-shared=0
--with-shared=0 --with-blas-lapack-dir=/opt/intel/cmkl/10.0.5.025/lib/em64t
However, if I use back MKL 8.1.1, with similar command, then there's no
such problem.
Hope you can help. Thanks!
--
Yours sincerely,
Ben Tay
Hi,
I'm thinking of using the example code ex2f to determine my school
server's MPI performance. Since my own code uses a 1200x1080 grid, I let
m and n in ex2f.F be equal to 1200 and 1080 respectively. I ran the code
on 4 processors and found that it's taking a very long time to complete
for
from 4 to 8 processes,
this is why you do not see such a great speedup.
Barry
On Jun 6, 2008, at 8:07 PM, Ben Tay wrote:
Hi,
I have coded in parallel using PETSc and Hypre. I found that going
from 1 to 4 processors gives an almost 4 times increase. However from
4 to 8 processors only
Ya Thank you Barry. I also realised it.
Barry Smith wrote:
You use KSPGetPC(ksp_uv,pc_uv,ierr) but call PCSetType(pc,'hypre',ierr)
this is why you should ALWAYS, always use implicit none
Barry
On Jun 9, 2008, at 9:46 PM, Ben Tay wrote:
Hi,
I tried to use BoomerAMG
Hi,
I have coded in parallel using PETSc and Hypre. I found that going from
1 to 4 processors gives an almost 4 times increase. However from 4 to 8
processors only increase performance by 1.2-1.5 instead of 2.
Is the slowdown due to the size of the matrix being not large enough?
Currently I
Hi,
(I sent this email a while ago but I use a different email address. Not
sure if it got through since it's not registered in the server list.
Sorry if it was resent.)
I obtain 2 linear eqns (u and v velocity) from the momentum eqn in my
CFD code. Instead of solving eqn 1 in parallel, and
)
call PetscViewerDestroy(viewer,ierr)
On May 27, 2008, at 5:57 AM, Ben Tay wrote:
Hi Barry,
Thanks for pointing out. However, I only got a 0 byte file after
adding the include statement.
I am programming in parallel and my matrix is created using
MatCreateMPIAIJ. Did I missed out some
Hi,
I read in the manual that I can use either call
MatSetOption(A_mat_uv,MAT_NO_NEW_NONZERO_LOCATIONS,PETSC_TRUE,ierr) or
call MatSetOption(A_mat,MAT_SYMMETRIC,PETSC_TRUE,ierr).
When I use MAT_NO_NEW_NONZERO_LOCATIONS for the matrix formed by my
momentum eqn, I get the error on my home
this stuff.
On May 25, 2008, at 5:43 AM, Ben Tay wrote:
Hi,
I have an old serial code and a newer parallel code. The new parallel
code is converted from the old serial code. However, due to numerous
changes, the answers from the new code now differs from the old one
after the 1st step. What
Hi,
I have an old serial code and a newer parallel code. The new parallel
code is converted from the old serial code. However, due to numerous
changes, the answers from the new code now differs from the old one
after the 1st step. What is the best way to compare the matrices from
the 2
as the matrix, not A.
I don't know if this approach is efficient or not. Can anybody comment?
Thanks,
Sean
On May 9, 2008, at 2:33 PM, Ben Tay wrote:
Hi,
I have a matrix and I inserted all the relevant values during the 1st
step. I'll then solve it. For the subsequent steps, I only need
Hi,
I'm trying to run my mpi code on the MS Compute cluster which my school
just installed. Unfortunately, it failed without giving any error msg. I
am using just a test example ex2f.
I read in the MS website that there is no need to use MS MPI to compile
the code or library.
Anyway, I also
. Sorry abt that.
Thank you very much.
Satish Balay wrote:
On Sat, 19 Apr 2008, Ben Tay wrote:
Btw, I'm not able to try the latest mpich2 because I do not have the
administrator rights. I was told that some special configuration is
required.
You don't need admin rights
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a huge number of off-process values in the matrix
(see MatAssemblyBegin). Is this true? I would reorganize this part.
