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https://github.com/isar/libmdbx.git
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287 lines
11 KiB
C++
287 lines
11 KiB
C++
/*
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* Copyright 2017-2020 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "test.h"
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#include <cmath>
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/* LY: тест "эмуляцией time-to-live" с вложенными транзакциями:
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* - организуется "скользящее окно", которое каждую транзакцию сдвигается
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* вперед вдоль числовой оси.
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* - по переднему краю "скользящего окна" записи добавляются в таблицу,
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* а по заднему удаляются.
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* - количество добавляемых/удаляемых записей псевдослучайно зависит
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* от номера транзакции, но с экспоненциальным распределением.
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* - размер "скользящего окна" также псевдослучайно зависит от номера
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* транзакции с "отрицательным" экспоненциальным распределением
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* MAX_WIDTH - exp(rnd(N)), при уменьшении окна сдвигается задний
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* край и удаляются записи позади него.
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* - групповое добавление данных в начало окна и групповое удаление в конце,
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* преимущественно выполняются во вложенных транзакциях.
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* - меньшая часть запускаемых вложенных транзакций отменяется, с последующим
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* продолжением итераций с состояния предыдущиего коммита.
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*
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* Таким образом имитируется поведение таблицы с TTL: записи стохастически
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* добавляются и удаляются, и изредка происходят массивные удаления. */
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bool testcase_nested::setup() {
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if (!inherited::setup())
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return false;
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int err = db_open__begin__table_create_open_clean(dbi);
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if (unlikely(err != MDBX_SUCCESS)) {
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log_notice("nested: bailout-prepare due '%s'", mdbx_strerror(err));
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return false;
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}
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keyvalue_maker.setup(config.params, config.actor_id, 0 /* thread_number */);
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key = keygen::alloc(config.params.keylen_max);
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data = keygen::alloc(config.params.datalen_max);
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serial = 0;
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fifo.clear();
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speculum.clear();
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assert(stack.empty());
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stack.emplace(nullptr, serial, fifo, speculum);
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return true;
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}
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bool testcase_nested::teardown() {
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while (!stack.empty())
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pop_txn(true);
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bool ok = true;
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if (dbi) {
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if (config.params.drop_table && !mode_readonly()) {
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txn_begin(false);
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db_table_drop(dbi);
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int err = breakable_commit();
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if (unlikely(err != MDBX_SUCCESS)) {
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log_notice("nested: bailout-clean due '%s'", mdbx_strerror(err));
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ok = false;
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}
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} else
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db_table_close(dbi);
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dbi = 0;
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}
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return inherited::teardown() && ok;
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}
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void testcase_nested::push_txn() {
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MDBX_txn *txn;
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unsigned flags =
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prng32() & (MDBX_SAFE_NOSYNC | MDBX_NOMETASYNC | MDBX_MAPASYNC);
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int err = mdbx_txn_begin(db_guard.get(), txn_guard.get(), flags, &txn);
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if (unlikely(err != MDBX_SUCCESS))
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failure_perror("mdbx_txn_begin(nested)", err);
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stack.emplace(scoped_txn_guard(txn), serial, fifo, speculum);
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std::swap(txn_guard, std::get<0>(stack.top()));
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log_verbose("begin level#%zu txn #%" PRIu64 ", flags 0x%x, serial %" PRIu64,
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stack.size(), mdbx_txn_id(txn), flags, serial);
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}
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bool testcase_nested::pop_txn(bool abort) {
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assert(txn_guard && !stack.empty());
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bool should_continue = true;
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MDBX_txn *txn = txn_guard.release();
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bool commited = false;
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if (abort) {
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log_verbose(
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"abort level#%zu txn #%" PRIu64 ", undo serial %" PRIu64 " <- %" PRIu64,
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stack.size(), mdbx_txn_id(txn), serial, std::get<1>(stack.top()));
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int err = mdbx_txn_abort(txn);
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if (unlikely(err != MDBX_SUCCESS))
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failure_perror("mdbx_txn_abort()", err);
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} else {
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log_verbose("commit level#%zu txn, nested serial %" PRIu64 " -> %" PRIu64,
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stack.size(), serial, std::get<1>(stack.top()));
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int err = mdbx_txn_commit(txn);
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if (likely(err == MDBX_SUCCESS))
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commited = true;
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else {
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should_continue = false;
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if (err == MDBX_MAP_FULL && config.params.ignore_dbfull) {
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err = mdbx_txn_abort(txn);
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if (unlikely(err != MDBX_SUCCESS && err != MDBX_THREAD_MISMATCH &&
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err != MDBX_BAD_TXN))
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failure_perror("mdbx_txn_abort()", err);
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} else
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failure_perror("mdbx_txn_commit()", err);
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}
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}
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std::swap(txn_guard, std::get<0>(stack.top()));
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if (!commited) {
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serial = std::get<1>(stack.top());
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std::swap(fifo, std::get<2>(stack.top()));
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std::swap(speculum, std::get<3>(stack.top()));
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}
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stack.pop();
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return should_continue;
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}
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bool testcase_nested::stochastic_breakable_restart_with_nested(
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bool force_restart) {
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log_trace(">> stochastic_breakable_restart_with_nested%s",
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force_restart ? ": force_restart" : "");
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if (force_restart)
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while (txn_guard)
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pop_txn(true);
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bool should_continue = true;
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while (!stack.empty() &&
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(flipcoin() || txn_underutilization_x256(txn_guard.get()) < 42))
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should_continue &= pop_txn();
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if (should_continue)
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while (stack.empty() ||
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(is_nested_txn_available() && flipcoin() && stack.size() < 5))
