Hi,
I tried valgrind in MPI but it aborts very early, with the error msg
regarding PETSc initialize.
I retry again, using a lower resolution.
GAMG works, but BoomerAMG and hypre doesn't. Increasing cpu too high
(80) also cause it to hang. 60 works fine.
My grid size is 98x169x169
But when I increase the resolution, GAMG can't work again.
I tried to increase the cpu no but it still doesn't work.
Previously, using single z direction partition, it work using GAMG and
hypre. So what could be the problem?
Thank you.
Yours sincerely,
TAY wee-beng
On 25/12/2015 12:33 AM, Matthew Knepley wrote:
It sounds like you have memory corruption in a different part of the
code. Run in valgrind.
Matt
On Thu, Dec 24, 2015 at 10:14 AM, TAY wee-beng <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I have this strange error. I converted my CFD code from a z
directon only partition to the yz direction partition. The code
works fine but when I increase the cpu no, strange things happen
when solving the Poisson eqn.
I increase cpu no from 24 to 40.
Sometimes it works, sometimes it doesn't. When it doesn't, it just
hangs there with no output, or it gives the error below:
Using MPI_Barrier during debug shows that it hangs at
call KSPSolve(ksp,b_rhs,xx,ierr).
I use hypre BoomerAMG and GAMG (-poisson_pc_gamg_agg_nsmooths 1
-poisson_pc_type gamg)
Why is this so random? Also how do I debug this type of problem.
[32]PETSC ERROR:
------------------------------------------------------------------------
[32]PETSC ERROR: Caught signal number 11 SEGV: Segmentation
Violation, probably memory access out of range
[32]PETSC ERROR: Try option -start_in_debugger or
-on_error_attach_debugger
[32]PETSC ERROR: or see
http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
[32]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple
Mac OS X to find memory corruption errors
[32]PETSC ERROR: likely location of problem given in stack below
[32]PETSC ERROR: --------------------- Stack Frames
------------------------------------
[32]PETSC ERROR: Note: The EXACT line numbers in the stack are not
available,
[32]PETSC ERROR: INSTEAD the line number of the start of the
function
[32]PETSC ERROR: is given.
[32]PETSC ERROR: [32] HYPRE_SetupXXX line 174
/home/wtay/Codes/petsc-3.6.2/src/ksp/pc/impls/hypre/hypre.c
[32]PETSC ERROR: [32] PCSetUp_HYPRE line 122
/home/wtay/Codes/petsc-3.6.2/src/ksp/pc/impls/hypre/hypre.c
[32]PETSC ERROR: [32] PCSetUp line 945
/home/wtay/Codes/petsc-3.6.2/src/ksp/pc/interface/precon.c
[32]PETSC ERROR: [32] KSPSetUp line 247
/home/wtay/Codes/petsc-3.6.2/src/ksp/ksp/interface/itfunc.c
[32]PETSC ERROR: [32] KSPSolve line 510
/home/wtay/Codes/petsc-3.6.2/src/ksp/ksp/interface/itfunc.c
[32]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[32]PETSC ERROR: Signal received
[32]PETSC ERROR: See
http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble
shooting.
[32]PETSC ERROR: Petsc Release Version 3.6.2, Oct, 02, 2015
[32]PETSC ERROR: ./a.out on a petsc-3.6.2_shared_gnu_debug named
n12-40 by wtay Thu Dec 24 17:01:51 2015
[32]PETSC ERROR: Configure options
--with-mpi-dir=/opt/ud/openmpi-1.8.8/ --download-fblaslapack=1
--with-debugging=1 --download-hypre=1
--prefix=/home/wtay/Lib/petsc-3.6.2_shared_gnu_debug
--known-mpi-shared=1 --with-shared-libraries
--with-fortran-interfaces=1
[32]PETSC ERROR: #1 User provided function() line 0 in unknown file
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 32 in communicator MPI_COMM_WORLD
with errorcode 59.
--
Thank you.
Yours sincerely,
TAY wee-beng
--
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
