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Merge pull request #93 from hendrik-cliqz/mmap-options
implement different loading styles (mmap options)
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188
keyvi/src/cpp/dictionary/fsa/internal/memory_map_flags.h
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| Original file line number | Diff line number | Diff line change |
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| /* * keyvi - A key value store. | ||
| * | ||
| * Copyright 2015 Hendrik Muhs<hendrik.muhs@gmail.com> | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| /* | ||
| * memory_map_flags.h | ||
| * | ||
| * Created on: May 17, 2016 | ||
| * Author: hendrik | ||
| */ | ||
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| #ifndef KEYVI_MEMORY_MAP_FLAGS_H_ | ||
| #define KEYVI_MEMORY_MAP_FLAGS_H_ | ||
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| #include <boost/interprocess/file_mapping.hpp> | ||
| #include <boost/interprocess/mapped_region.hpp> | ||
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| namespace keyvi { | ||
| namespace dictionary { | ||
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| enum class loading_strategy_types { | ||
| default_os, // no special treatment, use whatever the OS/Boost has as default | ||
| lazy, // load data as needed with some read-ahead | ||
| populate, // immediately load everything in memory (blocks until everything is fully read) | ||
| populate_key_part, // populate only the key part, load value part lazy | ||
| populate_lazy, // load data lazy but ask the OS to read ahead if possible (does not block) | ||
| lazy_no_readahead, // disable any read-ahead (for cases when index > x * main memory) | ||
| lazy_no_readahead_value_part, // disable read-ahead only for the value part | ||
| populate_key_part_no_readahead_value_part // populate the key part, but disable read ahead value part | ||
| }; | ||
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| namespace fsa { | ||
| namespace internal { | ||
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| class MemoryMapFlags final{ | ||
| public: | ||
| /** | ||
| * Translates the loading strategy into the according options for mmap. To be used for loading the FSA part. | ||
| * | ||
| * @param strategy load strategy | ||
| * @return flags to be used for mmap (via boost). | ||
| */ | ||
| static int FSAGetMemoryMapOptions(const loading_strategy_types strategy) { | ||
| #ifdef _Win32 | ||
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| // there is no comparable fine-grained control on windows, so simply use the defaults | ||
| return boost::interprocess::default_map_options; | ||
| #else // not _Win32 | ||
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| if (strategy == loading_strategy_types::default_os) { | ||
| return boost::interprocess::default_map_options; | ||
| } | ||
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| int flags = 0; | ||
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| flags |= MAP_SHARED; | ||
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| #ifdef MAP_NOSYNC | ||
| flags |= MAP_NOSYNC | ||
| #endif | ||
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| switch (strategy){ | ||
| case loading_strategy_types::populate: | ||
| case loading_strategy_types::populate_key_part: | ||
| case loading_strategy_types::populate_key_part_no_readahead_value_part: | ||
| flags |= MAP_POPULATE; | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
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| return flags; | ||
| #endif // not _Win32 | ||
| } | ||
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| /** | ||
| * Translates the loading strategy into the according options for mmap. To be used for loading the Values part. | ||
| * | ||
| * @param strategy load strategy | ||
| * @return flags to be used for mmap (via boost). | ||
| */ | ||
| static int ValuesGetMemoryMapOptions(const loading_strategy_types strategy) { | ||
| #ifdef _Win32 | ||
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| // there is no comparable fine-grained control on windows, so simply use the defaults | ||
| return boost::interprocess::default_map_options; | ||
| #else // not _Win32 | ||
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| if (strategy == loading_strategy_types::default_os) { | ||
| return boost::interprocess::default_map_options; | ||
| } | ||
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| int flags = 0; | ||
| flags |= MAP_SHARED; | ||
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| #ifdef MAP_NOSYNC | ||
| flags |= MAP_NOSYNC | ||
| #endif | ||
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| switch (strategy){ | ||
| case loading_strategy_types::populate: | ||
| flags |= MAP_POPULATE; | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
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| return flags; | ||
| #endif // not _Win32 | ||
| } | ||
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| /** | ||
| * Translates the loading strategy into the according options for madvise. To be used for loading the FSA part. | ||
| * | ||
| * @param strategy load strategy | ||
| * @return advise to be used for madvise (via boost) | ||
| */ | ||
| static boost::interprocess::mapped_region::advice_types FSAGetMemoryMapAdvices(const loading_strategy_types strategy) { | ||
| #ifdef _Win32 | ||
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| // there is no madvise on windows, so simply use the default | ||
| return boost::interprocess::mapped_region::advice_types::advice_normal; | ||
| #else // _Win32 | ||
| switch (strategy){ | ||
| case loading_strategy_types::lazy_no_readahead: | ||
| return boost::interprocess::mapped_region::advice_types::advice_random; | ||
| case loading_strategy_types::lazy_no_readahead_value_part: | ||
| case loading_strategy_types::populate_key_part_no_readahead_value_part: | ||
| break; | ||
| case loading_strategy_types::populate_lazy: | ||
| return boost::interprocess::mapped_region::advice_types::advice_willneed; | ||
| default: | ||
| break; | ||
| } | ||
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| return boost::interprocess::mapped_region::advice_types::advice_normal; | ||
| #endif | ||
| } | ||
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| /** | ||
| * Translates the loading strategy into the according options for madvise. To be used for loading the Values part. | ||
| * | ||
| * @param strategy load strategy | ||
| * @return advise to be used for madvise (via boost) | ||
| */ | ||
| static boost::interprocess::mapped_region::advice_types ValuesGetMemoryMapAdvices(const loading_strategy_types strategy) { | ||
| #ifdef _Win32 | ||
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| // there is no madvise on windows, so simply use the default | ||
| return boost::interprocess::mapped_region::advice_types::advice_normal; | ||
| #else // _Win32 | ||
| switch (strategy){ | ||
| case loading_strategy_types::lazy_no_readahead: | ||
| case loading_strategy_types::lazy_no_readahead_value_part: | ||
| case loading_strategy_types::populate_key_part_no_readahead_value_part: | ||
| return boost::interprocess::mapped_region::advice_types::advice_random; | ||
| case loading_strategy_types::populate_lazy: | ||
| return boost::interprocess::mapped_region::advice_types::advice_willneed; | ||
| default: | ||
| break; | ||
| } | ||
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| return boost::interprocess::mapped_region::advice_types::advice_normal; | ||
| #endif | ||
| } | ||
| }; | ||
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| } /* namespace internal */ | ||
| } /* namespace fsa */ | ||
| } /* namespace dictionary */ | ||
| } /* namespace keyvi */ | ||
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| #endif /* KEYVI_MEMORY_MAP_FLAGS_H_ */ |
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