cocos2d 文件系统使用文件内存映射性能对比

//cocos 修改代码

.....

//性能测试代码

extern "C" {

#include <time.h>

#include <stdlib.h>

#include <stdio.h>

    void ptest(){

        auto TimeDiff = [](std::function<void()> func,const char* msg){

            clock_t t1 , t2;

            t1 = clock();

            func();

            t2 = clock();

            CCLOG(msg,t2-t1);

        };

        

        auto writef = [](const char* path,int len){

            FILE* fp = fopen(path, "wr+");

            unsigned char* c = (unsigned char*)malloc(len);

            memset(c, 'T', len);

            fwrite(c, 1, len, fp);

            fflush(fp);

            fclose(fp);

            fp =nullptr;

        };

        

        auto readfile = [](const char* path){

            std::string src("src/ptest/datas/");

            src.append(path);

            FileUtils::getInstance()->getStringFromFile(src);

        };

        

        auto readfilea = [](const char* path){

            std::string src(FileUtils::getInstance()->getWritablePath());

            src.append("/");

            src.append(path);

            FileUtils::getInstance()->getStringFromFile(src);

        };

        

        std::string writepath = FileUtils::getInstance()->getWritablePath();

        

        auto fullpath = [](std::string path,const char* str){ path.append(str); return path; };

        

        writef(fullpath(writepath,"128B.s").c_str(),128);

        writef(fullpath(writepath,"512B.s").c_str(),512);

        writef(fullpath(writepath,"2K.s").c_str(),2*1024);

        writef(fullpath(writepath,"4K.s").c_str(),4*1024);

        writef(fullpath(writepath,"16K.s").c_str(),16*1024);

        writef(fullpath(writepath,"512K.s").c_str(),512*1024);

        writef(fullpath(writepath,"1M.s").c_str(),1*1024*1024);

        writef(fullpath(writepath,"2M.s").c_str(),2*1024*1024);

        writef(fullpath(writepath,"5M.s").c_str(),5*1024*1024);

        writef(fullpath(writepath,"10M.s").c_str(),10*1024*1024);

        writef(fullpath(writepath,"20M.s").c_str(),20*1024*1024);

        

        //read

        TimeDiff([&](){ readfile("128B.s"); },"assert 128 bytes time:%d");

        TimeDiff([&](){ readfilea("128B.s"); },"Writable 128 bytes time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("512B.s"); },"assert 512 bytes time:%d");

        TimeDiff([&](){ readfilea("512B.s"); },"Writable 512 bytes time:%d"); CCLOG("");

        TimeDiff([&](){ readfile("2K.s"); },"assert 2k bytes time:%d");

        TimeDiff([&](){ readfilea("2K.s"); },"Writable 2k bytes time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("4K.s"); },"assert 4k bytes time:%d");

        TimeDiff([&](){ readfilea("4K.s"); },"Writable 4k bytes time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("16K.s"); },"assert 16k bytes time:%d");

        TimeDiff([&](){ readfilea("16K.s"); },"Writable 16k bytes time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("512K.s"); },"assert 512K bytes time:%d");

        TimeDiff([&](){ readfilea("512K.s"); },"Writable 512K bytes time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("1M.s"); },"assert 1M.s bytes time:%d");

        TimeDiff([&](){ readfilea("1M.s"); },"Writable 1M.s time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("2M.s"); },"assert 2M.s bytes time:%d");

        TimeDiff([&](){ readfilea("2M.s"); },"Writable 512K time:%d"); CCLOG("");

        

        TimeDiff([&](){ readfile("5M.s"); },"assert 5M.s bytes time:%d");

        TimeDiff([&](){ readfilea("5M.s"); },"Writable 5M.s time:%d"); CCLOG("");

        TimeDiff([&](){ readfile("10M.s"); },"assert 10M.s bytes time:%d");

        TimeDiff([&](){ readfilea("10M.s"); },"Writable 10M.s time:%d"); CCLOG("");

        TimeDiff([&](){ readfile("20M.s"); },"assert 20M.s bytes time:%d");

        TimeDiff([&](){ readfilea("20M.s"); },"Writable 20M.s time:%d"); CCLOG("");

    

