Refactor the allocation such that we utilise just enough memory pressure
to invoke the shrinker, and just enough processes to spread across the
CPUs and contend on the shrinker.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
tests/i915/gem_shrink.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/tests/i915/gem_shrink.c b/tests/i915/gem_shrink.c
index dba62c8fa..fd75d9427 100644
--- a/tests/i915/gem_shrink.c
+++ b/tests/i915/gem_shrink.c
@@ -426,6 +426,7 @@ igt_main
int num_processes = 0;
igt_fixture {
+ const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
uint64_t mem_size = intel_get_total_ram_mb();
int fd;
@@ -434,13 +435,13 @@ igt_main
/*
* Spawn enough processes to use all memory, but each only
- * uses half the available mappable aperture ~128MiB.
+ * uses half of the available per-cpu memory.
* Individually the processes would be ok, but en masse
* we expect the shrinker to start purging objects,
* and possibly fail.
*/
- alloc_size = gem_mappable_aperture_size() / 2;
- num_processes = 1 + (mem_size / (alloc_size >> 20));
+ alloc_size = mem_size / ncpus / 2;
+ num_processes = ncpus + (mem_size / (alloc_size >> 20));
igt_info("Using %d processes and %'lluMiB per process\n",
num_processes, (long long)(alloc_size >> 20));
--
2.29.2
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
