[Solved]Using multiple cores of a dual/quad-core for compiling code ?

Skripka · 2010-02-20 03:13:35

Title basically says it all.

Was playing around with Firefox-PGO PKGBUILDS, and compiling 50MB of source code, even on my quad core takes a long time...only for the compiler to crash, and have to start again to try to get a usable package. So, I was wondering if it is possible to actually use more than 1 out of my 4 CPU cores in compiling source code?

Nada on the forums yet, or in the Wiki that I could find.

Last edited by Skripka (2010-02-20 03:25:00)

Allan · 2010-02-20 03:22:03

MAKEFLAGS="-j5" in /etc/makepkg.conf will use them all.

Edit: warning - some packages do not like this and you need to add options=('!makeflags') to the PKGBUILD.

Skripka · 2010-02-20 03:24:27

Ooo...thx Allan

beroal · 2010-02-20 03:52:10

Allan wrote:

Can I add MAKEFLAGS="-j5" to PKGBUILD?

Allan · 2010-02-20 04:12:04

beroal wrote:

Allan wrote:
Can I add MAKEFLAGS="-j5" to PKGBUILD?

No I didn't...

Anyway, better to add it to makepkg.conf as the number is normally the number of cores + 1, so is specific to the computer.

ScottArch · 2010-03-09 22:49:14

Hi,

Just wanted to chime in with a quick question. I have a Core 2 Duo T7300 and /proc/cpuinfo suggests that I have 2 CPU's, but 4 cores, would that be j3 or a j5 MAKEFLAGS?

Cheers

DarksideEE7 · 2010-08-21 23:24:58

ScottArch wrote:

Hi,
Just wanted to chime in with a quick question. I have a Core 2 Duo T7300 and /proc/cpuinfo suggests that I have 2 CPU's, but 4 cores, would that be j3 or a j5 MAKEFLAGS?
Cheers

Well this is an old thread, but I searching trying to confirm this from memory:

options=('!makeflags')

Anyhow since nobody answered your question, you in fact have 1 physical CPU with 2 cores. You have 2 threads as well since the Core architecture didn't do hyperthreading. Thus you should use

MAKEFLAGS='-j3'

This is what I use on my laptop with a Core 2 Duo CULV U7300, which is essentially the same CPU as yours except lower voltage and frequency.

So I added -j5 to my MAKEFLAGS on my Q6600 and I've already run into a failed build on package qt4-qtruby. Is this fairly common, and if so then is there any way of knowing that the build won't be able to utilize the extra cores by reading the PKGBUILD before actually building?

It would be nice to use all 4 cores...I mean I don't have this overclocked and watercooled PC for looks )

Last edited by DarksideEE7 (2010-08-22 06:56:52)

Arch Linux

#1 2010-02-20 03:13:35

[Solved]Using multiple cores of a dual/quad-core for compiling code ?

#2 2010-02-20 03:22:03

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

#3 2010-02-20 03:24:27

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

#4 2010-02-20 03:52:10

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

#5 2010-02-20 04:12:04

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

#6 2010-03-09 22:49:14

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

#7 2010-08-21 23:24:58

Re: [Solved]Using multiple cores of a dual/quad-core for compiling code ?

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