[petsc-users] TS tutorial ex11 in Fortran
Jed Brown
jed at jedbrown.org
Mon Dec 28 17:16:47 CST 2020
I'd need some form of reproducible test case to debug. It sounds like you're viewing different vectors, but I probably won't be able to track it down without a reproducible test case.
A gdb session might be most helpful to identify which vectors are where when you get the unexpected condition.
Thibault Bridel-Bertomeu <thibault.bridelbertomeu at gmail.com> writes:
> However in Fortran, for the VTK output, it is true I do not view
> ts->vec_sol directly but rather a Vec called sol that I use in the
> TSSolve(ts, sol) call ... but I suppose it should be equivalent shouldn’t
> it ?
>
> Le lun. 28 déc. 2020 à 18:42, Jed Brown <jed at jedbrown.org> a écrit :
>
>> I think I'm not following something. The time stepper implementation
>> (TSStep_XYZ) is where ts->vec_sol should be updated. The controller doesn't
>> have anything to do with it. What TS are you using and how do you know your
>> RHS is nonzero?
>>
>> Thibault Bridel-Bertomeu <thibault.bridelbertomeu at gmail.com> writes:
>>
>> > Hi Jed,
>> >
>> > Thanks for your message.
>> > I implemented everything in C as you suggested and it works fine except
>> for
>> > one thing : the ts->vec_sol does not seem to get updated when seen from
>> the
>> > C code (it is on the Fortran side though the solution is correct).
>> > As a result, the time step (that uses among other things the max velocity
>> > in the domain) is always at the value it gets from the initial solution.
>> > Any idea why ts->vec_sol does not seem to be updated ? (I checked the
>> > stepnum and time is updated though , when accessed with TSGetTime for
>> > instance).
>> >
>> > Cheers,
>> > Thibault
>> >
>> > Le lun. 28 déc. 2020 à 15:30, Jed Brown <jed at jedbrown.org> a écrit :
>> >
>> >> Thibault Bridel-Bertomeu <thibault.bridelbertomeu at gmail.com> writes:
>> >>
>> >> > Good morning everyone,
>> >> >
>> >> > Thank you Barry for the answer, it works now !
>> >> >
>> >> > I am facing (yet) another situation: the TSAdaptRegister function.
>> >> > In the MR on gitlab, Jed mentioned that sometimes, when function
>> pointers
>> >> > are not stored in PETSc objects, one can use stack memory to pass that
>> >> > pointer from fortran to C.
>> >>
>> >> The issue with stack memory is that when it returns, that memory is
>> >> invalid. You can't use it in this instance.
>> >>
>> >> I think you're going to have problems implementing a TSAdaptCreate_XYZ
>> in
>> >> Fortran (because the body of that function will need to access private
>> >> struct members; see below).
>> >>
>> >> I would implement what you need in C and you can call out to Fortran if
>> >> you want from inside TSAdaptChoose_YourMethod().
>> >>
>> >> PETSC_EXTERN PetscErrorCode TSAdaptCreate_DSP(TSAdapt adapt)
>> >> {
>> >> TSAdapt_DSP *dsp;
>> >> PetscErrorCode ierr;
>> >>
>> >> PetscFunctionBegin;
>> >> ierr = PetscNewLog(adapt,&dsp);CHKERRQ(ierr);
>> >> adapt->reject_safety = 1.0; /* unused */
>> >>
>> >> adapt->data = (void*)dsp;
>> >> adapt->ops->choose = TSAdaptChoose_DSP;
>> >> adapt->ops->setfromoptions = TSAdaptSetFromOptions_DSP;
>> >> adapt->ops->destroy = TSAdaptDestroy_DSP;
>> >> adapt->ops->view = TSAdaptView_DSP;
>> >>
>> >> ierr =
>> >>
>> PetscObjectComposeFunction((PetscObject)adapt,"TSAdaptDSPSetFilter_C",TSAdaptDSPSetFilter_DSP);CHKERRQ(ierr);
>> >> ierr =
>> >>
>> PetscObjectComposeFunction((PetscObject)adapt,"TSAdaptDSPSetPID_C",TSAdaptDSPSetPID_DSP);CHKERRQ(ierr);
>> >>
>> >> ierr = TSAdaptDSPSetFilter_DSP(adapt,"PI42");CHKERRQ(ierr);
>> >> ierr = TSAdaptRestart_DSP(adapt);CHKERRQ(ierr);
>> >> PetscFunctionReturn(0);
>> >> }
>> >>
>> >> > Can anyone develop that idea ? Because for TSAdaptRegister, i guess
>> the
>> >> > wrapper would start like :
>> >> >
>> >> > PETSC_EXTERN void tsadaptregister_(char *sname,
>> >> > void
>> >> (*func)(TSAdapt*,PetscErrorCode*),
>> >> > PetscErrorCode *ierr,
>> >> > PETSC_FORTRAN_CHARLEN_T snamelen)
>> >> >
>> >> > but then the C TSAdaptRegister function takes a PetscErrorCode
>> >> > (*func)(TSAdapt) function pointer as argument ... I cannot use any
>> >> > FORTRAN_CALLBACK here since I do not have any object to hook it to,
>> and I
>> >> > could not find a similar situation among the pre-existing wrappers.
