[Openmp-commits] [PATCH] D119357: [Libomptarget] Increase stack size for bug49779 test

Joseph Huber via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Wed Feb 9 12:37:37 PST 2022

This revision was automatically updated to reflect the committed changes.
Closed by commit rG9582f0969041: [Libomptarget] Increase stack size for bug49779 test (authored by jhuber6).

  rG LLVM Github Monorepo




Index: openmp/libomptarget/test/offloading/bug49779.cpp
--- openmp/libomptarget/test/offloading/bug49779.cpp
+++ openmp/libomptarget/test/offloading/bug49779.cpp
@@ -1,8 +1,8 @@
-// RUN: %libomptarget-compilexx-run-and-check-aarch64-unknown-linux-gnu
-// RUN: %libomptarget-compilexx-run-and-check-powerpc64-ibm-linux-gnu
-// RUN: %libomptarget-compilexx-run-and-check-powerpc64le-ibm-linux-gnu
-// RUN: %libomptarget-compilexx-run-and-check-x86_64-pc-linux-gnu
-// RUN: %libomptarget-compilexx-run-and-check-nvptx64-nvidia-cuda
+// RUN: %libomptarget-compilexx-generic && \
+// RUN:   env LIBOMPTARGET_STACK_SIZE=2048 %libomptarget-run-generic
+// UNSUPPORTED: amdgcn-amd-amdhsa
+// UNSUPPORTED: amdgcn-amd-amdhsa-newDriver
 #include <cassert>
 #include <iostream>
Index: openmp/docs/SupportAndFAQ.rst
--- openmp/docs/SupportAndFAQ.rst
+++ openmp/docs/SupportAndFAQ.rst
@@ -313,3 +313,16 @@
 are C and C++ with Fortran support planned in the future. Compiler support is
 best for Clang but this module should work for other compiler vendors such as
+Q: What does 'Stack size for entry function cannot be statically determined' mean?
+This is a warning that the Nvidia tools will sometimes emit if the offloading
+region is too complex. Normally, the CUDA tools attempt to statically determine
+how much stack memory each thread. This way when the kernel is launched each
+thread will have as much memory as it needs. If the control flow of the kernel
+is too complex, containing recursive calls or nested parallelism, this analysis
+can fail. If this warning is triggered it means that the kernel may run out of
+stack memory during execution and crash. The environment variable
+``LIBOMPTARGET_STACK_SIZE`` can be used to increase the stack size if this

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