Matt
On Tue, Apr 15, 2008 at 10:33 AM, Ben Tay zonexo at gmail.com wrote:
Hi,
I have converted the poisson eqn part of the CFD code to parallel. The grid
size
.
Barry
On Apr 15, 2008, at 10:56 AM, Ben Tay wrote:
Oh sorry here's the whole information. I'm using 2 processors currently:
*** WIDEN YOUR WINDOW TO 120
Hi,
I was initially using LU and Hypre to solve my serial code. I switched
to the default GMRES when I converted the parallel code. I've now redo
the test using KSPBCGS and also Hypre BommerAMG. Seems like
MatAssemblyBegin, VecAYPX, VecScatterEnd (in bold) are the problems.
What should I be
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, 2008 at 4:12 AM, Ben Tay zonexo at gmail.com wrote:
Hi,
I've a serial 2D CFD code. As my grid size requirement increases, the
simulation takes longer. Also, memory requirement becomes a problem. Grid
size 've reached 1200x1200. Going higher is not possible due to memory
problem.
I tried
structures (like Mat and Vec) using a binary viewer.
Then run in parallel with the same code, which will output the same
structures. Take the two files and write a small verification code that
loads both versions and calls MatEqual and VecEqual.
Matt
On Mon, Apr 14, 2008 at 5:49 AM, Ben Tay
Hi,
I've a serial 2D CFD code. As my grid size requirement increases, the
simulation takes longer. Also, memory requirement becomes a problem. Grid
size 've reached 1200x1200. Going higher is not possible due to memory
problem.
I tried to convert my code to a parallel one, following the examples
and it worked last time. I
wonder what other additions must I install?
Thank you.
Matthew Knepley wrote:
On Mon, Mar 24, 2008 at 8:57 PM, Ben Tay zonexo at gmail.com wrote:
Hmm,
Tried to reinstall Python but it still can't work. Any other idea?
In order to install you must get
_GLOBAL_DATA_mp_ALLO_VAR
Looks like this code is compiled by Compaq Fortran compiler - and not
intel fortran. Can you verify?
Satish
On Sun, 23 Mar 2008, Ben Tay wrote:
Hi,
I've successfully compiled the library of PETSc. The examples also worked (I
tested ex1f). However in the IDE
Hi,
I've successfully compiled the library of PETSc. The examples also
worked (I tested ex1f). However in the IDE of visual studio 2003, I
can't seem to link, although compiling the individual files were fine.
The errors are:
global.obj error LNK2019: unresolved external symbol
Ya, Lisandro, it's my mistake. It is indeed SPD. Thank you for your
reminder!
Lisandro Dalcin wrote:
On 2/6/08, Ben Tay zonexo at gmail.com wrote:
Because my grid's are
non-uniform in both x,y directions. Shouldn't that result in a
non-symmetric matrix? But I think it's still PD
wonder if that is true? If that's the case, then it's not
possible for me to use it, although it's a constant coefficient Poisson
operator with Neumann or Dirchelet boundary conditions.
thank you.
Barry Smith wrote:
On Feb 5, 2008, at 8:04 PM, Ben Tay wrote:
Hi Lisandro,
I'm using
, Ben Tay wrote:
Thank you Barry for your enlightenment. I'll just continue to use
BoomerAMG for the poisson eqn. I'll also check up on FFTW. Last time,
I recalled that there seemed to be some restrictions for FFT on
solving poisson eqn. It seems that the grids must be constant in at
least 1
Hi,
I'm thinking of ways to estimate and compare the performance of PETSc on
different CPUs. I think it will also enable one to make the wise choice
of whether to upgrade or not.
Of cos, the best way is to run your own code on the new machine to see
how much increase there is. However, most
Hi,
someone was talking abt core 2 duo performance on os x in some previous
email. it seems that due to memory issues, it's not possible to get 2x the
performance. there's also some mention of amd vs intel dual core.
for computation using PETSc, is there any reason to buy one instead of the
Thanks Zhang Hong!
