diff options
Diffstat (limited to 'benchtests')
| -rw-r--r-- | benchtests/Makefile | 2 | ||||
| -rw-r--r-- | benchtests/bench-memset-walk.c | 138 |
2 files changed, 139 insertions, 1 deletions
diff --git a/benchtests/Makefile b/benchtests/Makefile index d086cc671f..5a07639994 100644 --- a/benchtests/Makefile +++ b/benchtests/Makefile @@ -38,7 +38,7 @@ string-benchset := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \ strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \ strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \ strcoll memcpy-large memcpy-random memmove-large memset-large \ - memcpy-walk + memcpy-walk memset-walk # Build and run locale-dependent benchmarks only if we're building natively. ifeq (no,$(cross-compiling)) diff --git a/benchtests/bench-memset-walk.c b/benchtests/bench-memset-walk.c new file mode 100644 index 0000000000..59d2626f46 --- /dev/null +++ b/benchtests/bench-memset-walk.c @@ -0,0 +1,138 @@ +/* Measure memset function throughput with large data sizes. + Copyright (C) 2017 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 + <http://www.gnu.org/licenses/>. */ + +#define TEST_MAIN +#ifndef WIDE +# define TEST_NAME "memset" +#else +# define TEST_NAME "wmemset" +#endif /* WIDE */ +#define START_SIZE (1) +#define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024) +#define TIMEOUT (20 * 60) +#include "bench-string.h" + +#ifndef WIDE +# define MEMSET memset +# define CHAR char +# define SIMPLE_MEMSET simple_memset +# define MEMCMP memcmp +#else +# include <wchar.h> +# define MEMSET wmemset +# define CHAR wchar_t +# define SIMPLE_MEMSET simple_wmemset +# define MEMCMP wmemcmp +#endif /* WIDE */ + +#include <assert.h> +#include "json-lib.h" + + +typedef CHAR *(*proto_t) (CHAR *, int, size_t); + +CHAR * +inhibit_loop_to_libcall +SIMPLE_MEMSET (CHAR *s, int c, size_t n) +{ + CHAR *r = s, *end = s + n; + while (r < end) + *r++ = c; + return s; +} + +IMPL (SIMPLE_MEMSET, 1) + +static void +do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end, + int c __attribute ((unused)), 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++, i++) + CALL (impl, s, c, n); + TIMING_NOW (stop); + + TIMING_DIFF (cur, start, stop); + + /* Get time taken per function call. */ + json_element_double (json_ctx, (double) cur * n / i); +} + +static void +do_test (json_ctx_t *json_ctx, int c, size_t len) +{ + json_element_object_begin (json_ctx); + json_attr_uint (json_ctx, "length", len); + json_attr_uint (json_ctx, "char", c); + 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, c, len); + realloc_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 = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) + /* Test length alignments from 0-16 bytes. */ + for (int j = 0; j < i && j < 16; j++) + do_test (&json_ctx, 65, i + j); + + for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) + for (int j = 0; j < i && j < 16; j++) + do_test (&json_ctx, 0, i + j); + + 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> |