cfa40bcfd6
This adds simple benchmark for iterator similar to one I've used for
commit 78c1d78488 ("radix-tree: introduce bit-optimized iterator")
Building with make BENCHMARK=1 set radix tree order to 6, this allows to
get performance comparable to in kernel performance.
Link: http://lkml.kernel.org/r/1480369871-5271-43-git-send-email-mawilcox@linuxonhyperv.com
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/*
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* benchmark.c:
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* Author: Konstantin Khlebnikov <koct9i@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/radix-tree.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <time.h>
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#include "test.h"
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#define NSEC_PER_SEC 1000000000L
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static long long benchmark_iter(struct radix_tree_root *root, bool tagged)
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{
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volatile unsigned long sink = 0;
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struct radix_tree_iter iter;
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struct timespec start, finish;
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long long nsec;
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int l, loops = 1;
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void **slot;
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#ifdef BENCHMARK
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again:
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#endif
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (l = 0; l < loops; l++) {
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if (tagged) {
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radix_tree_for_each_tagged(slot, root, &iter, 0, 0)
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sink ^= (unsigned long)slot;
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} else {
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radix_tree_for_each_slot(slot, root, &iter, 0)
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sink ^= (unsigned long)slot;
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}
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}
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clock_gettime(CLOCK_MONOTONIC, &finish);
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nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
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(finish.tv_nsec - start.tv_nsec);
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#ifdef BENCHMARK
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if (loops == 1 && nsec * 5 < NSEC_PER_SEC) {
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loops = NSEC_PER_SEC / nsec / 4 + 1;
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goto again;
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}
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#endif
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nsec /= loops;
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return nsec;
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}
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static void benchmark_size(unsigned long size, unsigned long step, int order)
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{
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RADIX_TREE(tree, GFP_KERNEL);
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long long normal, tagged;
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unsigned long index;
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for (index = 0 ; index < size ; index += step) {
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item_insert_order(&tree, index, order);
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radix_tree_tag_set(&tree, index, 0);
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}
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tagged = benchmark_iter(&tree, true);
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normal = benchmark_iter(&tree, false);
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printf("Size %ld, step %6ld, order %d tagged %10lld ns, normal %10lld ns\n",
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size, step, order, tagged, normal);
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item_kill_tree(&tree);
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rcu_barrier();
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}
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void benchmark(void)
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{
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unsigned long size[] = {1 << 10, 1 << 20, 0};
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unsigned long step[] = {1, 2, 7, 15, 63, 64, 65,
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128, 256, 512, 12345, 0};
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int c, s;
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printf("starting benchmarks\n");
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printf("RADIX_TREE_MAP_SHIFT = %d\n", RADIX_TREE_MAP_SHIFT);
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for (c = 0; size[c]; c++)
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for (s = 0; step[s]; s++)
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benchmark_size(size[c], step[s], 0);
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for (c = 0; size[c]; c++)
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for (s = 0; step[s]; s++)
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benchmark_size(size[c], step[s] << 9, 9);
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}
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