i think your not getting my problem.. ill try to explain myself better:
the MPI_Ipost is not working the way its suppose to... for instance,
in my example, i send n1 a msg from n0 (input by stdin)... while n1
keep pooling the msg buffer (by probing it, nonblocking) until it says
n1 got a message to receive... them, he receives, print it and
exits....
what is happening right now is the probe never returns TRUE (i mean
its flag, not the return itself wich is always MPI_SUCCESS), even
tough i use the blocking send on the n0 (and this blocking send goes
normally as well)... so, the real question comes now: am i using probe
correctly? i also tried pooling with the unsync receive, but the
result is the same...
ty in advance...
On 7/4/05, David Cronk <cronk_at_[hidden]> wrote:
> This really doesn't seem like a LAM specific situation, so I am reluctant to
> continue in this forum. The usenet group comp.parallel.mpi is a good source
> for general MPI questions.
>
> The only other thing I see right now is I don't see where TAG is defined.
> Make sure TAG has the same value for both sender and receiver.
>
> Dave.
>
>
> Marcelo Fukushima wrote:
> ok ty didnt realise that... but it aint working still...
On 7/4/05, David
> Cronk <cronk_at_[hidden]> wrote:
> You are sending from rank 0 to rank 0. You need to send to rank
> 1.
Dave.
Marcelo Fukushima wrote:
> hello guys!!! another noobish question...
im trying the simplest of all
> non-blocking routine and it simply locks up...
int main(int argc, char*
> argv[]) {
MPI_Request req;
MPI_Status status;
int size, rank;
int num,
> flag;
int i;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD,
> &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
printf ("starting
> waiting....\n");
if (rank == 1) {
//MPI_Irecv (&num, 1, MPI_INT,
> MPI_ANY_SOURCE, TAG,MPI_COMM_WORLD, &req);
//flag = 0;
//while (!flag){
> MPI_Irecv (&num, 1, MPI_INT, MPI_ANY_SOURCE, TAG,MPI_COMM_WORLD, &req);
> MPI_Wait (&req, &status);
printf ("Received: %d\n", num);
}
else if (rank
> == 0) {
num= 123;
scanf ("%d", &num);
printf ("Sending %d\n", num);
> MPI_Send (&num, 1, MPI_INT, 0,TAG, MPI_COMM_WORLD);
}
printf ("%d is
> saying bye...\n", rank);
MPI_Finalize();
return
> 0;
---------------------------
bottom line is: im posting a receive without
> the sender has sent the
msg and it stucks... i also tried pooling the
> receive post with the
MPI_Test and also locks (the request never turn into a
> completed
one)... so, in more general words, what i want to do is a
> "preemptive"
check if there was any msg sent to this node... is there a way?
> cuz i
didnt find on the tutorials.... ty in advance
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--
[]'s
Marcelo Takeshi Fukushima
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