mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
benchtests: Add random memset benchmark
Add a new randomized memset test similar to bench-random-memcpy. Instead of repeating the same call to memset over and over again, it times a large number of different inputs. The distribution of memset length and alignment is based on SPEC2017 (length up to 4096 and alignment up to 64). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Wilco Dijkstra
parent
3dc426b642
commit
79e472f0f8
@ -153,6 +153,7 @@ string-benchset := \
|
||||
memrchr \
|
||||
memset \
|
||||
memset-large \
|
||||
memset-random \
|
||||
memset-zero \
|
||||
memset-zero-large \
|
||||
rawmemchr \
|
||||
|
||||
185
benchtests/bench-memset-random.c
Normal file
185
benchtests/bench-memset-random.c
Normal file
@ -0,0 +1,185 @@
|
||||
/* Measure memset performance.
|
||||
Copyright (C) 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 MIN_SIZE 32768
|
||||
#define MAX_SIZE (1024*1024)
|
||||
#define NUM_TESTS 16384
|
||||
|
||||
#define MIN_PAGE_SIZE (MAX_SIZE + getpagesize())
|
||||
#define TEST_MAIN
|
||||
#define TEST_NAME "memset"
|
||||
#include "bench-string.h"
|
||||
#include <assert.h>
|
||||
#include "json-lib.h"
|
||||
|
||||
typedef void *(*proto_t) (void *, int, size_t);
|
||||
|
||||
IMPL (MEMSET, 1)
|
||||
|
||||
typedef struct { uint32_t offset : 20, len : 12; } memset_test_t;
|
||||
static memset_test_t test_arr[NUM_TESTS];
|
||||
|
||||
typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
|
||||
typedef struct { uint8_t align; uint16_t freq; } align_data_t;
|
||||
|
||||
#define SIZE_NUM 65536
|
||||
#define SIZE_MASK (SIZE_NUM-1)
|
||||
static uint8_t len_arr[SIZE_NUM];
|
||||
|
||||
/* Frequency data for memset sizes up to 4096 bytes based on SPEC2017. */
|
||||
static freq_data_t memset_len_freq[] =
|
||||
{
|
||||
{40,28817}, {32,15336}, { 16,3823}, {296,3545}, { 24,3454}, { 8,1412},
|
||||
{292,1202}, { 48, 927}, { 12, 613}, { 11, 539}, {284, 493}, {108, 414},
|
||||
{ 88, 380}, { 20, 295}, {312, 271}, { 72, 233}, { 2, 200}, { 4, 192},
|
||||
{ 15, 180}, { 14, 174}, { 13, 160}, { 56, 151}, { 36, 144}, { 64, 140},
|
||||
{4095,133}, { 10, 130}, { 9, 124}, { 3, 124}, { 28, 120}, { 0, 118},
|
||||
{288, 110}, {1152, 96}, {104, 90}, { 1, 86}, {832, 76}, {248, 74},
|
||||
{1024, 69}, {120, 64}, {512, 63}, {384, 60}, { 6, 59}, { 80, 54},
|
||||
{ 17, 50}, { 7, 49}, {520, 47}, {2048, 39}, {256, 37}, {864, 33},
|
||||
{1440, 28}, { 22, 27}, {2056, 24}, {260, 23}, { 68, 23}, { 5, 22},
|
||||
{ 18, 21}, {200, 18}, {2120, 18}, { 60, 17}, { 52, 16}, {336, 15},
|
||||
{ 44, 13}, {192, 13}, {160, 12}, {2064, 12}, {128, 12}, { 76, 11},
|
||||
{164, 11}, {152, 10}, {136, 9}, {488, 7}, { 96, 6}, {560, 6},
|
||||
{1016, 6}, {112, 5}, {232, 5}, {168, 5}, {952, 5}, {184, 5},
|
||||
{144, 4}, {252, 4}, { 84, 3}, {960, 3}, {3808, 3}, {244, 3},
|
||||
{280, 3}, {224, 3}, {156, 3}, {1088, 3}, {440, 3}, {216, 2},
|
||||
{304, 2}, { 23, 2}, { 25, 2}, { 26, 2}, {264, 2}, {328, 2},
|
||||
{1096, 2}, {240, 2}, {1104, 2}, {704, 2}, {1664, 2}, {360, 2},
|
||||
{808, 1}, {544, 1}, {236, 1}, {720, 1}, {368, 1}, {424, 1},
|
||||
{640, 1}, {1112, 1}, {552, 1}, {272, 1}, {776, 1}, {376, 1},
|
||||
{ 92, 1}, {536, 1}, {824, 1}, {496, 1}, {760, 1}, {792, 1},
|
||||
{504, 1}, {344, 1}, {1816, 1}, {880, 1}, {176, 1}, {320, 1},
|
||||
{352, 1}, {2008, 1}, {208, 1}, {408, 1}, {228, 1}, {2072, 1},
