Author: Remi Meier
Branch: c7
Changeset: r703:852f9a4772d4
Date: 2014-02-05 13:02 +0100
http://bitbucket.org/pypy/stmgc/changeset/852f9a4772d4/
Log: add parallel version of n-queens
diff --git a/duhton/demo/nqueens.duh b/duhton/demo/nqueens.duh
--- a/duhton/demo/nqueens.duh
+++ b/duhton/demo/nqueens.duh
@@ -3,13 +3,33 @@
-(setq count (container 0))
(defun abs (i)
(if (<= 0 i)
i
(- 0 i)))
+(defun clean_list (n)
+ (setq i n)
+ (setq res (list))
+ (while (> i 0)
+ (append res 0)
+ (setq i (- i 1))
+ )
+ res
+ )
+
+(defun copy_list (xs)
+ (setq res (list))
+ (setq idx 0)
+ (while (< idx (len xs))
+ (append res (get xs idx))
+ (setq idx (+ idx 1))
+ )
+ res
+ )
+
+
(defun attacks (hist col i j)
(|| (== (get hist j) i)
(== (abs (- (get hist j) i))
@@ -38,11 +58,11 @@
)
)
-(defun solve (n col hist)
+(defun solve (n col hist count)
(if (== col n)
(progn
(set count (+ (get count) 1))
- (print_solution hist n)
+ ;; (print_solution hist n)
)
;; else
@@ -57,7 +77,7 @@
(if (>= j col)
(progn
(set hist col i)
- (solve n (+ col 1) hist)
+ (solve n (+ col 1) hist count)
))
(setq i (+ i 1))
@@ -66,20 +86,63 @@
)
+(defun solve_parallel (n col hist count)
+ (if (== col n)
+ (progn
+ (set count (+ (get count) 1))
+ ;; (print_solution hist n)
+ )
-(defun clean_list (n)
- (setq i n)
- (setq res (list))
- (while (> i 0)
- (append res 0)
- (setq i (- i 1))
+ ;; else
+ (setq i 0)
+ (setq transaction-limit 1)
+ (if (== col transaction-limit)
+ (setq counts (list)))
+
+ (while (< i n)
+ (setq j 0)
+ (while (&& (< j col)
+ (not (attacks hist col i j)))
+ (setq j (+ j 1))
+ )
+
+ (if (>= j col)
+ (progn
+ (set hist col i)
+ (if (== col transaction-limit)
+ (progn
+ (setq new_cont (container 0))
+ (append counts new_cont)
+ (transaction solve n (+ col 1) (copy_list hist) new_cont)
+ )
+ (solve_parallel n (+ col 1) hist count)
+ )
+ )
+ )
+ ;; iterator
+ (setq i (+ i 1))
+ )
+
+ (if (== col transaction-limit)
+ (progn
+ (run-transactions)
+ (setq i 0)
+ (while (< i (len counts))
+ (set count (+ (get count) (get (get counts i))))
+ (setq i (+ i 1))
+ )
+ )
+ )
)
- res
)
-(setq n 8)
-(solve n 0 (clean_list n))
+
+
+(setq count (container 0))
+
+(setq n 11)
+(solve_parallel n 0 (clean_list n) count)
(print (quote solutions:) (get count))
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