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/*
* benchmark.c:
* Author: Konstantin Khlebnikov <koct9i@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/radix-tree.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <time.h>
#include "test.h"
#define NSEC_PER_SEC 1000000000L
static long long benchmark_iter(struct radix_tree_root *root, bool tagged)
{
volatile unsigned long sink = 0;
struct radix_tree_iter iter;
struct timespec start, finish;
long long nsec;
int l, loops = 1;
void **slot;
#ifdef BENCHMARK
again:
#endif
clock_gettime(CLOCK_MONOTONIC, &start);
for (l = 0; l < loops; l++) {
if (tagged) {
radix_tree_for_each_tagged(slot, root, &iter, 0, 0)
sink ^= (unsigned long)slot;
} else {
radix_tree_for_each_slot(slot, root, &iter, 0)
sink ^= (unsigned long)slot;
}
}
clock_gettime(CLOCK_MONOTONIC, &finish);
nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
(finish.tv_nsec - start.tv_nsec);
#ifdef BENCHMARK
if (loops == 1 && nsec * 5 < NSEC_PER_SEC) {
loops = NSEC_PER_SEC / nsec / 4 + 1;
goto again;
}
#endif
nsec /= loops;
return nsec;
}
static void benchmark_size(unsigned long size, unsigned long step, int order)
{
RADIX_TREE(tree, GFP_KERNEL);
long long normal, tagged;
unsigned long index;
for (index = 0 ; index < size ; index += step) {
item_insert_order(&tree, index, order);
radix_tree_tag_set(&tree, index, 0);
}
tagged = benchmark_iter(&tree, true);
normal = benchmark_iter(&tree, false);
printf("Size %ld, step %6ld, order %d tagged %10lld ns, normal %10lld ns\n",
size, step, order, tagged, normal);
item_kill_tree(&tree);
rcu_barrier();
}
void benchmark(void)
{
unsigned long size[] = {1 << 10, 1 << 20, 0};
unsigned long step[] = {1, 2, 7, 15, 63, 64, 65,
128, 256, 512, 12345, 0};
int c, s;
printf("starting benchmarks\n");
printf("RADIX_TREE_MAP_SHIFT = %d\n", RADIX_TREE_MAP_SHIFT);
for (c = 0; size[c]; c++)
for (s = 0; step[s]; s++)
benchmark_size(size[c], step[s], 0);
for (c = 0; size[c]; c++)
for (s = 0; step[s]; s++)
benchmark_size(size[c], step[s] << 9, 9);
}
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