|
||||
{568, 1}, {220, 1}, {616, 1}, {600, 1}, {392, 1}, {696, 1},
|
||||
{2144, 1}, {1280, 1}, {2136, 1}, {632, 1}, {584, 1}, {456, 1},
|
||||
{472, 1}, {3440, 1}, {2088, 1}, {680, 1}, {2928, 1}, {212, 1},
|
||||
{648, 1}, {1752, 1}, {664, 1}, {3512, 1}, {1032, 1}, {528, 1},
|
||||
{4072, 1}, {204, 1}, {2880, 1}, {3392, 1}, {712, 1}, { 59, 1},
|
||||
{736, 1}, {592, 1}, {2520, 1}, {744, 1}, {196, 1}, {172, 1},
|
||||
{728, 1}, {2040, 1}, {1192, 1}, {3600, 1}, {0, 0}
|
||||
};
|
||||
|
||||
#define ALIGN_NUM 1024
|
||||
#define ALIGN_MASK (ALIGN_NUM-1)
|
||||
static uint8_t align_arr[ALIGN_NUM];
|
||||
|
||||
/* Alignment data for memset based on SPEC2017. */
|
||||
static align_data_t memset_align_freq[] =
|
||||
{
|
||||
{16, 338}, {8, 307}, {32, 148}, {64, 131}, {4, 72}, {1, 23}, {2, 5}, {0, 0}
|
||||
};
|
||||
|
||||
static void
|
||||
init_memset_distribution (void)
|
||||
{
|
||||
int i, j, freq, size, n;
|
||||
|
||||
for (n = i = 0; (freq = memset_len_freq[i].freq) != 0; i++)
|
||||
for (j = 0, size = memset_len_freq[i].size; j < freq; j++)
|
||||
len_arr[n++] = size;
|
||||
assert (n == SIZE_NUM);
|
||||
|
||||
for (n = i = 0; (freq = memset_align_freq[i].freq) != 0; i++)
|
||||
for (j = 0, size = memset_align_freq[i].align; j < freq; j++)
|
||||
align_arr[n++] = size - 1;
|
||||
assert (n == ALIGN_NUM);
|
||||
}
|
||||
|
||||
static void
|
||||
do_one_test (json_ctx_t *json_ctx, impl_t *impl, size_t iters,
|
||||
memset_test_t *input, size_t n)
|
||||
{
|
||||
timing_t start, stop, cur;
|
||||
|
||||
/* Avoid 'cold start' performance penalty. */
|
||||
for (int j = 0; j < n; j++)
|
||||
CALL (impl, buf1 + input[j].offset, 0, input[j].len);
|
||||
|
||||
TIMING_NOW (start);
|
||||
for (int i = 0; i < iters; ++i)
|
||||
for (int j = 0; j < n; j++)
|
||||
CALL (impl, buf1 + input[j].offset, 0, input[j].len);
|
||||
TIMING_NOW (stop);
|
||||
TIMING_DIFF (cur, start, stop);
|
||||
json_element_double (json_ctx, (double) cur / (double) iters);
|
||||
}
|
||||
|
||||
static void
|
||||
do_test (json_ctx_t *json_ctx, size_t max_size)
|
||||
{
|
||||
int n;
|
||||
|
||||
/* Create a random set of memset inputs strings with the given length
|
||||
and alignment distributions. */
|
||||
for (n = 0; n < NUM_TESTS; n++)
|
||||
{
|
||||
int align = align_arr[rand () & ALIGN_MASK];
|
||||
int len = len_arr[rand () & SIZE_MASK];
|
||||
|
||||
test_arr[n].offset = (rand () & (max_size - 1)) & ~align;
|
||||
test_arr[n].len = len;
|
||||
}
|
||||
|
||||
json_element_object_begin (json_ctx);
|
||||
json_attr_uint (json_ctx, "length", (double) max_size);
|
||||
json_array_begin (json_ctx, "timings");
|
||||
|
||||
FOR_EACH_IMPL (impl, 0)
|
||||
do_one_test (json_ctx, impl, INNER_LOOP_ITERS_MEDIUM * 2, test_arr, n);
|
||||
|
||||
json_array_end (json_ctx);
|
||||
json_element_object_end (json_ctx);
|
||||
}
|
||||
|
||||
int
|
||||
test_main (void)
|
||||
{
|
||||
json_ctx_t json_ctx;
|
||||
|
||||
test_init ();
|
||||
init_memset_distribution ();
|
||||
memset (buf1, 1, MIN_PAGE_SIZE);
|
||||
|
||||
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", "random");
|
||||
|
||||
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 (int i = MIN_SIZE; i <= MAX_SIZE; i = i * 2)
|
||||
do_test (&json_ctx, i);
|
||||
|
||||
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>
|
||||
Loading…
Reference in New Issue
Block a user