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108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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//
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// Copied from
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// http://benchmarksgame.alioth.debian.org/u64q/program.php?test=binarytrees&lang=gpp&id=2
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// and slightly modified (particularly by adding multi-threaded
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// operation to hit malloc harder).
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//
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// This version of binary trees is mostly new/delete benchmark
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//
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// NOTE: copyright of this code is unclear, but we only distribute
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// source.
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/* The Computer Language Benchmarks Game
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* http://benchmarksgame.alioth.debian.org/
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*
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* Contributed by Jon Harrop
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* Modified by Alex Mizrahi
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* Adapted for gperftools and added threads by Aliaksei Kandratsenka
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*/
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#include <algorithm>
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#include <errno.h>
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#include <iostream>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vector>
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struct Node {
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Node *l, *r;
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int i;
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Node(int i2) : l(0), r(0), i(i2) {}
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Node(Node *l2, int i2, Node *r2) : l(l2), r(r2), i(i2) {}
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~Node() { delete l; delete r; }
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int check() const {
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if (l) {
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return l->check() + i - r->check();
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} else {
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return i;
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}
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}
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};
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Node *make(int i, int d) {
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if (d == 0) return new Node(i);
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return new Node(make(2*i-1, d-1), i, make(2*i, d-1));
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}
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void run(int given_depth) {
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int min_depth = 4,
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max_depth = std::max(min_depth+2,
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given_depth),
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stretch_depth = max_depth+1;
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{
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Node *c = make(0, stretch_depth);
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std::cout << "stretch tree of depth " << stretch_depth << "\t "
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<< "check: " << c->check() << std::endl;
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delete c;
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}
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Node *long_lived_tree=make(0, max_depth);
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for (int d=min_depth; d<=max_depth; d+=2) {
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int iterations = 1 << (max_depth - d + min_depth), c=0;
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for (int i=1; i<=iterations; ++i) {
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Node *a = make(i, d), *b = make(-i, d);
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c += a->check() + b->check();
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delete a;
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delete b;
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}
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std::cout << (2*iterations) << "\t trees of depth " << d << "\t "
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<< "check: " << c << std::endl;
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}
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std::cout << "long lived tree of depth " << max_depth << "\t "
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<< "check: " << (long_lived_tree->check()) << "\n";
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delete long_lived_tree;
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}
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static void *run_tramp(void *_a) {
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intptr_t a = reinterpret_cast<intptr_t>(_a);
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run(a);
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return 0;
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}
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int main(int argc, char *argv[]) {
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int given_depth = argc >= 2 ? atoi(argv[1]) : 20;
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int thread_count = std::max(1, argc >= 3 ? atoi(argv[2]) : 1) - 1;
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std::vector<pthread_t> threads(thread_count);
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for (int i = 0; i < thread_count; i++) {
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int rv = pthread_create(&threads[i], NULL,
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run_tramp,
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reinterpret_cast<void *>(given_depth));
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if (rv) {
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errno = rv;
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perror("pthread_create");
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}
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}
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run_tramp(reinterpret_cast<void *>(given_depth));
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for (int i = 0; i < thread_count; i++) {
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pthread_join(threads[i], NULL);
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}
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return 0;
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}
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