Windows上面编译和简单测试一下leveldb-1.9.0

怼烎@ 2022-09-20 11:24 216阅读 0赞

[http://gmd20.blog.163.com/blog/static/1684392320131733835919/][http_gmd20.blog.163.com_blog_static_1684392320131733835919]

已经port到windows 平台了，不过在官网下载的源码包是不能直接编译的

https://code.google.com/p/leveldb/downloads/list

官方的git 里面有windows的分支，不过很遗憾，由于我们伟大的防火墙，git clone不下来。不过看在线的源码，应该里面的源码也是不完整的。

不过那个分支下面有个Windows的编译文档的说明 https://code.google.com/p/leveldb/source/browse/WINDOWS?name=windows

1.  在vc里面创建 动态链接库工程，指定已经存在的目录，直接把leveldb的源文件导入项目里面。

2.  配置 boost 和 leveldb的include目录

3. 添加预定义宏， LEVELDB\_PLATFORM\_WINDOWS 和 OS\_WIN

4.  到官方的 windows 分支，和 这里 http://code.google.com/r/kkowalczyk-leveldb/source/browse/\#git%2Fwin 找到下面这些文件，添加到 leveldb的目录和工程里面去。

utill/env\_win.cc

util/win\_logger.h

utl/win\_logger.cc

port/port\_win.h

port/port\_win.cc

修改

port.h

加上 Windows平台的头文件     port/port\_win.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_PORT_PORT_H_
    #define STORAGE_LEVELDB_PORT_PORT_H_
    
    #include <string.h>
    
    // Include the appropriate platform specific file below. If you are
    // porting to a new platform, see "port_example.h" for documentation
    // of what the new port_<platform>.h file must provide.
    #if defined(LEVELDB_PLATFORM_POSIX)
    # include "port/port_posix.h"
    #elif defined(LEVELDB_PLATFORM_CHROMIUM)
    # include "port/port_chromium.h"
    #elif defined(LEVELDB_PLATFORM_WINDOWS) # include "port/port_win.h"
    #endif
    
    #endif // STORAGE_LEVELDB_PORT_PORT_H_

参考 port\_posix.h 修改。

port/port\_win.h

port/port\_win.cc

加上  InitOnce 的声明和定义

// Thread-safe initialization. // Used as follows: // static port::OnceType init_control = LEVELDB_ONCE_INIT; // static void Initializer() { ... do something ...; } // ... // port::InitOnce(&init_control, &Initializer); typedef long OnceType; #define LEVELDB_ONCE_INIT 0 extern void InitOnce(port::OnceType*, void (*initializer)());
     //----------------cpp-----------------------------------  void InitOnce(OnceType* once, void (*initializer)()) { if (InterlockedCompareExchange (once, 1,0) == 0 ) { initializer(); } }

5.  修复头文件 包含的错误  unistd.h

#ifdef WIN32
    #include <io.h>
    #include <process.h>
    #else
    #include <unistd.h>
    #endif

6. 从项目里面移除所有 xxx\_text.c c  xxxx\_bench.cc 测试和性能测试相关源文件。

7. 从 http://code.google.com/r/kkowalczyk-leveldb/source/browse/\#git%2Fwin 复制dll导出符号定义文件。

工程属性 -》  linker -》 input -》 module definition file指定导出符号文件。

LIBRARY libleveldb
    EXPORTS
    
     ; db operations
     leveldb_open
     leveldb_close
     leveldb_put
     leveldb_delete
     leveldb_write
     leveldb_get
     leveldb_create_iterator
     leveldb_create_snapshot
     leveldb_release_snapshot
     leveldb_property_value
     leveldb_approximate_sizes
    
     ; management
     leveldb_destroy_db
     leveldb_repair_db
    
     ; iterator
     leveldb_iter_destroy
     leveldb_iter_valid
     leveldb_iter_seek_to_first
     leveldb_iter_seek_to_last
     leveldb_iter_seek
     leveldb_iter_next
     leveldb_iter_prev
     leveldb_iter_key
     leveldb_iter_value
     leveldb_iter_get_error
    
     ; write batch
     leveldb_writebatch_create
     leveldb_writebatch_destroy
     leveldb_writebatch_clear
     leveldb_writebatch_put
     leveldb_writebatch_delete
     leveldb_writebatch_iterate
    
     ; options
     leveldb_options_create
     leveldb_options_destroy
     leveldb_options_set_comparator
     leveldb_options_set_create_if_missing
     leveldb_options_set_error_if_exists
     leveldb_options_set_paranoid_checks
     leveldb_options_set_env
     leveldb_options_set_info_log
     leveldb_options_set_write_buffer_size
     leveldb_options_set_max_open_files
     leveldb_options_set_cache
     leveldb_options_set_block_size
     leveldb_options_set_block_restart_interval
    
     ; compression
     leveldb_options_set_compression
    
     ; comparator
     leveldb_comparator_create
     leveldb_comparator_destroy
    
     ; read options
     leveldb_readoptions_create
     leveldb_readoptions_destroy
     leveldb_readoptions_set_verify_checksums
     leveldb_readoptions_set_fill_cache
     leveldb_readoptions_set_snapshot
    
     ; write options
     leveldb_writeoptions_create
     leveldb_writeoptions_destroy
     leveldb_writeoptions_set_sync
    
