Konstantina Panagiotopoulou <kwno...@hotmail.com> wrote on 06/12/2014
05:50:41 PM:
>
> Hello Dave,
>
> I am trying to use my Mpz type inside a collective finish.
> I have added a MulReducer<T> struct in Reducible.x10
> but my program is failing either silently or with "Place 0 exited
> unexpectedly with signal: Segmentation fault"
>
> Here is a summary of the code:
>
> val finalSum = finish(myMulReducer()){
> ateach (z in D_Base) {
> //calculate myFact - partial factorial in this place
> offer myFact; //******failing here
> }
> };
> return finalSum;
> //......
>
> static struct myMulReducer implements Reducible[Mpz] {
> public def zero() = Mpz(0);
> public operator this(a:Mpz, b:Mpz) = (a * b);
> }
>
> Is the offer causing the problem? Also tried to write partial
> results in a DistArray and used reduce function, in which case I get
> a Termination error
>
Hi,
I guess the first thing to check is that there isn't some
compiler/runtime bug or bad interaction with invoking the () operator on
myMulReducer.
If you write a simpler program that creates a myMulReducer and
invokes () a few times, does it get the right answer or crash?
Some snippet like:
val red:Reducible[Mpz] = myMulReducer();
val v1 = Mpz(10);
val v2 = Mpz(20);
val v3 = myMulReducer(v1,v2);
might be enough to test basic functionality and see if you can get a
crash in a simpler piece of code.
--dave------------------------------------------------------------------------------
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