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cf97591313
memset with zero as the value to set is by far the majority value (99%+ for Python3 and GCC). Add bench-memset-zero-large.c, bench-memset-zero-walk.c and bench-memset-zero.c to measure memset implementations for zeroing. Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/* Measure bzero functions with large data sizes.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#ifdef DO_MEMSET
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# define TEST_NAME "memset"
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#else
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# define TEST_NAME "bzero"
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#endif
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#define START_SIZE (128 * 1024)
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#define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
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#define TIMEOUT (20 * 60)
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#include "bench-string.h"
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#include "json-lib.h"
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#ifdef DO_MEMSET
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void *generic_memset (void *, int, size_t);
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typedef void *(*proto_t) (void *, int, size_t);
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IMPL (memset, 1)
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IMPL (generic_memset, 0)
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#else
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static void
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memset_zero (void * s, size_t len)
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{
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memset (s, '\0', len);
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}
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typedef void (*proto_t) (void *, size_t);
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IMPL (bzero, 1)
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IMPL (memset_zero, 0)
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#endif
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
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{
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size_t i, iters = 16;
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timing_t start, stop, cur;
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TIMING_NOW (start);
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for (i = 0; i < iters; ++i)
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{
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#ifdef DO_MEMSET
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CALL (impl, s, 0, n);
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#else
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CALL (impl, s, n);
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#endif
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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json_element_double (json_ctx, (double) cur / (double) iters);
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}
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static void
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do_test (json_ctx_t *json_ctx, size_t align, size_t len)
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{
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align &= 63;
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if ((align + len) * sizeof (CHAR) > page_size)
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return;
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "length", len);
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json_attr_uint (json_ctx, "alignment", align);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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{
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do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, len);
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alloc_bufs ();
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}
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json_array_end (json_ctx);
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json_element_object_end (json_ctx);
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}
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int
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test_main (void)
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{
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json_ctx_t json_ctx;
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size_t i;
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test_init ();
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json_init (&json_ctx, 0, stdout);
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json_document_begin (&json_ctx);
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json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
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json_attr_object_begin (&json_ctx, "functions");
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json_attr_object_begin (&json_ctx, TEST_NAME);
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json_attr_string (&json_ctx, "bench-variant", "large");
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json_array_begin (&json_ctx, "ifuncs");
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FOR_EACH_IMPL (impl, 0)
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json_element_string (&json_ctx, impl->name);
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json_array_end (&json_ctx);
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json_array_begin (&json_ctx, "results");
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for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
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{
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do_test (&json_ctx, 0, i);
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do_test (&json_ctx, 3, i);
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}
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json_array_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_document_end (&json_ctx);
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return ret;
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}
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#include <support/test-driver.c>
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#ifdef DO_MEMSET
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# define libc_hidden_builtin_def(X)
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# define libc_hidden_def(X)
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# define libc_hidden_weak(X)
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# define weak_alias(X,Y)
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# undef MEMSET
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# define MEMSET generic_memset
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# include <string/memset.c>
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#endif
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