[petsc-users] Optimized Option

[Matthew Knepley]

On Fri, Jun 3, 2011 at 3:50 PM, <zhenglun.wei at gmail.com> wrote:

> Thanks Matt,
> I think I got it. Does that mean I need to configure a PETSC_ARCH as
> --with-debugging=0 so that I can used it later on.
>

Yes, and build it.

  Matt


> best,
> Alan
>
>
> On , Matthew Knepley <knepley at gmail.com> wrote:
> > On Fri, Jun 3, 2011 at 3:38 PM, Barry Smith bsmith at mcs.anl.gov> wrote:
> >
> >
> >
> > On Jun 3, 2011, at 3:30 PM, Matthew Knepley wrote:
> >
> >
> >
> > > On Fri, Jun 3, 2011 at 3:28 PM, zhenglun.wei at gmail.com> wrote:
> >
> > > Thanks for your reply.
> >
> > > So, if I want to use '--with-debugging=0', what is the PETSC_ARCH equal
> to?
> >
> > >
> >
> > > When you run configure, at the end it prints out a LARGE message that
> indicates
> >
> > >
> >
> > >   - What PETSC_ARCH it has chosen
> >
> > >
> >
> > >   - Exactly the command line to run when building
> >
> > >
> >
> > > This information is also stored in configure.log
> >
> >
> >
> >
> >   You should provide a value for the environmental variable PETSC_ARCH
> before running ./configure
> >
> >
> >
> >   For example   PETSC_ARCH=arch-debug    ./configure --with-debugging=1
> otherstuff
> >
> >   then PETSC_ARCH=arch-opt    ./configure --with-debugging=0   otherstuff
> >
> > This is fragile since it depends on your shell. Just use
> >
> >
> >   ./configure --with-debugging=0 --PETSC_ARCH=arch-opt
> >
> >
> >
> >    Matt
> >
> >
> > >
> >
> > >     Matt
> >
> > >
> >
> > > I just tried to use PETSC = arch-opt, and a error message comes up:
> >
> > > ~/petsc-dev/conf/variables:95:
> ~/petsc-dev/arch-opt/conf/petscvariables: No such file or directory
> >
> > > ~l/petsc-dev/conf/rules:1018: ~/petsc-dev/arch-opt/conf/petscrules: No
> such file or directory
> >
> > > make: *** No rule to make target
> `~l/petsc-dev/arch-opt/conf/petscrules'. Stop.
> >
> > > this really confused me.
> >
> > >
> >
> > > thanks,
> >
> > > Alan
> >
> > >
> >
> > > On , Barry Smith bsmith at mcs.anl.gov> wrote:
> >
> > > >
> >
> > > >
> >
> > > > On Jun 3, 2011, at 2:57 PM, Alan Wei wrote:
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > > > Dear Sir/Madam,
> >
> > > >
> >
> > > > >     Lately, I read there is a optimized version of PETSc by using
> '--with-debugging=0'. I have two questions here:
> >
> > > >
> >
> > > > > 1, Do I need to use '/config/configure.py ... --with-debugging=0'
> when I configure the PETSc in order to use the non-debugging version of
> PETSc? Therefore, if I want to switch PETSc between these two versions, I
> have to keep configuring.
> >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >   ABSOLUTELY NOT.  You use two different values of the environmental
> variable PETSC_ARCH and switch back and forth by changing the variable. You
> can even change it on the make command line. For example make mycode
> PETSC_ARCH=arch-opt
> >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >   Note that you can use any name you want for the values of
> PETSC_ARCH. I often use arch-debug and arch-opt to keep track of them.
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > > > 2, I was using the '--with-debugging=0' to configure the PETSc.
> However, I tested the computational rate by executing the ex29.c. The
> non-debugging version does not improve the speed much; in the contrary, it
> slow down the speed a little bit. The comparison is attached here. Any idea
> on this.
> >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >    It depends on the compiler and particular code you are running. We
> recommend using the option -log_summary to see how much time is spent in
> each part of the computation and how much it gets better with optimization.
> >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >   Barry
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > >
> >
> > > > >
> >
> > > >
> >
> > > > > thanks in advance,
> >
> > > >
> >
> > > > > Alan
> >
> > > >
> >
> > > > >
> >
> > > >
> >
> > > > >
> >
> > > >
> >
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> >
> > > >
> >
> > > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > --
> >
> > > What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> >
> > > -- Norbert Wiener
> >
> >
> >
> >
> >
> >
> >
> >
> > --
> > What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> >
> > -- Norbert Wiener
> >
> >
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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