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Diffstat (limited to 'benchtests/bench-memcpy-random.c')
| -rw-r--r-- | benchtests/bench-memcpy-random.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/benchtests/bench-memcpy-random.c b/benchtests/bench-memcpy-random.c new file mode 100644 index 0000000..4cd6209 --- /dev/null +++ b/benchtests/bench-memcpy-random.c @@ -0,0 +1,157 @@ +/* Measure memcpy performance. + Copyright (C) 2016-2017 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 MIN_PAGE_SIZE 131072 +#define TEST_MAIN +#define TEST_NAME "memcpy-random" +#include "bench-string.h" +#include <assert.h> + +IMPL (memcpy, 0) + +#define NUM_COPIES 4096 + +typedef struct { uint16_t size; uint16_t freq; } freq_data_t; +typedef struct { uint8_t align; uint8_t freq; } align_data_t; + +#define SIZE_NUM 1024 +#define SIZE_MASK (SIZE_NUM-1) +static uint8_t size_arr[SIZE_NUM]; + +/* Frequency data for memcpy of less than 256 bytes based on SPEC2006. */ +static freq_data_t size_freq[] = +{ + { 8, 576}, {104, 94}, { 24, 78}, { 48, 58}, { 32, 48}, { 16, 46}, + { 1, 30}, { 96, 12}, { 72, 11}, {216, 11}, {192, 8}, { 12, 7}, + {144, 5}, { 2, 4}, { 64, 4}, {120, 4}, { 4, 3}, { 40, 2}, + { 7, 2}, {168, 2}, {160, 2}, {128, 1}, { 3, 1}, { 9, 1}, + {176, 1}, {240, 1}, { 11, 1}, { 0, 1}, { 5, 1}, { 6, 1}, + { 80, 1}, { 52, 1}, {152, 1}, { 10, 1}, { 56, 1}, { 51, 1}, + { 14, 1}, {208, 1}, { 0, 0} +}; + +#define ALIGN_NUM 256 +#define ALIGN_MASK (ALIGN_NUM-1) +static uint8_t src_align_arr[ALIGN_NUM]; +static uint8_t dst_align_arr[ALIGN_NUM]; + +/* Source alignment frequency for memcpy based on SPEC2006. */ +static align_data_t src_align_freq[] = +{ + {16, 144}, {8, 86}, {3, 23}, {1, 3}, {0, 0} +}; + +/* Destination alignment frequency for memcpy based on SPEC2006. */ +static align_data_t dst_align_freq[] = +{ + {16, 197}, {8, 30}, {3, 23}, {1, 6}, {0, 0} +}; + +typedef struct +{ + uint16_t src; + uint16_t dst; + uint16_t len; +} copy_t; + +static copy_t copy[NUM_COPIES]; + +typedef char *(*proto_t) (char *, const char *, size_t); + +static void +init_copy_distribution (void) +{ + int i, j, freq, size, n; + + for (n = i = 0; (freq = size_freq[i].freq) != 0; i++) + for (j = 0, size = size_freq[i].size; j < freq; j++) + size_arr[n++] = size; + assert (n == SIZE_NUM); + + for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++) + for (j = 0, size = src_align_freq[i].align; j < freq; j++) + src_align_arr[n++] = size - 1; + assert (n == ALIGN_NUM); + + for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++) + for (j = 0, size = dst_align_freq[i].align; j < freq; j++) + dst_align_arr[n++] = size - 1; + assert (n == ALIGN_NUM); +} + + +static void +do_one_test (impl_t *impl, char *dst, char *src, copy_t *copy, size_t n) +{ + timing_t start, stop, cur; + size_t iters = INNER_LOOP_ITERS * 20; + + TIMING_NOW (start); + for (int i = 0; i < iters; ++i) + for (int j = 0; j < n; j++) + CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len); + TIMING_NOW (stop); + + TIMING_DIFF (cur, start, stop); + + TIMING_PRINT_MEAN ((double) cur, (double) iters); +} + +static void +do_test (size_t max_size) +{ + for (int i = 0; i < max_size; i++) + buf1[i] = i * 3; + + /* Create a random set of copies with the given size and alignment + distributions. */ + for (int i = 0; i < NUM_COPIES; i++) + { + copy[i].dst = (rand () & (max_size - 1)) | 1; + copy[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK]; + copy[i].src = (rand () & (max_size - 1)) | 3; + copy[i].src &= ~src_align_arr[rand () & ALIGN_MASK]; + copy[i].len = size_arr[rand () & SIZE_MASK]; + } + + printf ("Memory size %6zd:", max_size); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, (char *) buf2, (char *) buf1, copy, NUM_COPIES); + + putchar ('\n'); +} + +int +test_main (void) +{ + test_init (); + init_copy_distribution (); + + printf ("%23s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (int i = 4; i <= 64; i = i * 2) + do_test (i * 1024); + + return ret; +} + +#include <support/test-driver.c> |