Also, it's been a long time since I've done anything serious in C++,
but are you guaranteed that &foo[x] for a vector<> will yield
contiguous memory?
You might be better off using the Boost C++ MPI bindings; they provide
all kinds of nifty things for classes, etc.
On Apr 7, 2008, at 7:47 AM, Andreas Schäfer wrote:
Hi Albert,
On 10:13 Mon 07 Apr , Albert Babinskas wrote:
Some code for the error that i get:
[snip]
class Box has two int array inside it like
int a[3];
int b[3];
Sorry, but "has two int array inside it like" isn't very precise. Do
you mean:
class Box {
int a[3];
int b[3];
};
or might you also mean:
class Box {
int a[3];
Foo aLotOf;
Bar otherStuff;
int b[3];
};
?
Anyways, your MPI_Datatype construction doesn't seem to be right:
MPI_Type_contiguous(9, MPI_INT, &MPI_box);
Fist of all, you should be using MPI_Type_create_struct for C++
classes in order to ensure that each member is addressed with its
correct offset (b/c of compiler memory layout/alignment). And second
you said that myclass/Box or whatever is build from two int[3], but in
the code above you register 9 ints.
Again, we can't help you if you don't provide us with self-sufficient
code; small excerpts mixed with comments won't cut it in most cases.
Cheers
-Andreas
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