>> Does
>> >> > anyone have an idea on how to proceed ?
>> >> >
>> >> > Thanks !!
>> >> >
>> >> > Thibault
>> >> >
>> >> > Le mar. 22 déc. 2020 à 21:20, Barry Smith <bsmith at petsc.dev> a écrit
>> :
>> >> >
>> >> >>
>> >> >> PetscObjectUseFortranCallback((PetscDS)ctx,
>> >> >>
>> >> >>
>> >> >> *ierr = PetscObjectSetFortranCallback((PetscObject)*prob
>> >> >>
>> >> >>
>> >> >> It looks like the problem is that these user provided functions do
>> not
>> >> >> take a PetscDS directly as an argument so the Fortran callback
>> >> information
>> >> >> cannot be obtained from them.
>> >> >>
>> >> >> The manual page for PetscDSAddBoundary() says
>> >> >>
>> >> >> - ctx - An optional user context for bcFunc
>> >> >>
>> >> >> but then when it lists the calling sequence for bcFunc it does not
>> list
>> >> >> the ctx as an argument, so either the manual page or code is wrong.
>> >> >>
>> >> >> It looks like you make the ctx be the PetscDS prob argument when you
>> >> >> call PetscDSAddBoundary
>> >> >>
>> >> >> In principle this sounds like it might work. I think you need to
>> track
>> >> >> through the debugger to see if the ctx passed to ourbocofunc() is
>> >> >> actually the PetscDS prob variable and if not why it is not.
>> >> >>
>> >> >> Barry
>> >> >>
>> >> >>
>> >> >> On Dec 22, 2020, at 5:49 AM, Thibault Bridel-Bertomeu <
>> >> >> thibault.bridelbertomeu at gmail.com> wrote:
>> >> >>
>> >> >> Dear all,
>> >> >>
>> >> >> I have hit two snags while implementing the missing wrappers
>> necessary
>> >> to
>> >> >> transcribe ex11 to Fortran.
>> >> >>
>> >> >> First is about the PetscDSAddBoundary wrapper, that I have done so :
>> >> >>
>> >> >> static PetscErrorCode ourbocofunc(PetscReal time, const PetscReal *c,
>> >> >> const PetscReal *n, const PetscScalar *a_xI, const PetscScalar *a_xG,
>> >> void
>> >> >> *ctx)
>> >> >> {
>> >> >> PetscObjectUseFortranCallback((PetscDS)ctx, bocofunc,
>> >> >> (PetscReal*,const PetscReal*,const
>> >> >> PetscReal*,const PetscScalar*,const
>> PetscScalar*,void*,PetscErrorCode*),
>> >> >> (&time,c,n,a_xI,a_xG,ctx,&ierr));
>> >> >> }
>> >> >> static PetscErrorCode ourbocofunc_time(PetscReal time, const
>> PetscReal
>> >> *c,
>> >> >> const PetscReal *n, const PetscScalar *a_xI, const PetscScalar *a_xG,
>> >> void
>> >> >> *ctx)
>> >> >> {
>> >> >> PetscObjectUseFortranCallback((PetscDS)ctx, bocofunc_time,
>> >> >> (PetscReal*,const PetscReal*,const
>> >> >> PetscReal*,const PetscScalar*,const
>> PetscScalar*,void*,PetscErrorCode*),
>> >> >> (&time,c,n,a_xI,a_xG,ctx,&ierr));
>> >> >> }
>> >> >> PETSC_EXTERN void petscdsaddboundary_(PetscDS *prob,
>> >> >> DMBoundaryConditionType *type, char *name, char *labelname, PetscInt
>> >> >> *field, PetscInt *numcomps, PetscInt *comps,
>> >> >> void (*bcFunc)(void),
>> >> >> void (*bcFunc_t)(void),
>> >> >> PetscInt *numids, const
>> PetscInt
>> >> >> *ids, void *ctx, PetscErrorCode *ierr,
>> >> >> PETSC_FORTRAN_CHARLEN_T
>> namelen,
>> >> >> PETSC_FORTRAN_CHARLEN_T labelnamelen)
>> >> >> {