I've got it working.
Hong Zhang wrote:
See ~petsc/src/mat/examples/tests/ex58f.F on
how to use MatGetRow() from Fortran.
Hong
On Mon, 27 Aug 2007, Ben Tay wrote:
Hi,
I'm trying to view a particular row of a matrix. This 's what I do in my
loops:
real(8
Hi,
May I know if there's a routine which can convert a matrix initially
created using MatCreateSeqAIJ to compressed row format (CSR) ? Then I
would like to view it in my visual fortran debugger. In other words, the
matrix is in standard array format, not Mat.
Thanks
Hi,
when KSPSolve is called, I got the following errors:
Detected zero pivot in LU factorization
Empty row in matrix!
There's definitely some errors in the code, but I just can't detect it.
PETSc does not tell me which row. How can I find out? Btw, I'm working
in visual fortran
Thank you
-2.3.3-p4/src/ksp/ksp/examples/tutorials
$
On Thu, 23 Aug 2007, Ben Tay wrote:
Hi,
I got this error while trying to compile the test example in
src/ksp/ksp/example/tutorials/ex1f
/codes/petsc-2.3.3-p4/bin/win32fe/win32fe f90 -c -threads -debug:full
-fpp:-m
-I/codes/petsc-2.3.3-p4
Hi,
I got this error while trying to compile the test example in
src/ksp/ksp/example/tutorials/ex1f
/codes/petsc-2.3.3-p4/bin/win32fe/win32fe f90 -c -threads -debug:full
-fpp:-m
-I/codes/petsc-2.3.3-p4 -I/codes/petsc-2.3.3-p4/bmake/win32
-I/codes/petsc-2.3.3
-p4/include
it
lower?
Thank you.
Hong Zhang wrote:
On Thu, 16 Aug 2007, Ben Tay wrote:
Btw, is the file to download
ftp://ftp.mcs.anl.gov/pub/petsc/externalpackages/ml-5.0.tar.gz?
Yes. You can simply use '--download-ml=1' during configuration.
Run your program with '-help' to see all
also get the error msg:
*ML*WRN* This function has been compiled without the configure
*ML*WRN* option --with-ml_metis
*ML*WRN* I will put all the nodes in the same aggregate, this time...
*ML*WRN* (file ./Coarsen/ml_agg_METIS.c, line 954)
Thanks
Barry Smith wrote:
On Fri, 17 Aug 2007, Ben Tay
Hi,
I found that there's a multigrid option in the manual which can be used
by adding -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE.
However, it seems that I am actually just using LU since with or without
this option, I got exactly the same answer. Am I using multigrid the
wrong way?
Thanks
. Or if you have a
structured grid, consider using DMMG.
Thanks,
Matt
On 8/15/07, Ben Tay zonexo at gmail.com wrote:
Hi,
I found that there's a multigrid option in the manual which can be used
by adding -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE.
However, it seems that I am
using DMMG.
Thanks,
Matt
On 8/15/07, Ben Tay zonexo at gmail.com wrote:
Hi,
I found that there's a multigrid option in the manual which can be used
by adding -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE.
However, it seems that I am actually just using LU since with or without
to the constructor are using 0-offset numbering?
I suspect that it would be 1-offset for both ia_spar and ja_spar which would
cause problems.
Matt
On 8/14/07, Ben Tay zonexo at gmail.com wrote:
Hi,
I am currently using the following way to solve my poisson eqn
in global.F (global variables
Well, I did call MatDestroy, but that's at the very last step when
everything's over. It's ok. I'll give to figure out where the problem
occurs.
Thanks
Matthew Knepley wrote:
On 8/14/07, Ben Tay zonexo at gmail.com wrote:
Oh, I will check up valgrind since I've not used it b4
Hi,
I am currently using the following way to solve my poisson eqn
in global.F (global variables)
implicit none
save
MatA_mat
Vecxx,b_rhs
KSP ksp
PCpc
PCType ptype
KSPTypeksptype
then they are initialized
call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
call
can comiile locally.
