程序代写代做代考 CS 241-96
CS 241-96
MP 1: Advanced Parallel Programming∗
Assigned: March 2, 2016
Due: 11:59PM CST, March 20, 2016
1 Running Your Code
In this MP, we will be using software which is not installed on your CS 241 virtual machines. Instead, you will
have to work on EWS machines. You may use any of the lab computers in Siebel, DCL, Grainger, ECEB, etc., or
work remotely by logging into linux.ews.illinois.edu via ssh.
The tools we will need are not available to you by default on EWS. Before beginning work on this assignment,
add the following lines to the end of your ~/.bashrc:
module load mpich2
module load intel-license/ews
module load intel-composer
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/class/cs232/REU/tbb/lib/
To make these changes take effect, either restart your terminal or run
$ source ~/.bashrc
Failure to do this can result in one or both of the following:
• The timing library yelling at you and refusing to compile.
• MPI yelling at you and refusing to compile or refusing to run or running but producing incorrect results.
If you choose not to complete this MP on EWS, we will not help you configure your machine.
2 Problems
1. (30 points) Getting Started
In this part of the MP, you will familiarize yourself with OpenMP and MPI by writing some simple parallel
code. Specifically, you will change all the text in a file to upper-case. You can find the serial version of this
code in toupper_serial.c.
You can run this code with
./toupper_serial big_text_file.txt
If you want to see the output from your code, run
./toupper_serial -print big_text_file.txt
∗Based on exercises written by Craig Zilles
1
CS 241-96 MP 1: Advanced Parallel Programming Handout
The interface for each parallel version of toUpper is the same as the interface for the serial one.
Running the provided makefile will produce shakespeare.txt, which is a text file containing the complete
text of every work of William Shakespeare. You also have access to eight_shakespeares.txt, which
is the contents of shakespeare.txt repeated eight times. Both of these are good text files to use when
benchmarking your parallel code against the serial version.
(a) (10 points) Implement toUpper using OpenMP in toupper_omp.c.
(b) (20 points) Implement toUpper using MPI in toupper_mpi.c. You will need to do some extra work
to move the transformed text back to a single process in order to print it. We will test your code using
the -print command line argument, so you must implement printing to receive full credit for this part.
2. (70 points) Parallel Histograms
In this part of the MP, you will write code to count the frequency of characters in a text file. You will start by
writing serial code for this and then moving on to OpenMP and MPI.
You can run the serial version of this code with
./histogram_serial big_text_file.txt
If you want to see the character frequencies your code calculates, run
./histogram_serial -print big_text_file.txt
The interface for each parallel version of histogram is the same as the interface for the serial one.
(a) (10 points) Implement the serial version of histogram in histogram_serial.c.
(b) (30 points) Implement histogram using OpenMP in histogram_omp.c.
(c) (30 points) Implement histogram using MPI in histogram_mpi.c.
3 Grading
Your grade will depend on both your code’s correctness and its running time. That is, your code should not only
be correct, but it should be reasonably faster than the provided serial solution. In general, you should aim to have
parallel code that runs in about 2/3 the time the serial solution takes when no input or output is taking place.
Note that this is a general guideline; achieving this 1.5x speedup is not a guarantee of full points for running time
on all problems. There is no penalty for writing correct code which achieves greater speedup.
Your code will be tested on EWS machines; you should do the same when evaluating your code’s running
time. Do not use a remote connection to evaluate running time, as you may get artificially bad results.
4 Turning in the Assignment
Turn in your code by committing to svn. The following files will be graded:
• toupper_omp.c
• toupper_mpi.c
• histogram_serial.c
• histogram_omp.c
• histogram_mpi.c
In particular, do not modify the provided makefile.
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