[libgomp, testsuite] Scale down some OpenACC test-cases

When a display manager is running on an nvidia card, all CUDA kernel launches
get a 5 seconds watchdog timer.

Consequently, when running the libgomp testsuite with nvptx accelerator and
GOMP_NVPTX_JIT=-O0 we run into a few FAILs like this:
...
libgomp: cuStreamSynchronize error: the launch timed out and was terminated
FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/parallel-dims.c \
  -DACC_DEVICE_TYPE_nvidia=1 -DACC_MEM_SHARED=0 -foffload=nvptx-none -O0 \
  execution test
...

Fix this by scaling down the failing test-cases by default, and reverting to
the original behaviour for GCC_TEST_RUN_EXPENSIVE=1.

Tested on x86_64-linux with nvptx accelerator.

libgomp/ChangeLog:

2022-03-25  Tom de Vries  <tdevries@suse.de>

	PR libgomp/105042
	* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Reduce
	execution time.
	* testsuite/libgomp.oacc-c-c++-common/vred2d-128.c: Same.
	* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Same.

3 files changed, 46 insertions, 23 deletions

diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-dims.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-dims.c
index b1cfe37..6798e23 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-dims.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-dims.c
@@ -1,6 +1,8 @@
 /* OpenACC parallelism dimensions clauses: num_gangs, num_workers,
    vector_length.  */
 
+/* { dg-additional-options "-DEXPENSIVE" { target run_expensive_tests } } */
+
 /* { dg-additional-options "--param=openacc-kernels=decompose" } */
 
 /* { dg-additional-options "-fopt-info-all-omp" }
@@ -49,6 +51,11 @@ static int acc_vector ()
   return __builtin_goacc_parlevel_id (GOMP_DIM_VECTOR);
 }
 
+#ifdef EXPENSIVE
+#define N 100
+#else
+#define N 50
+#endif
 
 int main ()
 {
@@ -76,7 +83,7 @@ int main ()
     {
       /* We're actually executing with num_gangs (1).  */
       gangs_actual = 1;
-      for (int i = 100 * gangs_actual; i > -100 * gangs_actual; --i)
+      for (int i = N * gangs_actual; i > -N * gangs_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -115,7 +122,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC gang loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * gangs_actual; i > -100 * gangs_actual; --i)
+      for (int i = N * gangs_actual; i > -N * gangs_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -154,7 +161,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC worker loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * workers_actual; i > -100 * workers_actual; --i)
+      for (int i = N * workers_actual; i > -N * workers_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -200,7 +207,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC vector loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * vectors_actual; i > -100 * vectors_actual; --i)
+      for (int i = N * vectors_actual; i > -N * vectors_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -250,7 +257,7 @@ int main ()
 	}
       /* As we're executing GR not GP, don't multiply with a "gangs_actual"
 	 factor.  */
-      for (int i = 100 /* * gangs_actual */; i > -100 /* * gangs_actual */; --i)
+      for (int i = N /* * gangs_actual */; i > -N /* * gangs_actual */; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -291,7 +298,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC gang loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * gangs_actual; i > -100 * gangs_actual; --i)
+      for (int i = N * gangs_actual; i > -N * gangs_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -348,7 +355,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC worker loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * workers_actual; i > -100 * workers_actual; --i)
+      for (int i = N * workers_actual; i > -N * workers_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -411,7 +418,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC worker loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * workers_actual; i > -100 * workers_actual; --i)
+      for (int i = N * workers_actual; i > -N * workers_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -468,7 +475,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC vector loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * vectors_actual; i > -100 * vectors_actual; --i)
+      for (int i = N * vectors_actual; i > -N * vectors_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -528,7 +535,7 @@ int main ()
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC vector loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * vectors_actual; i > -100 * vectors_actual; --i)
+      for (int i = N * vectors_actual; i > -N * vectors_actual; --i)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -602,20 +609,20 @@ int main ()
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-note {variable 'j' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC gang loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100 * gangs_actual; i > -100 * gangs_actual; --i)
+      for (int i = N * gangs_actual; i > -N * gangs_actual; --i)
 #pragma acc loop /* { dg-line l_loop_j[incr c_loop_j] } */ \
   worker \
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
 	/* { dg-note {variable 'j' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_j$c_loop_j } */
 	/* { dg-note {variable 'k' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_j$c_loop_j } */
 	/* { dg-optimized {assigned OpenACC worker loop parallelism} {} { target *-*-* } l_loop_j$c_loop_j } */
-	for (int j = 100 * workers_actual; j > -100 * workers_actual; --j)
+	for (int j = N * workers_actual; j > -N * workers_actual; --j)
 #pragma acc loop /* { dg-line l_loop_k[incr c_loop_k] } */ \
   vector \
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
 	  /* { dg-note {variable 'k' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_k$c_loop_k } */
 	  /* { dg-optimized {assigned OpenACC vector loop parallelism} {} { target *-*-* } l_loop_k$c_loop_k } */
-	  for (int k = 100 * vectors_actual; k > -100 * vectors_actual; --k)
+	  for (int k = N * vectors_actual; k > -N * vectors_actual; --k)
 	    {
 	      gangs_min = gangs_max = acc_gang ();
 	      workers_min = workers_max = acc_worker ();
@@ -664,7 +671,7 @@ int main ()
       /* { dg-note {variable 'i' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC seq loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100; i > -100; --i)
+      for (int i = N; i > -N; --i)
 	{
 	  /* This is to make the loop unparallelizable.  */
 	  asm volatile ("" : : : "memory");
@@ -714,7 +721,7 @@ int main ()
       /* { dg-note {variable 'i' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC seq loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100; i > -100; --i)
+      for (int i = N; i > -N; --i)
 	{
 	  /* This is to make the loop unparallelizable.  */
 	  asm volatile ("" : : : "memory");
@@ -745,7 +752,7 @@ int main ()
     /* { dg-note {variable 'i' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_compute$c_compute } */
     /* { dg-warning {using 'vector_length \(32\)', ignoring 1} {} { target openacc_nvidia_accel_selected } l_compute$c_compute } */
     {
-      for (int i = 100; i > -100; i--)
+      for (int i = N; i > -N; i--)
 	{
 	  gangs_min = gangs_max = acc_gang ();
 	  workers_min = workers_max = acc_worker ();
@@ -789,20 +796,20 @@ int main ()
       /* { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-note {variable 'j' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_i$c_loop_i } */
       /* { dg-optimized {assigned OpenACC gang loop parallelism} {} { target *-*-* } l_loop_i$c_loop_i } */
-      for (int i = 100; i > -100; i--)
+      for (int i = N; i > -N; i--)
 #pragma acc loop /* { dg-line l_loop_j[incr c_loop_j] } */ \
   worker \
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
 	/* { dg-note {variable 'j' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_j$c_loop_j } */
 	/* { dg-note {variable 'k' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_j$c_loop_j } */
 	/* { dg-optimized {assigned OpenACC worker loop parallelism} {} { target *-*-* } l_loop_j$c_loop_j } */
-	for (int j = 100; j > -100; j--)
+	for (int j = N; j > -N; j--)
 #pragma acc loop /* { dg-line l_loop_k[incr c_loop_k] } */ \
   vector \
   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
 	  /* { dg-note {variable 'k' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} {} { target *-*-* } l_loop_k$c_loop_k } */
 	  /* { dg-optimized {assigned OpenACC vector loop parallelism} {} { target *-*-* } l_loop_k$c_loop_k } */
-	  for (int k = 100 * vectors_actual; k > -100 * vectors_actual; k--)
+	  for (int k = N * vectors_actual; k > -N * vectors_actual; k--)
 	    {
 	      gangs_min = gangs_max = acc_gang ();
 	      workers_min = workers_max = acc_worker ();
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/vred2d-128.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/vred2d-128.c
index 489f26a..9c182d9 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/vred2d-128.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/vred2d-128.c
@@ -1,10 +1,16 @@
 /* Test large vector lengths.  */
 
