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CPSC 240
Assignment 4 Benchmark
Introduction
The term “benchmark” generally means the act of measuring the performance of something.
In computer science the term is used to describe the performance of software or hardware
components. Bench marking is not testing to uncover bugs. We assume bugs have been
removed during earlier testing. Bench marking seeks to measure the use of time and space
by a program or by a processor.
Abstract view
Create a program with modules in the three languages of this course that will benchmark the
performance of the square root instruction in SSE and also the square root program in the
standard C library
Detail
We want to know how much time is require for an instruction to execute. We’ll use the sqrtsd
instruction in the SSE component. The plan is to execute to execute the sqrtsd instruction
many times, say 10 million times. Measure the time required for those 10 million
computations, then divide the execution time by 10 million to obtain a kind of average
execution time for one instance of the sqrtsd instruction.
Why not simply execute the instruction one time and measure the elapsed time? The simple
reason is that performance varies and is dependent on other factors. One factor is the clock
speed of the cpu will vary with time. However, the average execution time computed over
millions of executions is probably a reasonably accurate measure of the true execution time
for the instruction.
Sample dialog baseline
Welcome to Square Root Benchmarks by Jeffrey Miller
For customer service contact me at millerx86@csu.fullerton.edu
Your CPU is AMD Ryzen 3640.
Your max clock speed is 2800 MHz
Please enter a floating radicand for square root bench marking: 12.2
The square root of 12.1999999995 is 3.78457514234.
Next enter the number of times iteration should be performed: 1500000
The time on the clock is 2451294 tics.
The bench mark of the sqrtsd instruction is in progress.
The time on the clock is 2451399 tics and the benchmark is completed.
The elapsed time was 238884 tics
The time for one square root computation is 27.36841 tics which equals 9.28441 ns.
The main function has received this number 9.28441 and will keep it for future reference.
The main function will return a zero to the operating system.
Color codes:
Yellow: get_radicand
Green: main
White: manager
Most of the output come from manager.
Notes about the dialog and about other things
A tic is a unit of time used by computers. A second is a unit of time used by humans. “ns”
means nanosecond. The conversion from number of tics to number of nanoseconds requires
knowledge of the machines clock speed.
Replace Jeffery Miller with your own name and email address.
The numbers shown in the dialog are not mathematically correct. They are place holders to
show the form of the output.
The computed execution time will vary with clock speed. The same program run on different
computers will produce different execution times for the square root instruction.
The name of the number of which you compute the square root is radicand.
Make this program reach the professional level so that you can put it into your portfolio.
The portfolio of a computer science major is the collection best products produced during a
person’s university career. The portfolio is typically shared with a job interviewer when such a
person asks to see some of what you have done. Obviously, only your best works go into
your portfolio.
CPSC 491 is the place to make a large project for your portfolio. But it is ok to include other
smaller projects like this assignment in your portfolio.
A program that uses e-registers will not be graded.
Clock speed and clock frequency are the same thing. The unit of measure of frequency is
usually the number of tics per second. One tic per second is called 1 Hertz. A billion tics per
second is called 1.0 GHz. Sometimes clock frequency is converted to megahertz or MHz.
The getfrequency function mentioned in this document has been created many times by
students enrolled in 240. If you make a web search your will probably find multiple copies of
that function. If you ask politely Johnson may even remember where he last saw that
function.
Is reusing someone’s software ok? Yes, provided that person has placed a suitable software
license on it. In commercial programming all new project reuse software whenever available
and licensed properly for reuse.
Calling diagram
The main loop which repeatedly computes the square root of a fixed radicand is inside
manager. You want that loop to execute as fast as possible. Don’t let the loop access
memory, call a function, or transfer data between SSE and GPRs
Don’t use any e-registers unless you are living two decades ago and you are visiting the year
2023 via a time warp. In the later case please go back to 2003 and enjoy your programming
there.
main
C or C++
manager
asm
get_clock_freq
any
getradicand
asm
r.sh
bash
What is an email attachment.
This is for those people who claim the only way to send file is via a cloud storage service.
When you attach files to your email it must look like this:
You can physically see the files are intrinsically part of the email itself. That is good. Your
files will be separated from the email message and will be graded.
Anything else is a link to never never land, and will not be graded.
Conclusion
Due time: April 16 before 4:00am. After 4am get 3 hours of sleep and be ready for class on
Monday.
It is unknown if I will be able to grade this assignment for points. If I an foresee sufficient time
to include grading this assignment then I will update this page and I will announce that in the
lectures. As of now I don’t know.
The point value of this program is 15 points for the program. There is no challenge part.
Should you do assignment 4 if no points are involved? Yes, you should make this program for
the simple reason that the technology of the cpu clock will appear on the final tests: concepts
and programs.
This document was created in Libre Office, https://www.libreoffice.org/, and reviewed successfully in
Google Docs.

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