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