A computer can connect several mining machines
You can't dig in a day. It takes 2000 years
the global unified computing difficulty of bitcoin is 2621404453 (expected to change in two days). It takes more than 2000 years for a 2.5GHz CPU to work out a bitcoin
in order to make the graphics card fully loaded for a long time, the power consumption will be quite high, and the electricity bill will be higher and higher. Many professional mines at home and abroad are operated 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 in a certain residential area in Yunnan, there was a case of crazy mining, which led to a large area trip of the residential area, and the transformer was burned
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bitcoin network generates new bitcoin through "mining". In essence, the so-called "mining" is to use computers to solve a complex mathematical problem to ensure the consistency of bitcoin network distributed accounting system
bitcoin network will automatically adjust the difficulty of mathematical problems, so that the whole network can get a qualified answer about every 10 minutes. Then bitcoin network will generate a certain amount of bitcoin as block reward to reward the person who gets the answer
when bitcoin was born in 2009, block rewards were 50 bitcoins. Ten minutes after its birth, the first 50 bitcoins were generated, and the total amount of money at this time is 50. Then bitcoin grew at a rate of about 50 every 10 minutes. When the total amount reaches 10.5 million (50% of 21 million), the block reward will be halved to 25
when the total amount reaches 15.75 million (5.25 million new output, i.e. 50% of 1050), the block reward will be further halved to 12.5. The monetary system used to have no more than 10.5 million in four years, after which the total number will be permanently limited to about 21 million
all oil holes on the machine and all rotating parts should be refueled with clean sewing machine oil every 4 hours. Other oils and unclean sewing machine oil should not be used, so as not to affect the service life of the machine
(2) regular maintenance and inspection
it is necessary to keep the parts clean, regularly check whether the temperature and sound of the rotating parts are normal, and repair them immediately if any problems are found, so as to avoid damaging the machine
generally, minor overhaul is concted once a month, and cleaning and major overhaul are concted once a half year. After being put into use for a long time, it should be cleaned and overhauled first
the thickness and use speed of the sewing material should be selected within the specified range, and it should not be overloaded or over speed.
raid for short, which means "cheap and rendant disk array". Its principle is to use the array method to make disk group, with the design of data scattered arrangement, to improve the security of data. Disk array is mainly aimed at hard disk. In terms of capacity and speed, it can't keep up with the development of CPU and memory. Disk array is composed of a lot of cheap, small capacity, high stability, slow speed disks, which are combined into a large disk group. It can improve the performance of the whole disk system by using the bonus effect proced by the data provided by indivial disks. At the same time, when storing data, using this technology, the data is cut into many sections and stored on each hard disk. P
disk array can also use the concept of parity check to read out the data when any hard disk in the array fails. During data reconstruction, the data in the failed hard disk can be put into the new hard disk after calculation
the origin of disk array: P
the article "apcasepforp" published by University of California Berkeley in 1987. In this article, we talked about the word raid, and defined the five levels of raid. Berkeley University research aims to reflect the fast performance of CPU at that time. CPU efficiency grows about 30-50% every year, while hard magnetic machine can only grow about 7%. The research team hopes to find a new technology, in the short term, immediately improve the efficiency to balance the computing power of the computer. At that time, the Berkeley research group's main purpose was efficiency and cost. P
in addition, the research group has also designed fault tolerance and logical data backup, resulting in raidp theory. At the beginning of the study, inexpensive disks were also the main focus, but later it was found that a large number of Inexpensive Disk combinations could not be applied to the real proction environment. Later, expensive was changed to independence, and many independent disk groups. P
disk array, the trend of current events: P
since the PC, hard disk is the most commonly used storage device. But in the whole computer system architecture, compared with CPU and ram, the speed of hard disk is one of the weakest devices in PC. Therefore, in order to speed up the overall data flow of the computer, increase the storage throughput, and improve the security of hard disk data, the design of disk array comes into being accordingly. P
with the rapid development of science and technology, the capacity of hard disk has reached more than 40Gb, and the speed has reached 10000 or even 15000 rpm. Moreover, the price is very cheap. In addition to the popularity of enterprises, enterprise resource planning (ERP) is the main goal of every company to build a network. Therefore, the use of local area network to transfer data, the server used by the hard disk is very important, in addition to large capacity, speed, stability is the basic requirement. For this reason, disk array began to be widely used in personal computers. P
there are three styles of disk array: external disk array cabinet, internal disk array card and software simulation. External disk array cabinet is most commonly used in large servers, with the feature of hot swap, but the price of such procts is very expensive. Internal disk array card, because it is cheap, but it needs higher installation technology, so it is suitable for technicians to use and operate. In addition, the use of software simulation, because it will drag down the speed of the machine, is not suitable for large data flow server. P
from the above, we can see that IDE disk array is popular now; The stability and performance of IDE interface hard disk have been greatly improved. In addition to cost considerations, it is the best way to use IDE interface hard disk as the solution of disk array
but it is a bit unrealistic for indivial users to want disk array. First of all, your motherboard should support it, and if it doesn't support it, you need to buy array card, Then if your computer performance is not high, the array is meaningless!!
in the first mode, although you have four outlets to ship at the same time, it is impossible to scan and upload the data of the four outlets at the same time, Therefore, the data of the collector can be uploaded one by one; In the second mode, as long as it is within the coverage of wireless network, there is no constraint of the communication base of the collector, and N collectors can be uploaded anytime and anywhere.
One computer can be equipped with multiple CPUs, but computers on the market only have one CPU
In fact, computers can be installed with multiple CPUs, not only one processor. But there are usually no computers with multiple CPUs on the market First of all, only one CPU is installed in the computer, which is determined by the market demand. Most people use a computer only to watch plays, play games, go to the web, or because of the relationship between work and study, they need to deal with files or something. These operations do not require high performance of the computer. Although some people pursue the ultimate performance and have strict requirements on the CPU of the computer, only a small number of such peoplethe former is the main market share, and the direction of proction is determined by the demand of consumers. Even if the voice of high-end players is high, manufacturers will only follow the mainstream market, so the most common is the computer with only one CPU
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multiple CPUs generally do not appear on ordinary home computers. Only workstations and servers with heavy workload will use multiple CPUs. This requires a strong ability to expand and has a high requirement on the processor. If there is only one CPU, it is not enough
installing a CPU in a computer is also related to the cost. Central processing unit (CPU) is the computing core and control core of a computer. Generally, CPU is one of the most expensive components of a computer. If you want to use al processors, the cost of the computer will increase a lot, and correspondingly, the price of the computer will also increase, which is not cost-effective for ordinary users, because it does not need such high performance
the overall proction cost of the computer is also much higher. Manufacturers in the proction, according to the general computer standards to proce other computer components. If we need to design a al CPU computer now, other components need to be changed, so the loss of benefits is great. In addition, installing only one CPU is also related to the current level of CPU
in memory, there are 5-10 connections.
if the remote connection is on but there is no operation, it will not take up much resources, just a little bit of bandwidth.
it is very small, a little bit
but if multiple connections are operated together,
there will be a problem Now the phenomenon of grabbing the mouse is happening
and if every connection runs a lot of programs, it will be stuck
hehe, the general result is that all the connections are stuck
You can link multiple printers. Generally speaking, there are several USB sockets on the computer. If you have more sockets, you can link several more.
if you don't have many sockets, you can add network printers. In this way, you can use more printers on a computer
but in fact, e to the power supply problem, there will be some problems when you connect too many USB devices, so generally speaking, you can connect as many USB devices as you provide on your computer
a general motherboard can only be connected to two or four motherboards at most. If you need more motherboards, you need to install expansion cards.