[CIG-SHORT] Rate and State and Initial Traction
Romain Jolivet
rjolivet at caltech.edu
Thu Aug 30 14:29:53 PDT 2012
My relative tolerance is now 1e-20, and ksp_atol = 1e-12.
zero_tolerance = 1e-10 , by default.
PETSc says ksp converges due to atol (no funny stuff due to machine epsilon, then), and the ksp residual norm is 3 orders of magnitude smaller than zero_tolerance, but still the same crash.
What worries me is that the exact same problem with SlipWeakening instead of RateStateAgeing runs fine, and converges quite fast.
227 KSP Residual norm 6.958904427869e-12
228 KSP Residual norm 6.691327759355e-12
229 KSP Residual norm 6.133784618340e-12
230 KSP Residual norm 5.231708553237e-12
231 KSP Residual norm 3.601477632037e-12
232 KSP Residual norm 2.240651195747e-12
233 KSP Residual norm 1.382256145050e-12
234 KSP Residual norm 1.051621131548e-12
235 KSP Residual norm 9.795463232997e-13
Linear solve converged due to CONVERGED_ATOL iterations 235
[0]PETSC ERROR: --------------------- Error Message ------------------------------------
[0]PETSC ERROR: Floating point exception!
[0]PETSC ERROR: Infinite or not-a-number generated in norm!
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Development HG revision: 3bede28f1195e406d4257c9fbeebefe827793801 HG Date: Mon Jun 11 22:14:12 2012 -0400
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/mpinemesis on a pylith-da named dhcp-74-229.caltech.edu by jolivetinsar Thu Aug 30 14:22:49 2012
[0]PETSC ERROR: Libraries linked from /Users/buildbot/install/pylith_darwin_10.6_binbot/lib
[0]PETSC ERROR: Configure run at Tue Jun 12 06:09:00 2012
[0]PETSC ERROR: Configure options --prefix=/Users/buildbot/install/pylith_darwin_10.6_binbot --download-f-blas-lapack=1 --with-sieve=1 --with-c2html=0 --CXXFLAGS=-DMPICH_IGNORE_CXX_SEEK --with-clanguage=C++ --with-mpicompilers=1 --with-debugging=0 --download-chaco=1 --download-boost=1 --download-ml=1 --with-hdf5=1 --with-hdf5-dir=/Users/buildbot/install/pylith_darwin_10.6_binbot --with-x=0 --with-shared-libraries=1
[0]Fatal error. Calling MPI_Abort() to abort PyLith application.
PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: VecNorm() line 169 in src/vec/vec/interface/rvector.c
[0]PETSC ERROR: VecNormalize() line 263 in src/vec/vec/interface/rvector.c
[0]PETSC ERROR: KSPGMRESCycle() line 127 in src/ksp/ksp/impls/gmres/gmres.c
[0]PETSC ERROR: KSPSolve_GMRES() line 231 in src/ksp/ksp/impls/gmres/gmres.c
[0]PETSC ERROR: KSPSolve() line 446 in src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: _sensitivitySolve() line 2172 in "unknowndirectory/"faults/FaultCohesiveDyn.cc
Traceback (most recent call last):
File "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/apps/PetscApplication.py", line 65, in onComputeNodes
self.main(*args, **kwds)
File "/Users/jolivetinsar/MYBIN/pylith/pylith-1/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis: mpirun: exit 255
/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/pylith: /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis: exit 1
Romain Jolivet
Postdoctoral Scholar
Geological and Planetary Sciences
California Institute of Technology, Pasadena, CA
rjolivet at caltech.edu
+1 (626) 560 6356
On Aug 30, 2012, at 2:19 PM, cig-short-request at geodynamics.org wrote:
> Send CIG-SHORT mailing list submissions to
> cig-short at geodynamics.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
> or, via email, send a message with subject or body 'help' to
> cig-short-request at geodynamics.org
>
> You can reach the person managing the list at
> cig-short-owner at geodynamics.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of CIG-SHORT digest..."
>
>
> Today's Topics:
>
> 1. Re: Rate and State and Initial Traction (Brad Aagaard)
> 2. Re: Rate and State and Initial Traction (Matthew Knepley)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 30 Aug 2012 14:14:31 -0700
> From: Brad Aagaard <baagaard at usgs.gov>
> Subject: Re: [CIG-SHORT] Rate and State and Initial Traction
> To: Matthew Knepley <knepley at mcs.anl.gov>
> Cc: cig-short at geodynamics.org
> Message-ID: <503FD7B7.3050102 at usgs.gov>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Matt,
>
> I suggested that Romain change ksp_rtol only, not ksp_atol. The relative
> tolerance will be small enough so that the absolute tolerance (1.0e-12)
> will be what stops the KSP solve.
>
> Brad
>
>
> On 08/30/2012 02:08 PM, Matthew Knepley wrote:
>> On Thu, Aug 30, 2012 at 4:04 PM, Brad Aagaard <baagaard at usgs.gov> wrote:
>>
>>> Romain,
>>>
>>> The stacktrace shows which solve is encountering inf or nan. The routine
>>> is _sensitivitySolve(). This is the solve associated with determining
>>> how much to increment the slip to match the friction criterion.
>>>
>>> However, it looks like the problem is in the KSP solver tolerances. Note
>>> that the solver stops with a residual of 2e-10 due to ksp_rtol being
>>> met. However, the friction_tolerance is (by default) 1.0e-10. The error
>>> in the solution is on the order of 2.0e-10 but the tolerance for
>>> detecting whether a point is slipping is 1.0e-10. You want the error in
>>> the linear solution to be smaller than the tolerance for detecting
>>> sliding. This means you should reduce your ksp_rtol to something much
>>> smaller, like 1.0e-20, to force ksp_atol to control convergence.
