before
a lot
4. According to instry insiders, the old machine can only dig 1 bitcoin in 100 days, but now (2013) machine can dig 3.5 bitcoins in 100 days
according to the miner information published by the domestic assembly team, a miner with the lowest configuration at the price of 3000 yuan can be returned in more than 30 days according to the bitcoin mining speed
degrees
The machine with mining speed of 10G / s can dig about 0.03 bitcoins 24 hours a day, while the machine with mining speed of 13g / s can dig about 0.035 bitcoins 24 hours a day according to the full network computing power and difficulty of 2013power consumption of bitcoin mining machine:
according to digiconomist's bitcoin energy consumption index, as of Monday (November 20), the current global annual power consumption generated by "mining" for
bitcoin is expected to be 29.05twh. TWH is one kilowatt hour, equivalent to one billion
power consumption per 100 S4 bitcoin mining machines is 900W per hour, and power consumption per S4 bitcoin mining machine is 90W per hour
Taking t2t-30t as an example, the calculation force of t2t-30t is 30t, and the power consumption is 2200W, that is, 2.2kW. The power consumption of a single miner in 24-hour operation is 2.2kW * 24 = 52.8kwh, and the electricity charge is once calculated as 0.56rmb, the daily power consumption cost of a single miner is 52.8kw * 0.56 = 29.57rmb
to "mine" with bitcoin mining machine, if the graphics card is fully loaded for a long time, the power consumption will be quite high, and the electricity bill will be higher and higher. There are many professional mines at home and abroad in areas with extremely low electricity charges, such as hydropower stations, while more users can only mine at home or in ordinary mines, so the electricity charges are not cheap. Even some people in a residential area in Yunnan carried out crazy mining, which led to a large area trip of the residential area, and the transformer was burned
extended data
mining principle of bitcoin mining machine:
bitcoin mining and node software mainly initiates zero knowledge proof and verification transactions through point-to-point network, digital signature and interactive proof system. Each network node carries out broadcast transactions to the network. After these broadcast transactions are verified by miners (computers on the network), miners can use their own work proof results to express confirmation. The confirmed transactions will be packaged into data blocks, and the data blocks will form a continuous data block chain
every node of bitcoin will collect all the unconfirmed transactions and gather them into a data block. The miner node will add a random adjustment number and calculate the sha256 hash value of the previous data block. The mining node keeps trying again and again until the random adjustment number it finds makes the hash value lower than a specific target
if you want to talk about what is the investment proct with the highest return on investment, it must be bitcoin in recent years. The price of bitcoin has doubled dozens of times, which makes many people excited and devote themselves to mining. But as we all know, bitcoin mining is not simple. It requires a large number of computers with high configuration to work continuously, and the electricity consumption can also be imagined. Recently, Inner Mongolia asked to close all virtual currency mining projects before the end of April, and prohibited new virtual currency mining projects. Recently, the Inner Mongolia development and Reform Commission issued "several safeguard measures to ensure the completion of the" fourteenth five year plan "energy consumption double control target tasks (Draft)", which clearly proposed to comprehensively clean up and shut down the virtual currency mining projects, and withdraw them by the end of April 2021
1. CPU is mainly optimized for serial instructions, while GPU is optimized for massively parallel operations
2. Modern multi-core CPU aims at instruction set parallelism (ILP) and task parallelism (TLP), while GPU is data parallelism (DLP)
3. GPU often has a larger bandwidth of memory, that is, the so-called video memory, so it will also have good performance in high throughput applications
the CPU needs strong generality to deal with various data types, and at the same time, it also needs logical judgment, and it will introce a lot of branch jump and interrupt processing. All these make the internal structure of CPU extremely complex. GPU is faced with highly unified, interdependent large-scale data and pure computing environment without interruption. GPU uses a large number of computing units and ultra long pipeline, but it only has very simple control logic and saves cache. The CPU not only occupies a lot of space by cache, but also has complex control logic and many optimization circuits. So unlike CPU, GPU is good at large-scale concurrent computing, which is suitable for password cracking
in short, CPU is a general-purpose operation. In short, it means brainless calculation and violent calculation. Whether it's 100 children sharing apples or simulating the earth, it can be decomposed into the most basic calculation of 1 + 1 = 2. GPU is specially designed to deal with high-order mathematical algorithms, such as calculating the relative positions of light source, object, viewpoint and shadow, which requires trigonometric functions to be piled up. The bitcoin digger uses SHA-256, a secure hash function invented by the US National Security Agency, which is generally used for password encryption and decryption. This algorithm can perform a large number of 32-bit integer right-rotate operations, which is very suitable for GPU which is good at large-scale concurrent computing and password cracking.
places like Tiger Hill
ancient town (Zhouzhuang, Tongli)
Wenyi Street: Pingjiang road.. When shopping (before watching). (Stone Road)
food: Xiangxin snacks, tangjiaxiang chicken chops, pan Yulin sugar porridge stand... Are all classics
the cheese of Sufei's family in Pingjiang road is good
there are a lot of snacks, but they need to be carefully searched....
