Greg,
I'm currently working on removing the 1 barrier for the some operations
(Test and Wait). It will get inside in few days. Anyway, the MPI standard
does not say that 1 is not a valid answer :)
Thanks,
george.
On Mon, 19 Sep 2005, Greg Watson wrote:
Yes, I found a bug in my code that was causing the problem. I was setting the
first argument of MPI_Testsome() to the number of outstanding sends, rather
than the total number of sends. It seems to be working now, though I notice
that MPI_Testsome() always returns 1 for count.
Thanks for your help,
Greg
On Sep 19, 2005, at 3:52 AM, George Bosilca wrote:
MPI_Testsome return MPI_UNDEFINED only when in the set of requests there
are no more active requests. Basically at this point the array of requests
(in your example) should contain only MPI_REQUEST_NULL. I check the
different possibilities inside, and I'm pretty confident that we are
correct from the MPI standard point of view. I run your test example and
the behaviour was correct. Moreover, it never miss one request.
Can you forward me your exact example to see what was wrong inside ?
Thanks,
george.
On Mon, 19 Sep 2005, George Bosilca wrote:
Guys I'll take care of that. When I was working on the examples for the
tutorial here at Euro PVM I notice a similar problem with MPI_Waitsome.
george.
On Sun, 18 Sep 2005, Jeff Squyres wrote:
Yes -- Tim, can you check? Sounds like something in the request
progress is not occurring correctly.
Thanks!
On Sep 18, 2005, at 5:59 PM, Greg Watson wrote:
Jeff,
Yes, count is 2, but completed returns 1 on the first call and -32766
on the second call. Sounds like this may be a bug?
Greg
On Sep 17, 2005, at 8:11 AM, Jeff Squyres wrote:
(composing this in an airport on Saturday; may not actually be sent
until Monday or so)
-32766 is Open MPI's value for MPI_UNDEFINED. This is what is
returned
when there are no active requests in the array that is passed to
MPI_TESTSOME (see MPI-1.1:.
Just to verify that this behavior isn't a bug, can you confirm some
things:
- is count > 1?
- if more than one request finished in that single call to
MPI_TESTSOME
where completed was returned with a value of 1 (e.g., multiple
requests
in your array turned into MPI_REQUEST_NULL), then this is a bug --
i.e., completed should return an accurate value.
On Sep 16, 2005, at 8:45 PM, Greg Watson wrote:
Just for a change, I don't have a build problem!
However, I have a question about the MPI_Testsome() call. I'm using
MPI_Testsome() to check the completion status of a number of
outstanding ISend() requests. I'm doing something like this:
int outstanding;
main()
{
tids = (int *)malloc(sizeof(int) * count);
stats = (MPI_Status *)malloc(sizeof(MPI_Status) * count);
reqs = (MPI_Request *) malloc(sizeof(MPI_Request) * count)
do_sends();
outstanding = count;
while (outstanding > 0)
check_completed();
}
do_sends()
{
for (i = 0; i < count; i++)
MPI_ISend(buf, len, MPI_CHAR, i, 0, MPI_COMM_WORLD, &reqs
[i]);
}
check_completed()
{
int completed;
if (MPI_Testsome(count, reqs, &completed, tids, stats) !=
MPI_SUCCESS) {
printf("error in testsome\n");
exit(1);
}
outstanding -= completed;
}
The thing is, MPI_Testsome() returns with completed = 1 the first
time I call it, then completed = -32766 the second time I call it. It
always returns MPI_SUCCESS though.
Does anyone know what's going on? Am I doing something dumb?
Thanks,
Greg
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