Description
1. Hello World
1. Three simple versions of the Hello-World program are in files, hello[123].chpl. Read, then compile
and run these programs:
linux> chpl -o hello1 hello1.chpl
linux> ./hello1 -nl 1
Hello, world!
…
Note that to run a chapel program, you need to include the switch “-nl 1”. This is because on our
Linux system, the Chapel compiler is built to generate target code that is suitable for running across
multiple locales. The switch “-nl 1” means running the program on a single locale.
You could also use the Makefile to compile these programs all together:
linux> make hello1 hello2 hello3
linux> ./hello1 -nl 1
Hello, world!
…
2. A forth version, hello4.chpl, contains a configurable variable, message. Read, then compile and
run the program. Try changing the message through the command-line a couple of times:
linux> make hello4
linux> ./hello4 -nl 1
Hello, world!
linux> ./hello -nl 1 –message=”Hi!”
Hi!
3. The pair of files, hello.chpl and hello-main.chpl, contain a split version: one file defines a
module, the other uses it. Again, read, then compile and run the program.
4. Finally, there are three task-based versions of the Hello-World program: task[123].chpl. Run
these programs and see if you obverse concurrency.
2. Domains and Arrays
1. The files, domain1.chpl and domain2.chpl, contains some domain-related code. Read the code
carefully; pay attention to the connection between array a and domain D. Compile and run the programs; notice how the changes on domain D affect array a.
Change the program whatever way you want and see the results.
2. The file mmul.c contains a matrix multiplication program in C. Create a Chapel version of this
program. Parallelizing as much as you can.
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3. Deposit/Withdraw Program
The file bank.c is the same as you saw in Lab 5; it contains a sequential program performing simple deposit
and withdraw operations on a bank account. Convert this program into two versions of Chapel program.
1. A sequential version, bank1.chpl. The five constants should be converted to configurable runtime
constants, i.e. config const. To generate a random number, use the Random module. A sample is
given below:
use Random;
var rs = new RandomStream(uint); // create a random stream of unsigned int
var val = rs.getNext(); // get a random unsigned int
The C formatted print statement printf can be converted to writef in Chapel almost without
change, except that the integer control string is “%i” instead of “%d”.
2. A parallel version, bank2.chpl. Convert both C for loops into Chapel forall loops, and make
further changes so that deposit and withdraw operations can interleave.
Compile and run your Chapel program to verify that they work as expected.
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