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46ae07324b
Improve string benchtest timing. Many tests run for 0.01s which is way too short to give accurate results. Other tests take over 40 seconds which is way too long. Significantly increase the iterations of the short running tests. Reduce number of alignment variations in the long running memcpy walk tests so they take less than 5 seconds. As a result most tests take at least 0.1s and all finish within 5 seconds. * benchtests/bench-memcpy-random.c (do_one_test): Use medium iterations. * benchtests/bench-memcpy-walk.c (test_main): Reduce alignment tests. * benchtests/bench-memmem.c (do_one_test): Use small iterations. * benchtests/bench-memmove-walk.c (test_main): Reduce alignment tests. * benchtests/bench-memset-walk.c (test_main): Reduce alignment tests. * benchtests/bench-strcasestr.c (do_one_test): Use small iterations. * benchtests/bench-string.h (INNER_LOOP_ITERS): Increase iterations. (INNER_LOOP_ITERS_MEDIUM): New define. (INNER_LOOP_ITERS_SMALL): New define. * benchtests/bench-strpbrk.c (do_one_test): Use medium iterations. * benchtests/bench-strsep.c (do_one_test): Use small iterations. * benchtests/bench-strspn.c (do_one_test): Use medium iterations. * benchtests/bench-strstr.c (do_one_test): Use small iterations. * benchtests/bench-strtok.c (do_one_test): Use small iterations.
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/* Measure memcpy function combined throughput for different alignments.
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Copyright (C) 2017-2019 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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<http://www.gnu.org/licenses/>. */
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/* This microbenchmark measures the throughput of memcpy for various sizes from
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1 byte to 32MiB, doubling every iteration and then misaligning by 0-15
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bytes. The copies are done from source to destination and then back and the
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source walks forward across the array and the destination walks backward by
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one byte each, thus measuring misaligned accesses as well. The idea is to
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avoid caching effects by copying a different string and far enough from each
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other, walking in different directions so that we can measure prefetcher
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efficiency (software or hardware) more closely than with a loop copying the
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same data over and over, which eventually only gives us L1 cache
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performance. */
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#ifndef MEMCPY_RESULT
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# define MEMCPY_RESULT(dst, len) dst
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# define START_SIZE 128
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# define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
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# define TEST_MAIN
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# define TEST_NAME "memcpy"
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# define TIMEOUT (20 * 60)
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# include "bench-string.h"
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IMPL (memcpy, 1)
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#endif
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#include "json-lib.h"
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typedef char *(*proto_t) (char *, const char *, size_t);
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
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size_t len)
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{
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size_t i = 0;
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timing_t start, stop, cur;
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char *dst_end = dst + MIN_PAGE_SIZE - len;
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char *src_end = src + MIN_PAGE_SIZE - len;
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TIMING_NOW (start);
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/* Copy the entire buffer backwards, LEN at a time. */
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for (; src_end >= src && dst_end >= dst; src_end -= len, dst_end -= len, i++)
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CALL (impl, src_end, dst_end, len);
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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/* Get time taken per function call. */
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json_element_double (json_ctx, (double) cur / i);
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}
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static void
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do_test (json_ctx_t *json_ctx, size_t 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) len);
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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, (char *) buf2, (char *) buf1, len);
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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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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, "memcpy");
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json_attr_string (&json_ctx, "bench-variant", "walk");
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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 (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
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{
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do_test (&json_ctx, i);
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do_test (&json_ctx, i + 1);
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}
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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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