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CPU Performance Equation. The main idea is to represent machine performance and program execution in terms of a high level abstract machine model. oYxO��d�+��q�R���jۍ��n��2��$b>��q�Q�\��}ޢnk'ż"�>9�����q�85����ʎ��L���Dk=ur���V�c�2�+��S�r�n�~o'��A�h�8V�L�X�� t=1/f, f=clock rate. CPU Performance Equation - Example 3. Many processors expose performance-monitoring counters that help measure 'productive performance' associated with workloads. A Note About Instruction Count •. Ic: Number of Instructions in a given program. … 7 0 obj
Workload Frequency Scaling Law - Derivation and Verification Workload scalability has a cascade relation via the scale factor. Formatted 9:28, 16 March 2012 from lsli02. In this dissertation we propose and investigate a new approach to CPU performance evaluation. decrease) CPU time: Many potential performance improvement techniques primarily improve one component with small or predictable impact on the other two. For Intel Nehalem and AMD processors, Turbo is disabled by default on P-state-based platforms. Hydrological forecasting plays an important role in basin flood control systems, and the uncertainty of hydrological forecasting is helpful to reveal basin hydrological characteristics and provide support to decision makers in formulating water resources management schemes. endobj
CPU Time = I * CPI/R. 9 0 obj
CPU Time = I * CPI / R. R = 1/T the clock rate. 0000001647 00000 n
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[10] What is the CPU performance equation, and what do the variables refer to? <>
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Gate coach faculty is explaining CRE topic- performance equation of CSTR. Here, I = Total number instructions in a program. Execution time: CPI * I * 1/CR CPI = Cycles Per Instruction I = Instructions. endstream
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Basic Performance Equation. For example, with a base CPI of 1, the CPU time from the last page is: CPU time = (I+ 0.2 I) x Cycle time What if we could doublethe CPU performance so the CPI becomes 0.5, but memory performance … 20% of the dynamic instructions in an application are multiplies. CPU Performance Equation - Pipelining A. Ardö, EIT Lecture 6: EITF20 Computer Architecture November 13, 2013 4 / 56. logoonly Summary Pipelining - Implementation Problem Simple Scoreboard Tomasulo Tomasulo + Speculation Static Sch Dynamic Scheduling RAW forwarding wait (Read) CDB CDB Performance Equation - I CPU execution time = CPU clock cycles x Clock cycle time Clock cycle time = 1 / Clock speed If a processor has a frequency of 3 GHz, the clock ticks 3 billion times in a second – as we’ll soon see, with each clock tick, one or more/less instructions may complete If a program runs for 10 seconds on a 3 GHz processor, how many clock cycles did it run for? 0000001509 00000 n
The instruction count in the performance equation is the “dynamic”instruction count. 0000000596 00000 n
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• Describes the performance gains by enhancing one part of the overall system (code, computer) • Amdahl’s Law depends on two factors: – Fraction of the execution time affected by enhancement – The improvement gained by the enhancement for this fraction org … The equation would be: 164 0 obj <>
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† Clocks per Instruction (CPI) Determined by ISA, microarchitecture, compiler, and program. t: Cycle time. CPU time = (CPU execution cycles + Memory stall cycles) x Cycle time Processor performance traditionally outpaces memory performance, so the memory system is often the system bottleneck. 100% (3 ratings) The Processor Performance Equation is,CPUTime ,T= (Instruction Count* CPI) / Clock rate. 02-2. The hydrologic uncertainty processor (HUP) has been widely employed in hydrological uncertainty prediction. •“Dynamic”. x�b```f``Z������ Ā B�@���1&�( py��uN��8�q0�a�c0R����˰��R���1�A�A�AiSt���Nz:WX'1VH[#���`��Z�U���ˠh�t�q#�A��0��v endstream
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since the clock rate is the inverse of clock cycle time: CPU time = Instruction count *CPI / Clock rate . 0000002218 00000 n
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[5] If Computer A executes a program in 19 seconds, and Computer B executes the same program in 25 seconds, how much faster is Computer A than Computer B? Basic Performance Equation. Across the reactor itself equation for plug flow gives, -----(1) Where F’A0 would be the feed rate of A if the stream entering the reactor (fresh feed plus recycle) were unconverted. 02-1. CPU performance equation is one way to start answering these questions. CPU time for … 02-1. "��֤��4i���+ꀹ��ZqK��ҩ=M��~�ͼ�\��*G�� �e맀
