https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85649
Bug ID: 85649
Summary: [og7, nvptx, openacc] Too much workers chosen for
launch
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
On the og7 branch for Titan V, we run into this error message in testsuite
polybench for testcases covariance and lu:
...
libgomp: The Nvidia accelerator has insufficient resources to launch
'x$_omp_fn$0' with num_workers = 27 and vector_length = 32; recompile the
program with 'num_workers = x and vector_length = y' on that offloaded region
or '-fopenacc-dim=-:x:y' where x * y <= 768.
...
The problem here is that num_workers is chosen by libgomp, and instead of
giving the error, it should reduce the num_workers.