Satish
On Thu, 9 Aug 2007, Ben Tay wrote:
Hi Satish,
I am sorry if I have made you angry. I may have missed out some important
points which you tried to highlight. I was converting several of my .F fixed
format files to .f90 (or .F90) free format and some files
2007, Ben Tay wrote:
Thank you Satish. I followed what you recommended exactly and used
sed -e 's/^C/\!/g'
With the new mpif.h, I got the following error:
global.i90
d:\cygwin\codes\MPICH\SDK\include\mpif.h(174) : Error: DEC$ ATTRIBUTES
DLLIMPORT attribute can appear only
Hi,
when I changed my global.F to global.f90, I was told that
PETSC_COMM_SELF, PETSC_NULL_INTEGER and PETSC_NULL_CHARACTER does not
have a type.
I declare
MPI_Comm PETSC_COMM_SELF and it works
So, what about the other 2? You mention to use
integer NORM_MAX
parameter NORM_MAX=3
What values
Hi,
My original matrix is stored in Ellpack-Itpack format, which is used by
the NSPCG solver. I have problems when I insert the values of the matrix
into a PETSc matrix. I guessed I made some mistakes but I can't find
where during debugging. So I intent to just convert from the
Ellpack-Itpack
a type, and must have an explicit
type. [PETSC_NULL_CHARACTER]. Same for PETSC_NULL_INTEGER and
PETSC_COMM_SELF.
It was ok when I'm programming in fixed format.
Thanks
Satish Balay wrote:
On Thu, 9 Aug 2007, Ben Tay wrote:
Hi,
when I changed my global.F to global.f90,
Any
, everything's ok. You can give it a try too.
Lastly, I understand that you have been helping a lot of users and
there's really a lot of stupid users around (I know I'm one of them ;-)
). Thank you for your patience.
Satish Balay wrote:
On Thu, 9 Aug 2007, Ben Tay wrote:
Hi,
Guess I'm
variable declarations (in case you use a
PETSc type variable).
Good Luck,
Paul
Ben Tay wrote:
Hi,
I can compile and run with visual fortran by putting all the
declarations inside a subroutine e.g.
module ada
...
subroutine ddd
#define PETSC_AVOID_DECLARATIONS
#include
be removed
from here..
other includes
#undef PETSC_AVOID_DECLARATIONS
moudle foobar
other module stuff
end module
Satish
On Mon, 6 Aug 2007, Ben Tay wrote:
Hi,
I tried to use
#define PETSC_AVOID_DECLARATIONS
#include include/finclude/petsc.h
other includes
#undef
right?
Any other suggestion?
Thanks.
Barry Smith wrote:
Run with -ksp_type gmres -pc_type lu -ksp_monitor_true_residual
-ksp_truemonitor
At the bad iteration verify if the true residual is very small.
Barry
On Sun, 5 Aug 2007, Ben Tay wrote:
Well, ya, they're the same
Hi,
I've no problem writing out codes in fortran fixed format with PETSc.
However, is it possible to do it in fortran free format as well?
I'm using visual fortran and there's error.
original :
test.F
module global_data
implicit none
save
#include include/finclude/petsc.h
#include
subroutine xyz()
use foobar
implicit none
#include include/finclude/petsc.h
other includes
code
end subroutine
Satish
On Mon, 6 Aug 2007, Ben Tay wrote:
Hi,
I've no problem writing out codes in fortran fixed format with PETSc.
However,
is it possible to do it in fortran free
Hi,
I am trying to insert values into a matrix. I used to use INSERT_VALUES
with MatSetValues or MatSetValue. However, since I need to add values to
the same II,JJ location more than 1 time, I have to use ADD_VALUES with
MatSetValues.
However I got this error message:
Object is in wrong
converging. Run with
-ksp_converged_reason and or -ksp_monitor. My guess is that the matrix is
becoming very ill-conditioned so the solvers with the default options are
failing.
