A Tour of the Pentium Pro Processor Microarchitecture
Introduction
One of the Pentium Pro processor's primary goals was to significantly exceed the performance of the 100MHz Pentium processor while being manufactured on the same semiconductor process. Using the same process as a volume production processor practically assured that the Pentium Pro processor would be manufacturable, but it meant that Intel had to focus on an improved microarchitecture for ALL of the performance gains. This guided tour describes how multiple architectural techniques - some proven in mainframe computers, some proposed in academia and some we innovated ourselves - were carefully interwoven, modified, enhanced, tuned and implemented to produce the Pentium Pro microprocessor. This unique combination of architectural features, which Intel describes as Dynamic
Execution, enabled the first Pentium Pro processor silicon to exceed the original performance goal.
Building from an already high platform
The Pentium processor set an impressive performance standard with its pipelined, superscalar microarchitecture. The Pentium processor's pipelined implementation uses five stages to extract high throughput from the silicon - the Pentium Pro processor moves to a decoupled, 12-stage, superpipelined implementation, trading less work per pipestage for more stages. The Pentium Pro processor reduced its pipestage time by 33 percent, compared with a Pentium processor, which means the
Pentium Pro processor can have a 33% higher clock speed than a Pentium processor and still be equally easy to produce from a semiconductor manufacturing process
(i.e., transistor speed) perspective.
The Pentium processor's superscalar microarchitecture, with its ability to execute two instructions per clock, would be difficult to exceed without a new approach. The new approach used by the Pentium Pro processor removes the constraint of linear instruction sequencing between the traditional "fetch" and
"execute" phases, and opens up a wide instruction window using an instruction pool. This approach allows the "execute" phase of the Pentium Pro processor to have much more visibility into the program's instruction stream so that better scheduling may take place. It requires the instruction "fetch/decode" phase of the Pentium Pro processor to be much more intelligent in terms of predicting program flow. Optimized scheduling requires the fundamental "execute" phase to be replaced by decoupled "dispatch/execute" and "retire" phases. This allows instructions to be started in any order but always be completed in the original program order. The Pentium Pro processor is implemented as three independent engines coupled with an instruction pool as shown in Figure 1 below.
What is the fundamental problem to solve?
Before starting our tour on how the Pentium Pro processor achieves its high performance it is important to note why this three- independent-engine approach was taken. A fundamental fact of today's microprocessor implementations must be
Jean Piaget and Lev Vygotsky are two of the most influential philosophers in the field of cognitive development. Although people think they are very similar, they are actually different in many situations. Basic ideas of cognitive development they share but there are huge differences in certain stages of their ideas. There is also a huge difference in the idea of Autonomy and heteronomous.
By 1984, a combination of factors had contributed to lowering the profitability of the DRAM industry. As the DRAM industry matured, DRAMs began to take on the characteristics of a commodity product (Burgelman, 1994; Burgelman & Grove, 2004). Competitors had closed the gap on Intel’s lead in technology development causing the basis of competition to shift towards manufacturing capacity. Gaining market share in an industries where product features had become standardized required companies to agressively pursue capacity expansion, while engaging simultaneously in cutthroat price competition. Also, with each successive DRAM generation, companies wishing to keep pace with the demand for increasing production yields were forced to commit increasingly large capital investments to retrofit their fabrication facilities. Figure 1 contains a snapshot of the DRAM industry between the periods of 1974 through 1984. The important thing to note is that Intel begins to fall behind the competition beginning with the 16K generation and is virtually non-existent in any of the future generations (Burgelman, 1994).
Intel's business grew a bit in the years to come as it got bigger and made improvements on the way that products were made, and produced a wider range/variety of those products. Even though Intel created the first publically available processor (Intel...
Computer hardware engineers research, develop, and test computer systems and components such as processors, circuit boards, memory devices, and many more (Bureau of Labor Statistics). They design new computer hardware, create blueprints of computer equipment to be built. Test the completed models of the computer hardware that they design. Update existing equipment so that it will work will new software. Oversee the manufacturing process for the computer hardware. Maintain knowledge of computer engineering trends and new technology(Bureau of Labor Statistics).