>>> Usually, the starting residual is a few orders of magnitude smaller than
>>> what you have so the tolerances I suggested work.
>>>
>>
>> Okay, last time I told him not to use anything less than 1e-16 since there
>> are funny effects below roundoff. Could you try 1e-15?
>>
>> We do need consistency checks in these nested iterations.
>>
>> Thanks,
>>
>> Matt
>>
>>
>>> Bottom line: Quasi-static friction solves generally require the linear
>>> solves to converge due to the absolute tolerance, which *must* be
>>> smaller than the zero_tolerance for friction.
>>>
>>> We will look into adding more consistency checking into the code to try
>>> and catch these types of errors.
>>>
>>> Regards,
>>> Brad
>>>
>>>
>>> On 08/30/2012 01:38 PM, Romain Jolivet wrote:
>>>> Thanks for the advice. I changed the preconditioner settings to what you
>>> suggested. I don't see that jump in the linear norm anymore.
>>>> However, I still have the floating point exception problem. This arise
>>> after the first round of ksp.
>>>>
>>>> In the log file (attached), I see to messages saying the ksp solver for
>>> friction does converge (twice), then the SNES residual norm is printed,
>>> then KSP starts, and when it has to compute the new SNES residual norm, it
>>> says that VecNorm() encoutered a Inf or NAN value:
>>>>
>>>> 141 KSP Residual norm 1.185626397065e-09
>>>> 142 KSP Residual norm 8.558244459183e-10
>>>> 143 KSP Residual norm 4.537120666370e-10
>>>> 144 KSP Residual norm 2.695590025796e-10
>>>> 145 KSP Residual norm 2.263153111449e-10
>>>> 146 KSP Residual norm 2.156010427246e-10
>>>> Linear solve converged due to CONVERGED_RTOL iterations 146
>>>> [0]PETSC ERROR: --------------------- Error Message
>>> ------------------------------------
>>>> [0]PETSC ERROR: Floating point exception!
>>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>>> [0]PETSC ERROR: Petsc Development HG revision:
>>> 3bede28f1195e406d4257c9fbeebefe827793801 HG Date: Mon Jun 11 22:14:12 2012
>>> -0400
>>>> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
>>>> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
>>>> [0]PETSC ERROR: See docs/index.html for manual pages.
>>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>>> [0]PETSC ERROR:
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/mpinemesis
>>> on a pylith-da named dhcp-74-229.caltech.edu by jolivetinsar Thu Aug 30
>>> 13:34:55 2012
>>>> [0]PETSC ERROR: Libraries linked from
>>> /Users/buildbot/install/pylith_darwin_10.6_binbot/lib
>>>> [0]PETSC ERROR: Configure run at Tue Jun 12 06:09:00 2012
>>>> [0]PETSC ERROR: Configure options
>>> --prefix=/Users/buildbot/install/pylith_darwin_10.6_binbot
>>> --download-f-blas-lapack=1 --with-sieve=1 --with-c2html=0
>>> --CXXFLAGS=-DMPICH_IGNORE_CXX_SEEK --with-clanguage=C++
>>> --with-mpicompilers=1 --with-debugging=0 --download-chaco=1
>>> --download-boost=1 --download-ml=1 --with-hdf5=1
>>> --with-hdf5-dir=/Users/buildbot/install/pylith_darwin_10.6_binbot
>>> --with-x=0 --with-shared-libraries=1
>>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>>> [0]PETSC ERROR: VecNorm() line 169 in src/vec/vec/interface/rvector.c
>>>> [0]PETSC ERROR: VecNormalize() line 263 in
>>> src/vec/vec/interface/rvector.c
>>>> [0]PETSC ERROR: KSPGMRESCycle() line 127 in
>>> src/ksp/ksp/impls/gmres/gmres.c
>>>> [0]PETSC ERROR: KSPSolve_GMRES() line 231 in
>>> src/ksp/ksp/impls/gmres/gmres.c
>>>> [0]PETSC ERROR: KSPSolve() line 446 in src/ksp/ksp/interface/itfunc.c
>>>> [0]PETSC ERROR: _sensitivitySolve() line 2172 in
>>> "unknowndirectory/"faults/FaultCohesiveDyn.cc
>>>> Traceback (most recent call last):
>>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/apps/PetscApplication.py",
>>> line 65, in onComputeNodes
>>>> Fatal error. Calling MPI_Abort() to abort PyLith application.
>>>> self.main(*args, **kwds)
>>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/apps/PyLithApp.py",
>>> line 119, in main
>>>> self.problem.run(self)
>>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/TimeDependent.py",
>>> line 154, in run
>>>> self.formulation.step(t, dt)
>>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py",
>>> line 219, in step
>>>> self.solver.solve(dispIncr, self.jacobian, residual)
>>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/problems.py",
>>> line 180, in solve
>>>> def solve(self, *args): return
>>> _problems.SolverNonlinear_solve(self, *args)
>>>> RuntimeError: std::exception
>>>> application called MPI_Abort(MPI_COMM_WORLD, -1) - process 0
>>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis:
>>> mpirun: exit 255
>>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/pylith:
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis:
>>> exit 1
>>>>
>>>> Any idea?
