On Wed, Nov 21, 2012 at 6:44 PM, Derek Gaston <fried...@gmail.com> wrote:
> I simply stated that the new system, for me, is frustrating.
>
Fair enough.
> Since you are asking, let me give you an example:
>
> In the old system, this was my libMesh workflow.
>
> svn up
> ./configure && make -j24 && METHOD=dbg make -j24
>
> Then, I would make a change in some file in libMesh and rebuild using:
>
> make && METHOD=dbg make
>
> Nothing is simpler than that.
>
> Now let's examine the new system:
>
> svn up
> ./bootstrap # if even possible
> mkdir build_opt
> cd build_opt
> ../configure --prefix=~/libmesh_install
> make -j24
> make install
> cd ..
> mkdir build_dbg
> cd build_dbg
> export METHOD=dbg
> ../configure --prefix=~/libmesh_install
> make -j24
> make install
>
The only difference between this and the former build system is the extra
cd's (minor annoyance) and make install (nice new feature, IMHO, that was
not present in the previous build system).
> Then I go make a change to libMesh and need to do:
>
> cd build_opt
> make
> make install
> cd ..
> cd build_dbg
> export METHOD=dbg
> make
> make install
>
> Every single change I must now go into two different directories to build
> AND I must run "make install" for each one.
>
Again, I don't see that much of a difference. Yes, cd'ing is a minor
annoyance, but certainly not any kind of measurably time against building
the code and something that is easily added to existing build scripts. And
you still have to make twice with the previous system, so it's not like
there's a big performance difference.
> "make install" BTW is a non-trivial operation. On slow network
> filesystems it can take a significant amount of time.
>
I'm surprised that you get any benefit out of make -j 24 then (vs. -j 12,
say. I'm assuming you're using distcc). Even on a slow file system, I'd be
surprised if make install was a significant percentage of the build time.
> We were trying to debug the PETSc issue we're having with the new build
> system yesterday... and holy smokes it is frustrating to make a tiny change
> then have to wait around while cd'ing to different directories and building
> and make installing. It is FRUSTRATING.
>
Do you have timings or something? I'm not trying to be a jerk, but I find
it hard to believe that your development cycle is suddenly measurably
slower because of having to add a few cd's and make install into your build
cycle.
Paul
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