Add a compile option for grpc?

[luotao1]

Can we add a compile option for grpc? If we build and run on local machine which don't need distributed computing, we can choose not to compile send_op/recv_op and some related codes.

[chengduoZH]

I want to ask this too.

[typhoonzero]

Yep, will add. Is the option name WITH_DISTRB OK?

[luotao1]

How about use the full name WITH_DISTRIBUTE?

[typhoonzero]

Sure, will use WITH_DISTRIBUTE.