how to use the MFS ?

[chris.scott]

Wojciech Puchar wrote:
>> hi all:
>>
>>      i want to know ,how to compile better speed during the 
>> installation of
>> Ports , use the memery filesystem(MFS) ..
>>
>>      during make world , mount the md0 to /usr/obj , but what can i 
>> do for
>
> better use tmpfs
>
>> the port ?
>
> rm -rf /usr/ports/
> mkdir /usr/ports
> mount -t tmpfs tmpfs /usr/ports
> portsnap extract
>
> now build
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quicker to do


mv /usr/ports /usr/ports.real
mkdir /usr/ports
mount -t tmpfs tmpfs /usr/ports
mount -t unionfs -o noatime /usr/ports /usr/ports.real


of cause tmpfs can actually start using disk space unlike a md device so 
if you eat up to much ram with the compiles it will slow down