Barry
On Fri, 3 Aug 2007, Ben Tay wrote:
Hi,
I used 2 packages to solve my poisson eqn, which is part
2007, Ben Tay wrote:
Hi,
I realised that the matrix storage format of NSPCG is actually ITPACK storage
format. Anyway, I tried to insert the values into a PETSc matrix, use MatAXPY
with the scalar a = -1 and then use MatNorm on the output matrix.
Using NORM_1, NORM_FROBENIUS
Hi,
I used 2 packages to solve my poisson eqn, which is part of my NS
unsteady solver. One is the NSPCG solver package which uses the
compressed row format to store the A matrix. The other is PETSc. I found
that using both solvers gave me similar answers for a number of time
step. However,
Hi,
I am trying to solve a pressure poisson eqn resulting from the NS eqn.
How can I fixed the pressure at some nodes while solving the poisson eqn?
I tried to make the coefficient of the diagonal location of the node
very big e.g. 1e100. I also use
call
Hi,
I'm formulating a NS solver which computes the flow past an airfoil. The
airfoil has a c-grid and it overlaps with the background cartesian grid. In
other words, it is a chimera or overset grid application.
The boundary cells of the c-grid are connected to the cartesian grid thru
Hi,
I am also trying to solve the NS eqns in 2d, finite volume mtd, using
fractional step formulation.
I am currently using KSPBCGS and PCILU to solve the momentum eqn matrix
and HYPRE's AMG and the default ksptype to solve the poisson eqn. Do you
ppl think this is a good choice? Or is there
Is the matrix symmetric? Do you expect/want it to be symmetric?
Barry
On Mon, 18 Jun 2007, Ben Tay wrote:
Oh btw, here's the output when KSPSetTolerances = 1.0e-5.
1:
0 KSP preconditioned resid norm 5.509130713952e+01 true resid norm
3.411770553001e+01 ||Ae||/||Ax
= 1.0e-8
Thanks again
On 6/17/07, Barry Smith bsmith at mcs.anl.gov wrote:
Ben,
On Sat, 16 Jun 2007, Ben Tay wrote:
Hi,
I am trying to use PETSc to solve my poisson eqn. In the past, when I'm
not
using MPI, I set KSPSetTolerances to 1.0e-5. This seems to be good
enuff.
Now, I'm
Hi,
I am doing CFD and at each time step, I need to interpolate values at
different points. I'm doing bi-quadratic interpolation and hence to get each
interpolated value, I need to solve a 9x9 matrices. There's about 100+ pts
and hence 100+ 9x9 matrices to solve per time step.
I'm wondering if
Smith bsmith at mcs.anl.gov wrote:
On Sun, 10 Jun 2007, Ben Tay wrote:
Hi,
I need to insert values into a matrix and then solve this poisson eqn as
part of my cfd code. For efficiency sake, I simply use
do j=1,size_y
do i=1,size_x
matsetvalue
end do
end do
Hi,
I need to insert values into a matrix and then solve this poisson eqn as
part of my cfd code. For efficiency sake, I simply use
do j=1,size_y
do i=1,size_x
matsetvalue
end do
end do
to insert values into all the cells
Then for specific cells, I need to enter some other
Hi,
I got this error during configure: Fortran could not successfully link C++
objects
My command is :
./config/configure.py --with-vendor-compilers=intel
--with-blas-lapack-dir=/usr/local/intel/mkl721cluster/ --with-debugging=0
--download-hypre=1 --with-x=0
Hi,
I found this link when doing a PETSc search.It is 30mins online lecture
which introduces and explains the use of PETSc on solving the laplace eqn.
Hope it's useful to new users
http://infostream.rus.uni-stuttgart.de/lec/307/537/real/
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to do this is to manualy edit bmake/$PETSC_ARCH/petscconf and
change PCC_LINKER to use 'win32fe f90'
Satish
On Fri, 1 Jun 2007, Ben Tay wrote:
Hi,
I'm using ms vc++ and vf in windows xp. I tried to compile PETSc 2.3.3p0
.
