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[libgomp, testsuite] Fix insufficient resources in test-cases 

When running libgomp test-case broadcast-many.c on an nvptx accelerator
(T400, driver version 470.86), I run into:
...
libgomp: The Nvidia accelerator has insufficient resources to launch \
  'main$_omp_fn$0' with num_workers = 32 and vector_length = 32; \
  recompile the program with 'num_workers = x and vector_length = y' on \
  that offloaded region or '-fopenacc-dim=❌y' where x * y <= 896.

FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/broadcast-many.c \
  -DACC_DEVICE_TYPE_nvidia=1 -DACC_MEM_SHARED=0 -foffload=nvptx-none  \
  -O0  execution test
...

The error does not occur when using GOMP_NVPTX_JIT=-O0.

Fix this by using 896 / 32 == 28 workers for ACC_DEVICE_TYPE_nvidia.

Likewise for some other test-cases.

Tested libgomp on x86_64 with nvptx accelerator.

libgomp/ChangeLog:

2022-01-27  Tom de Vries  <tdevries@suse.de>

	* testsuite/libgomp.oacc-c-c++-common/broadcast-many.c: Reduce
	num_workers for nvidia accelerator to fix libgomp error 'insufficient
	resources'.
	* testsuite/libgomp.oacc-c-c++-common/par-loop-comb-reduction-4.c:
	Same.
	* testsuite/libgomp.oacc-c-c++-common/reduction-7.c: Same.
This commit is contained in:
Tom de Vries 2022-01-23 06:29:58 +01:00
parent be362d5e12
commit d43fbc7d3f
3 changed files with 25 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
libgomp/testsuite/libgomp.oacc-c-c++-common/broadcast-many.c
View File

@ -5,6 +5,13 @@
#include <assert.h>
#include <stdio.h>
#if ACC_DEVICE_TYPE_nvidia
/* To avoid 'libgomp: The Nvidia accelerator has insufficient resources'. */
#define NUM_WORKERS 28
#else
#define NUM_WORKERS 32
#endif
#define LOCAL(n) double n = input;
#define LOCALS(n) LOCAL(n##1) LOCAL(n##2) LOCAL(n##3) LOCAL(n##4) \
LOCAL(n##5) LOCAL(n##6) LOCAL(n##7) LOCAL(n##8)
@ -23,7 +30,7 @@ int main (void)
int ret;
int input = 1;
#pragma acc parallel num_gangs(1) num_workers(32) copyout(ret)
#pragma acc parallel num_gangs(1) num_workers(NUM_WORKERS) copyout(ret)
{
int w = 0;
LOCALS2(h);

10
libgomp/testsuite/libgomp.oacc-c-c++-common/par-loop-comb-reduction-4.c
View File

@ -1,5 +1,12 @@
#include <assert.h>
#if ACC_DEVICE_TYPE_nvidia
/* To avoid 'libgomp: The Nvidia accelerator has insufficient resources'. */
#define NUM_WORKERS 24
#else
#define NUM_WORKERS 32
#endif
/* Test of reduction on both parallel and loop directives (workers and vectors
together in gang-partitioned mode, float type, multiple reductions). */
@ -13,7 +20,8 @@ main (int argc, char *argv[])
for (i = 0; i < 32768; i++)
arr[i] = i % (32768 / 64);
#pragma acc parallel num_gangs(32) num_workers(32) vector_length(32) \
#pragma acc parallel \
num_gangs(32) num_workers(NUM_WORKERS) vector_length(32) \
reduction(+:res) reduction(max:mres) copy(res, mres)
{
#pragma acc loop gang /* { dg-warning "nested loop in reduction needs reduction clause for 'm\?res'" "TODO" } */

9
libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-7.c
View File

@ -181,6 +181,12 @@ void gwv_np_3()
assert (res == hres);
}
#if ACC_DEVICE_TYPE_nvidia
/* To avoid 'libgomp: The Nvidia accelerator has insufficient resources'. */
#define NUM_WORKERS 28
#else
#define NUM_WORKERS 32
#endif
/* Test of reduction on loop directive (gangs, workers and vectors, multiple
non-private reduction variables, float type). */
@ -194,7 +200,7 @@ void gwv_np_4()
for (i = 0; i < 32768; i++)
arr[i] = i % (32768 / 64);
#pragma acc parallel num_gangs(32) num_workers(32) vector_length(32)
#pragma acc parallel num_gangs(32) num_workers(NUM_WORKERS) vector_length(32)
{
#pragma acc loop gang reduction(+:res) reduction(max:mres)
for (j = 0; j < 32; j++)
@ -235,6 +241,7 @@ void gwv_np_4()
assert (mres == hmres);
}
#undef NUM_WORKERS
/* Test of reduction on loop directive (vectors, private reduction
variable). */