Benchtests: Remove broken walk benchmarks

The walk benchmarks don't measure anything useful - memory is not initialized
properly so doing a single walk in 32MB just measures reading the 4KB zero
page for reads and clear_page overhead for writes.  The memset variants don't
even manage to do a walk in the 32MB region due to using incorrect pointer
increments...  Neither is it clear why it is walking backwards since this
won't confuse modern prefetchers.  If you fix the benchmark and print the
bandwidth, the results are identical for all sizes larger than ~1KB since it
is just testing memory bandwidth of a single 32MB block.  This case is already
tested by the large benchmark, so overall it doesn't seem useful to keep these.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 0 insertions, 143 deletions

diff --git a/benchtests/bench-bzero-walk.c b/benchtests/bench-bzero-walk.c
deleted file mode 100644
index 48df0d77c3..0000000000
--- a/benchtests/bench-bzero-walk.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/* Measure memset function throughput with large data sizes.
-   Copyright (C) 2017-2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define TEST_MAIN
-#ifdef DO_MEMSET
-# define TEST_NAME "memset"
-#else
-# define TEST_NAME "bzero"
-#endif
-#define START_SIZE 128
-#define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
-#define TIMEOUT (20 * 60)
-#include "bench-string.h"
-
-#include "json-lib.h"
-
-#ifdef DO_MEMSET
-void *generic_memset (void *, int, size_t);
-
-typedef void *(*proto_t) (void *, int, size_t);
-
-IMPL (memset, 1)
-IMPL (generic_memset, 0)
-
-#else
-static void
-memset_zero (void * s, size_t len)
-{
-  memset (s, '\0', len);
-}
-
-typedef void (*proto_t) (void *, size_t);
-
-IMPL (bzero, 1)
-IMPL (memset_zero, 0)
-#endif
-
-static void
-do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
-	     size_t n)
-{
-  size_t i, iters = MIN_PAGE_SIZE / n;
-  timing_t start, stop, cur;
-
-  TIMING_NOW (start);
-  for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
-#ifdef DO_MEMSET
-    CALL (impl, s, 0, n);
-#else
-    CALL (impl, s, n);
-#endif
-  TIMING_NOW (stop);
-
-  TIMING_DIFF (cur, start, stop);
-
-  /* Get time taken per function call.  */
-  json_element_double (json_ctx, (double) cur / i);
-}
-
-static void
-do_test (json_ctx_t *json_ctx, size_t len)
-{
-  json_element_object_begin (json_ctx);
-  json_attr_uint (json_ctx, "length", len);
-  json_array_begin (json_ctx, "timings");
-
-  FOR_EACH_IMPL (impl, 0)
-    {
-      do_one_test (json_ctx, impl, (CHAR *) buf1,
-		   (CHAR *) buf1 + MIN_PAGE_SIZE - len, len);
-      alloc_bufs ();
-    }
-
-  json_array_end (json_ctx);
-  json_element_object_end (json_ctx);
-}
-
-int
-test_main (void)
-{
-  json_ctx_t json_ctx;
-  size_t i;
-
-  test_init ();
-
-  json_init (&json_ctx, 0, stdout);
-
-  json_document_begin (&json_ctx);
-  json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
-
-  json_attr_object_begin (&json_ctx, "functions");
-  json_attr_object_begin (&json_ctx, TEST_NAME);
-  json_attr_string (&json_ctx, "bench-variant", "walk");
-
-  json_array_begin (&json_ctx, "ifuncs");
-  FOR_EACH_IMPL (impl, 0)
-    json_element_string (&json_ctx, impl->name);
-  json_array_end (&json_ctx);
-
-  json_array_begin (&json_ctx, "results");
-  for (i = 1; i <= 64; i++)
-    do_test (&json_ctx, i);
-
-  for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
-    {
-      do_test (&json_ctx, i);
-      do_test (&json_ctx, i + 1);
-    }
-
-  json_array_end (&json_ctx);
-  json_attr_object_end (&json_ctx);
-  json_attr_object_end (&json_ctx);
-  json_document_end (&json_ctx);
-
-  return ret;
-}
-
-#include <support/test-driver.c>
-
-#ifdef DO_MEMSET
-# define libc_hidden_builtin_def(X)
-# define libc_hidden_def(X)
-# define libc_hidden_weak(X)
-# define weak_alias(X,Y)
-# undef MEMSET
-# define MEMSET generic_memset
-# include <string/memset.c>
-#endif