>>>> Romain
>>>>
>>>>
>>>>
>>>> Romain Jolivet
>>>> Postdoctoral Scholar
>>>> Geological and Planetary Sciences
>>>> California Institute of Technology, Pasadena, CA
>>>> rjolivet at caltech.edu
>>>> +1 (626) 560 6356
>>>>
>>>> On Aug 30, 2012, at 12:00 PM, cig-short-request at geodynamics.org wrote:
>>>>
>>>>> Send CIG-SHORT mailing list submissions to
>>>>> cig-short at geodynamics.org
>>>>>
>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>> or, via email, send a message with subject or body 'help' to
>>>>> cig-short-request at geodynamics.org
>>>>>
>>>>> You can reach the person managing the list at
>>>>> cig-short-owner at geodynamics.org
>>>>>
>>>>> When replying, please edit your Subject line so it is more specific
>>>>> than "Re: Contents of CIG-SHORT digest..."
>>>>>
>>>>>
>>>>> Today's Topics:
>>>>>
>>>>> 1. Re: Rate and State and Initial Traction (Brad Aagaard)
>>>>> 2. Fwd: Rate and State and Initial Traction (Matthew Knepley)
>>>>>
>>>>>
>>>>> ----------------------------------------------------------------------
>>>>>
>>>>> Message: 1
>>>>> Date: Wed, 29 Aug 2012 12:36:08 -0700
>>>>> From: Brad Aagaard <baagaard at usgs.gov>
>>>>> Subject: Re: [CIG-SHORT] Rate and State and Initial Traction
>>>>> To: cig-short at geodynamics.org
>>>>> Message-ID: <503E6F28.6050001 at usgs.gov>
>>>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>>>>
>>>>> Romain,
>>>>>
>>>>> It looks like you are using Schur complement preconditioner settings.
>>>>> The jump in the KSP residual at iteration 10 is odd and suggests
>>>>> something is not quite right in the linear solve (probably related to
>>>>> the preconditioner). Try using the AMG preconditioner. It may not be
>>>>> quite as fast but it is more robust. Matt can probably help you tune the
>>>>> Schur complement solver conditions some more if necessary.
>>>>>
>>>>> Your SNES tolerances are quite large. I suggest using tolerances similar
>>>>> to those in examples/3d/hex8/step14.cfg.
>>>>>
>>>>> SOLVER TOLERANCES
>>>>>
>>>>> ksp_rtol = 1.0e-16
>>>>> ksp_atol = 1.0e-12
>>>>>
>>>>> snes_rtol = 1.0e-14
>>>>> snes_atol = 1.0e-10
>>>>>
>>>>>
>>>>> AMG PRECONDITIONER SETTINGS
>>>>>
>>>>> [pylithapp.timedependent.formulation]
>>>>> split_fields = True
>>>>> matrix_type = aij
>>>>>
>>>>> [pylithapp.petsc]
>>>>> ksp_gmres_restart = 100
>>>>> fs_pc_type = fieldsplit
>>>>> fs_pc_fieldsplit_real_diagonal = true
>>>>> fs_pc_fieldsplit_type = multiplicative
>>>>> fs_fieldsplit_0_pc_type = ml
>>>>> fs_fieldsplit_1_pc_type = jacobi
>>>>> fs_fieldsplit_0_ksp_type = preonly
>>>>> fs_fieldsplit_1_ksp_type = preonly
>>>>>
>>>>> Brad
>>>>>
>>>>>
>>>>> On 08/29/2012 11:42 AM, Romain Jolivet wrote:
>>>>>> Hello Brad, Matt, Charles and the pylith team,
>>>>>>
>>>>>> Following your advice from the other day, I am experimenting how to
>>> create earthquakes on a frictional interface by applying a traction change
>>> history. It works fine with the SlipWeakening law in 2D. I'm trying to move
>>> on to the RateStateAgeing behavior and I have problems applying the initial
>>> traction conditions:
>>>>>>
>>>>>> I use a SimpleDB to apply the frictional properties on the fault: one
>>> domain is rate-strengthening, the other is rate-weakening with a linear
>>> transition between the two domains. If I do not try to turn on any
>>> traction_perturbation option, the code runs great, and I have a slow slip
>>> all the along the fault at any time.
>>>>>>
>>>>>> As I want the rate-weakening domain to be stuck sometimes, I want to
>>> turn on traction_perturbation.db_initial. I use a SimpleDB to put a
>>> negative traction all along the fault, and a shear traction compatible with
>>> the friction coefficients I impose. However, when I run this, I have the
>>> following error message from PETSc (I attach the log):
>>>>>>
>>>>>>>>
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py:215:step
>>>>>> -- implicit(info)
>>>>>> -- Solving equations.
>>>>>> 0 SNES Function norm 2.679589636063e+01
>>>>>> 0 KSP Residual norm 9.637565795900e-01
>>>>>> 1 KSP Residual norm 3.564937135471e-08
>>>>>> 2 KSP Residual norm 4.313963401911e-16
>>>>>> 3 KSP Residual norm 3.050427683646e-16
>>>>>> 4 KSP Residual norm 2.490663081181e-16
>>>>>> 5 KSP Residual norm 2.156976950523e-16
>>>>>> 6 KSP Residual norm 1.929258577738e-16
>>>>>> 7 KSP Residual norm 1.761163907914e-16
>>>>>> 8 KSP Residual norm 1.630520838230e-16
>>>>>> 9 KSP Residual norm 1.525212509706e-16
>>>>>> 10 KSP Residual norm 1.833325155789e-11
>>>>>> 11 KSP Residual norm 7.039784754868e-23
>>>>>> Linear solve converged due to CONVERGED_ATOL iterations 11
>>>>>> [0]PETSC ERROR: --------------------- Error Message
>>> ------------------------------------
>>>>>> [0]PETSC ERROR: Floating point exception!
>>>>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>>>>>
>>>>>> If anyone has an idea about that error message....
