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Regular reduction expressions parallelize too, so just use that.

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Danila Fedorin 2022-12-01 09:19:29 -08:00
parent cf78dc036c
commit 277d198d17
1 changed files with 11 additions and 23 deletions
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30
day1.chpl
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@ -114,10 +114,15 @@ class MaxThree : ReduceScanOp {
/* /*
Let's make it possible to select which part we want to solve from the Let's make it possible to select which part we want to solve from the
command line. This can be easily achieved via a `config const`. We'll command line. This can be easily achieved via a `config const`. A
also add a `config const` to enable/disable parallel computation. */ variable like this can be set when running the program from the command
line as follows:
```bash
./my-program --part=1
```
*/
config const part = 1; config const part = 1;
config const parallel = false;
/* Here's how we use our solution. */ /* Here's how we use our solution. */
if part == 1 { if part == 1 {
@ -125,25 +130,8 @@ if part == 1 {
the one maximum number. */ the one maximum number. */
writeln(max reduce elves()); writeln(max reduce elves());
} else if part == 2 { } else if part == 2 {
if !parallel {
/* For the non-parallel version, we can just use `MaxThree` in the
reduce expression, which gives us our top-3 tuple. To solve
the puzzle, all that's left is to sum the elements of that tuple,
which we achieve via another `+ reduce`. */
writeln(+ reduce (MaxThree reduce elves()));
} else {
/* For the parallel case, we have to use a `forall` loop, which is
Chapel's way of expressing parallelism. `forall` loops have
support for `reduce expression`. In all, the code looks like the
following. */
var max3 = (0,0,0);
// Need to read all the numbers into memory to make sure we can distribute // Need to read all the numbers into memory to make sure we can distribute
var elfList = elves(); var elfList = elves();
// To make a reduction parallel, we use a forall loop with a reduce intent writeln(+ reduce (MaxThree reduce elfList));
forall elf in elfList with (MaxThree(int) reduce max3) {
max3 reduce= elf;
}
writeln(+ reduce max3);
}
} }