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<H1>[Mageia-sysadm] multiple builds on each nodes</H1>
<B>Thomas Backlund</B>
<A HREF="mailto:mageia-sysadm%40mageia.org?Subject=Re%3A%20%5BMageia-sysadm%5D%20multiple%20builds%20on%20each%20nodes&In-Reply-To=%3C4DA32998.6020208%40iki.fi%3E"
TITLE="[Mageia-sysadm] multiple builds on each nodes">tmb at iki.fi
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<I>Mon Apr 11 18:17:28 CEST 2011</I>
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<PRE>nicolas vigier skrev 11.4.2011 18:57:
>><i>
</I>>><i> I removed jonund from buildsystem to run some tests on it. I am
</I>>><i> currently rebuilding kernel and kernel-tmb at the same time on it.
</I>>><i>
</I>>><i> And it seems the CPU does not spend a lot of time waiting for IO :
</I>>><i> Cpu(s): 94.2%us, 5.8%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
</I>>><i> Mem: 8181404k total, 7710776k used, 470628k free, 427864k buffers
</I>>><i> Swap: 8185076k total, 85332k used, 8099744k free, 4996808k cached
</I>>><i>
</I>
Yeah, sorry, I wasn't clear enough... as seen below:
>><i> When this is finished, I will rebuild kernel and kernel-tmb separatly
</I>>><i> to compare time.
</I>><i>
</I>><i> So the logs of build of kernel and kernel-tmb at the same time :
</I>><i> Mon Apr 11 15:26:44 CEST 2011 : startbuild for kernel-2.6.38.2-4.mga1
</I>><i> Mon Apr 11 15:27:01 CEST 2011 : startbuild for kernel-tmb-2.6.38.2-1.mga1
</I>><i> Mon Apr 11 16:17:26 CEST 2011 : endbuild for kernel-tmb-2.6.38.2-1.mga1
</I>><i> Mon Apr 11 17:43:47 CEST 2011 : endbuild for kernel-2.6.38.2-4.mga1
</I>><i>
</I>><i> It took 50 minutes to rebuild kernel-tmb (with kernel building at the
</I>><i> same time).
</I>><i>
</I>><i> And 2 hours and 17 minutes to rebuild kernel (with kernel-tmb building
</I>><i> during the first 50 minutes).
</I>><i>
</I>><i> It seems most of the time to rebuild kernel package was spent to install
</I>><i> files and generate all binary packages.
</I>><i>
</I>
Yep, it takes 2 kernel builds to get all cpus maxed out on jonund
and here is where the io comes in:
during unpackaging and repackaging of big tarballs, and when compressing
the modules and generating the binary rpms (especially kernel -debug
rpms are huge)... at this point cpu goes down and io is kept busy...
So here it would help if the other build would be running on another disk...
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