200 sets are not too many
if students have outstanding performance or contribution in school, they are more likely to win "special awards for services" in addition to winning scores for their own college. On the contrary, if you violate the school rules, you will not only be dected points, but also receive labor service; There are many forms of labor service (but it must not be ing), such as not using magic to clean up, or assisting Hagrid to patrol the forbidden forest, etc<
School Badge:
the school motto at the top is "never tease a sleeping dragon."
the school name "Hogwarts" is actually the name of a flower. "The inspiration for writing comes from all over the world, and sometimes I don't realize where I got it," JKR said. A friend of mine in London recently asked me if I remember when we first met Hogwarts. I didn't know what she was talking about until she reminded me that we went to Kew Gardens that day and saw the lilies. Their names were Hogwarts. I saw them seven years ago, and they roll in my memory. When Hogwarts came to me as the name of the school, I didn't know where the idea came from<
School Profile:
- headmaster: Albus Dumbledore
- staff: about 20 people
- number of students: about 1000 people (but according to the description of the book, the school has about 300 students)
Student Assessment:
students only take the exam once a year, and they can be upgraded if they pass the exam. The fifth grade students need to accept the examination of "o.w.ls - ordinarywizard levels"; The seventh graders must pass the n.e.w.t. - nastily exercising wizard tests before they can graate<
enrollment criteria:
- children over 11 years old, regardless of gender
- have magic talent, whether they are from magic family or Muggle family
if you meet the above qualifications, you will receive the college's admission notice letter in July. Remember, it's not an ordinary email, it's an owl email sent by owl. Congratulations on receiving the notice! You will take the "Hogwarts Express" to Hogwarts castle, where you will start a wonderful and challenging magic journey for seven years<
the four colleges of Hogwarts
western philosophy comes from Greece. Thales, who was born in the 620s BC and died in the 540S, is regarded as one of the Seven Sages in Greece. He thinks that water is the mother of all things. In the middle of the 5th century B.C., an active thinker, allaximini believed that wind was the component of all things. Heraclitus, one of the founders of dialectics, who was born in the 530S B.C. and died in the 470s B.C., believed that everything was born of fire. In the 4th century B.C., a doctor and philosopher, Androcles synthesized the views of his former philosophers. Besides water, wind and fire, he added earth to make up the four elements of all matter
Gryffindor stands for fire, Ravenclaw stands for wind, hutchpatch stands for earth and Slytherin stands for water. When the four elements exist at the same time, they form a complete system. But as we all know, they are also independent<
Gryffindor
Color: red and gold
Dean: Professor McGonagall
logo: Lion
founder: Godric & Chen 8226; Gryffindor
College Students: Harry Potter, Hermione Granger, Ron Weasley, Colin Creevey, Dennis Creevey, Seymour Finnegan, Dean Thomas, Pavati petil, lavender brown, Neville Longbottom, Ginny Weasley, Katie bell Natalie MacDonald et al.
graates: (before the sixth part) Fred Weasley, George Weasley, Lee Jordan, Elia spinnet, Angelina Johnson, Percy Weasley, Oliver wood, Bill Weasley, Charlie Weasley, Molly Weasley, Arthur Weasley, Albus Dumbledore, Lily Porter, James Porter Remus lupin, Peter Pettigrew, Sirius Black, Mileva McGonagall, etc.
Ravenclaw
Color: blue and bronze Dean: Professor flavey
college logo: Eagle
founder: royna & Chen 8226; Ravenclaw
College Students: Terry bout, Stuart Ackley, Ola Quelch, padmapatil, Lisa Dupin, Luna Lovegood, Mandy brogher, Qiu Zhang, Marietta ackermar
graates: Penelo kriwatt Qiu · Zhang
hutchpatch
Color: yellow and black
Dean: Professor sproot
logo: badger
founder: Helga & Chen 8226; Hechpatch
College Student: Ernie McMillan, Justin finlieri, Susan burns, Hannah ABO
graate:
Slytherin
Color: green and silver
Dean: Professor Snape
logo: snake
founder: Salazar & 8226; Slytherin