A program is run on a 2.1 GHz processor. The program's code consists of 10,000;instructions, with the following instruction...
A program is run on a 2.1 GHz processor. The program's code consists of 10,000;instructions, with the following instruction mix and clock cycle count;Instruction Type Instruction Count;(# of such instructions);Clock Cycle Count;(# of clock cycles / instr.);Integer arithmetic 5000 1;Data transfer 3000 2;Floating point 1500 2;Control transfer 500 2;Determine this program?s (i) effective CPI and (ii) the percentage of time doing FP ops.;(b) A new computer with enhanced architecture run 16 times faster than the original;machine, but it is usable only 1/8 of the time. What is the speedup?;(c) A program takes 15 seconds to execute on a single 1.8GHz processor. 30% of the;program is sequential. Assuming zero latency and perfect parallelism in the remaining;code, how long should the code take on a 20 core processor machine?;(d) A computer uses instruction pipelining with P=4 stages named FD, DO, EX, WO.;Each stage takes T seconds to perform its task. Suppose you have N=9 instructions in;your program which has a branch from instruction 4 to 8. Draw a figure to show what;happens over time as each instruction is processed. Indicate the branch penalty.;Question 2.;Consider the following code sequence;i: R7 R12+R5;i+1: R8 R7-R12;i+2: R5 R8+R7;(a) List the RAW dependencies, if any;(b) List the WAR dependencies, if any, rewrite code showing how to avoid them;(c) List the WAW dependencies, if any, rewrite code showing how to avoid them
Paper#70881 | Written in 18-Jul-2015Price : $22