diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c
new file mode 100644
index 2ea2216..25b9eba
*** a/src/backend/storage/ipc/shmem.c
--- b/src/backend/storage/ipc/shmem.c
*************** ShmemInitStruct(const char *name, Size s
*** 413,418 ****
--- 413,419 ----
  							" \"%s\" (%zu bytes requested)",
  							name, size)));
  		}
+ 		fprintf(stderr, "64-byte shared memory alignment of %s:  %d\n", name, ((int64)structPtr % 64) == 0);
  		result->size = size;
  		result->location = structPtr;
  	}