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Android O、N版本修改dex2oat编译选项,减少占用ROM空间或者加快安装速度



内容?(2018-02-09)







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Android O版本、AndroidN版本


1.ROM过大可以通过调整--compiler-filter,减少apk生成odex文件所占据空间的大小,通常来说odex+vdex文件越大,说明dex2oat优化的类越多越彻底,性能也相对较好;


2.Apk安装时间过长可以通过调整--compiler-filter,加快安装;




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修改dex2oat的--compiler-filter选项;


oat_location_为要修改apk的关键字,通常使用包名,比如微信:com.tencent.mm;


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/art/dex2oat/dex2oat.cc


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? void ParseArgs(int argc, char** argv) {


??? original_argc = argc;


??? original_argv = argv;


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??? InitLogging(argv, Runtime::Abort);


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??? // Skip over argv[0].


??? argv++;


??? argc--;


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??? if (argc == 0) {


????? Usage("No arguments specified");


??? }


……


????? } else if (option.starts_with("--dirty-image-objects=")) {


??????? dirty_image_objects_filename_ = option.substr(strlen("--dirty-image-objects=")).data();


????? }? else if (!compiler_options_->ParseCompilerOption(option, Usage)) {


??????? Usage("Unknown argument %s", option.data());


????? }


??? }


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????????? /** MTK begin */


??????????? if(oat_location_ != "" && (oat_location_.find("mtk14456") != std::string::npos || oat_location_.find("com.tencent.mm")!= std::string::npos)){


??????????????????????? LOG(INFO) << "MTK oat_location_=" << oat_location_ << ",SetCompilerFilter=CompilerOptions::kQuicken";


??????????????????????? compiler_options_->SetCompilerFilter(CompilerFilter::kQuicken);


??????????? }


??????????? /** MTK end */


???????????


??? ProcessOptions(parser_options.get());


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??? // Insert some compiler things.


??? InsertCompileOptions(argc, argv);


? }


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下面以Android O版本,微信6.6.2为例:


步骤:


1.下载weixin.apk,重命名为weixin.zip;解压缩,把所有的dex文件push到sdcard


2.adb shell,然后执行下面的命令:


./system/bin/dex2oat --oat-file=/sdcard/mtk14456tools_everything.odex --dex-file=/sdcard/classes.dex --dex-file=/sdcard/classes2.dex --dex-file=/sdcard/classes3.dex?--dex-file=/sdcard/classes4.dex --dex-file=/sdcard/classes5.dex --compiler-filter=everything


    --compiler-filter参数如下:

--compiler-filter=(assume-verified|extract|verify|quicken|space-profile|space|speed-profile|speed|everything-profile|everything)


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通过上面可以得出下面数据:


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Time为安装apk时dex2oat的时间;


Odex表示生成odex文件的大小;


Vdex表示生成vdex文件的大小;


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--compiler-filter

Time

Total size(KB)

Odex(KB)

Vdex(KB)

assume-verified

3.228s

36657

653

36004

extract

2.499s

36657

653

36004

verify

7.616s

36904

653

36251

quicken

9.539s

38978

717

38261

space-profile

7.949s

38978

717

38261

space

27.425s

107608

71321

36287

speed-profile

7.810s

38978

717

38261

speed

52.815s

107608

71321

36287

everything-profile

7.415s

38978

717

38261

everything

53.364s

109544

73281

36263


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表格统计数据是根据下面log和生成在sdcard的odex和vdex得出:


01-01 00:33:58.596 4332-4332/? I/dex2oat: StrippedCommandLine:./system/bin/dex2oat --oat-file=/sdcard/mtk14456tools_everything.odex --dex-file=/sdcard/classes.dex --dex-file=/sdcard/classes2.dex --dex-file=/sdcard/classes3.dex --dex-file=/sdcard/classes4.dex --dex-file=/sdcard/classes5.dex?--compiler-filter=everything


01-01 00:34:51.958 4332-4332/? I/dex2oat:?dex2oat took 53.364s?(341.743s cpu) (threads: 8) arena alloc=27MB (28629200B) java alloc=24MB (25341840B) native alloc=128MB (135004032B) free=29MB (31195264B)



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