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One, GIL: Global interpreter Lock1. GIL: Global Interpreter LockGil is essentially a mutex, which is sandwiched between the interpreter,All threads within the same process need to grab the Gil lock before executing the interpreter code2. Gil's Advantages and disadvantages:Pros: Ensure thread safety for CPython interpreter memory managementDisadvantage: All threads in the same process can only have one execution at a time, and it is said that multithreading of the CPython interpreter cannot be im
process of computer chips is also progressing, but it is difficult to improve the process in order to increase the speed of operation and to meet the Moore theorem, so Intel, AMD successively in the adoption of horizontal expansion is to add more CPUs, thus dual-core, 4-core, N-core continuously launched, so we entered the multicore era .So a question arises, what does the advent of the multicore era mean
Coincidentally, when I started the translation of the book, I had just begun my first four-core computer, and when the translation work was nearing completion, I added an ipad 2 (a dual-core computer). This shows that multicore computers have fully entered my daily life. Since I'm a guy who lags far behind fashion (for example, I'm not too cold on a dual-core cell phone), I have no doubt that multicore comp
multiple cores can be computed in parallel, so multicore boosts compute performance by 3. Once each CPU encountered I/O blocking, still need to wait, so much check I/O operation is useless. A worker is the equivalent of a CPU, at which time the calculation is equivalent to the worker working, I/O blocking is equivalent to the work of the workers to provide the necessary raw materials, workers in the process without raw materials, The worker's work pr
system, the CPython process is a whole, and at the same time only one of the threads that gets the Gil is running, and the other threads are waiting for the Gil to be released. This explains the results of our experiments above: although there are two threads of the dead loop, and there are two physical CPU cores, because of the GIL limit, two threads just do ticks and the total CPU usage is slightly below 50%.It seems that Python is not a force. GIL directly causes CPython to not take advantag
The ARM + LINUX route focuses on the embedded Linux operating system and its application software development goals: (1) master the structure and principles of mainstream embedded microprocessor (initially set as arm9.) (2) must master The ARM + LINUX route focuses on the embedded Linux operating system and its application software development goals: (1) master the structure and principle of mainstream embedded mi
of the Inter processor consists of four numbers, for example, "0F24". from left to right, they indicate Type, Family, and Mode) and Stepping (step number ). Since CPUID is a "068X" processor, Inter adds a Brand ID to help the application identify the CPU type, therefore, the Pentium and Celerom processors cannot be correctly identified based on the "068X" CPUID. Must be subdivided with the Brand ID. AMD processors are generally divided into three types: Family, Mode, and Stepping, for example,
contains a total of four digits, such as "0f24", representing the type (type), Family (series), Mode (model), and stepping (step number), respectively, from left to right. Starting with a processor with the CPUID "068X", Inter added the brand ID (symbol) to assist the application in recognizing the CPU type, so the Pentium and Celerom processors are not correctly discriminated against according to the "068X" CPUID. You must match the brand ID to subdivide it. AMD processors are generally divide
With the development of IC card from a simple synchronous card to an asynchronous card, from a simple EPROM card to the internal microprocessor-based smart card (also known as CPU card), the requirements of the IC card is more and more high. The management of the card itself is more and more complex, so there is an urgent need to have a tool to solve this contradiction, and the emergence of the internal microproce
microprocessor architecture in load and store memory, if the access address is an integer multiple of N, n Bytes can be operated at a time (n = 2 ^ m), but if the n Bytes of the operation are in the address, the remainder of N is not 0, two or more clock cycles are required, especially when the address crosses the cache line, the performance impact is more serious. For example, if you want to read the 4 byte int variable, if the physical address of t
/~MCWhen the pin for high-level is indicated by the microprocessor mode (microprocessor), for low-current to indicate the micro-computer mode (microcomputer), when the microprocessor mode, 2812 internal bootrom is forbidden, through the Zone7 (0x3F C000) starts from the external tuning boot program. 2812 after reset, its reset vector is a fixed 0x3fffc0, if it is
processor I/O pins, we must take into account certain pins that are restricted when using the internal functions of the processor, such as serial interfaces and timers.2.2. Number of interfaces to be usedThe main function of the embedded processor is to interoperate with the hardware in the application environment, which not only requires the external hardware to have real-time processing capability to the interface, but also requires the processor to efficiently handle the interface data at a
data is output for the fourth cycle, the write signal is output for the second clock cycle, and 5th clock ends, the output of the 7.5 clock cycle is the PC address, which is used to prepare for the next instruction. Figure 2 shows the result of Waveform Simulation by ModelSim se6.0. 4 microprocessor commands Data processing commands: data processing commands perform arithmetic and logical operations on the data in the register. Other commands on
Development and Research of Embedded Controller of Instrument System [Date:] Source: EDN Author: [Font:Large Medium Small] The application of embedded systems in the field of instrumentation has become a trend in the development of the instrumentation industry by combining traditional instrumentation, Internet, and microprocessor. This paper first introduces the embedded controller based on the Embedded Intelligent Instrument re
longer competent. To meet the needs of new Applications in the mobile communication and Multimedia fields, Texas Instruments Corporation proposed the architecture of Open Multimedia application Platform OMAP (Open Multimedia Applications Platform) and designed an OMAP chip for this purpose. It uses a unique dual-core structure that combines a high-performance, low-power DSP core with an ARM microprocessor with strong control performance to form a hig
lock and automatic accumulation function. When performing read/write operations on the continuous address area, you only need to send the first address of the storage area.3 Application of fm31256 in electromagnetic casting and rolling power supply controlThe fm31256 is applied to the electromagnetic casting and rolling power control device to realize the function of resetting the guard dog, setting parameters, real-time clock, and saving fault records of the main control system.As an effective
important thing is not to accurately calculate the code length of a program, but to clearly estimate the upper limit of the code length. According to experience, if 80% of the RoM space is occupied by code, it will be too crowded unless it can ensure that the system requirements will not change, otherwise, at least reserve enough spare Rom space for possible changes.In most cases, we can try to write some program code in the Rom to observe the space occupied by the Code. For a
circuit (IC) to an integrated system (is. 1994Flex released by MotorolaCore System (used to make custom microprocessor based on 68000 and PowerPC) and SOC designed by lsilogic for Sony in 1995, may be based on IP (IntellectualProperty) Core completed the first report of SOC design. Because SOC can make full use of existing design accumulation and significantly improve the design capability of ASIC, the rapid development has caused the industryAnd aca
Top 10 microprocessors As a "old bird" who has been engaged in the electronic industry and is full of dust and sweat The MCU has three digits, right. To put it bluntly, the microprocessor is a machine that handles things, just like a human The brain is also the publishing center for all behavior commands. Throughout the electronics industry, the development of microprocessor is particularly rapid, coupled w
are used as SCL.ArduinoYun SPI SPI is the abbreviation of Serial Peripheral Interface. It is a synchronous Serial Peripheral Interface that uses the ICSP header (Number 6 in Figure 1.4 ).External interruption of ArduinoYun Interrupt allows the processor to run more efficiently. Yun has five external interruptions. They reuse ports 3, 2, 0, 1, and 7 respectively. The interrupt details will be introduced in chapter 4th, which will not be described here.Two mi
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