I think we are almost saying the same thing. But to be sure, I will
restate. The call to opal_pointer_array_add() can return either an index
(which I assume is a positive integer, maybe also 0?) or
OPAL_ERR_OUT_OF_RESOURCE (which is a -2) if it cannot malloc anymore
space in the table. So, I guess I agree that the original code was
wrong as it never would have detected the error since OMPI_ERROR !=
OPAL_ERR_OUT_OF_RESOURCE. (-1 != -2)
Since we are overloading the return value, it seems like the only thing
we could do is something like this:
if (new_group->grp_f_to_c_index < 0)
error();
But that does not follow the SOS logic as the key is that we want to
compare to OMPI_SUCCESS (I think). Also, for what it is worth, the
setting of the grp_f_to_c_index happens in the group constructor, so we
cannot get at the return value of opal_pointer_array_add() except by
looking at the grp_f_to_c value after the object is constructed. I am
not sure the correct way to handle this.
Rolf
On 05/18/10 14:02, Jeff Squyres wrote:
Looks like the comparison to OMPI_ERROR worked by accident -- just because it happened to have a value of -1.
The *_f_to_c_index values are the return value from a call to
opal_point_array_add(). This value will either be non-negative or -1. -1
indicates a failure. It's not an *_ERR_* code -- it's a -1 index value. So
the comparisons should really have been to -1 in the first place.
Rolf / Abhishek -- can you fix? Did this happen in other *_f_to_c_index member
variable comparisons elsewhere?
On May 18, 2010, at 1:25 PM, Rolf vandeVaart wrote:
I am getting SEGVs while running the IMB-MPI1 tests. I believe the
problem has to do with changes made to the group_init.c file last
night. The error occurs in the call to MPI_Comm_split.
There were 4 changes in the file that look like this:
OLD:
if (OMPI_ERROR == new_group->grp_f_to_c_index)
NEW:
if (OMPI_SUCCESS != new_group->grp_f_to_c_index)
If I change it back, things work. I understand the idea of changing the
logic, but maybe that does not apply in this case? When running with
np=2, the value of new_group->grp_f_to_c_index is 4, thereby not
equaling OMPI_SUCCESS and we end up in an error condition which results
in a null pointer later on.
Am I the only that has run into this?
Rolf
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