From mboxrd@z Thu Jan  1 00:00:00 1970
From: Masahiro Yamada <yamada.m@jp.panasonic.com>
Date: Wed, 19 Feb 2014 18:51:09 +0900
Subject: [U-Boot] [PATCH v8 0/38] Switch over to real Kbuild
In-Reply-To: <CAPnjgZ1-=heQEjwfm1TdVsEVz5BiP-G1tGh+_yBkpsuyUcQsSA@mail.gmail.com>
References: <20140218180236.A12A.AA925319@jp.panasonic.com>
	<CAPnjgZ1-=heQEjwfm1TdVsEVz5BiP-G1tGh+_yBkpsuyUcQsSA@mail.gmail.com>
Message-ID: <20140219185109.A15D.AA925319@jp.panasonic.com>
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To: u-boot@lists.denx.de

Hello Simon,


> > Thanks for your feedback.
> >
> > Hmm, Kbuild is 9 times slower on your computer.
> > This is a big difference. (It was about 1.6 x slower on my box.)
> >
> > I don't know where such a difference came from.
> 
> Note this is a 32-core machine.

You are passing -j1 to the command line in here,

> >> time CROSS_COMPILE=/opt/linaro/gcc-linaro-arm-linux-gnueabihf-4.8-2013.08_linux/bin/arm
> >> -linux-gnueabihf- ARCH=arm make -j1

So you are using only 1 core, right?


> >
> >> There seem to be noticeable pauses between things happening. I'm not
> >> quite sure how to dig into it more. Is it possible that cc-option is
> >> no-longer caching the various compiler options?
> >
> > I guess it's possible.
> >
> > Is sandbox build slow as well?
> > Sandbox has no cc-option.
> > If cc-option is the cause of pauses, sandbox build
> > should be faster.
> 
> Yes actually sandbox is pretty fast.

It's interesting and I want to know how fast.
Could you post the result of Sandbox build?


Best Regards
Masahiro Yamada