Re: [gentoo-user] emerge -j, make -j and make -l

[Dale]

Mark Knecht wrote:
> On Sat, Nov 26, 2011 at 7:22 AM, Michael Mol<mikemol@×××××.com>  wrote:
>> I just wanted to share an experience I had today with optimizing parallel
>> builds after discovering "-l" for Make...
>>
>> I've got a little more tweaking I still want to do, but this is pretty
>> awesome...
>>
>> http://funnybutnot.wordpress.com/2011/11/26/optimizing-parallel-builds/
>>
>> ZZ
> Good post Michael. Thanks.
>
> I want to verify that in make.conf this is indeed MAKEOPTS we are
> talking about and not EMERGE_DEFAULT_OPTS.
>
> Currently for my i7-980x (6 physical cores + hyper threading = 12
> logical cores) I have:
>
> MAKEOPTS="-j3"
> EMERGE_DEFAULT_OPTS="--with-bdeps y "
> PORTAGE_IONICE_COMMAND="ionice -c 3 -p \${PID}"
>
> I generally keep -j small day-to-day to allow emerge to work more or
> less the background while I'm using the machine for other things. If I
> was going to do an emerge -e @world then in the past I'd push it up
> for 13. (N+1)
>
> I've not used the -l option but it sounds interesting. If I understand
> the then you're suggesting in /etc/make.conf
>
> MAKEOPTS="-j13 -l7"
>
> or something in that range for a full blown emerge -e @world?
>
> - Mark
>
>


You should also look into this setting if you want to let portage run in 
the background:

PORTAGE_NICENESS=5

I have a 4 core system and run this:

MAKEOPTS="-j16 -l10"
EMERGE_DEFAULT_OPTS="-j8 "

I can't even tell portage is running.  Heck, I even watch videos and 
such.  No problems with slowdown at all.

Oh, the -l10 is sort of new.  The -j16 is changing a bit over time.  
Trying to test speed to see what is fastest.  So far, no compile race 
problems either.

Dale

:-)  :-)

-- 
I am only responsible for what I said ... Not for what you understood or how you interpreted my words!