>>>>>>
>>>>>> I think it has to do with some slip vector. If I set
>>> friction.min_slip_rate=1e-1, this problem does not happen (the nonlinear
>>> solver does not converge, but at least, no crash). If I set the normal
>>> traction to be positive, it does not crash as well (and it does not
>>> converge as well). I join to this message the cfg file I am using for that
>>> experiment.
>>>>>>
>>>>>> Thank you
>>>>>> Romain
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Romain Jolivet
>>>>>> Postdoctoral Scholar
>>>>>> Geological and Planetary Sciences
>>>>>> California Institute of Technology, Pasadena, CA
>>>>>> rjolivet at caltech.edu
>>>>>> +1 (626) 560 6356
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> CIG-SHORT mailing list
>>>>>> CIG-SHORT at geodynamics.org
>>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------
>>>>>
>>>>> Message: 2
>>>>> Date: Wed, 29 Aug 2012 22:09:25 -0500
>>>>> From: Matthew Knepley <knepley at mcs.anl.gov>
>>>>> Subject: [CIG-SHORT] Fwd: Rate and State and Initial Traction
>>>>> To: cig-short at geodynamics.org
>>>>> Message-ID:
>>>>> <CAMYG4GkMcUqRjhMaYZ8Ooj-x=
>>> 06QKFrc7fiwW1dStmDSDO1qWA at mail.gmail.com>
>>>>> Content-Type: text/plain; charset="iso-8859-1"
>>>>>
>>>>> On Wed, Aug 29, 2012 at 2:36 PM, Brad Aagaard <baagaard at usgs.gov>
>>> wrote:
>>>>>
>>>>>> Romain,
>>>>>>
>>>>>> It looks like you are using Schur complement preconditioner settings.
>>>>>> The jump in the KSP residual at iteration 10 is odd and suggests
>>>>>> something is not quite right in the linear solve (probably related to
>>>>>>
>>>>>
>>>>> Brad is right that the tolerances here will produce some garbage. Going
>>>>> below
>>>>> machine epsilon (about 10^-16) means you get randomness and ultimately
>>>>> underflow which I think you got in a norm calculation since things get
>>>>> squared.
>>>>> The solver should have converged on iterate 2, and will with the
>>> tolerances
>>>>> that
>>>>> Brad suggested.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Matt
>>>>>
>>>>>
>>>>>> the preconditioner). Try using the AMG preconditioner. It may not be
>>>>>> quite as fast but it is more robust. Matt can probably help you tune
>>> the
>>>>>> Schur complement solver conditions some more if necessary.
>>>>>>
>>>>>> Your SNES tolerances are quite large. I suggest using tolerances
>>> similar
>>>>>> to those in examples/3d/hex8/step14.cfg.
>>>>>>
>>>>>> SOLVER TOLERANCES
>>>>>>
>>>>>> ksp_rtol = 1.0e-16
>>>>>> ksp_atol = 1.0e-12
>>>>>>
>>>>>> snes_rtol = 1.0e-14
>>>>>> snes_atol = 1.0e-10
>>>>>>
>>>>>>
>>>>>> AMG PRECONDITIONER SETTINGS
>>>>>>
>>>>>> [pylithapp.timedependent.formulation]
>>>>>> split_fields = True
>>>>>> matrix_type = aij
>>>>>>
>>>>>> [pylithapp.petsc]
>>>>>> ksp_gmres_restart = 100
>>>>>> fs_pc_type = fieldsplit
>>>>>> fs_pc_fieldsplit_real_diagonal = true
>>>>>> fs_pc_fieldsplit_type = multiplicative
>>>>>> fs_fieldsplit_0_pc_type = ml
>>>>>> fs_fieldsplit_1_pc_type = jacobi
>>>>>> fs_fieldsplit_0_ksp_type = preonly
>>>>>> fs_fieldsplit_1_ksp_type = preonly
>>>>>>
>>>>>> Brad
>>>>>>
>>>>>>
>>>>>> On 08/29/2012 11:42 AM, Romain Jolivet wrote:
>>>>>>> Hello Brad, Matt, Charles and the pylith team,
>>>>>>>
>>>>>>> Following your advice from the other day, I am experimenting how to
>>>>>> create earthquakes on a frictional interface by applying a traction
>>> change
>>>>>> history. It works fine with the SlipWeakening law in 2D. I'm trying to
>>> move
>>>>>> on to the RateStateAgeing behavior and I have problems applying the
>>> initial
>>>>>> traction conditions:
>>>>>>>
>>>>>>> I use a SimpleDB to apply the frictional properties on the fault: one
>>>>>> domain is rate-strengthening, the other is rate-weakening with a linear
>>>>>> transition between the two domains. If I do not try to turn on any
>>>>>> traction_perturbation option, the code runs great, and I have a slow
>>> slip
>>>>>> all the along the fault at any time.
>>>>>>>
>>>>>>> As I want the rate-weakening domain to be stuck sometimes, I want to
>>>>>> turn on traction_perturbation.db_initial. I use a SimpleDB to put a
>>>>>> negative traction all along the fault, and a shear traction compatible
>>> with
>>>>>> the friction coefficients I impose. However, when I run this, I have
>>> the
>>>>>> following error message from PETSc (I attach the log):
>>>>>>>
>>>>>>>>>
>>>>>>
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py:215:step
>>>>>>> -- implicit(info)
>>>>>>> -- Solving equations.
