I want to learn some system infos of Android, and found a strange place.

1, environment:
ubuntu 12.04  + openjdk-7
source :  repo init -u https://android.googlesource.com/platform/manifest 
-b android-5.1.1_r25 
        make   :  
source build/envsetup.sh
lunch asop_x86-eng
make -j4
build success and run emualator is OK
ls -h 0.work/out/target/product/generic_x86/system.img 
750MB

2, then I checked the google sdk 
ls -h ~/bin/android-sdk/system-images/android-22/default/x86/system.img 
850MB, is about 100M big than mine
   I checked the two "installed-files.txt" files, found many different file 
names.

   Why why my compiled system.img is different from google official 
system.img?

3, I run the emulator, found the process name is emulator64-x86, when I use 
official tools create avd, found the process name is qemu-system-i386.
  It's different emulators, why?

4, I wanted to use my compiled system.img to replace official system.img, 
when I run the emulator, it failed.

So, did I do something wrong? Why can't make the same system.img like 
official system.img?

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