>> >> >> char *newname, *newlabelname;
>> >> >> FIXCHAR(name, namelen, newname);
>> >> >> FIXCHAR(labelname, labelnamelen, newlabelname);
>> >> >> *ierr = PetscObjectSetFortranCallback((PetscObject)*prob,
>> >> >> PETSC_FORTRAN_CALLBACK_CLASS, &bocofunc,
>> (PetscVoidFunction)bcFunc,
>> >> >> ctx);
>> >> >> *ierr = PetscObjectSetFortranCallback((PetscObject)*prob,
>> >> >> PETSC_FORTRAN_CALLBACK_CLASS, &bocofunc_time,
>> >> (PetscVoidFunction)bcFunc_t,
>> >> >> ctx);
>> >> >> *ierr = PetscDSAddBoundary(*prob, *type, newname, newlabelname,
>> >> >> *field, *numcomps, comps,
>> >> >> (void (*)(void))ourbocofunc,
>> >> >> (void (*)(void))ourbocofunc_time,
>> >> >> *numids, ids, *prob);
>> >> >> FREECHAR(name, newname);
>> >> >> FREECHAR(labelname, newlabelname);
>> >> >> }
>> >> >>
>> >> >>
>> >> >>
>> >> >> but when I call it in the program, with adequate routines, I obtain
>> the
>> >> >> following error :
>> >> >>
>> >> >> [0]PETSC ERROR: --------------------- Error Message
>> >> --------------------------------------------------------------[0]PETSC
>> >> ERROR: Corrupt argument:
>> >> https://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[0]PETSC
>> >> ERROR: Fortran callback not set on this object[0]PETSC ERROR: See
>> >> https://www.mcs.anl.gov/petsc/documentation/faq.html for trouble
>> >> shooting.[0]PETSC ERROR: Petsc Development GIT revision:
>> >> v3.14.2-297-gf36a7edeb8 GIT Date: 2020-12-18 04:42:53 +0000[0]PETSC
>> ERROR:
>> >> ../../../bin/eulerian3D on a named macbook-pro-de-thibault.home by
>> tbridel
>> >> Sun Dec 20 15:05:15 2020[0]PETSC ERROR: Configure options --with-clean=0
>> >> --prefix=/Users/tbridel/Documents/1-CODES/04-PETSC/build
>> --with-make-np=2
>> >> --with-windows-graphics=0 --with-debugging=0 --download-fblaslapack
>> >> --download-mpich-shared=0 --with-x=0 --with-pthread=0 --with-valgrind=0
>> >> --PETSC_ARCH=macosx
>> >> --with-fc=/usr/local/Cellar/open-mpi/4.0.1_2/bin/mpifort
>> >> --with-cc=/usr/local/Cellar/open-mpi/4.0.1_2/bin/mpicc
>> >> --with-cxx=/usr/local/Cellar/open-mpi/4.0.1_2/bin/mpic++ --with-openmp=0
>> >> --download-hypre=yes --download-sowing=yes --download-metis=yes
>> >> --download-parmetis=yes --download-triangle=yes --download-tetgen=yes
>> >> --download-ctetgen=yes --download-p4est=yes --download-zlib=yes
>> >> --download-c2html=yes --download-eigen=yes --download-pragmatic=yes
>> >> --with-hdf5-dir=/usr/local/Cellar/hdf5/1.10.5_1
>> >> --with-cmake-dir=/usr/local/Cellar/cmake/3.15.3[0]PETSC ERROR: #1
>> >> PetscObjectGetFortranCallback() line 258 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/sys/objects/inherit.c[0]PETSC
>> >> ERROR: #2 ourbocofunc() line 141 in
>> >>
>> /Users/tbridel/Documents/1-CODES/59-EULERIAN3D/sources/petsc_wrapping/wrapper_petsc.c[0]PETSC
>> >> ERROR: #3 DMPlexInsertBoundaryValuesRiemann() line 989 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/dm/impls/plex/plexfem.c[0]PETSC
>> >> ERROR: #4 DMPlexInsertBoundaryValues_Plex() line 1052 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/dm/impls/plex/plexfem.c[0]PETSC
