Re: [edk2-devel] [PATCH] OvmfPkg: enable multiprocessor builds when using build.sh

["Laszlo Ersek" <lersek@redhat.com>]

On 07/23/19 02:00, Rebecca Cran wrote:
> On 2019-07-22 17:14, Jordan Justen wrote:
>>
>> I was suggesting that if they didn't specify -n as a param to
>> build.sh, then build.sh should not send -n to the edk2 build command.
>> The effect would be for the edk2 build command to check
>> Conf/target.txt. By default, I think target.txt will not set
>> THREADNUMBER, so "0" would still be the result.
>>
>> Yet, it would give them the option to set it in Conf/target.txt.
>> Today, since we always use the -n param, target.txt is always ignored
>> for this parameter.
> 
> 
> On a related topic, I wonder if we should add a "-j" parameter if we
> build BaseTools for users (e.g. "make -j4 -C BaseTools")? I've found
> that it can be pretty slow without it: on my system adding -j4 reduces
> build time from 55 seconds to 15. Going higher doesn't seem to produce
> much more benefit: -j32 (on a ThreadRipper system) reduces it to 12 seconds.
> 
> 

Passing

  -j $(getconf _NPROCESSORS_ONLN)

to "make" (for building BaseTools) makes sense, IMO.

Thanks
Laszlo