i wait so much because of loops

[Luc Pattyn]

you're right, I replaced k's by j's, it should have been the other way around. Sorry for that. :)

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[karayel_kara]

hi ,i modified my code folowing that, but i get some error folowing code running ! double[,] a, b, c; a = new double[2000, 2000]; b=new double[2000,2000]; c=new double[2000,2000]; int s = 2000; Parallel.For(0, s, delegate(int i) { for (int j = 0; j < s; j++) { double v = 0; for (int k = 0; k < s; k++) { v += a[i, k] * b[k, j]; } c[i, j] = v; } }); bu my code isn't run :( Parallel.For(0, nrons, delegate(int k) { for (i = 0; i < nrons; i++) for (j = 0; j < nrons; j++) //G[i, j] = Math.Min(G[i, j], G[i, k] + G[k, j]); if (G[i, j]> (G[i, k] + G[k, j]) ) G[i, j] =(G[i, k] + G[k, j]) ; } ); why did i get error ?

[Luc Pattyn]

karayel_kara wrote:

my code isn't run

is not informative. does it compile? if not, what is the first error? does it run? if not, what is the first exception, with all the details? and at what line is it pointing? anyway, your code looks all wrong. You now have three arrays. Why? You don't initialize the arrays. I see six for loops, you only need three. And the way I understand the algorithm you can not possibly run the outer loop in parallel (that was the essence of my comment to Pete too). And please, please, please, please, please, please, show code in PRE tags, not in CODE tags. Final remark: when all you do to the algorithm is run it in parallel, the best you can hope for is to get it N times faster, with N the number of cores, say 4. That is something, but not much. And there are no guarantees. My first experiment did run 5 times slower, because it trashed the caches all the time! (and I'm afraid that will be true for your app too). :)

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