For us it clearly creates problems in real computations...
I understand the need to have clean test for PETSc, but for me, it
reveals that hypre isn't usable with more than one thread for now...
Another solution: force single-threaded configuration for hypre until
this is fixed?
Eric
On 2021-03-13 8:50 a.m., Pierre Jolivet wrote:
-pc_hypre_boomeramg_relax_type_all Jacobi =>
Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 3
-pc_hypre_boomeramg_relax_type_all l1scaled-Jacobi =>
OK, independently of the architecture it seems (Eric Docker image with
1 or 2 threads or my macOS), but contraction factor is higher
Linear solve converged due to CONVERGED_RTOL iterations 8
Linear solve converged due to CONVERGED_RTOL iterations 24
Linear solve converged due to CONVERGED_RTOL iterations 26
v. currently
Linear solve converged due to CONVERGED_RTOL iterations 7
Linear solve converged due to CONVERGED_RTOL iterations 9
Linear solve converged due to CONVERGED_RTOL iterations 10
Do we change this? Or should we force OMP_NUM_THREADS=1 for make test?
Thanks,
Pierre
On 13 Mar 2021, at 2:26 PM, Mark Adams <mfad...@lbl.gov
<mailto:mfad...@lbl.gov>> wrote:
Hypre uses a multiplicative smoother by default. It has a chebyshev
smoother. That with a Jacobi PC should be thread invariant.
Mark
On Sat, Mar 13, 2021 at 8:18 AM Pierre Jolivet <pie...@joliv.et
<mailto:pie...@joliv.et>> wrote:
On 13 Mar 2021, at 9:17 AM, Pierre Jolivet <pie...@joliv.et
<mailto:pie...@joliv.et>> wrote:
Hello Eric,
I’ve made an “interesting” discovery, so I’ll put back the list
in c/c.
It appears the following snippet of code which uses Allreduce()
+ lambda function + MPI_IN_PLACE is:
- Valgrind-clean with MPICH;
- Valgrind-clean with OpenMPI 4.0.5;
- not Valgrind-clean with OpenMPI 4.1.0.
I’m not sure who is to blame here, I’ll need to look at the MPI
specification for what is required by the implementors and users
in that case.
In the meantime, I’ll do the following:
- update config/BuildSystem/config/packages/OpenMPI.py to use
OpenMPI 4.1.0, see if any other error appears;
- provide a hotfix to bypass the segfaults;
I can confirm that splitting the single Allreduce with my own
MPI_Op into two Allreduce with MAX and BAND fixes the segfaults
with OpenMPI (*).
- look at the hypre issue and whether they should be deferred to
the hypre team.
I don’t know if there is something wrong in hypre threading or if
it’s just a side effect of threading, but it seems that the
number of threads has a drastic effect on the quality of the PC.
By default, it looks that there are two threads per process with
your Docker image.
If I force OMP_NUM_THREADS=1, then I get the same convergence as
in the output file.
Thanks,
Pierre
(*) https://gitlab.com/petsc/petsc/-/merge_requests/3712
<https://gitlab.com/petsc/petsc/-/merge_requests/3712>
Thank you for the Docker files, they were really useful.
If you want to avoid oversubscription failures, you can edit the
file /opt/openmpi-4.1.0/etc/openmpi-default-hostfile and append
the line:
localhost slots=12
If you want to increase the timeout limit of PETSc test suite
for each test, you can add the extra flag in your command line
TIMEOUT=180 (default is 60, units are seconds).
Thanks, I’ll ping you on GitLab when I’ve got something ready
for you to try,
Pierre
<ompi.cxx>
On 12 Mar 2021, at 8:54 PM, Eric Chamberland
<eric.chamberl...@giref.ulaval.ca
<mailto:eric.chamberl...@giref.ulaval.ca>> wrote:
Hi Pierre,
I now have a docker container reproducing the problems here.
Actually, if I look at snes_tutorials-ex12_quad_singular_hpddm
it fails like this:
