On Wed, Mar 11, 2015 at 3:39 PM, Song Gao <[email protected]> wrote:
> Thanks. > > I run with two processes. When the code stop, I'm in raise() and > alpha is not in the current context. > Here you would use: (gdb) up 4 (gdb) p *alpha Matt > (gdb)p alpha > No symbol "alpha" in current context. > (gdb) bt > #0 0x0000003764432625 in raise () from /lib64/libc.so.6 > #1 0x0000003764433e05 in abort () from /lib64/libc.so.6 > #2 0x00000000015d02f5 in PetscAbortErrorHandler (comm=0x36e17a0, > line=1186, > fun=0x279cad4 "VecMAXPY", file=0x279c404 "rvector.c", > dir=0x279c1c8 "src/vec/vec/interface/", n=62, p=PETSC_ERROR_INITIAL, > mess=0x7fff33ffa4c0 "Scalar value must be same on all processes, > argument # 3", ctx=0x0) at errabort.c:62 > #3 0x000000000130cf44 in PetscError (comm=0x36e17a0, line=1186, > func=0x279cad4 "VecMAXPY", file=0x279c404 "rvector.c", > dir=0x279c1c8 "src/vec/vec/interface/", n=62, p=PETSC_ERROR_INITIAL, > mess=0x279c720 "Scalar value must be same on all processes, argument # > %d") > at err.c:356 > #4 0x00000000013f8184 in VecMAXPY (y=0x3b35000, nv=20, alpha=0x3b31840, > x=0x3b33080) at rvector.c:1186 > #5 0x0000000001581062 in KSPGMRESBuildSoln (nrs=0x3b31840, vs=0x3ab2090, > vdest=0x3ab2090, ksp=0x39a9700, it=19) at gmres.c:345 > > > But I break at VecMAXPY. then print out alpha on both processes. For the > first few times that the breakpoint is hit , I checked the values on both > processes and they are the same. > > > (gdb) b VecMAXPY > Breakpoint 1 at 0x13f73e0: file rvector.c, line 1174. > (gdb) c > Continuing. > Breakpoint 1, VecMAXPY (y=0x3f2b790, nv=1, alpha=0x3f374e0, x=0x3f1fde0) > at rvector.c:1174 > 1174 PetscFunctionBegin; > (gdb) p alpha > $1 = (const PetscScalar *) 0x3f374e0 > (gdb) p *alpha > $2 = -0.54285016977140765 > (gdb) > > 2015-03-11 15:52 GMT-04:00 Matthew Knepley <[email protected]>: > >> On Wed, Mar 11, 2015 at 2:33 PM, Song Gao <[email protected]> >> wrote: >> >>> Hello, >>> >>> I'm solving Navier-Stokes equations by finite element method. I use KSP >>> as the linear system solver. I run with 2 cpu. The code runs fine in >>> non-debug version. But when I switch to the debug version, the code gives >>> the following error. >>> >>> I output the matrix and rhs before calling KSPSolve to make sure no NAN >>> or INF in them. The condition number of matrix is ~2e4. Seems okay. >>> >>> I also run the code with valgrind, but didn't find any other errors. The >>> valgrind output is attached. Any ideas of what I can do next? >>> >> >> Is there any chance you could spawn the debugger, -start_in_debugger, and >> when you get the error, >> print out the value of 'alpha' on each process? >> >> Otherwise the best thing to do is output your Mat and RHS in binary and >> send them so we can try to reproduce. >> >> Matt >> >> Thanks, >> >> Matt >> >> >>> Thanks in advance. >>> >>> >>> [0]PETSC ERROR: --------------------- Error Message >>> ------------------------------------ >>> [0]PETSC ERROR: Invalid argument! >>> [0]PETSC ERROR: Scalar value must be same on all processes, argument # 3! >>> [0]PETSC ERROR: >>> ------------------------------------------------------------------------ >>> [0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 7, Sat May 11 >>> 22:15:24 CDT 2013 >>> [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: >>> /home/cfd/sgao/mycodes/fensap_new_edge_coefficient/fensapng-mf-newmuscl-overledg_org/bin/fensapMPI_LINUX64_DEBUG >>> on a linux named anakin by sgao Wed Mar 11 15:07:53 2015 >>> [0]PETSC ERROR: Libraries linked from /tmp/PETSC33/petsc-3.3-p7/linux/lib >>> [0]PETSC ERROR: Configure run at Wed Jan 15 12:04:54 2014 >>> [0]PETSC ERROR: Configure options >>> --with-mpi-dir=/usr/local.linux64/lib64/MPI-openmpi-1.4.5/ >>> --with-shared-libraries=0 --COPTFLAGS=-g --FOPTFLAGS=-g --with-debugging=yes >>> [0]PETSC ERROR: >>> ------------------------------------------------------------------------ >>> [0]PETSC ERROR: VecMAXPY() line 1186 in src/vec/vec/interface/rvector.c >>> [0]PETSC ERROR: KSPGMRESBuildSoln() line 345 in >>> src/ksp/ksp/impls/gmres/gmres.c >>> [0]PETSC ERROR: KSPGMRESCycle() line 206 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 >>> >>> >> >> >> -- >> 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
