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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/datastore/unique_store_string_allocator.hpp>
#include <vespa/vespalib/gtest/gtest.h>
#include <vespa/vespalib/test/datastore/buffer_stats.h>
#include <vespa/vespalib/test/insertion_operators.h>
#include <vespa/vespalib/test/memory_allocator_observer.h>
#include <vespa/vespalib/util/traits.h>
#include <vector>
using namespace vespalib::datastore;
using vespalib::MemoryUsage;
using generation_t = vespalib::GenerationHandler::generation_t;
using TestBufferStats = vespalib::datastore::test::BufferStats;
using vespalib::alloc::MemoryAllocator;
using vespalib::alloc::test::MemoryAllocatorObserver;
using AllocStats = MemoryAllocatorObserver::Stats;
namespace {
std::string small("small");
std::string middle("middle long string");
std::string spaces1000(1000, ' ');
}
template <typename RefT = EntryRefT<22>>
struct TestBase : public ::testing::Test {
using EntryRefType = RefT;
AllocStats stats;
UniqueStoreStringAllocator<EntryRefType> allocator;
generation_t generation;
TestBase()
: stats(),
allocator(std::make_unique<MemoryAllocatorObserver>(stats)),
generation(1)
{}
void assert_add(const char *input) {
EntryRef ref = add(input);
assert_get(ref, input);
}
EntryRef add(const char *input) {
return allocator.allocate(input);
}
void assert_get(EntryRef ref, const char *exp) const {
const char *act = allocator.get(ref);
EXPECT_STREQ(exp, act);
}
void remove(EntryRef ref) {
allocator.hold(ref);
}
EntryRef move(EntryRef ref) {
return allocator.move(ref);
}
uint32_t get_buffer_id(EntryRef ref) const {
return EntryRefType(ref).bufferId();
}
const BufferState &buffer_state(EntryRef ref) const {
return allocator.get_data_store().getBufferState(get_buffer_id(ref));
}
void assert_buffer_state(EntryRef ref, const TestBufferStats expStats) const {
EXPECT_EQ(expStats._used, buffer_state(ref).size());
EXPECT_EQ(expStats._hold, buffer_state(ref).stats().hold_elems());
EXPECT_EQ(expStats._dead, buffer_state(ref).stats().dead_elems());
EXPECT_EQ(expStats._extra_used, buffer_state(ref).stats().extra_used_bytes());
EXPECT_EQ(expStats._extra_hold, buffer_state(ref).stats().extra_hold_bytes());
}
void trim_hold_lists() {
allocator.get_data_store().transferHoldLists(generation++);
allocator.get_data_store().trimHoldLists(generation);
}
};
using StringTest = TestBase<EntryRefT<22>>;
using SmallOffsetStringTest = TestBase<EntryRefT<10, 10>>;
TEST_F(StringTest, can_add_and_get_values)
{
assert_add(small.c_str());
assert_add(middle.c_str());
assert_add(spaces1000.c_str());
}
TEST_F(StringTest, elements_are_put_on_hold_when_value_is_removed)
{
EntryRef ref = add(small.c_str());
assert_buffer_state(ref, TestBufferStats().used(16).hold(0).dead(0));
remove(ref);
assert_buffer_state(ref, TestBufferStats().used(16).hold(16).dead(0));
trim_hold_lists();
assert_buffer_state(ref, TestBufferStats().used(16).hold(0).dead(16));
}
TEST_F(StringTest, extra_bytes_used_is_tracked)
{
EntryRef ref = add(spaces1000.c_str());
// Note: The first buffer have the first element reserved -> we expect 2 elements used here.
