Re: Server Technical Specification: Agenda and First Draft

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On Sun, Mar 02, 2014 at 04:05:27PM +0000, Richard W.M. Jones wrote:
> On Sat, Mar 01, 2014 at 02:58:41PM +0530, Kashyap Chamarthy wrote:

[. . .]

> > 
> > A single `make` job timing to compile everything on a systemd-nspawn:
> > 
> >     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
> 
> These results don't make much sense to me.  I would expect make to
> take a similar time on both.

Hmm, I didn't start out with comparisions as I was testing it for the
first time. I'll conduct another test (more carefully, this time) with
newest systemd from Rawhide and see how it fares. (Also, will try with a
libvirt-lxc and report how it goes.)

> 
> Do you have a proxy/cache that could be caching the RPMs that
> yumdownloader fetches during the build?

I don't have a proxy/cache (should really make one!). However the Fedora
mirror is on the same network of the machine where I the test on.

> 
> Did you do the second build in the same directory as the first build?

No, it's done in my home dir -- ~/kashyapc/src/libguestfs. First one is
in /src/test-container 

> 'make clean' intentionally doesn't clean up some things like the
> appliance and test images which require lengthy rebuilds.  You have to
> use 'make maintainer-clean' or 'make distclean' instead.
> 
> libguestfs make (and especially 'make check') is a good stress-test,
> but it's too complicated and irreproducible to be a good benchmark.

Yeah, trying to report benchmarks is always tricky.

Answering drago01's questions from the other email:
  
  - Order: first I ran the compile test via nspawn container; next, run
    the same test on the in my home dir (on the host)
  - No, I didn't reboot in between
  - Haven't cleared caches (I presume you meant to free the pagecache 
    -- $ echo 3 > /proc/sys/vm/drop_caches)


-- 
/kashyap
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