Summary: This patch allows an application to specify whether to use bufferedio, reads-via-mmaps and writes-via-mmaps per database. Earlier, there was a global static variable that was used to configure this functionality. The default setting remains the same (and is backward compatible): 1. use bufferedio 2. do not use mmaps for reads 3. use mmap for writes 4. use readaheads for reads needed for compaction I also added a parameter to db_bench to be able to explicitly specify whether to do readaheads for compactions or not. Test Plan: make check Reviewers: sheki, heyongqiang, MarkCallaghan Reviewed By: sheki CC: leveldb Differential Revision: https://reviews.facebook.net/D9429main
Dhruba Borthakur
12 years ago
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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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//
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#ifndef STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_ |
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#define STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_ |
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#include <string> |
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#include <stdint.h> |
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#include "leveldb/env.h" |
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#include "leveldb/options.h" |
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namespace leveldb { |
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// Environment Options that are used to read files from storage
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class StorageOptions : public EnvOptions { |
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public: |
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/* implicit */ StorageOptions(const Options& opt) : |
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data_in_os_(opt.allow_os_buffer), |
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fs_readahead_(opt.allow_readahead), |
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readahead_compactions_(opt.allow_readahead_compactions), |
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use_mmap_reads_(opt.allow_mmap_reads), |
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use_mmap_writes_(opt.allow_mmap_writes) { |
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} |
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// copy constructor with readaheads set to readahead_compactions_
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StorageOptions(const StorageOptions& opt) { |
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data_in_os_ = opt.UseOsBuffer(); |
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fs_readahead_ = opt.UseReadaheadCompactions(); |
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readahead_compactions_ = opt.UseReadaheadCompactions(); |
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use_mmap_reads_ = opt.UseMmapReads(); |
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use_mmap_writes_ = opt.UseMmapWrites(); |
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} |
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// constructor with default options
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StorageOptions() { |
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Options opt; |
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data_in_os_ = opt.allow_os_buffer; |
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fs_readahead_ = opt.allow_readahead; |
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readahead_compactions_ = fs_readahead_; |
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use_mmap_reads_ = opt.allow_mmap_reads; |
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use_mmap_writes_ = opt.allow_mmap_writes; |
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} |
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virtual ~StorageOptions() {} |
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bool UseOsBuffer() const { return data_in_os_; }; |
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bool UseReadahead() const { return fs_readahead_; }; |
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bool UseMmapReads() const { return use_mmap_reads_; } |
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bool UseMmapWrites() const { return use_mmap_writes_; } |
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bool UseReadaheadCompactions() const { return readahead_compactions_;} |
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private: |
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bool data_in_os_; |
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bool fs_readahead_; |
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bool readahead_compactions_; |
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bool use_mmap_reads_; |
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bool use_mmap_writes_; |
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}; |
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_
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