[Libguestfs] Notes on building libguestfs in a systemd-nspawn container

[Richard W.M. Jones]

On Thu, Jan 30, 2014 at 11:50:35AM +0530, Kashyap Chamarthy wrote:
> > - Single `make` job timing to compile everything:
> > 
> >     real    31m9.792s
> >     user    17m18.359s
> >     sys     13m17.868s
> 
> For comparison, on the _host_, the same single `make` job timing:
> 
>     real    13m41.440s
>     user    13m5.816s
>     sys     1m9.911s

This is timing the build only?

I'm surprised it is slower in the container.  Is memory or # CPUs
limited?

> > 
> > - `make -k check` is still running as I write this, albeit
> >    a bit slow.
> 
> This just finished (in the container):
> 
>     [. . .]
>     grep -v -E '^(examples|gnulib|perl/(blib|examples)|po-docs|tests)/' | \
>     grep -v -E '/((guestfs|rc)_protocol\.c)$' | \
>     LC_ALL=C sort > po/POTFILES
>     cd .; \
>     find builder mllib resize sparsify sysprep -name '*.ml' | \
>     LC_ALL=C sort > po/POTFILES-ml
>     make[1]: Leaving directory `/root/libguestfs'
>     make: *** [check-recursive] Error 1
>       GEN      public-submodule-commit
>     make: Target `check' not remade because of errors.
> 
>     real    474m53.630s
>     user    325m54.254s
>     sys     205m58.032s
> 
>     -bash-4.2# git log | head -1
>     commit c841d08d7084db69e81614d54423686cf0566ad6
> 
> 
> Again, for comparison, `make -k check` on _host_:
> 
>     real    63m1.078s
>     user    54m39.393s
>     sys     12m8.130s

Is KVM available in the container?  I've never tried that actually ..

I suppose the next step is to make LIBGUESTFS_BACKEND=libvirt:lxc:///
work!

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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