The following loop, which seems valid according to the OpenMP specification
v2.5 and 3.0 fails to terminate:
int x;
#pragma omp parallel for schedule(guided)
for(x = 3; x < 478; x += 2) {
...
}
I've tested with two and eight threads and different chunksizes, with the same
non-termination result. Changing the upper bound to 477, however, makes the
loop terminate, which leads me to belive this is an issue in the GNU OpenMP
runtime library.
I have confirmed that the problems exists in 4.2, 4.3 and 4.5 (trunk,
19-06-09). To me, bug 35625 seems somewhat similar but was supposedly fixed in
4.3.
/Per
--
Summary: omp for loop with guided schedule fails to terminate in
certain cases
Product: gcc
Version: 4.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: per at bitempire dot com
GCC build triplet: i686-pc-linux
GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40494
