本文介绍了一种通过利用多核CPU并行处理能力的方法来显著提高Android项目的编译速度。作者拥有配备i5第二代四核处理器及2GB DDR3内存的计算机配置，在使用make-j4命令进行编译时，将原本耗时1小时44分钟的编译过程缩短至52分钟，效率提升了一倍。文章强调了每次编译前执行make clean的重要性。
make -jN，cpu有几个核N就填几
Test:
my computer configuration is i5+2G DDR3 , the 2nd i5 is 4 core cpu , so I can completed compile android by make -j4.
Before every compile , must make clean so as to be completed compiled.
When make -j4 , start time is 2011-10-30 13:44 , end time is 2011-10-30 14:36 , the whole time is 52 minutes.
But use method of make , the whole time is 1小时44分钟 , so the spare time is 52 , only half .
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