>> >> ERROR: #5 DMPlexInsertBoundaryValues() line 1142 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/dm/impls/plex/plexfem.c[0]PETSC
>> >> ERROR: #6 DMPlexComputeResidual_Internal() line 4524 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/dm/impls/plex/plexfem.c[0]PETSC
>> >> ERROR: #7 DMPlexTSComputeRHSFunctionFVM() line 74 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/utils/dmplexts.c[0]PETSC
>> >> ERROR: #8 ourdmtsrhsfunc() line 186 in
>> >>
>> /Users/tbridel/Documents/1-CODES/59-EULERIAN3D/sources/petsc_wrapping/wrapper_petsc.c[0]PETSC
>> >> ERROR: #9 TSComputeRHSFunction_DMLocal() line 105 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/utils/dmlocalts.c[0]PETSC
>> >> ERROR: #10 TSComputeRHSFunction() line 653 in
>> >> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/interface/ts.c[0]PETSC
>> >> ERROR: #11 TSSSPStep_RK_3() line 120 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/impls/explicit/ssp/ssp.c[0]PETSC
>> >> ERROR: #12 TSStep_SSP() line 208 in
>> >>
>> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/impls/explicit/ssp/ssp.c[0]PETSC
>> >> ERROR: #13 TSStep() line 3757 in
>> >> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/interface/ts.c[0]PETSC
>> >> ERROR: #14 TSSolve() line 4154 in
>> >> /Users/tbridel/Documents/1-CODES/04-PETSC/src/ts/interface/ts.c[0]PETSC
>> >> ERROR: #15 User provided function() line 0 in User file
>> >> >>
>> >> >>
>> >> >> Second is about the DMProjectFunction wrapper, that I have done so :
>> >> >>
>> >> >> static PetscErrorCode ourdmprojfunc(PetscInt dim, PetscReal time,
>> >> >> PetscReal x[], PetscInt Nf, PetscScalar u[], void *ctx)
>> >> >> {
>> >> >> PetscObjectUseFortranCallback((DM)ctx, dmprojfunc,
>> >> >>
>> >> >>
>> >>
>> (PetscInt*,PetscReal*,PetscReal*,PetscInt*,PetscScalar*,void*,PetscErrorCode*),
>> >> >> (&dim,&time,x,&Nf,u,_ctx,&ierr))
>> >> >> }
>> >> >> PETSC_EXTERN void dmprojectfunction_(DM *dm, PetscReal *time,
>> >> >> void
>> >> >>
>> >>
>> (*func)(PetscInt*,PetscReal*,PetscReal*,PetscInt*,PetscScalar*,void*,PetscErrorCode*),
>> >> >> void *ctx, InsertMode *mode,
>> Vec X,
>> >> >> PetscErrorCode *ierr)
>> >> >> {
>> >> >> PetscErrorCode (*funcarr[1]) (PetscInt dim, PetscReal time,
>> >> PetscReal
>> >> >> x[], PetscInt Nf, PetscScalar *u, void *ctx);
>> >> >> *ierr = PetscObjectSetFortranCallback((PetscObject)*dm,
>> >> >> PETSC_FORTRAN_CALLBACK_CLASS, &dmprojfunc, (PetscVoidFunction)func,
>> >> ctx);
>> >> >> funcarr[0] = ourdmprojfunc;
>> >> >> *ierr = DMProjectFunction(*dm, *time, funcarr, &ctx, *mode, X);
>> >> >> }
>> >> >>
>> >> >>
>> >> >> This time there is no error because I cannot reach this point in the
>> >> >> program, but I am not sure anyways how to write this wrapper,
>> especially
>> >> >> because of the double pointers that DMProjectFunction takes as
>> >> arguments.
>> >> >>
>> >> >> Does anyone have any idea what could be going wrong with those two
>> >> >> wrappers ?