>>>>>>> 0 SNES Function norm 2.679589636063e+01
>>>>>>> 0 KSP Residual norm 9.637565795900e-01
>>>>>>> 1 KSP Residual norm 3.564937135471e-08
>>>>>>> 2 KSP Residual norm 4.313963401911e-16
>>>>>>> 3 KSP Residual norm 3.050427683646e-16
>>>>>>> 4 KSP Residual norm 2.490663081181e-16
>>>>>>> 5 KSP Residual norm 2.156976950523e-16
>>>>>>> 6 KSP Residual norm 1.929258577738e-16
>>>>>>> 7 KSP Residual norm 1.761163907914e-16
>>>>>>> 8 KSP Residual norm 1.630520838230e-16
>>>>>>> 9 KSP Residual norm 1.525212509706e-16
>>>>>>> 10 KSP Residual norm 1.833325155789e-11
>>>>>>> 11 KSP Residual norm 7.039784754868e-23
>>>>>>> Linear solve converged due to CONVERGED_ATOL iterations 11
>>>>>>> [0]PETSC ERROR: --------------------- Error Message
>>>>>> ------------------------------------
>>>>>>> [0]PETSC ERROR: Floating point exception!
>>>>>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>>>>>>
>>>>>>> If anyone has an idea about that error message....
>>>>>>>
>>>>>>> I think it has to do with some slip vector. If I set
>>>>>> friction.min_slip_rate=1e-1, this problem does not happen (the
>>> nonlinear
>>>>>> solver does not converge, but at least, no crash). If I set the normal
>>>>>> traction to be positive, it does not crash as well (and it does not
>>>>>> converge as well). I join to this message the cfg file I am using for
>>> that
>>>>>> experiment.
>>>>>>>
>>>>>>> Thank you
>>>>>>> Romain
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Romain Jolivet
>>>>>>> Postdoctoral Scholar
>>>>>>> Geological and Planetary Sciences
>>>>>>> California Institute of Technology, Pasadena, CA
>>>>>>> rjolivet at caltech.edu
>>>>>>> +1 (626) 560 6356
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> CIG-SHORT mailing list
>>>>>>> CIG-SHORT at geodynamics.org
>>>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> CIG-SHORT mailing list
>>>>>> CIG-SHORT at geodynamics.org
>>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>> -------------- next part --------------
>>>>> An HTML attachment was scrubbed...
>>>>> URL:
>>> http://geodynamics.org/pipermail/cig-short/attachments/20120829/9e91899c/attachment.html
>>>>>
>>>>> ------------------------------
>>>>>
>>>>> _______________________________________________
>>>>> CIG-SHORT mailing list
>>>>> CIG-SHORT at geodynamics.org
>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>
>>>>>
>>>>> End of CIG-SHORT Digest, Vol 72, Issue 21
>>>>> *****************************************
>>>>
>>>> _______________________________________________
>>>> CIG-SHORT mailing list
>>>> CIG-SHORT at geodynamics.org
>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>
>>>
>>> _______________________________________________
>>> CIG-SHORT mailing list
>>> CIG-SHORT at geodynamics.org
>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>
>>
>>
>>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 30 Aug 2012 16:19:45 -0500
> From: Matthew Knepley <knepley at mcs.anl.gov>
> Subject: Re: [CIG-SHORT] Rate and State and Initial Traction
> To: Romain Jolivet <rjolivet at caltech.edu>
> Cc: cig-short at geodynamics.org
> Message-ID:
> <CAMYG4GkacxPh4TMvcXeWu84bFdzqvVuaQcd7mvXQJGdtddzkMw at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Thu, Aug 30, 2012 at 4:11 PM, Romain Jolivet <rjolivet at caltech.edu>wrote:
>
>> I did just run:
>>
>> pylith step01.cfg --petsc.fp_trap=0
>>
>> Is that what you meant? If it is, I still have the same problem :-) and it
>> does not change what I see on the screen. Should it change something?\
>>
>
> Then it is not underflow.
>
>
>> However, the norm computation problem does not appear when I set the
>> zero_tolerance to 1.0 (it does not converge though, but I don't have this
>> Floating point exception...)
>>
>
> As Brad says, change the relative tolerance, but leave the absolute
> tolerance intact.
>
> Matt
>
>
>> Romain
>>
>>
>> Romain Jolivet
>> Postdoctoral Scholar
>> Geological and Planetary Sciences
>> California Institute of Technology, Pasadena, CA
>> rjolivet at caltech.edu
>> +1 (626) 560 6356
>>
>> On Aug 30, 2012, at 2:00 PM, Matthew Knepley wrote:
>>
>> On Thu, Aug 30, 2012 at 3:38 PM, Romain Jolivet <rjolivet at caltech.edu>wrote:
>>
>>> Thanks for the advice. I changed the preconditioner settings to what you
>>> suggested. I don't see that jump in the linear norm anymore.
>>> However, I still have the floating point exception problem. This arise
>>> after the first round of ksp.
>>>
>>> In the log file (attached), I see to messages saying the ksp solver for
>>> friction does converge (twice), then the SNES residual norm is printed,
>>> then KSP starts, and when it has to compute the new SNES residual norm, it
>>> says that VecNorm() encoutered a Inf or NAN value:
>>>
>>
>> It could still be underflow. Try running with --petsc.fp_trap=0
>>
>> Thanks,
>>
>> Matt
>>
>>
>>> 141 KSP Residual norm 1.185626397065e-09
>>> 142 KSP Residual norm 8.558244459183e-10
>>> 143 KSP Residual norm 4.537120666370e-10
>>> 144 KSP Residual norm 2.695590025796e-10
>>> 145 KSP Residual norm 2.263153111449e-10
>>> 146 KSP Residual norm 2.156010427246e-10
>>> Linear solve converged due to CONVERGED_RTOL iterations 146
>>> [0]PETSC ERROR: --------------------- Error Message
>>> ------------------------------------
>>> [0]PETSC ERROR: Floating point exception!