+/* { dg-additional-options "-DEXPENSIVE" { target run_expensive_tests } } */
+
 /* { dg-additional-options -Wuninitialized } */
 
 #include <assert.h>
 
+#ifdef EXPENSIVE
 #define n 10000
+#else
+#define n 2500
+#endif
 int a1[n], a2[n];
 
 #define gentest(name, outer, inner)		\
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/parallel-dims.f90 b/libgomp/testsuite/libgomp.oacc-fortran/parallel-dims.f90
index cd3f355..d2050e6 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/parallel-dims.f90
+++ b/libgomp/testsuite/libgomp.oacc-fortran/parallel-dims.f90
@@ -5,6 +5,9 @@
 ! { dg-do run }
 ! { dg-prune-output "command-line option '-fintrinsic-modules-path=.*' is valid for Fortran but not for C" }
 
+! { dg-additional-options "-DEXPENSIVE" { target run_expensive_tests } }
+! { dg-additional-options "-cpp" }
+
 ! { dg-additional-options "-fopt-info-note-omp" }
 ! { dg-additional-options "--param=openacc-privatization=noisy" }
 ! { dg-additional-options "-foffload=-fopt-info-note-omp" }
@@ -44,6 +47,13 @@ program main
   integer :: vectors_actual
   integer :: i, j, k
 
+
+#ifdef EXPENSIVE
+  integer, parameter :: N = 100
+#else
+  integer, parameter :: N = 50
+#endif
+
   call acc_init (acc_device_default)
 
   ! OpenACC parallel construct.
@@ -69,7 +79,7 @@ program main
   !$acc serial &
   !$acc   reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max) ! { dg-warning "using .vector_length \\(32\\)., ignoring 1" "" { target openacc_nvidia_accel_selected } }
   ! { dg-note {variable 'D\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } .-1 }
-  do i = 100, -99, -1
+  do i = N, -(N-1), -1
      gangs_min = acc_gang ();
      gangs_max = acc_gang ();
      workers_min = acc_worker ();
@@ -108,14 +118,14 @@ program main
   end if
   !$acc loop gang reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
   ! { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } .-1 }
-  do i = 100, -99, -1
+  do i = N, -(N-1), -1
      !$acc loop worker reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
      ! { dg-note {variable 'j' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } .-1 }
      ! { dg-note {variable 'D\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } .-2 }
-     do j = 100, -99, -1
+     do j = N, -(N-1), -1
         !$acc loop vector reduction (min: gangs_min, workers_min, vectors_min) reduction (max: gangs_max, workers_max, vectors_max)
         ! { dg-note {variable 'k' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } .-1 }
-        do k = 100 * vectors_actual, -99 * vectors_actual, -1
+        do k = N * vectors_actual, -(N-1) * vectors_actual, -1
            gangs_min = acc_gang ();
            gangs_max = acc_gang ();
            workers_min = acc_worker ();