     ; cache
     leveldb_cache_create_lru
     leveldb_cache_destroy
    
     ; env
     leveldb_create_default_env
     leveldb_env_destroy
    
     ; misc
     leveldb_free

编译得到 dll和lib文件，根据源码目录下  c\_test.cc 写个简单的测试。

#include "leveldb/c.h" 
     
    
     leveldb_t* db;
     leveldb_comparator_t* cmp;
     leveldb_cache_t* cache;
     leveldb_env_t* env;
     leveldb_options_t* options;
     leveldb_readoptions_t* roptions;
     leveldb_writeoptions_t* woptions;
     char* err = NULL;
    
    
     env = leveldb_create_default_env();
     cache = leveldb_cache_create_lru(100000);
    
     options = leveldb_options_create();
     // leveldb_options_set_comparator(options, cmp);
     //leveldb_options_set_error_if_exists(options, 1);
     //leveldb_options_set_cache(options, cache);
     //leveldb_options_set_env(options, env);
     //leveldb_options_set_info_log(options, NULL);
     //leveldb_options_set_write_buffer_size(options, 100000);
     //leveldb_options_set_paranoid_checks(options, 1);
     //leveldb_options_set_max_open_files(options, 10);
     //leveldb_options_set_block_size(options, 1024);
     //leveldb_options_set_block_restart_interval(options, 8);
     leveldb_options_set_compression(options, leveldb_no_compression);
    
     //roptions = leveldb_readoptions_create();
     //leveldb_readoptions_set_verify_checksums(roptions, 1);
     //leveldb_readoptions_set_fill_cache(roptions, 0);
     
    
     woptions = leveldb_writeoptions_create();
     //leveldb_writeoptions_set_sync(woptions, 1); //同步写非常慢
     leveldb_writeoptions_set_sync(woptions, 0);
    
     leveldb_destroy_db(options, "D:/Trace/test.db" , &err);
     
     leveldb_options_set_create_if_missing(options, 1);
     db = leveldb_open(options, "D:/Trace/test.db", &err);
     
    
     
     leveldb_put(db, woptions, "foo", 3, "hello", 5, &err);
     //leveldb_writebatch_t* wb = leveldb_writebatch_create();
     //leveldb_writebatch_put(wb, "foo", 3, "a", 1);
     //leveldb_writebatch_clear(wb);
     //leveldb_writebatch_put(wb, "bar", 3, "b", 1);
     //leveldb_writebatch_put(wb, "box", 3, "c", 1);
     //leveldb_writebatch_delete(wb, "bar", 3);
     //leveldb_write(db, woptions, wb, &err);
    
    
    
     char data [200];
     char key[64];
    
     QueryPerformanceCounter(&t0);
     unsigned long last_time = GetTickCount();
     unsigned long max_time =0;
    
     int i, j;
     for (i=0; i< 5000000; i++) { 
     //UpdateTimeString(date,64);
     itoa(i, key,10);
     leveldb_put(db, woptions,key,strlen(key) , data, 200, &err);
    
     unsigned long time = GetTickCount(); 
     unsigned long max = time - last_time;
     last_time = time;
     if (max > max_time) { 
     max_time = max;
     }
     }
    
     QueryPerformanceCounter(&t1);
    
     std::cout << "最大耗时 " << max_time << " 毫秒" << endl;
     unsigned long time = (((t1.QuadPart-t0.QuadPart)*1000000)/freq.QuadPart);
     std::cout << "执行 " << i <<" 次， 耗时 " << time << " 微秒" << std::endl;

顺序的  200个字节长度的写入测试

统计的单操作 最大耗时 1406 毫秒        。 这个异步操作还是会有耗时1秒 2秒的等待啊.

执行 5000000 次， 耗时 182999432 微秒，平均每个操作耗时36.6微秒。

cpu利用率很低，5%到25%左右，另外一次测死看到平均每个写入操作耗时34.1479 微秒

可以看到每秒30M左右的写入速度（好像我用的这个电脑磁盘比较性能非常差）。如果写入缓存比较小，可看到很多磁盘读操作，这个在磁盘上做merge？

跟官方网站

fillseq      :       1.765 micros/op;   62.7 MB/s

的数据 还比较大的差距，可能和那些参数配置相关吧。

不同的参数有影响写入速度的稳定性。

其中write buffer大小，如果比较小的话，读操作很多。如果设置write buffer 为100M，写操作几乎咩有。

![Windows上面编译测试leveldb-1.9.0 - widebright - widebright的个人空间][Windows_leveldb-1.9.0 - widebright - widebright]

![Windows上面编译测试leveldb-1.9.0 - widebright - widebright的个人空间][Windows_leveldb-1.9.0 - widebright - widebright 1]

[http_gmd20.blog.163.com_blog_static_1684392320131733835919]: http://gmd20.blog.163.com/blog/static/1684392320131733835919/
[Windows_leveldb-1.9.0 - widebright - widebright]: http://img6.ph.126.net/SVBdmvxHWKbipR4WZyoPuA==/2518356616648324906.jpg
[Windows_leveldb-1.9.0 - widebright - widebright 1]: http://img4.ph.126.net/nuU6Wb7xSidV9KRXc3arWQ==/6597384226983934484.jpg