>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>> [0]PETSC ERROR: Petsc Development HG revision:
>>> 3bede28f1195e406d4257c9fbeebefe827793801 HG Date: Mon Jun 11 22:14:12 2012
>>> -0400
>>> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
>>> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
>>> [0]PETSC ERROR: See docs/index.html for manual pages.
>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>> [0]PETSC ERROR:
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/mpinemesis
>>> on a pylith-da named dhcp-74-229.caltech.edu by jolivetinsar Thu Aug 30
>>> 13:34:55 2012
>>> [0]PETSC ERROR: Libraries linked from
>>> /Users/buildbot/install/pylith_darwin_10.6_binbot/lib
>>> [0]PETSC ERROR: Configure run at Tue Jun 12 06:09:00 2012
>>> [0]PETSC ERROR: Configure options
>>> --prefix=/Users/buildbot/install/pylith_darwin_10.6_binbot
>>> --download-f-blas-lapack=1 --with-sieve=1 --with-c2html=0
>>> --CXXFLAGS=-DMPICH_IGNORE_CXX_SEEK --with-clanguage=C++
>>> --with-mpicompilers=1 --with-debugging=0 --download-chaco=1
>>> --download-boost=1 --download-ml=1 --with-hdf5=1
>>> --with-hdf5-dir=/Users/buildbot/install/pylith_darwin_10.6_binbot
>>> --with-x=0 --with-shared-libraries=1
>>> [0]PETSC ERROR:
>>> ------------------------------------------------------------------------
>>> [0]PETSC ERROR: VecNorm() line 169 in src/vec/vec/interface/rvector.c
>>> [0]PETSC ERROR: VecNormalize() line 263 in src/vec/vec/interface/rvector.c
>>> [0]PETSC ERROR: KSPGMRESCycle() line 127 in
>>> src/ksp/ksp/impls/gmres/gmres.c
>>> [0]PETSC ERROR: KSPSolve_GMRES() line 231 in
>>> src/ksp/ksp/impls/gmres/gmres.c
>>> [0]PETSC ERROR: KSPSolve() line 446 in src/ksp/ksp/interface/itfunc.c
>>> [0]PETSC ERROR: _sensitivitySolve() line 2172 in
>>> "unknowndirectory/"faults/FaultCohesiveDyn.cc
>>> Traceback (most recent call last):
>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/apps/PetscApplication.py",
>>> line 65, in onComputeNodes
>>> Fatal error. Calling MPI_Abort() to abort PyLith application.
>>> self.main(*args, **kwds)
>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/apps/PyLithApp.py",
>>> line 119, in main
>>> self.problem.run(self)
>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/TimeDependent.py",
>>> line 154, in run
>>> self.formulation.step(t, dt)
>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py",
>>> line 219, in step
>>> self.solver.solve(dispIncr, self.jacobian, residual)
>>> File
>>> "/Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/problems.py",
>>> line 180, in solve
>>> def solve(self, *args): return _problems.SolverNonlinear_solve(self,
>>> *args)
>>> RuntimeError: std::exception
>>> application called MPI_Abort(MPI_COMM_WORLD, -1) - process 0
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis:
>>> mpirun: exit 255
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/pylith:
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/bin/nemesis:
>>> exit 1
>>>
>>> Any idea?
>>> Romain
>>>
>>>
>>>
>>> Romain Jolivet
>>> Postdoctoral Scholar
>>> Geological and Planetary Sciences
>>> California Institute of Technology, Pasadena, CA
>>> rjolivet at caltech.edu
>>> +1 (626) 560 6356
>>>
>>> On Aug 30, 2012, at 12:00 PM, cig-short-request at geodynamics.org wrote:
>>>
>>>> Send CIG-SHORT mailing list submissions to
>>>> cig-short at geodynamics.org
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>> or, via email, send a message with subject or body 'help' to
>>>> cig-short-request at geodynamics.org
>>>>
>>>> You can reach the person managing the list at
>>>> cig-short-owner at geodynamics.org
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of CIG-SHORT digest..."
>>>>
>>>>
>>>> Today's Topics:
>>>>
>>>> 1. Re: Rate and State and Initial Traction (Brad Aagaard)
>>>> 2. Fwd: Rate and State and Initial Traction (Matthew Knepley)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Wed, 29 Aug 2012 12:36:08 -0700
>>>> From: Brad Aagaard <baagaard at usgs.gov>
>>>> Subject: Re: [CIG-SHORT] Rate and State and Initial Traction
>>>> To: cig-short at geodynamics.org
>>>> Message-ID: <503E6F28.6050001 at usgs.gov>
>>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>>>
>>>> Romain,
>>>>
>>>> It looks like you are using Schur complement preconditioner settings.
>>>> The jump in the KSP residual at iteration 10 is odd and suggests
>>>> something is not quite right in the linear solve (probably related to
>>>> the preconditioner). Try using the AMG preconditioner. It may not be
>>>> quite as fast but it is more robust. Matt can probably help you tune the
>>>> Schur complement solver conditions some more if necessary.
>>>>
>>>> Your SNES tolerances are quite large. I suggest using tolerances similar
>>>> to those in examples/3d/hex8/step14.cfg.