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push_txn();
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log_trace("<< stochastic_breakable_restart_with_nested: should_continue=%s",
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should_continue ? "yes" : "no");
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return should_continue;
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}
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bool testcase_nested::trim_tail(unsigned window_width) {
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if (window_width || flipcoin()) {
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clear_stepbystep_passed += window_width == 0;
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while (fifo.size() > window_width) {
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uint64_t tail_serial = fifo.back().first;
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const unsigned tail_count = fifo.back().second;
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log_verbose("nested: pop-tail (serial %" PRIu64 ", count %u)",
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tail_serial, tail_count);
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fifo.pop_back();
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for (unsigned n = 0; n < tail_count; ++n) {
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log_trace("nested: remove-tail %" PRIu64, tail_serial);
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generate_pair(tail_serial);
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int err = remove(key, data);
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if (unlikely(err != MDBX_SUCCESS)) {
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if (err == MDBX_MAP_FULL && config.params.ignore_dbfull) {
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log_notice("nested: tail-bailout due '%s'", mdbx_strerror(err));
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return false;
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}
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failure_perror("mdbx_del(tail)", err);
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}
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if (unlikely(!keyvalue_maker.increment(tail_serial, 1)))
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failure("nested: unexpected key-space overflow on the tail");
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}
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report(tail_count);
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}
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} else if (!fifo.empty()) {
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log_verbose("nested: purge state %" PRIu64 " - %" PRIu64 ", fifo-items %zu",
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fifo.front().first, fifo.back().first + fifo.back().second,
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fifo.size());
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db_table_clear(dbi, txn_guard.get());
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fifo.clear();
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clear_wholetable_passed += 1;
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report(1);
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}
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return true;
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}
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bool testcase_nested::grow_head(unsigned head_count) {
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const unsigned insert_flags = (config.params.table_flags & MDBX_DUPSORT)
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? MDBX_NODUPDATA
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: MDBX_NODUPDATA | MDBX_NOOVERWRITE;
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retry:
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fifo.push_front(std::make_pair(serial, head_count));
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for (unsigned n = 0; n < head_count; ++n) {
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log_trace("nested: insert-head %" PRIu64, serial);
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generate_pair(serial);
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int err = insert(key, data, insert_flags);
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if (unlikely(err != MDBX_SUCCESS)) {
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if (err == MDBX_MAP_FULL && config.params.ignore_dbfull) {
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log_notice("nested: head-insert skip due '%s'", mdbx_strerror(err));
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head_count = n;
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stochastic_breakable_restart_with_nested(true);
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dbfull_passed += 1;
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goto retry;
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}
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failure_perror("mdbx_put(head)", err);
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}
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if (unlikely(!keyvalue_maker.increment(serial, 1))) {
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log_notice("nested: unexpected key-space overflow");
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keyspace_overflow = true;
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head_count = n;
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stochastic_breakable_restart_with_nested(true);
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goto retry;
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}
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}
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return true;
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}
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bool testcase_nested::run() {
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uint64_t seed =
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prng64_map2_white(config.params.keygen.seed) + config.actor_id;
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clear_wholetable_passed = 0;
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clear_stepbystep_passed = 0;
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dbfull_passed = 0;
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unsigned loops = 0;
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while (true) {
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const uint64_t salt = prng64_white(seed) /* mdbx_txn_id(txn_guard.get()) */;
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const unsigned window_width =
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(!should_continue() || flipcoin_x4()) ? 0 : edge2window(salt);
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const unsigned head_count = edge2count(salt);
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log_debug("nested: step #%" PRIu64 " (serial %" PRIu64
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", window %u, count %u) salt %" PRIu64,
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nops_completed, serial, window_width, head_count, salt);
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if (!trim_tail(window_width))
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return false;
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if (!stochastic_breakable_restart_with_nested()) {
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log_notice("nested: bailout at commit/restart after tail-trim");
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return false;
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}
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if (!speculum_verify()) {
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log_notice("nested: bailout after tail-trim");
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return false;
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}
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if (!keyspace_overflow && (should_continue() || !clear_wholetable_passed ||
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!clear_stepbystep_passed)) {
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unsigned underutilization_x256 =
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txn_underutilization_x256(txn_guard.get());
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if (dbfull_passed > underutilization_x256) {
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log_notice("nested: skip head-grow to avoid one more dbfull (was %u, "
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"underutilization %.2f%%)",
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dbfull_passed, underutilization_x256 / 2.560);
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continue;
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}
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if (!grow_head(head_count))
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return false;
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if (!stochastic_breakable_restart_with_nested())
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log_notice("nested: skip commit/restart after head-grow");
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if (!speculum_verify()) {
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log_notice("nested: bailout after head-grow");
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return false;
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}
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loops += 1;
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} else if (fifo.empty()) {
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log_notice("nested: done %u whole loops, %" PRIu64 " ops, %" PRIu64
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" items",
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loops, nops_completed, serial);
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break;
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} else {
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log_notice("nested: done, wait for empty, skip head-grow");
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}
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}
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while (!stack.empty())
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pop_txn(false);
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return speculum_verify();
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}
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