>> >> >>
>> >> >> Thank you very much in advance !!
>> >> >>
>> >> >> Thibault
>> >> >>
>> >> >> Le ven. 18 déc. 2020 à 11:02, Thibault Bridel-Bertomeu <
>> >> >> thibault.bridelbertomeu at gmail.com> a écrit :
>> >> >>
>> >> >>> Aah that is a nice trick, I was getting ready to fork, clone the
>> fork
>> >> and
>> >> >>> redo the work, but that worked fine ! Thank you Barry !
>> >> >>>
>> >> >>> The MR will appear in a little while !
>> >> >>>
>> >> >>> Thibault
>> >> >>>
>> >> >>>
>> >> >>> Le ven. 18 déc. 2020 à 10:16, Barry Smith <bsmith at petsc.dev> a
>> écrit :
>> >> >>>
>> >> >>>>
>> >> >>>> Good question. There is a trick to limit the amount of work you
>> >> need
>> >> >>>> to do with a new fork after you have already made changes with a
>> >> PETSc
>> >> >>>> clone, but it looks like we do not document this clearly in the
>> >> webpages.
>> >> >>>> (I couldn't find it).
>> >> >>>>
>> >> >>>> Yes, you do need to make a fork, but after you have made the
>> fork on
>> >> >>>> the GitLab website (and have done nothing on your machine) edit the
>> >> file
>> >> >>>> $PETSC_DIR/.git/config for your clone on your machine
>> >> >>>>
>> >> >>>> Locate the line that has url = git at gitlab.com:petsc/petsc.git
>> >> (this
>> >> >>>> may have an https at the beginning of the line)
>> >> >>>>
>> >> >>>> Change this line to point to the fork url instead with git@ not
>> >> >>>> https, which will be pretty much the same URL but with your user id
>> >> instead
>> >> >>>> of petsc in the address. Then git push and it will push to your
>> fork.
>> >> >>>>
>> >> >>>> Now you changes will be in your fork and you can make the MR from
>> >> your
>> >> >>>> fork URL on Gitlab. (In other words this editing trick converts
>> your
>> >> PETSc
>> >> >>>> clone on your machine to a PETSc fork).
>> >> >>>>
>> >> >>>> I hope I have explained this clearly enough it goes smoothly.
>> >> >>>>
>> >> >>>> Barry
>> >> >>>>
>> >> >>>>
>> >> >>>>
>> >> >>>> On Dec 18, 2020, at 3:00 AM, Thibault Bridel-Bertomeu <
>> >> >>>> thibault.bridelbertomeu at gmail.com> wrote:
>> >> >>>>
>> >> >>>> Hello Barry,
>> >> >>>>
>> >> >>>> I'll start the MR as soon as possible then so that specialists can
>> >> >>>> indeed have a look. Do I have to fork PETSc to start a MR or are
>> >> PETSc repo
>> >> >>>> settings such that can I push a branch from the PETSc clone I got ?
>> >> >>>>
>> >> >>>> Thibault
>> >> >>>>
>> >> >>>>
>> >> >>>> Le mer. 16 déc. 2020 à 07:47, Barry Smith <bsmith at petsc.dev> a
>> écrit
>> >> :
>> >> >>>>
>> >> >>>>>
>> >> >>>>> Thibault,
>> >> >>>>>
>> >> >>>>> A subdirectory for the example is fine; we have other examples
>> that
>> >> >>>>> use subdirectories and multiple files.
>> >> >>>>>
>> >> >>>>> Note: even if you don't have something completely working you
>> can
>> >> >>>>> still make MR and list it as DRAFT request for comments, some
>> other
>> >> PETSc
>> >> >>>>> members who understand the packages you are using and Fortran
>> better
>> >> than I
>> >> >>>>> may be able to help as you develop the code.
>> >> >>>>>
>> >> >>>>> Barry
>> >> >>>>>
>> >> >>>>>
>> >> >>>>>
>> >> >>>>>
>> >> >>>>> On Dec 16, 2020, at 12:35 AM, Thibault Bridel-Bertomeu <
>> >> >>>>> thibault.bridelbertomeu at gmail.com> wrote:
>> >> >>>>>
>> >> >>>>> Hello everyone,
>> >> >>>>>
>> >> >>>>> Thank you Barry for the feedback.