not ok snes_tutorials-ex12_quad_singular_hpddm # Error code: 59
# Initial guess
# L_2 Error: 0.00803099
# Initial Residual
# L_2 Residual: 1.09057
# Au - b = Au + F(0)
# Linear L_2 Residual: 1.09057
# [d470c54ce086:14127] Read -1, expected 4096, errno = 1
# [d470c54ce086:14128] Read -1, expected 4096, errno = 1
# [d470c54ce086:14129] Read -1, expected 4096, errno = 1
# [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
https://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
<https://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind>
# [3]PETSC ERROR: or try http://valgrind.org
<http://valgrind.org/> on GNU/linux and Apple Mac OS X to find
memory corruption errors
# [3]PETSC ERROR: likely location of problem given in
stack below
# [3]PETSC ERROR: --------------------- Stack Frames
------------------------------------
# [3]PETSC ERROR: Note: The EXACT line numbers in the
stack are not available,
# [3]PETSC ERROR: INSTEAD the line number of the start of
the function
# [3]PETSC ERROR: is given.
# [3]PETSC ERROR: [3] buildTwo line 987
/opt/petsc-main/include/HPDDM_schwarz.hpp
# [3]PETSC ERROR: [3] next line 1130
/opt/petsc-main/include/HPDDM_schwarz.hpp
# [3]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
# [3]PETSC ERROR: Signal received
# [3]PETSC ERROR: [0]PETSC ERROR:
------------------------------------------------------------------------
also ex12_quad_hpddm_reuse_baij fails with a lot more "Read -1,
expected ..." which I don't know where they come from...?
Hypre (like in diff-snes_tutorials-ex56_hypre) is also having
DIVERGED_INDEFINITE_PC failures...
Please see the 3 attached docker files:
1) fedora_mkl_and_devtools : the DockerFile which install
fedore 33 with gnu compilers and MKL and everything to develop.
2) openmpi: the DockerFile to bluid OpenMPI
3) petsc: The las DockerFile that build/install and test PETSc
I build the 3 like this:
docker build -t fedora_mkl_and_devtools -f
fedora_mkl_and_devtools .
docker build -t openmpi -f openmpi .
docker build -t petsc -f petsc .
Disclaimer: I am not a docker expert, so I may do things that
are not docker-stat-of-the-art but I am opened to suggestions... ;)
I have just ran it on my portable (long) which have not enough
cores, so many more tests failed (should force --oversubscribe
but don't know how to). I will relaunch on my workstation in a
few minutes.
I will now test your branch! (sorry for the delay).
Thanks,
Eric
On 2021-03-11 9:03 a.m., Eric Chamberland wrote:
Hi Pierre,
ok, that's interesting!
I will try to build a docker image until tomorrow and give you
the exact recipe to reproduce the bugs.
Eric
On 2021-03-11 2:46 a.m., Pierre Jolivet wrote:
On 11 Mar 2021, at 6:16 AM, Barry Smith <bsm...@petsc.dev
<mailto:bsm...@petsc.dev>> wrote:
Eric,
Sorry about not being more immediate. We still have this
in our active email so you don't need to submit individual
issues. We'll try to get to them as soon as we can.
Indeed, I’m still trying to figure this out.
I realized that some of my configure flags were different
than yours, e.g., no --with-memalign.
I’ve also added SuperLU_DIST to my installation.
Still, I can’t reproduce any issue.
I will continue looking into this, it appears I’m seeing some
valgrind errors, but I don’t know if this is some side effect
of OpenMPI not being valgrind-clean (last time I checked,
there was no error with MPICH).
Thank you for your patience,
Pierre
/usr/bin/gmake -f gmakefile test test-fail=1
Using MAKEFLAGS: test-fail=1
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex12_quad_hpddm_reuse_baij.counts
ok snes_tutorials-ex12_quad_hpddm_reuse_baij
ok diff-snes_tutorials-ex12_quad_hpddm_reuse_baij
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tests-ex33_superlu_dist_2.counts
ok ksp_ksp_tests-ex33_superlu_dist_2
ok diff-ksp_ksp_tests-ex33_superlu_dist_2
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tests-ex49_superlu_dist.counts
ok ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-0_conv-0
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-0_conv-0
ok ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-0_conv-1
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-0_conv-1
ok ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-1_conv-0
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-1_conv-0
ok ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-1_conv-1
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-1herm-1_conv-1
ok ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-0_conv-0
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-0_conv-0
ok ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-0_conv-1
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-0_conv-1
ok ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-1_conv-0
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-1_conv-0
ok ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-1_conv-1
ok diff-ksp_ksp_tests-ex49_superlu_dist+nsize-4herm-1_conv-1