assert_buffer_state(ref, TestBufferStats().used(2).hold(0).dead(1).extra_used(1001));
remove(ref);
assert_buffer_state(ref, TestBufferStats().used(2).hold(1).dead(1).extra_used(1001).extra_hold(1001));
trim_hold_lists();
assert_buffer_state(ref, TestBufferStats().used(2).hold(0).dead(2));
ref = add(spaces1000.c_str());
assert_buffer_state(ref, TestBufferStats().used(2).hold(0).dead(1).extra_used(1001));
EntryRef ref2 = move(ref);
assert_get(ref2, spaces1000.c_str());
assert_buffer_state(ref, TestBufferStats().used(3).hold(0).dead(1).extra_used(2002));
remove(ref);
remove(ref2);
assert_buffer_state(ref, TestBufferStats().used(3).hold(2).dead(1).extra_used(2002).extra_hold(2002));
trim_hold_lists();
assert_buffer_state(ref, TestBufferStats().used(3).hold(0).dead(3));
}
TEST_F(StringTest, string_length_determines_buffer)
{
EntryRef ref1 = add(small.c_str());
EntryRef ref2 = add(middle.c_str());
EntryRef ref3 = add(spaces1000.c_str());
EXPECT_NE(get_buffer_id(ref1), get_buffer_id(ref2));
EXPECT_NE(get_buffer_id(ref1), get_buffer_id(ref3));
EXPECT_NE(get_buffer_id(ref2), get_buffer_id(ref3));
EntryRef ref4 = add(small.c_str());
EXPECT_NE(ref1, ref4);
EXPECT_EQ(get_buffer_id(ref1), get_buffer_id(ref4));
}
TEST_F(StringTest, free_list_is_used_when_enabled)
{
// Free lists are default enabled for UniqueStoreStringAllocator
EntryRef ref1 = add(small.c_str());
EntryRef ref2 = add(spaces1000.c_str());
remove(ref1);
remove(ref2);
trim_hold_lists();
EntryRef ref3 = add(small.c_str());
EntryRef ref4 = add(spaces1000.c_str());
EXPECT_EQ(ref1, ref3);
EXPECT_EQ(ref2, ref4);
assert_buffer_state(ref1, TestBufferStats().used(16).hold(0).dead(0));
assert_buffer_state(ref2, TestBufferStats().used(2).hold(0).dead(1).extra_used(1001));
}
TEST_F(StringTest, free_list_is_not_used_when_disabled)
{
allocator.get_data_store().disableFreeLists();
EntryRef ref1 = add(small.c_str());
EntryRef ref2 = add(spaces1000.c_str());
remove(ref1);
remove(ref2);
trim_hold_lists();
EntryRef ref3 = add(small.c_str());
EntryRef ref4 = add(spaces1000.c_str());
EXPECT_NE(ref1, ref3);
EXPECT_NE(ref2, ref4);
assert_buffer_state(ref1, TestBufferStats().used(32).hold(0).dead(16));
assert_buffer_state(ref2, TestBufferStats().used(3).hold(0).dead(2).extra_used(1001));
}
TEST_F(StringTest, free_list_is_never_used_for_move)
{
// Free lists are default enabled for UniqueStoreStringAllocator
EntryRef ref1 = add(small.c_str());
EntryRef ref2 = add(spaces1000.c_str());
EntryRef ref3 = add(small.c_str());
EntryRef ref4 = add(spaces1000.c_str());
remove(ref3);
remove(ref4);
trim_hold_lists();
EntryRef ref5 = move(ref1);
EntryRef ref6 = move(ref2);
EXPECT_NE(ref5, ref3);
EXPECT_NE(ref6, ref4);
assert_buffer_state(ref1, TestBufferStats().used(48).hold(0).dead(16));
assert_buffer_state(ref2, TestBufferStats().used(4).hold(0).dead(2).extra_used(2002));
}
TEST_F(StringTest, provided_memory_allocator_is_used)
{
EXPECT_EQ(AllocStats(18, 0), stats);
}
TEST_F(SmallOffsetStringTest, new_underlying_buffer_is_allocated_when_current_is_full)
{
uint32_t first_buffer_id = get_buffer_id(add(small.c_str()));
for (uint32_t i = 0; i < (SmallOffsetStringTest::EntryRefType::offsetSize() - 1); ++i) {
uint32_t buffer_id = get_buffer_id(add(small.c_str()));
EXPECT_EQ(first_buffer_id, buffer_id);
}
uint32_t second_buffer_id = get_buffer_id(add(small.c_str()));
EXPECT_NE(first_buffer_id, second_buffer_id);
for (uint32_t i = 0; i < 10u; ++i) {
uint32_t buffer_id = get_buffer_id(add(small.c_str()));
EXPECT_EQ(second_buffer_id, buffer_id);
}
EXPECT_LT(18, stats.alloc_cnt);
}
GTEST_MAIN_RUN_ALL_TESTS()
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