>> >> >>>>> OK, yes I'll work up an MR as soon as I have got something
>> working.
>> >> By
>> >> >>>>> the way, does the fortran-version of the example have to be a
>> single
>> >> file ?
>> >> >>>>> If my push contains a directory with several files (different
>> >> modules and
>> >> >>>>> the main), and the Makefile that goes with it, is that ok ?
>> >> >>>>>
>> >> >>>>> Thibault Bridel-Bertomeu
>> >> >>>>>
>> >> >>>>>
>> >> >>>>> Le mer. 16 déc. 2020 à 04:46, Barry Smith <bsmith at petsc.dev> a
>> >> écrit :
>> >> >>>>>
>> >> >>>>>>
>> >> >>>>>> This is great. If you make a branch off of the PETSc git
>> >> repository
>> >> >>>>>> with these additions and work on ex11 you can make a merge
>> request
>> >> and we
>> >> >>>>>> can run the code easily on all our test systems (for security
>> >> reasons one
>> >> >>>>>> of use needs to launch the tests from your MR).
>> >> >>>>>> https://docs.petsc.org/en/latest/developers/integration/
>> >> >>>>>>
>> >> >>>>>> Barry
>> >> >>>>>>
>> >> >>>>>>
>> >> >>>>>> On Dec 15, 2020, at 5:35 AM, Thibault Bridel-Bertomeu <
>> >> >>>>>> thibault.bridelbertomeu at gmail.com> wrote:
>> >> >>>>>>
>> >> >>>>>> Hello everyone,
>> >> >>>>>>
>> >> >>>>>> So far, I have the wrappers in the files attached to this
>> e-mail. I
>> >> >>>>>> still do not know if they work properly - at least the code
>> >> compiles and
>> >> >>>>>> the calls to the wrapped-subroutine do not fail - but I wanted to
>> >> put this
>> >> >>>>>> here in case someone sees something really wrong with it already.
>> >> >>>>>>
>> >> >>>>>> Thank you again for your help, I'll try to post updates of the
>> F90
>> >> >>>>>> version of ex11 regularly in this thread.
>> >> >>>>>>
>> >> >>>>>> Stay safe,
>> >> >>>>>>
>> >> >>>>>> Thibault Bridel-Bertomeu
>> >> >>>>>>
>> >> >>>>>> Le dim. 13 déc. 2020 à 16:39, Jed Brown <jed at jedbrown.org> a
>> écrit
>> >> :
>> >> >>>>>>
>> >> >>>>>>> Thibault Bridel-Bertomeu <thibault.bridelbertomeu at gmail.com>
>> >> writes:
>> >> >>>>>>>
>> >> >>>>>>> > Thank you Mark for your answer.
>> >> >>>>>>> >
>> >> >>>>>>> > I am not sure what you think could be in the setBC1 routine ?
>> How
>> >> >>>>>>> to make
>> >> >>>>>>> > the connection with the PetscDS ?
>> >> >>>>>>> >
>> >> >>>>>>> > On the other hand, I actually found after a while TSMonitorSet
>> >> has a
>> >> >>>>>>> > fortran wrapper, and it does take as arguments two function
>> >> >>>>>>> pointers, so I
>> >> >>>>>>> > guess it is possible ? Although I am not sure exactly how to
>> play
>> >> >>>>>>> with the
>> >> >>>>>>> > PetscObjectSetFortranCallback & PetscObjectUseFortranCallback
>> >> >>>>>>> macros -
>> >> >>>>>>> > could anybody advise please ?
>> >> >>>>>>>
>> >> >>>>>>> tsmonitorset_ is a good example to follow. In your file, create
>> one
>> >> >>>>>>> of these static structs with a member for each callback. These
>> are
>> >> IDs that
>> >> >>>>>>> will be used as keys for Fortran callbacks and their contexts.
>> The
>> >> salient
>> >> >>>>>>> parts of the file are below.