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex50_tut_2.counts
ok ksp_ksp_tutorials-ex50_tut_2
ok diff-ksp_ksp_tutorials-ex50_tut_2
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tests-ex33_superlu_dist.counts
ok ksp_ksp_tests-ex33_superlu_dist
ok diff-ksp_ksp_tests-ex33_superlu_dist
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex56_hypre.counts
ok snes_tutorials-ex56_hypre
ok diff-snes_tutorials-ex56_hypre
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex56_2.counts
ok ksp_ksp_tutorials-ex56_2
ok diff-ksp_ksp_tutorials-ex56_2
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex17_3d_q3_trig_elas.counts
ok snes_tutorials-ex17_3d_q3_trig_elas
ok diff-snes_tutorials-ex17_3d_q3_trig_elas
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex12_quad_hpddm_reuse_threshold_baij.counts
ok snes_tutorials-ex12_quad_hpddm_reuse_threshold_baij
ok diff-snes_tutorials-ex12_quad_hpddm_reuse_threshold_baij
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5_superlu_dist_3.counts
not ok ksp_ksp_tutorials-ex5_superlu_dist_3 # Error code: 1
#srun: error: Unable to create step for job 1426755: More
processors requested than permitted
ok ksp_ksp_tutorials-ex5_superlu_dist_3 # SKIP Command
failed so no diff
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5f_superlu_dist.counts
ok ksp_ksp_tutorials-ex5f_superlu_dist # SKIP Fortran
required for this test
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex12_tri_parmetis_hpddm_baij.counts
ok snes_tutorials-ex12_tri_parmetis_hpddm_baij
ok diff-snes_tutorials-ex12_tri_parmetis_hpddm_baij
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex19_tut_3.counts
ok snes_tutorials-ex19_tut_3
ok diff-snes_tutorials-ex19_tut_3
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex17_3d_q3_trig_vlap.counts
ok snes_tutorials-ex17_3d_q3_trig_vlap
ok diff-snes_tutorials-ex17_3d_q3_trig_vlap
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5f_superlu_dist_3.counts
ok ksp_ksp_tutorials-ex5f_superlu_dist_3 # SKIP Fortran
required for this test
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex19_superlu_dist.counts
ok snes_tutorials-ex19_superlu_dist
ok diff-snes_tutorials-ex19_superlu_dist
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex56_attach_mat_nearnullspace-1_bddc_approx_hypre.counts
ok
snes_tutorials-ex56_attach_mat_nearnullspace-1_bddc_approx_hypre
ok
diff-snes_tutorials-ex56_attach_mat_nearnullspace-1_bddc_approx_hypre
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex49_hypre_nullspace.counts
ok ksp_ksp_tutorials-ex49_hypre_nullspace
ok diff-ksp_ksp_tutorials-ex49_hypre_nullspace
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex19_superlu_dist_2.counts
ok snes_tutorials-ex19_superlu_dist_2
ok diff-snes_tutorials-ex19_superlu_dist_2
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5_superlu_dist_2.counts
not ok ksp_ksp_tutorials-ex5_superlu_dist_2 # Error code: 1
#srun: error: Unable to create step for job 1426755: More
processors requested than permitted
ok ksp_ksp_tutorials-ex5_superlu_dist_2 # SKIP Command
failed so no diff
TEST
arch-linux2-c-opt-ompi/tests/counts/snes_tutorials-ex56_attach_mat_nearnullspace-0_bddc_approx_hypre.counts
ok
snes_tutorials-ex56_attach_mat_nearnullspace-0_bddc_approx_hypre
ok
diff-snes_tutorials-ex56_attach_mat_nearnullspace-0_bddc_approx_hypre
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex64_1.counts
ok ksp_ksp_tutorials-ex64_1
ok diff-ksp_ksp_tutorials-ex64_1
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5_superlu_dist.counts
not ok ksp_ksp_tutorials-ex5_superlu_dist # Error code: 1
#srun: error: Unable to create step for job 1426755: More
processors requested than permitted
ok ksp_ksp_tutorials-ex5_superlu_dist # SKIP Command failed
so no diff
TEST
arch-linux2-c-opt-ompi/tests/counts/ksp_ksp_tutorials-ex5f_superlu_dist_2.counts
ok ksp_ksp_tutorials-ex5f_superlu_dist_2 # SKIP Fortran
required for this test
Barry
On Mar 10, 2021, at 11:03 PM, Eric Chamberland
<eric.chamberl...@giref.ulaval.ca
<mailto:eric.chamberl...@giref.ulaval.ca>> wrote:
Barry,
to get a some follow up on --with-openmp=1 failures, shall
I open gitlab issues for:
a) all hypre failures giving DIVERGED_INDEFINITE_PC
b) all superlu_dist failures giving different results with
initia and "Exceeded timeout limit of 60 s"
c) hpddm failures "free(): invalid next size (fast)" and
"Segmentation Violation"
d) all tao's "Exceeded timeout limit of 60 s"
I don't see how I could do all these debugging by myself...
Thanks,
Eric
--
Eric Chamberland, ing., M. Ing
Professionnel de recherche
GIREF/Université Laval
(418) 656-2131 poste 41 22 42
--
Eric Chamberland, ing., M. Ing
Professionnel de recherche
GIREF/Université Laval
(418) 656-2131 poste 41 22 42
<fedora_mkl_and_devtools.txt><openmpi.txt><petsc.txt>
--
Eric Chamberland, ing., M. Ing
Professionnel de recherche
GIREF/Université Laval
(418) 656-2131 poste 41 22 42
