[petsc-users] Fwd: nondeterministic behavior with ./program -help | head

Wed Apr 26 17:34:04 CDT 2017

[Missed reply all.]

---------- Forwarded message ----------
From: Ed Bueler <elbueler at alaska.edu>
Date: Wed, Apr 26, 2017 at 2:33 PM
Subject: Re: [petsc-users] nondeterministic behavior with ./program -help |
head
To: Barry Smith <bsmith at mcs.anl.gov>

Yes, I thought of something vaguely like that.  How about

./program -help_string

or -help_only?

Ed

On Wed, Apr 26, 2017 at 2:28 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   Ed
>
>    I think want you want is something like
>
>    ./program -intro
>
> that causes the help message to PetscInitialize() to be printed and then
> have the program end.
>
> We can add this, -intro is not a great name, any idea for a better name?
>
>   Barry
>
> > On Apr 26, 2017, at 4:30 PM, Ed Bueler <elbueler at alaska.edu> wrote:
> >
> > > Is  ./ex5 -help -no_signal_handler  | head  good enough?
> >
> > Umm.  It eliminates the nondeterminism.  Should discovery of options for
> petsc user applications go via error messages?  (Or asking users to
> remember "-no_signal_handler" to avoid?)  I don't understand signal
> handling well-enough to recommend a better way ... maybe there is no better
> way for |head.
> >
> > The best alternative I can think of is if my codes supply the program
> name for the "const char man[]" argument of PetscOptionsXXX().  Then I can
> suggest this to users:
> >
> > ./program -help |grep program
> >
> > Is this a mis-use of the "man" argument?
> >
> > Ed
> >
> > PS  Amused to find "This routine should not be used from within a signal
> handler." in the man page for MPI_Abort(), which I reached by clicking on
> the call to MPI_Abort() in the view of PetscSignalHandlerDefault().  ;-)
> >
> >
> > On Wed, Apr 26, 2017 at 12:55 PM, Barry Smith <bsmith at mcs.anl.gov>
> wrote:
> >
> > Is
> >
> > ./ex5 -help -no_signal_handler  | head
> >
> > good enough?
> >
> > Normally we won't want to turn off catching of PIPE errors  since it
> might hide other errors.
> >
> > Barry
> >
> >
> >
> > > On Apr 26, 2017, at 3:31 PM, Ed Bueler <elbueler at alaska.edu> wrote:
> > >
> > > Dear Petsc --
> > >
> > > Copied at the bottom is the behavior I get for ex5.c in snes
> examples/tutorials.  When I do
> > >
> > > $./ex5 -help |head
> > >
> > > I get a "Caught signal number 13 Broken Pipe" or just a version
> string.  Randomly, one or the other.
> > >
> > > I know this has come up on petsc-users before:
> > >     http://lists.mcs.anl.gov/pipermail/petsc-users/2014-May/
> 021848.html
> > > The claim was that the SIGPIPE error is standard behavior.
> > >
> > > My real issue (feature request?) is that when writing a petsc
> application I want a rational help system.  Suppose "program.c" has options
> with prefix "prg_".  The user doesn't know the prefix yet (I could have
> used "prog_" as the prefix ...)  The petsc-canonical help system is (I
> believe)
> > >
> > > ./program -help |grep prg_
> > >
> > > for program.c-specific options.  Works great if you know to look for
> "prg_".  My plan for my applications is to put the prefix in the first line
> or two of my help string, the user can discover the prefix by
> > >
> > > ./program -help |head
> > >
> > > and then use "-help |grep -prg_" and etc.
> > >
> > > So my question is:  Can petsc be set up to not generate an error
> message when the help system is used in a correct way?  (I.e. catching
> return codes when writing, or handling SIGPIPE differently?)  Or, on the
> other hand, can someone suggest a better help system that irritates less?
> > >
> > > Thanks!
> > >
> > > Ed
> > >
> > > ~/petsc/src/snes/examples/tutorials[master*]$ ./ex5 -help |head
> > > Bratu nonlinear PDE in 2d.
> > > We solve the  Bratu (SFI - solid fuel ignition) problem in a 2D
> rectangular
> > > domain, using distributed arrays (DMDAs) to partition the parallel
> grid.
> > > The command line options include:
> > >   -par <parameter>, where <parameter> indicates the problem's
> nonlinearity
> > >      problem SFI:  <parameter> = Bratu parameter (0 <= par <= 6.81)