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��*���x'>���Edt�(�R�m�N8����EIl]�8|��V��d�ʄ*�#���`[O!���=��*б*㕉9~������|>W�6���9?�DX�?l��%�`�Z�q͒8I�L�Kl��G��ˋk1����$����KzM81�%�t2{B�l_C;%�� A new processor cuts the CPI for multiplies from 10 to 5 but increases the cycle time by 10%. 6. EE 4720 Lecture Transparency. These combined to form CPU Performance Equation tT = 1 ` £CPI£IC, 4 0 obj
CPU Performance Decomposed into Three Components: † Clock Frequency (`) Determined by technology and in°uenced by organization. T = clock cycle time. The scale factor of workload is also influenced by clock frequency as selected by frequency-selection governors. The exponential processor transistor growth predicted by Moore does not always translate into exponentially greater practical CPU performance. Design Alternative 2: Reduce average CPI of all FP instruction to 2. 0000006733 00000 n
?�����������?�*�B�#�xĐ�%���q��}�տ}}�|�Փ�C=~|��x�h�Ő�;?|����������x�w�������������ןn�?���w���_��Ǔg����w�������_�|��yO�?�zu�ډ��Ś�> ��-1�a)0.+�x� ��c�ri����8�ݑ?�R�� Since around 2005–2007, Dennard scaling has ended, so even though Moore's law continued for several years after that, it has not yielded dividends in improved performance. The performance of a Processor depends on Instruction count, parameter and C view the full answer. 0000006470 00000 n
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Write down the CPU performance equation and deﬁne each of the terms. 2 0 obj
Boussinesq’s 1872 paper introduces the equations now known as the CPU Performance Equation: ACA- Lecture CPU Performance Equation: ACA- Lecture Execution Time (T): T: CPU time (seconds/program) needed to execute a program. 5 0 obj
CPU performance equation. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The performance equation analyzes execution time as a product of three factors that are relatively independent of each other. Equations: CPU Time = I * T * CPI. Many processors expose performance-monitoring counters that help measure 'productive performance' associated with workloads. CPI = Clocks needed to complete an instruction. Performance Equation - I • CPU execution time for a program = CPU clock cycles x Clock cycle time • Clock cycle time = 1 / Clock speed-If a processor has a frequency of 3 GHz, the clock ticks 3 billion times in a second – as we’ll soon see, with each clock tick, one or more/less instructions may complete. CPU Time = I * CPI * T. I = number of instructions in program. [10] CPU performance analysis a. Productive performance is typically represented by scale factor, a term that refers to the extent of stalls compared with stall-free cycles within a time window. startxref
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Question: Determine the number of instructions for P2 that reduces its execution time to that of P3. trailer
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CPU Clock Cycle (This equation is commonly known as the CPU performance equation) (executed, I) CPI = Cycles Per Instruction Executed (I) b. 0000000016 00000 n
Latency = InstCount * CPI * cycle time 2. However, if a system supports Collaborative Processor Performance Control (CPPC), which is a new alternative mode of performance communication between the operating system and the hardware (defined in ACPI 5.0), Turbo may be engaged if the Windows operating system dynamically requests … T = Clock cycle time. Background loop with an “observation” variable.
What factor(s) can impact those variables? <>
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† Instruction Count (IC) Determined by program, compiler, and ISA. Frequency of FP instructions : 25% Average CPI of FP instructions : 4.0 Average CPI of other instructions : 1.33 Frequency of FPSQR = 2% CPI of FPSQR = 20 Design Alternative 1: Reduce CPI of FPSQR from 20 to 2. CPU Performance Equation Time for task =C T I C =Average # Cycles per instruction T =Time per cycle I =Instructions per task Pipelining { e.g. x����O�0�����#�ؾ���B�G41�R�p�s�d�����L���k_���Z�����g���Y������C! endobj
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The first step should be to find out the cycles per Instruction for P3. 0000001375 00000 n
Amdahl's law states that the overall speedup of applying the improvement will be: S latency = 1 1 − p + p s = 1 1 − 0.3 + 0.3 2 = 1.18. • The CPI can be divided into TWO component terms; 1 0 obj
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Here, R = Clock rate which can be measured by the inverse of Clock cycle time that means, R = 1/T. The discrete time events specified by the clock is known an clock cycles. If 30% of the execution time may be the subject of a speedup, p will be 0.3; if the improvement makes the affected part twice as fast, s will be 2. 1. endobj
I know the formula for performance is . CPU Performance Decomposed into Three Components: • Clock Frequency (φ ) … 0000002500 00000 n
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