>>>>
>>>> SOLVER TOLERANCES
>>>>
>>>> ksp_rtol = 1.0e-16
>>>> ksp_atol = 1.0e-12
>>>>
>>>> snes_rtol = 1.0e-14
>>>> snes_atol = 1.0e-10
>>>>
>>>>
>>>> AMG PRECONDITIONER SETTINGS
>>>>
>>>> [pylithapp.timedependent.formulation]
>>>> split_fields = True
>>>> matrix_type = aij
>>>>
>>>> [pylithapp.petsc]
>>>> ksp_gmres_restart = 100
>>>> fs_pc_type = fieldsplit
>>>> fs_pc_fieldsplit_real_diagonal = true
>>>> fs_pc_fieldsplit_type = multiplicative
>>>> fs_fieldsplit_0_pc_type = ml
>>>> fs_fieldsplit_1_pc_type = jacobi
>>>> fs_fieldsplit_0_ksp_type = preonly
>>>> fs_fieldsplit_1_ksp_type = preonly
>>>>
>>>> Brad
>>>>
>>>>
>>>> On 08/29/2012 11:42 AM, Romain Jolivet wrote:
>>>>> Hello Brad, Matt, Charles and the pylith team,
>>>>>
>>>>> Following your advice from the other day, I am experimenting how to
>>> create earthquakes on a frictional interface by applying a traction change
>>> history. It works fine with the SlipWeakening law in 2D. I'm trying to move
>>> on to the RateStateAgeing behavior and I have problems applying the initial
>>> traction conditions:
>>>>>
>>>>> I use a SimpleDB to apply the frictional properties on the fault: one
>>> domain is rate-strengthening, the other is rate-weakening with a linear
>>> transition between the two domains. If I do not try to turn on any
>>> traction_perturbation option, the code runs great, and I have a slow slip
>>> all the along the fault at any time.
>>>>>
>>>>> As I want the rate-weakening domain to be stuck sometimes, I want to
>>> turn on traction_perturbation.db_initial. I use a SimpleDB to put a
>>> negative traction all along the fault, and a shear traction compatible with
>>> the friction coefficients I impose. However, when I run this, I have the
>>> following error message from PETSc (I attach the log):
>>>>>
>>>>>>>
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py:215:step
>>>>> -- implicit(info)
>>>>> -- Solving equations.
>>>>> 0 SNES Function norm 2.679589636063e+01
>>>>> 0 KSP Residual norm 9.637565795900e-01
>>>>> 1 KSP Residual norm 3.564937135471e-08
>>>>> 2 KSP Residual norm 4.313963401911e-16
>>>>> 3 KSP Residual norm 3.050427683646e-16
>>>>> 4 KSP Residual norm 2.490663081181e-16
>>>>> 5 KSP Residual norm 2.156976950523e-16
>>>>> 6 KSP Residual norm 1.929258577738e-16
>>>>> 7 KSP Residual norm 1.761163907914e-16
>>>>> 8 KSP Residual norm 1.630520838230e-16
>>>>> 9 KSP Residual norm 1.525212509706e-16
>>>>> 10 KSP Residual norm 1.833325155789e-11
>>>>> 11 KSP Residual norm 7.039784754868e-23
>>>>> Linear solve converged due to CONVERGED_ATOL iterations 11
>>>>> [0]PETSC ERROR: --------------------- Error Message
>>> ------------------------------------
>>>>> [0]PETSC ERROR: Floating point exception!
>>>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>>>>
>>>>> If anyone has an idea about that error message....
>>>>>
>>>>> I think it has to do with some slip vector. If I set
>>> friction.min_slip_rate=1e-1, this problem does not happen (the nonlinear
>>> solver does not converge, but at least, no crash). If I set the normal
>>> traction to be positive, it does not crash as well (and it does not
>>> converge as well). I join to this message the cfg file I am using for that
>>> experiment.
>>>>>
>>>>> Thank you
>>>>> Romain
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Romain Jolivet
>>>>> Postdoctoral Scholar
>>>>> Geological and Planetary Sciences
>>>>> California Institute of Technology, Pasadena, CA
>>>>> rjolivet at caltech.edu
>>>>> +1 (626) 560 6356
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> CIG-SHORT mailing list
>>>>> CIG-SHORT at geodynamics.org
>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------
>>>>
>>>> Message: 2
>>>> Date: Wed, 29 Aug 2012 22:09:25 -0500
>>>> From: Matthew Knepley <knepley at mcs.anl.gov>
>>>> Subject: [CIG-SHORT] Fwd: Rate and State and Initial Traction
>>>> To: cig-short at geodynamics.org
>>>> Message-ID:
>>>> <CAMYG4GkMcUqRjhMaYZ8Ooj-x=
>>> 06QKFrc7fiwW1dStmDSDO1qWA at mail.gmail.com>
>>>> Content-Type: text/plain; charset="iso-8859-1"
>>>>
>>>> On Wed, Aug 29, 2012 at 2:36 PM, Brad Aagaard <baagaard at usgs.gov>
>>> wrote:
>>>>
>>>>> Romain,
>>>>>
>>>>> It looks like you are using Schur complement preconditioner settings.
>>>>> The jump in the KSP residual at iteration 10 is odd and suggests
>>>>> something is not quite right in the linear solve (probably related to
>>>>>
>>>>
>>>> Brad is right that the tolerances here will produce some garbage. Going
>>>> below
>>>> machine epsilon (about 10^-16) means you get randomness and ultimately
>>>> underflow which I think you got in a norm calculation since things get
>>>> squared.
>>>> The solver should have converged on iterate 2, and will with the
>>> tolerances
>>>> that
>>>> Brad suggested.
>>>>
>>>> Thanks,
>>>>
>>>> Matt
>>>>
>>>>
>>>>> the preconditioner). Try using the AMG preconditioner. It may not be
>>>>> quite as fast but it is more robust. Matt can probably help you tune
>>> the
>>>>> Schur complement solver conditions some more if necessary.
>>>>>
>>>>> Your SNES tolerances are quite large. I suggest using tolerances
>>> similar
>>>>> to those in examples/3d/hex8/step14.cfg.
