[og12] Force '--param openacc-kernels=parloops' in 'libgomp.oacc-c-c++-common/abort-3.c'
Commit Message
Hi!
Not sure what's going on, but until we get to look into that, I've pushed
to devel/omp/gcc-12 commit 9dde5e1fd14eb336afe161c0b43c74b522e20f3e
"Force '--param openacc-kernels=parloops' in 'libgomp.oacc-c-c++-common/abort-3.c'",
see attached.
Grüße
Thomas
-----------------
Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955
From 9dde5e1fd14eb336afe161c0b43c74b522e20f3e Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Tue, 17 Jan 2023 09:56:15 +0100
Subject: [PATCH] Force '--param openacc-kernels=parloops' in
'libgomp.oacc-c-c++-common/abort-3.c'
libgomp/
* testsuite/libgomp.oacc-c-c++-common/abort-3.c: Force
'--param openacc-kernels=parloops'.
---
libgomp/ChangeLog.omp | 3 +
.../libgomp.oacc-c-c++-common/abort-3.c | 57 +++++++++++++++++++
2 files changed, 60 insertions(+)
@@ -1,5 +1,8 @@
2023-01-20 Thomas Schwinge <thomas@codesourcery.com>
+ * testsuite/libgomp.oacc-c-c++-common/abort-3.c: Force
+ '--param openacc-kernels=parloops'.
+
* testsuite/libgomp.c/simd-math-1.c: Fix configuration.
2023-01-19 Tobias Burnus <tobias@codesourcery.com>
@@ -1,4 +1,61 @@
/* { dg-do run } */
+/* This test case is meant to 'abort' in device execution, which works as
+ expected with '--param openacc-kernels=parloops':
+
+ GCN:
+
+ GCN Kernel Aborted
+
+ nvptx:
+
+ libgomp: cuStreamSynchronize error: unspecified launch failure (perhaps abort was called)
+
+ ..., or:
+
+ libgomp: cuStreamSynchronize error: an illegal instruction was encountered
+
+ However, with '--param openacc-kernels=decompose', for '-O0', '-O1', this
+ does *not* 'abort' in device execution, but instead we run into whatever the
+ compiler generates for (implicit) host-side '__builtin_unreachable ()':
+
+ Segmentation fault (core dumped)
+
+ ..., or:
+
+ Illegal instruction (core dumped)
+
+ (This, unfortunately, still means "correct" execution of this test case...)
+
+ And, with '--param openacc-kernels=decompose', with '-O2' and higher, we
+ get things like the following:
+
+ GCN:
+
+ libgomp: Called kernel must be initialized
+
+ ..., potentially followed by:
+
+ libgomp: Duplicate node
+ WARNING: program timed out.
+
+ nvptx:
+
+ libgomp: cuModuleLoadData error: unspecified launch failure
+
+ ..., or:
+
+ libgomp: cuModuleLoadData error: an illegal instruction was encountered
+
+ That is, for nvptx, the code doesn't even load?
+
+ Worse, on one system, this process then shows 100 % CPU utilization, GPU
+ locks up; process un-SIGKILLable, system needs to be (forcefully) rebooted.
+
+ Until we understand what's happening (how the decomposed OpenACC 'kernels'
+ code is different from 'abort-1.c', for example), play it safe:
+
+ { dg-additional-options {--param openacc-kernels=parloops} }
+*/
#include <stdio.h>
#include <stdlib.h>
--
2.25.1