Parallel compile through command prompt 

1. change the directory to the path where axbuild.exe file exits

Eg : cd E:\Program Files\Microsoft Dynamics AX\60\Server\MicrosoftDynamicsAX\bin

2. Run the following command

Eg: E:\Program Files\Microsoft Dynamics AX\60\Server\MicrosoftDynamicsAX\bin>axbuild.exe xppcompileall /aos=01 /altbin="E:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin" /workers=6