Reliability in microcomputer performance indicators refers to the ability of a computer system to continuously perform its functions under specified conditions and within a specified time. Microcomputer performance indicators include: word length, clock frequency, computing speed, storage capacity, access cycle, reliability, maintainability, mean time between failures, etc.
After a product is accepted and put into operation, over time, the entire The product does not work properly and then works fine again after troubleshooting. The good and bad nature at this time can be expressed by the reliability of the product.
For example, if a certain type of rocket is launched 5 times and fails 4 times, the reliability measured by the number of times is 20%. For another example, if an aircraft is grounded for 156 hours due to a fault and is expected to be overhauled after 3,000 hours, the reliability measured by the time between failures is (1-156/3000) × 100% = 94.8%
Computer Reliability
The reliability of a computer system is also defined in this way: within a given period of time, the computer system's ability to perform its intended functions.
Since the computer system is composed of hardware and software, their impact on the reliability of the entire system has completely different characteristics: hardware is the same as the mechanical parts of general artificial products, and it will break down over time. Software, on the other hand, becomes more reliable over time. Because hidden errors are gradually discovered and eliminated, there are no problems such as wear, oxidation, looseness, etc.
So, computer reliability refers to the study of hardware reliability and software reliability respectively.
Extended knowledge: Performance indicators
Computer performance indicators involve many factors such as architecture, software and hardware configuration, instruction system, etc. Generally speaking, the main technical indicators are the following .
Word length
The word length refers to the number of bits of binary data that can be processed simultaneously by the computer's computing unit at one time. The longer the word length, the higher the computing accuracy of the computer if it is used to store data; the stronger the computer's processing power if it is used to store instructions. Usually the word length is always an integer multiple of 8, such as 8, 16, 32, 64 bits, etc. Intel 486 machines and Pentium 4 machines are both 32-bit machines.
Clock frequency
The clock frequency refers to the clock frequency of the CPU. Its level determines the speed of the computer to a certain extent. The main frequency is measured in megahertz (MHz). Generally speaking, the higher the main frequency, the faster the speed. Due to the rapid development of microprocessors, the main frequency of microcomputers is also constantly increasing.
Computing speed
The computing speed of a computer usually refers to the number of instructions that can be executed per second. It is commonly referred to as Million Instructions Second (MIPS). express. This indicator can more intuitively reflect the speed of the machine.
Storage capacity
Storage capacity is usually divided into memory capacity and external memory capacity, here mainly refers to the capacity of internal memory. Obviously, the larger the memory capacity, the larger the program the machine can run and the stronger the processing power. In particular, current multimedia PC applications mostly involve image information processing, which requires increasingly larger storage capacity, and some software cannot even be run without sufficient memory capacity. At present, the memory capacity of most microcomputers has reached 4GB.
Access cycle
The access cycle of internal memory is also one of the main indicators that affects the performance of the entire computer system. Simply put, the access cycle is the time it takes for the CPU to access data from internal memory. Currently, the memory access cycle is between 7-70ns.
In addition, computer reliability, maintainability, mean time between failures and performance-to-price ratio are also technical indicators of computers.
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