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Revision 33323f21117e5bb8cf72569302f109aabb387bb9 authored by Mark Callaghan on 14 September 2012, 19:35:02 UTC, committed by Mark Callaghan on 14 September 2012, 23:43:50 UTC 
Remove use of mmap for random reads
 
Summary:
Reads via mmap on concurrent workloads are much slower than pread.
For example on a 24-core server with storage that can do 100k IOPS or more
I can get no more than 10k IOPS with mmap reads and 32+ threads.

Test Plan: db_bench benchmarks

Reviewers: dhruba, heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D5433
1 parent fa29f82
Raw File
builder.h 
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.

#ifndef STORAGE_LEVELDB_DB_BUILDER_H_
#define STORAGE_LEVELDB_DB_BUILDER_H_

#include "leveldb/status.h"

namespace leveldb {

struct Options;
struct FileMetaData;

class Env;
class Iterator;
class TableCache;
class VersionEdit;

// Build a Table file from the contents of *iter.  The generated file
// will be named according to meta->number.  On success, the rest of
// *meta will be filled with metadata about the generated table.
// If no data is present in *iter, meta->file_size will be set to
// zero, and no Table file will be produced.
extern Status BuildTable(const std::string& dbname,
                         Env* env,
                         const Options& options,
                         TableCache* table_cache,
                         Iterator* iter,
                         FileMetaData* meta);

}  // namespace leveldb

#endif  // STORAGE_LEVELDB_DB_BUILDER_H_
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