OK, this is what I get with bisect:

(base) 06:54 (c3b2925bfb...)|BISECTING ~/Codes/petsc2$ git bisect good
The merge base c3b2925bfbe1c0a0b3a69c9a76295d0747e33d47 is bad.
This means the bug has been fixed between c3b2925bfbe1c0a0b3a69c9a76295d0747e33d47 and [09da24df01e50defd94bc4f7396f866a808ecea5 c3b2925bfbe1c0a0b3a69c9a76295d0747e33d47].

(base) 06:56 (v3.15.1) ~/Codes/petsc2$ git checkout c3b2925bfbe1c0a0b3a69c9a76295d0747e33d47
Previous HEAD position was 09da24df01 Increase patchlevel to 3.15.1
HEAD is now at c3b2925bfb Merge branch 'knepley-main-patch-78504' into 'release'
(base) 06:56 (c3b2925bfb...) ~/Codes/petsc2$

On Wed, Jun 23, 2021 at 11:14 PM Junchao Zhang <junchao.zhang@gmail.com> wrote:

Mark,

  I am not sure what your problem is.  If it is a regression, can you bisect it?

--Junchao Zhang

On Wed, Jun 23, 2021 at 4:04 PM Mark Adams <mfadams@lbl.gov> wrote:

I also tried commenting out the second VecView, so there is just one step in the file, and the .h5 file is only 8 bytes smaller and the .xmf file goes from 5373  bytes to 3090 bytes.

On Wed, Jun 23, 2021 at 4:01 PM Mark Adams <mfadams@lbl.gov> wrote:

It is not a device issue but it is a regression.

Landau ex1 is tiny and just calls VecView before and after the TSsolve, which is one time step. If you add "-dm_view hdf5:f.h5 -vec_view hdf5:f.h5::append -dm_landau_Ez 10." to landau/ex1 (see below), you get an h5 file with two time steps, as it should be. 

This is a huge electric field, Ez=10, which makes the electron distribution (u_e) get visibly pulled off center. 

In Visit, both time steps have identical data that is clearly after the solve and not the initial condition (see attached). 

I ran this again with -ex1_ts_max_steps 0 and get the expected result of two steps/frames with the symmetric initial condition in both. THis is correct behavior.

Any ideas?

Thanks

diff --git a/src/ts/utils/dmplexlandau/tutorials/ex1.c b/src/ts/utils/dmplexlandau/tutorials/ex1.c
index 9e4c8f1b61..31dfda2fad 100644
--- a/src/ts/utils/dmplexlandau/tutorials/ex1.c
+++ b/src/ts/utils/dmplexlandau/tutorials/ex1.c
@@ -66,6 +66,6 @@ int main(int argc, char **argv)
   test:
     suffix: 0
     requires: p4est !complex
-    args: -petscspace_degree 3 -petscspace_poly_tensor 1 -dm_landau_type p4est -dm_landau_ion_masses 2,4 -dm_landau_ion_charges 1,18 -dm_landau_thermal_temps 5,5,.5 -dm_landau_n 1.00018,1,1e-5 -dm_landau_n_0 1e20 -ex1_ts_monitor -ex1_snes_rtol 1.e-14 -ex1_snes_stol 1.e-14 -ex1_snes_monitor -ex1_snes_converged_reason -ex1_ts_type arkimex -ex1_ts_arkimex_type 1bee -ex1_ts_max_snes_failures -1 -ex1_ts_rtol 1e-1 -ex1_ts_dt 1.e-1 -ex1_ts_max_time 1 -ex1_ts_adapt_clip .5,1.25 -ex1_ts_adapt_scale_solve_failed 0.75 -ex1_ts_adapt_time_step_increase_delay 5 -ex1_ts_max_steps 1 -ex1_pc_type lu -ex1_ksp_type preonly -dm_landau_amr_levels_max 7 -dm_landau_domain_radius 5 -dm_landau_amr_re_levels 0 -dm_landau_re_radius 1 -dm_landau_amr_z_refine1 1 -dm_landau_amr_z_refine2 0 -dm_landau_amr_post_refine 0 -dm_landau_z_radius1 .1 -dm_landau_z_radius2 .1 -dm_refine 1 -dm_landau_gpu_assembly false
+    args: -petscspace_degree 3 -petscspace_poly_tensor 1 -dm_landau_type p4est -dm_landau_ion_masses 2,4 -dm_landau_ion_charges 1,18 -dm_landau_thermal_temps 5,5,.5 -dm_landau_n 1.00018,1,1e-5 -dm_landau_n_0 1e20 -ex1_ts_monitor -ex1_snes_rtol 1.e-14 -ex1_snes_stol 1.e-14 -ex1_snes_monitor -ex1_snes_converged_reason -ex1_ts_type arkimex -ex1_ts_arkimex_type 1bee -ex1_ts_max_snes_failures -1 -ex1_ts_rtol 1e-1 -ex1_ts_dt 1.e-1 -ex1_ts_max_time 1 -ex1_ts_adapt_clip .5,1.25 -ex1_ts_adapt_scale_solve_failed 0.75 -ex1_ts_adapt_time_step_increase_delay 5 -ex1_ts_max_steps 1 -ex1_pc_type lu -ex1_ksp_type preonly -dm_landau_amr_levels_max 7 -dm_landau_domain_radius 5 -dm_landau_amr_re_levels 0 -dm_landau_re_radius 1 -dm_landau_amr_z_refine1 1 -dm_landau_amr_z_refine2 0 -dm_landau_amr_post_refine 0 -dm_landau_z_radius1 .1 -dm_landau_z_radius2 .1 -dm_refine 1 -dm_landau_gpu_assembly false -dm_view hdf5:f.h5 -vec_view hdf5:f.h5::append -dm_landau_Ez 10.

 TEST*/

On Wed, Jun 23, 2021 at 1:38 PM Mark Adams <mfadams@lbl.gov> wrote:

Landau ex1 should work. I will test.

On Wed, Jun 23, 2021 at 10:47 AM Matthew Knepley <knepley@gmail.com> wrote:

On Wed, Jun 23, 2021 at 10:44 AM Junchao Zhang <junchao.zhang@gmail.com> wrote:

Use VecGetArrayRead/Write() to get up-to-date host pointers to the vector array.

I think Mark is saying that those are not working. We do call VecGetArrayRead() in the HDF5 code.

Mark, it seem like a small broken code is necessary.

  Thanks,

    Matt

 

--Junchao Zhang

On Wed, Jun 23, 2021 at 9:15 AM Mark Adams <mfadams@lbl.gov> wrote:

First, there seem to be two pages for VecGetArrayAndMemType (one has a pointer to the other).

So I need to get a CPU array for HDF5 viewing. Totally broken for devices.

I don't find a VecGetArrayCpu[HOST] that does the right thing. 

Perhaps have VecGetArrayAndMemType return a valid CPU pointer when "mtype==NULL"?

Mark

--

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

https://www.cse.buffalo.edu/~knepley/