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audiodef
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 Posted: Wed Oct 06, 2010 8:38 pm Post subject: MAKEOPTS values |
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The Gentoo handbook says that a general rule-of-thumb for MAKEOPTS is the number of CPUs + 1. So if I have a 6-core Phenom II, I should set MAKEOPTS="-j7", right?
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John R. Graham
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| Posted: Wed Oct 06, 2010 8:48 pm Post subject: |
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Yes, that's the general rule. The goal, however, is to start enough compiles so that you have all your cores working on something but don't cause virtual memory thrashing. Start wih the "general rule" number; then, if you see idle cores, increase the number; if you see thrashing, then decrease it.
- John
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audiodef
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krinn
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| Posted: Wed Oct 06, 2010 10:27 pm Post subject: |
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you better set the job options too.
- the makeopts = number of gcc i can run when building one program
- the jobs = number of programs i'm allow to build at the same time.
So the makeopts = 0 benefits if the make file only have 1 file to build (it's rarely the case, but you'll see it's also rarely the case a makefile "could" run more than 5 gcc at the same time, because many files depend on previous ones build in order to be process
And the jobs = 0 benefits if you have only 1 program to build, and of course max when doing emerge -e world
EMERGE_DEFAULT_OPTS="-j6" |
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audiodef
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Hu
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| Posted: Thu Oct 07, 2010 2:39 am Post subject: |
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| krinn wrote: | | So the makeopts = 0 benefits if the make file only have 1 file to build (it's rarely the case, but you'll see it's also rarely the case a makefile "could" run more than 5 gcc at the same time, because many files depend on previous ones build in order to be process |
This depends heavily on the build system. Some build systems are poorly written and get very little parallelism. Others specify dependencies that allow make a great deal of freedom, and can spin off one gcc per file that needs compilation, even if that means more than a dozen parallel compiler processes. |
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audiodef
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| Posted: Thu Oct 07, 2010 1:12 pm Post subject: |
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It looks like my new machine has no trouble with parallel compilations. Emerge seems very zippy even with several compiles going on at once.
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d2_racing
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| Posted: Thu Oct 07, 2010 5:33 pm Post subject: |
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I'm using that setup for almost 2 years now with my Intel QuadCore Q9550:
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MAKEOPTS="-j5 -l5"
EMERGE_DEFAULT_OPTS="--jobs=5 --load-average=5.0 --with-bdeps y"
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audiodef
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d2_racing
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| Posted: Thu Oct 07, 2010 7:26 pm Post subject: |
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I took that from Zac Medico 
The only thing that I know, is that when I compile, all my core are working and installing a basic KDE takes only 52 minutes on my box
--with-bdeps y is there to make sure that I compile every deps, so when I emerge -auDNv @world, often I have more packages to build and rebuild.
--jobs=5 --load-average=5.0 is equal to my # of core + 1.
-l5 is an option that Zac Medico documented a while ago. It's a make options. |
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NeddySeagoon
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| Posted: Thu Oct 07, 2010 7:31 pm Post subject: |
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audiodef,
On my Phenom II X3, I use -j5 and --jobs=3. It rarely gets to 6 jobs running and 4G RAM in use.
I have /var/tmp/portage in shmfs too
I have my eye on the X6 upgrade but I have to do a BIOS upgrate to get it to work.
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aCOSwt
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| Posted: Thu Oct 07, 2010 8:24 pm Post subject: |
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| d2_racing wrote: | I took that from Zac Medico
The only thing that I know, is that when I compile, all my core are working and installing a basic KDE takes only 52 minutes on my box
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Well I admit I took this from my... grand-mother only !
However...
I launch simultaneoulsly my boeuf-bourguignon and my emerge kde-meta and mplayer.
And kde-meta build is achieved before my boeuf-bourguignon !
That is why I can exactly tell with the best precision and exactitude that It takes less than 1 hour for KDE to be built on my only-duo core + j3 only !
Well... I admit that... the music can be finished earlier when Martha Argerich is playing !
A shame ! Is'nt it ?
I can accept that your 4 cores are working but... as a matter of fact... what do they actually do ?
Watching the time they spend ? 
Or do you get low-power-low-cost ram ?
Last edited by aCOSwt on Thu Oct 07, 2010 9:07 pm; edited 5 times in total |
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audiodef
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| Posted: Thu Oct 07, 2010 8:29 pm Post subject: |
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| NeddySeagoon wrote: |
I have my eye on the X6 upgrade but I have to do a BIOS upgrade to get it to work. |
From what I'm seeing here, totally worth it!
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