> > >
> > >   -m_par/n_par <parameter>, where <parameter> indicates an integer
> > >        that MMS3 will be evaluated with 2^m_par,
> 2^n_par-----------------------------------------------------
> ---------------------
> > > Petsc Development GIT revision: v3.7.6-3453-ge45481d470  GIT Date:
> 2017-04-26 13:00:15 -0500
> > > [0]PETSC ERROR: ------------------------------
> ------------------------------------------
> > > [0]PETSC ERROR: Caught signal number 13 Broken Pipe: Likely while
> reading or writing to a socket
> > > [0]PETSC ERROR: Try option -start_in_debugger or
> -on_error_attach_debugger
> > > [0]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/d
> ocumentation/faq.html#valgrind
> > > [0]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac
> OS X to find memory corruption errors
> > > [0]PETSC ERROR: likely location of problem given in stack below
> > > [0]PETSC ERROR: ---------------------  Stack Frames
> ------------------------------------
> > > [0]PETSC ERROR: Note: The EXACT line numbers in the stack are not
> available,
> > > [0]PETSC ERROR:       INSTEAD the line number of the start of the
> function
> > > [0]PETSC ERROR:       is given.
> > > [0]PETSC ERROR: [0] PetscVFPrintfDefault line 240
> /home/ed/petsc/src/sys/fileio/mprint.c
> > > [0]PETSC ERROR: [0] PetscHelpPrintfDefault line 622
> /home/ed/petsc/src/sys/fileio/mprint.c
> > > [0]PETSC ERROR: [0] PetscOptionsBegin_Private line 29
> /home/ed/petsc/src/sys/objects/aoptions.c
> > > [0]PETSC ERROR: [0] PetscObjectOptionsBegin_Private line 61
> /home/ed/petsc/src/sys/objects/aoptions.c
> > > [0]PETSC ERROR: [0] PetscDSSetFromOptions line 218
> /home/ed/petsc/src/dm/dt/interface/dtds.c
> > > [0]PETSC ERROR: [0] DMSetFromOptions line 747
> /home/ed/petsc/src/dm/interface/dm.c
> > > [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> > > [0]PETSC ERROR: Signal received
> > > [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/d
> ocumentation/faq.html for trouble shooting.
> > > [0]PETSC ERROR: Petsc Development GIT revision:
> v3.7.6-3453-ge45481d470  GIT Date: 2017-04-26 13:00:15 -0500
> > > [0]PETSC ERROR: ./ex5 on a linux-c-dbg named bueler-leopard by ed Wed
> Apr 26 11:22:07 2017
> > > [0]PETSC ERROR: Configure options --download-mpich --with-debugging=1
> > > [0]PETSC ERROR: #1 User provided function() line 0 in  unknown file
> > > application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
> > > [unset]: aborting job:
> > > application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
> > > ~/petsc/src/snes/examples/tutorials[master*]$ ./ex5 -help |head
> > > Bratu nonlinear PDE in 2d.
> > > We solve the  Bratu (SFI - solid fuel ignition) problem in a 2D
> rectangular
> > > domain, using distributed arrays (DMDAs) to partition the parallel
> grid.
> > > The command line options include:
> > >   -par <parameter>, where <parameter> indicates the problem's
> nonlinearity
> > >      problem SFI:  <parameter> = Bratu parameter (0 <= par <= 6.81)
> > >
> > >   -m_par/n_par <parameter>, where <parameter> indicates an integer
> > >        that MMS3 will be evaluated with 2^m_par,
> 2^n_par-----------------------------------------------------
> ---------------------
> > > Petsc Development GIT revision: v3.7.6-3453-ge45481d470  GIT Date:
> 2017-04-26 13:00:15 -0500
> > > ~/petsc/src/snes/examples/tutorials[master*]$
> > >
> > >
> > > --
> > > Ed Bueler
> > > Dept of Math and Stat and Geophysical Institute
> > > University of Alaska Fairbanks
> > > Fairbanks, AK 99775-6660
> > > 301C Chapman
> >
> >
> >
> >
> > --
> > Ed Bueler
> > Dept of Math and Stat and Geophysical Institute
> > University of Alaska Fairbanks
> > Fairbanks, AK 99775-6660
> > 301C Chapman
>
>

-- 
Ed Bueler
Dept of Math and Stat and Geophysical Institute
University of Alaska Fairbanks
Fairbanks, AK 99775-6660
301C Chapman

-- 
Ed Bueler
Dept of Math and Stat and Geophysical Institute
University of Alaska Fairbanks
Fairbanks, AK 99775-6660
301C Chapman
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20170426/95fdc9e0/attachment-0001.html>