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<H1>[Mageia-sysadm] multiple builds on each nodes</H1>
<B>nicolas vigier</B>
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TITLE="[Mageia-sysadm] multiple builds on each nodes">boklm at mars-attacks.org
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<I>Mon Apr 11 17:57:54 CEST 2011</I>
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<PRE>On Mon, 11 Apr 2011, nicolas vigier wrote:
><i> On Sun, 10 Apr 2011, Thomas Backlund wrote:
</I>><i>
</I>><i> > lör 2011-04-09 klockan 17:55 +0300 skrev nicolas vigier:
</I>><i> > > Hello,
</I>><i> > >
</I>><i> > > ulri is now running two builds on each node at the same time.
</I>><i> > >
</I>><i> > > This improve a lot the average time to have a package built, when a big
</I>><i> > > package like libreoffice is in the queue.
</I>><i> >
</I>><i> >
</I>><i> > Well, many of the bigger builds are io bound and not cpu bound
</I>><i> >
</I>><i> > For example a kernel build isn't capable of using all cpu power
</I>><i> > available due to io starvation...
</I>><i> >
</I>><i> > So IMHO we should add a second disc to both buildnodes and move the
</I>><i> > second buildbot to the new disc to share the io load.
</I>><i> >
</I>><i> > An other option is of course to set basesystem as raid1 and use the rest
</I>><i> > of the disks in raid0 to get faster io too...
</I>><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>><i> When this is finished, I will rebuild kernel and kernel-tmb separatly
</I>><i> to compare time.
</I>
So the logs of build of kernel and kernel-tmb at the same time :
Mon Apr 11 15:26:44 CEST 2011 : startbuild for kernel-2.6.38.2-4.mga1
Mon Apr 11 15:27:01 CEST 2011 : startbuild for kernel-tmb-2.6.38.2-1.mga1
Mon Apr 11 16:17:26 CEST 2011 : endbuild for kernel-tmb-2.6.38.2-1.mga1
Mon Apr 11 17:43:47 CEST 2011 : endbuild for kernel-2.6.38.2-4.mga1
It took 50 minutes to rebuild kernel-tmb (with kernel building at the
same time).
And 2 hours and 17 minutes to rebuild kernel (with kernel-tmb building
during the first 50 minutes).
It seems most of the time to rebuild kernel package was spent to install
files and generate all binary packages.
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