>>>>>
>>>>> SOLVER TOLERANCES
>>>>>
>>>>> ksp_rtol = 1.0e-16
>>>>> ksp_atol = 1.0e-12
>>>>>
>>>>> snes_rtol = 1.0e-14
>>>>> snes_atol = 1.0e-10
>>>>>
>>>>>
>>>>> AMG PRECONDITIONER SETTINGS
>>>>>
>>>>> [pylithapp.timedependent.formulation]
>>>>> split_fields = True
>>>>> matrix_type = aij
>>>>>
>>>>> [pylithapp.petsc]
>>>>> ksp_gmres_restart = 100
>>>>> fs_pc_type = fieldsplit
>>>>> fs_pc_fieldsplit_real_diagonal = true
>>>>> fs_pc_fieldsplit_type = multiplicative
>>>>> fs_fieldsplit_0_pc_type = ml
>>>>> fs_fieldsplit_1_pc_type = jacobi
>>>>> fs_fieldsplit_0_ksp_type = preonly
>>>>> fs_fieldsplit_1_ksp_type = preonly
>>>>>
>>>>> Brad
>>>>>
>>>>>
>>>>> On 08/29/2012 11:42 AM, Romain Jolivet wrote:
>>>>>> Hello Brad, Matt, Charles and the pylith team,
>>>>>>
>>>>>> Following your advice from the other day, I am experimenting how to
>>>>> create earthquakes on a frictional interface by applying a traction
>>> change
>>>>> history. It works fine with the SlipWeakening law in 2D. I'm trying to
>>> move
>>>>> on to the RateStateAgeing behavior and I have problems applying the
>>> initial
>>>>> traction conditions:
>>>>>>
>>>>>> I use a SimpleDB to apply the frictional properties on the fault: one
>>>>> domain is rate-strengthening, the other is rate-weakening with a linear
>>>>> transition between the two domains. If I do not try to turn on any
>>>>> traction_perturbation option, the code runs great, and I have a slow
>>> slip
>>>>> all the along the fault at any time.
>>>>>>
>>>>>> As I want the rate-weakening domain to be stuck sometimes, I want to
>>>>> turn on traction_perturbation.db_initial. I use a SimpleDB to put a
>>>>> negative traction all along the fault, and a shear traction compatible
>>> with
>>>>> the friction coefficients I impose. However, when I run this, I have
>>> the
>>>>> following error message from PETSc (I attach the log):
>>>>>>
>>>>>>>>
>>>>>
>>> /Users/jolivetinsar/MYBIN/pylith/pylith-1.7.1-darwin-10.6.8/lib/python2.7/site-packages/pylith/problems/Implicit.py:215:step
>>>>>> -- implicit(info)
>>>>>> -- Solving equations.
>>>>>> 0 SNES Function norm 2.679589636063e+01
>>>>>> 0 KSP Residual norm 9.637565795900e-01
>>>>>> 1 KSP Residual norm 3.564937135471e-08
>>>>>> 2 KSP Residual norm 4.313963401911e-16
>>>>>> 3 KSP Residual norm 3.050427683646e-16
>>>>>> 4 KSP Residual norm 2.490663081181e-16
>>>>>> 5 KSP Residual norm 2.156976950523e-16
>>>>>> 6 KSP Residual norm 1.929258577738e-16
>>>>>> 7 KSP Residual norm 1.761163907914e-16
>>>>>> 8 KSP Residual norm 1.630520838230e-16
>>>>>> 9 KSP Residual norm 1.525212509706e-16
>>>>>> 10 KSP Residual norm 1.833325155789e-11
>>>>>> 11 KSP Residual norm 7.039784754868e-23
>>>>>> Linear solve converged due to CONVERGED_ATOL iterations 11
>>>>>> [0]PETSC ERROR: --------------------- Error Message
>>>>> ------------------------------------
>>>>>> [0]PETSC ERROR: Floating point exception!
>>>>>> [0]PETSC ERROR: Infinite or not-a-number generated in norm!
>>>>>>
>>>>>> If anyone has an idea about that error message....
>>>>>>
>>>>>> I think it has to do with some slip vector. If I set
>>>>> friction.min_slip_rate=1e-1, this problem does not happen (the
>>> nonlinear
>>>>> solver does not converge, but at least, no crash). If I set the normal
>>>>> traction to be positive, it does not crash as well (and it does not
>>>>> converge as well). I join to this message the cfg file I am using for
>>> that
>>>>> experiment.
>>>>>>
>>>>>> Thank you
>>>>>> Romain
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Romain Jolivet
>>>>>> Postdoctoral Scholar
>>>>>> Geological and Planetary Sciences
>>>>>> California Institute of Technology, Pasadena, CA
>>>>>> rjolivet at caltech.edu
>>>>>> +1 (626) 560 6356
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> CIG-SHORT mailing list
>>>>>> CIG-SHORT at geodynamics.org
>>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> CIG-SHORT mailing list
>>>>> CIG-SHORT at geodynamics.org
>>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> 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
>>>> -------------- next part --------------
>>>> An HTML attachment was scrubbed...
>>>> URL:
>>> http://geodynamics.org/pipermail/cig-short/attachments/20120829/9e91899c/attachment.html
>>>>
>>>> ------------------------------
>>>>
>>>> _______________________________________________
>>>> CIG-SHORT mailing list
>>>> CIG-SHORT at geodynamics.org
>>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>>
>>>>
>>>> End of CIG-SHORT Digest, Vol 72, Issue 21
>>>> *****************************************
>>>
>>> _______________________________________________
>>> CIG-SHORT mailing list
>>> CIG-SHORT at geodynamics.org
>>> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>
>>
>>
>>
>> --
>> 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
> -------------- next part --------------
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>
> ------------------------------
>
> _______________________________________________
> CIG-SHORT mailing list
> CIG-SHORT at geodynamics.org
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>
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