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*The begin statement spawns a thread of execution that is independent of the current (main) thread of execution.
writeln("1: ### The begin statement ###");
begin writeln("1: output from spawned task");
*The cobegin statement can be used to spawn a block of tasks, one for each statement.
writeln("2: ### The cobegin statement ###");
}
}
This procedure writes a square array out to a file.
proc writeSquareArray(n, X, filename) {
// Create and open an output file with the specified filename in write mode.
var outfile = open(filename, iomode.cw);
var writer = outfile.writer();
// Write the problem size in each dimension to the file.
writer.writeln(n, " ", n);
// Write out the array itself.
writer.write(X);
// Close the file.
writer.close();
outfile.close();
}
This procedure reads a new array out of a file and returns it.
proc readArray(filename) {
// Open an input file with the specified filename in read mode.
var infile = open(filename, iomode.r);
var reader = infile.reader();
// Read the number of rows and columns in the array in from the file.
var m = reader.read(int),
n = reader.read(int);
// Declare an array of the specified dimensions.
var X: [1..m, 1..n] real;
// Read in the array (row-major order is used for whole-array reads
// like this).
reader.read(X);
// Close the file.
reader.close();
infile.close();
// Return the array.
return X;
}
=== List ===
The Chapel List module provides the implementation of the list type. Lists are useful for building up and iterating over a collection of values in a structured manner.
private use List;
config const quiet: bool = false;
*The append() method appends the following element into the array.
*The sort() method sorts the list in ascending order.
*The pop() method pops the element at the specified index.
*The clear() clears all elements from the list.
*The indexOf() retrieves the index of the value specified, returns -1 if not found.
*The insert() method inserts the value at the specified index.
=== Timer ===
The Chapel allows user to use Timer from the timer module.
use Time;
/* Create a Timer t */
var t: Timer;
t.start();
writeln(“Operation start”);
sleep(5);
writeln(“Operation end”);
t.stop();
/* return time in milliseconds that was recorded by the timer */
writeln(t.elapsed(TimeUnits.milliseconds));
t.clear();
= Presentation =
*video: https://seneca-my.sharepoint.com/:v:/g/personal/lhuangtang_myseneca_ca/EWl4yNsl02ZGo-b2btiJO8kBNQ_yR2WF124CGAvtbQB0dQ?e=2CD3TR
*PowerPoint: https://docs.google.com/presentation/d/1ZIANDNRD1rRb_WYuBxX2kxDzAqaIm_kI/edit?usp=sharing&ouid=117424265169520381830&rtpof=true&sd=true
= Reference =