    }

}

结果对比：

assert 128 bytes time:1951

Writable 128 bytes time:544

assert 512 bytes time:939

Writable 512 bytes time:0

assert 2k bytes time:1153

Writable 2k bytes time:374

assert 4k bytes time:883

Writable 4k bytes time:0

assert 16k bytes time:1244

Writable 16k bytes time:0

assert 512K bytes time:3366

Writable 512K bytes time:1958

assert 1M.s bytes time:4856

Writable 1M.s time:2206

assert 2M.s bytes time:12929

Writable 512K time:4581

assert 5M.s bytes time:27459

Writable 5M.s time:20102

assert 10M.s bytes time:38956

Writable 10M.s time:24224

//=====================================

cocos2d 测试代码

//#ifdef s

////内存映射测试

//extern "C" {

//#include <time.h>

//#include <stdlib.h>

//#include <stdio.h>

//    void ptest(){

//        auto TimeDiff = [](std::function<void()> func,const char* msg){

//            clock_t t1 , t2;

//            t1 = clock();

//            func();

//            t2 = clock();

//            CCLOG(msg,t2-t1);

//        };

//

//        auto writef = [](const char* path,int len){

//            FILE* fp = fopen(path, "wr+");

//            unsigned char* c = (unsigned char*)malloc(len);

//            memset(c, 'T', len);

//            fwrite(c, 1, len, fp);

//            fflush(fp);

//            fclose(fp);

//            fp =nullptr;

//        };

//

//        auto readfile = [](const char* path){

//            std::string src("src/ptest/datas/");

//            src.append(path);

//            FileUtils::getInstance()->getStringFromFile(src);

//        };

//

//        auto readfilea = [](const char* path){

//            std::string src(FileUtils::getInstance()->getWritablePath());

//            src.append("/");

//            src.append(path);

//            FileUtils::getInstance()->getStringFromFile(src);

//        };

//

//

//        std::string writepath = FileUtils::getInstance()->getWritablePath();

//

//        auto fullpath = [](std::string path,const char* str){ path.append(str); return path; };

//

//        writef(fullpath(writepath,"128B.s").c_str(),128);

//        writef(fullpath(writepath,"512B.s").c_str(),512);

//        writef(fullpath(writepath,"2K.s").c_str(),2*1024);

//        writef(fullpath(writepath,"4K.s").c_str(),4*1024);

//        writef(fullpath(writepath,"16K.s").c_str(),16*1024);

//        writef(fullpath(writepath,"512K.s").c_str(),512*1024);

//        writef(fullpath(writepath,"1M.s").c_str(),1*1024*1024);

//        writef(fullpath(writepath,"2M.s").c_str(),2*1024*1024);

//        writef(fullpath(writepath,"5M.s").c_str(),5*1024*1024);

//        writef(fullpath(writepath,"10M.s").c_str(),10*1024*1024);

//        writef(fullpath(writepath,"20M.s").c_str(),20*1024*1024);

//

//        //read

//        TimeDiff([&](){ readfile("128B.s"); },"assert 128 bytes time:%d");

//        TimeDiff([&](){ readfilea("128B.s"); },"Writable 128 bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("512B.s"); },"assert 512 bytes time:%d");

//        TimeDiff([&](){ readfilea("512B.s"); },"Writable 512 bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("2K.s"); },"assert 2k bytes time:%d");

//        TimeDiff([&](){ readfilea("2K.s"); },"Writable 2k bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("4K.s"); },"assert 4k bytes time:%d");

//        TimeDiff([&](){ readfilea("4K.s"); },"Writable 4k bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("16K.s"); },"assert 16k bytes time:%d");

//        TimeDiff([&](){ readfilea("16K.s"); },"Writable 16k bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("512K.s"); },"assert 512K bytes time:%d");

//        TimeDiff([&](){ readfilea("512K.s"); },"Writable 512K bytes time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("1M.s"); },"assert 1M.s bytes time:%d");

//        TimeDiff([&](){ readfilea("1M.s"); },"Writable 1M.s time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("2M.s"); },"assert 2M.s bytes time:%d");

//        TimeDiff([&](){ readfilea("2M.s"); },"Writable 2M.s time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("5M.s"); },"assert 5M.s bytes time:%d");

//        TimeDiff([&](){ readfilea("5M.s"); },"Writable 5M.s time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("10M.s"); },"assert 10M.s bytes time:%d");

//        TimeDiff([&](){ readfilea("10M.s"); },"Writable 10M.s time:%d"); CCLOG("");

//

//        TimeDiff([&](){ readfile("20M.s"); },"assert 20M.s bytes time:%d");

//        TimeDiff([&](){ readfilea("20M.s"); },"Writable 20M.s time:%d"); CCLOG("");

//

//    }

//}

//#endif

assert 20M.s bytes time:85986

Writable 20M.s time:50815