[petsc-users] memory scalable AO

[Barry Smith]

  Ahh, yes. This is our fault. Because this function takes a string it needs a custom Fortran stub which it does not have. We'll get you a patch soon.

   Barry

> On Feb 17, 2016, at 3:46 PM, Randall Mackie <rlmackie862 at gmail.com> wrote:
> 
> The attached test program demonstrates the problem. When I run it, I get the following output:
> 
> [0]PETSC ERROR: ------------------------------------------------------------------------
> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range
> [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
> [0]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/documentation/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] PetscStrlen line 150 /home/rmackie/PETSc/petsc-3.6.3/src/sys/utils/str.c
> [0]PETSC ERROR: [0] PetscStrallocpy line 185 /home/rmackie/PETSc/petsc-3.6.3/src/sys/utils/str.c
> [0]PETSC ERROR: [0] DMDASetAOType line 84 /home/rmackie/PETSc/petsc-3.6.3/src/dm/impls/da/daindex.c
> [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> [0]PETSC ERROR: Signal received
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> 
> 
> Randy
> 
> 
>> On Feb 17, 2016, at 11:35 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>> 
>> 
>> Should be ok. Do you have implicit none and the correct include files so AOMEMORYSCALABLE is defined?
>> 
>> I think you need to run in the debugger next to track why this happens.
>> 
>>  Barry
>> 
>>> On Feb 17, 2016, at 11:33 AM, Randall Mackie <rlmackie862 at gmail.com> wrote:
>>> 
>>> What is the correct way to set the AO for a DMDA to be the memory scalable version?
>>> 
>>> I have tried this:
>>> 
>>> call DMDASetAOType(da,AOMEMORYSCALABLE,ierr)
>>> call DMDAGetAO(da,ao,ierr)
>>> 
>>> The code compiles fine, but I simply get a Segmentation Violation when I run it:
>>> 
>>> [3]PETSC ERROR: ------------------------------------------------------------------------
>>> [3]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range
>>> [3]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
>>> [3]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
>>> [3]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors
>>> [3]PETSC ERROR: configure using --with-debugging=yes, recompile, link, and run 
>>> [3]PETSC ERROR: to get more information on the crash.
>>> [3]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
>>> [3]PETSC ERROR: Signal received
>>> [3]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
>>> [3]PETSC ERROR: Petsc Release Version 3.6.3, Dec, 03, 2015 
>>> [3]PETSC ERROR: Configure options PETSC_ARCH=linux-gfortran-opt --with-clean=1 --with-scalar-type=complex --with-debugging=0 --with-fortran=1 --download-mpich=./mpich-3.1.3.tar.gz --FOPTFLAGS=-O3 --COPTFLAGS=-O3
>>> [3]PETSC ERROR: #1 User provided function() line 0 in  unknown file
>>> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 3
>>> [cli_3]: aborting job:
>>> 
>>> 
>>> In fact, I get the same thing even if I set the AOType to AOBASIC, in other words
>>> 
>>> call DMDASetAOTYPE(da,AOBASIC,ierr)
>>> 
>>> 
>>> Previously, I did not set an AOType, and only called DMDAGetAO, which works fine, and from what I can tell sets the type to basic.
>>> 
>>> 
>>> Thanks, Randy M.
>> 
> <test.F90><makefile>