>> >> >>>>>>>
>> >> >>>>>>> static struct {
>> >> >>>>>>> PetscFortranCallbackId prestep;
>> >> >>>>>>> PetscFortranCallbackId poststep;
>> >> >>>>>>> PetscFortranCallbackId rhsfunction;
>> >> >>>>>>> PetscFortranCallbackId rhsjacobian;
>> >> >>>>>>> PetscFortranCallbackId ifunction;
>> >> >>>>>>> PetscFortranCallbackId ijacobian;
>> >> >>>>>>> PetscFortranCallbackId monitor;
>> >> >>>>>>> PetscFortranCallbackId mondestroy;
>> >> >>>>>>> PetscFortranCallbackId transform;
>> >> >>>>>>> #if defined(PETSC_HAVE_F90_2PTR_ARG)
>> >> >>>>>>> PetscFortranCallbackId function_pgiptr;
>> >> >>>>>>> #endif
>> >> >>>>>>> } _cb;
>> >> >>>>>>>
>> >> >>>>>>> /*
>> >> >>>>>>> Note ctx is the same as ts so we need to get the Fortran
>> context
>> >> >>>>>>> out of the TS; this gets put in _ctx using the callback ID
>> >> >>>>>>> */
>> >> >>>>>>> static PetscErrorCode ourmonitor(TS ts,PetscInt i,PetscReal
>> d,Vec
>> >> >>>>>>> v,void *ctx)
>> >> >>>>>>> {
>> >> >>>>>>>
>> >> >>>>>>>
>> >>
>> PetscObjectUseFortranCallback(ts,_cb.monitor,(TS*,PetscInt*,PetscReal*,Vec
>> >> >>>>>>> *,void*,PetscErrorCode*),(&ts,&i,&d,&v,_ctx,&ierr));
>> >> >>>>>>> }
>> >> >>>>>>>
>> >> >>>>>>> Then follow as in tsmonitorset_, which sets two callbacks.
>> >> >>>>>>>
>> >> >>>>>>> PETSC_EXTERN void tsmonitorset_(TS *ts,void
>> >> >>>>>>>
>> (*func)(TS*,PetscInt*,PetscReal*,Vec*,void*,PetscErrorCode*),void
>> >> >>>>>>> *mctx,void (*d)(void*,PetscErrorCode*),PetscErrorCode *ierr)
>> >> >>>>>>> {
>> >> >>>>>>> CHKFORTRANNULLFUNCTION(d);
>> >> >>>>>>> if ((PetscVoidFunction)func == (PetscVoidFunction)
>> >> >>>>>>> tsmonitordefault_) {
>> >> >>>>>>> *ierr = TSMonitorSet(*ts,(PetscErrorCode
>> >> >>>>>>>
>> >>
>> (*)(TS,PetscInt,PetscReal,Vec,void*))TSMonitorDefault,*(PetscViewerAndFormat**)mctx,(PetscErrorCode
>> >> >>>>>>> (*)(void **))PetscViewerAndFormatDestroy);
>> >> >>>>>>> } else {
>> >> >>>>>>> *ierr =
>> >> >>>>>>>
>> >>
>> PetscObjectSetFortranCallback((PetscObject)*ts,PETSC_FORTRAN_CALLBACK_CLASS,&_cb.monitor,(PetscVoidFunction)func,mctx);
>> >> >>>>>>> *ierr =
>> >> >>>>>>>
>> >>
>> PetscObjectSetFortranCallback((PetscObject)*ts,PETSC_FORTRAN_CALLBACK_CLASS,&_cb.mondestroy,(PetscVoidFunction)d,mctx);
>> >> >>>>>>> *ierr = TSMonitorSet(*ts,ourmonitor,*ts,ourmonitordestroy);
>> >> >>>>>>> }
>> >> >>>>>>> }
>> >> >>>>>>>
>> >> >>>>>> <wrapper_petsc.h90><wrapper_petsc.c>
>> >> >>>>>>
>> >> >>>>>>
>> >> >>>>>>
>> >> >>>>>
>> >> >>>>
>> >> >>
>> >>
>> > --
>> > Thibault Bridel-Bertomeu
>> > —
>> > Eng, MSc, PhD
>> > Research Engineer
>> > CEA/CESTA
>> > 33114 LE BARP
>> > Tel.: (+33)557046924
>> > Mob.: (+33)611025322
>> > Mail: thibault.bridelbertomeu at gmail.com
>>
> --
> Thibault Bridel-Bertomeu
> —
> Eng, MSc, PhD
> Research Engineer
> CEA/CESTA
> 33114 LE BARP
> Tel.: (+33)557046924
> Mob.: (+33)611025322
> Mail: thibault.bridelbertomeu at gmail.com
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