diff options
Diffstat (limited to 'benchtests')
| -rw-r--r-- | benchtests/Makefile | 1 | ||||
| -rw-r--r-- | benchtests/bench-memset-random.c | 185 |
2 files changed, 186 insertions, 0 deletions
diff --git a/benchtests/Makefile b/benchtests/Makefile index 382fb7bae1..d228e9e68a 100644 --- a/benchtests/Makefile +++ b/benchtests/Makefile @@ -153,6 +153,7 @@ string-benchset := \ memrchr \ memset \ memset-large \ + memset-random \ memset-zero \ memset-zero-large \ rawmemchr \ diff --git a/benchtests/bench-memset-random.c b/benchtests/bench-memset-random.c new file mode 100644 index 0000000000..9c1eacbf81 --- /dev/null +++ b/benchtests/bench-memset-random.c @@ -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> |