Mon Jul 14, 2: The answers can now be found in the Wheelock Answer Key OK, so I read each chapter of Wheelock and try to learn the grammar, vocab etc. Then I do the self-tutorial exercises at the back, and then check my answers. Every chapter I find that I get at least some wrong, but that's fine, because that makes me recheck that bits I missed, and shows me where I have to be more careful in future.
Quartz module avail gcc module avail intel module avail pgi module avail clang use -l gcc use -l icc use -l pgi use -l clang You can also see the Compiling OpenMP Programs section of the tutorial.
Create a simple OpenMP program that does the following: Creates a parallel region Has each thread in the parallel region obtain its thread id Has each thread print "Hello World" along with its unique thread id Has the master thread only, obtain and then print the total number of threads If you need help, see the provided or Using your choice of compiler see above section 4compile your hello world OpenMP program.
When you get a clean compile, proceed.
Run your hello executable and notice its output. Is it what you expected? How many threads were created? By default, most compilers will create 1 thread for each core. For some reason, the PGI compiler will create only 1 thread by default.
For the remainder of this exercise, you can use the compiler command of your choice unless indicated otherwise. Compilers will differ in which warnings they issue, but all can be ignored for this exercise. Errors are different, of course. Notice that the order of output is more or less random.
This completes Exercise 1 Exercise 2 Still logged into the workshop cluster? If so, then continue to the next step. If not, then login as you did previously for Exercise 1. Notice that it specifies dynamic scheduling of threads and assigns a specific number of iterations to be done by each thread.
First, set the number of threads to 4: Note that it is piped through the sort utility. This will make it easier to view how loop iterations were actually scheduled across the team of threads.
Run the program a couple more times and review the output. What do you see? Typically, dynamic scheduling is not deterministic. Everytime you run the program, different threads can run different chunks of work.
It is even possible that a thread might not do any work because another thread is quicker and takes more work. In fact, it might be possible for one thread to do all of the work. Edit the workshare1 source file and change the dynamic scheduling to static scheduling.
Recompile and run the modified program. Notice the difference in output compared to dynamic scheduling. Specifically, notice that thread 0 gets the first chunk, thread 1 the second chunk, and so on.
Run the program a couple more times. Does the output change?
With static scheduling, the allocation of work is deterministic and should not change between runs, and every thread gets work to do. Reflect on possible performance differences between dynamic and static scheduling.
After reviewing the source code, compile and run the program. It shows which thread did each iteration and the final result matrix. Run the program again, however this time sort the output to clearly see which threads execute which iterations: As before, compile and execute the program after reviewing it.
Because there are only two sections, you should notice that some threads do not do any work. For example, the first time thread 0 and thread 1 may do the work, and the next time it may be thread 0 and thread 3. It is even possible for one thread to do all of the work.leslutinsduphoenix.com is the place to go to get the answers you need and to ask the questions you want.
In addition, the correct answers to each tutorial exercise are provided in the end of the exercise but I strongly encourage you not to look at the answers until after you have finished the exercise.
The data for mastery exercises will be made available for downloading from this web site. Non-Graded Exercises/Examples All suggested questions from the book have at least partial answers in the above PDF file. For more sample questions + solutions see the tutorial page.
XML. Suggested exercises from the book: (part 4 only) parts 1 and 2 only. Note: there's no answer in the back of the book for this. Welcome to C# Tutorial It is a free online C# Tutorial in which you will get great number of C# programs and definitions in easiest way.
Our experts have tried to keep program complete and easy to understand so you can copy . leslutinsduphoenix.com is a moderated chat forum that provides interactive calculus help, calculus solutions, college algebra solutions, precalculus solutions and more. Math Exercise on the Abacus (“Suanpan” in Chinese) • Teachers’ Introduction • Student Materials Introduction Cards Practicing Basics Cards