mirror of https://github.com/facebook/rocksdb.git
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/arena_impl.h"
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#include "util/random.h"
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#include "util/testharness.h"
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namespace rocksdb {
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class ArenaImplTest { };
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TEST(ArenaImplTest, Empty) {
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ArenaImpl arena0;
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}
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TEST(ArenaImplTest, MemoryAllocatedBytes) {
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const int N = 17;
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size_t req_sz; //requested size
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size_t bsz = 8192; // block size
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size_t expected_memory_allocated;
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ArenaImpl arena_impl(bsz);
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// requested size > quarter of a block:
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// allocate requested size separately
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req_sz = 3001;
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for (int i = 0; i < N; i++) {
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arena_impl.Allocate(req_sz);
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}
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expected_memory_allocated = req_sz * N;
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ASSERT_EQ(arena_impl.MemoryAllocatedBytes(), expected_memory_allocated);
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// requested size < quarter of a block:
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// allocate a block with the default size, then try to use unused part
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// of the block. So one new block will be allocated for the first
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// Allocate(99) call. All the remaining calls won't lead to new allocation.
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req_sz = 99;
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for (int i = 0; i < N; i++) {
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arena_impl.Allocate(req_sz);
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}
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expected_memory_allocated += bsz;
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ASSERT_EQ(arena_impl.MemoryAllocatedBytes(), expected_memory_allocated);
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// requested size > quarter of a block:
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// allocate requested size separately
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req_sz = 99999999;
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for (int i = 0; i < N; i++) {
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arena_impl.Allocate(req_sz);
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}
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expected_memory_allocated += req_sz * N;
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ASSERT_EQ(arena_impl.MemoryAllocatedBytes(), expected_memory_allocated);
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}
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TEST(ArenaImplTest, Simple) {
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std::vector<std::pair<size_t, char*> > allocated;
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ArenaImpl arena_impl;
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const int N = 100000;
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size_t bytes = 0;
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Random rnd(301);
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for (int i = 0; i < N; i++) {
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size_t s;
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if (i % (N / 10) == 0) {
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s = i;
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} else {
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s = rnd.OneIn(4000) ? rnd.Uniform(6000) :
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(rnd.OneIn(10) ? rnd.Uniform(100) : rnd.Uniform(20));
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}
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if (s == 0) {
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// Our arena disallows size 0 allocations.
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s = 1;
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}
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char* r;
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if (rnd.OneIn(10)) {
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r = arena_impl.AllocateAligned(s);
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} else {
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r = arena_impl.Allocate(s);
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}
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for (unsigned int b = 0; b < s; b++) {
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// Fill the "i"th allocation with a known bit pattern
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r[b] = i % 256;
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}
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bytes += s;
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allocated.push_back(std::make_pair(s, r));
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ASSERT_GE(arena_impl.ApproximateMemoryUsage(), bytes);
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if (i > N/10) {
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ASSERT_LE(arena_impl.ApproximateMemoryUsage(), bytes * 1.10);
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}
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}
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for (unsigned int i = 0; i < allocated.size(); i++) {
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size_t num_bytes = allocated[i].first;
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const char* p = allocated[i].second;
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for (unsigned int b = 0; b < num_bytes; b++) {
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// Check the "i"th allocation for the known bit pattern
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ASSERT_EQ(int(p[b]) & 0xff, (int)(i % 256));
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}
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}
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}
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} // namespace rocksdb
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int main(int argc, char** argv) {
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return rocksdb::test::RunAllTests();
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}
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