The hardware subsystems managed to hit new milestones, but the software kept on falling behind schedule.
According to the casing study, Intel’s “Rebates” and Other Ways It “Helped” Customers Intel paid customer huge pay. As the dominating company, they purposely paid other companies not to use ADM products. They paid Dell 6 billion dollars over a 5 year period (Velasquez, 2014). In addition, they knew ADM would not be able to compete with them: they took advantage of their size and used their rebate program to try and ADM from advancing in the x86 processor industry. In addition, Intel’s monolply-like behavior is displayed in the terms of quality. They did not care about customers wanting the reliable x86 processors, they wanted to monopolize the market with their product, and would pay a huge amount of money to achieve their
Jean Piaget is a Switzerland psychologist and biologist who understand children’s intellectual development. Piaget is the first to study cognitive development. He developed the four stages of cognitive development: the sensori-motor stage, preoperational stage, the concrete operational and the formal operational stage. Piaget curiosity was how children cogitate and developed. As they get mature and have the experience, children’s will get knowledgeable. He suggested that children develop schemas so they can present the world. Children’s extend their schemas through the operation of accommodation and assimilation.
Stress is defined as “any circumstances that threaten or are perceived to threaten one’s well-being and thereby tax one’s coping abilities” (Weiten & Lloyd, 2006, p. 72). Stress is a natural event that exists literally in all areas of one’s life. It can be embedded in the environment, culture, or perception of an event or idea. Stress is a constant burden, and can be detrimental to one’s physical and mental health. However stress can also provide beneficial effects; it can satisfy one’s need for stimulation and challenge, promote personal growth, and can provide an individual with the tools to cope with, and be less affected by tomorrow’s stress (Weiten & Lloyd, 2006, p. 93).
For Vygotsky, children are seen as active beings on their development through social interactions with parents, teachers, and other adults, as well as by participating in their cultural activities. The interactions they have with other individuals and their culture opens their minds to new information and helps develop skills not previously attained. To further understand cognitive development in Piaget and Vygotsky’s theory, we must first look at the processes involved.
Lev Vygotsky (1896-1934) has developed a sociocultural approach to cognitive development. He developed his theories at around the same time as Jean Piaget was starting to develop his ideas (1920's and 30's), but he died at the age of 38 and so his theories are incomplete - although some of his writings are still being translated from
We have the microprocessor to thank for all of our consumer electronic devices, because without them, our devices would be much larger. Microprocessors are the feat of generations of research and development. Microprocessors were invented in 1972 by Intel Corporation and have made it so that computers could shrink to the sizes we know today. Before, computers took a room because the transistors or vacuum tubes were individual components. Microprocessors unified the technology on one chip while reducing the costs. Microprocessor technology has been the most important revolution in the computer industry in the past forty years, as microprocessors have allowed our consumer electronics to exist.
This case traces the strategic decisions of Intel Corporation which defined its evolution from being a start-up developer of semiconductor memory chips in 1968 to being the industry leader of microprocessors in 1997 when it ranked amongst the top five American companies and had stock market valuation of USD 113 billion.
A processor is the chip inside a computer which carries out of the functions of the computer at various speeds. There are many processors on the market today. The two most well known companies that make processors are Intel and AMD. Intel produces the Pentium chip, with the most recent version of the Pentium chip being the Pentium 3. Intel also produces the Celeron processor (Intel processors). AMD produces the Athlon processor and the Duron processor (AMD presents).
Stress is an ongoing dilemma that occurs in each and everyone’s life. It is a factor that is undoubtedly a part of daily living. Due to the trivial problems that occur in people’s daily lives massive amounts of stress can arise. People perceive and manage stress in many different ways. The causes and effects of stress are numerous and one’s ability to manage stress is vital in maintaining healthy living.
The next major improvement is the memory of a computer. This includes the hard drive and the RAM. During the same generation as the 386, there was also the hard drive and RAM. But these two components were not much then. The hard drive was about 100-300 megabytes and the RAM was about 4 megabytes.