Running configure has no problem. Compiling seems ok
Hi,
I'm using ms vc++ and vf in windows xp. I tried to compile PETSc 2.3.3p0.
Running configure has no problem. Compiling seems ok but in the last part
when it tried to test examples, the error is
--Error detected during compile or link!---
See
Hi,
I tried to compile PETSc and there's no problem. I also used the
*--with-batch=1
*option since my server is using a job scheduler. There's no shared library
and I'm installing hypre too.
However, when after sending the job for ex1f, I got the error msg:
Can't read MPIRUN_HOST.
So what's
, Ben Tay wrote:
Hi,
I tried to compile PETSc and there's no problem. I also used the
*--with-batch=1
*option since my server is using a job scheduler. There's no shared
library
and I'm installing hypre too.
However, when after sending the job for ex1f, I got the error msg:
Can't
It's ex1f. Thanks
On 5/22/07, Satish Balay balay at mcs.anl.gov wrote:
Is this a PETSc example? Which one is it?
Satish
On Tue, 22 May 2007, Ben Tay wrote:
ok. I sorted out that problem. Now I got this error:
*** glibc detected *** double free or corruption (!prev
:
call PCSetType(pc,'hypre',ierr)
call PCHYPRESetType(pc,'boomeramg',ierr)
Satish
On Tue, 22 May 2007, Ben Tay wrote:
Hi,
presently I am using ./a.out -pc_type hypre -pc_hypre_type boomeramg to
use
hypre.
However, I have 2 matrix to solve and now I only want one of them to use
]
Satish
On Tue, 22 May 2007, Ben Tay wrote:
It's ex1f. Thanks
On 5/22/07, Satish Balay balay at mcs.anl.gov wrote:
Is this a PETSc example? Which one is it?
Satish
On Tue, 22 May 2007, Ben Tay wrote:
ok. I sorted out that problem. Now I got this error
Ops how careless. Thanks again.
On 5/22/07, Barry Smith bsmith at mcs.anl.gov wrote:
pcsettype
On Tue, 22 May 2007, Ben Tay wrote:
Sorry I got this error during linking:
petsc_sub.o(.text+0x20c): In function `petsc_sub_mp_petsc_solver_pois_':
/nfs/home/enduser/g0306332/ns2d_c
have used :
call PCHYPRESetType(pc,'boomeramg',ierr)
call PCSetType(pc,'hypre',ierr)
I changed the 2 order but it still can't work.
Thanks again
On 5/22/07, Ben Tay zonexo at gmail.com wrote:
Ops how careless. Thanks again.
On 5/22/07, Barry Smith bsmith at mcs.anl.gov wrote
?
Thanks
On 5/22/07, Satish Balay balay at mcs.anl.gov wrote:
you are probably doing this inside a loop. check the code.
satish
On Tue, 22 May 2007, Ben Tay wrote:
Sorry to trouble you ppl again.
The 1st step worked but subsequently I got the error msg
Hi,
I've built static PETSc library with mpi/hypre w/o problems. The test e.g.
also worked.
When I tried to built my own a.out, using -static (fortran), the error is
lgcc_s not found. removing it in the make file resulted in a lot of error
for mpich2.
btw, i do not have root access. the
Hi,
I've finished compiling PETSc and it use the fblaslapack external package.
May I know if I can delete the directories blas1-3, lapack1-6 and the
lapack-extra1-4?
Thanks
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Ok thank you very much
On 4/9/07, Barry Smith bsmith at mcs.anl.gov wrote:
On Mon, 9 Apr 2007, Ben Tay wrote:
Hi,
I am solving a poisson eqn and using hypre as a preconditioner has
greatly
increased the speed. I am trying to do some more tuning and I have some
questions:
1
Hi,
I've compiled PETSc on my school's server and I wonder if I can simply copy
the compiled shared library/include files to my home comp's linux. Both uses
redhat.
Is there anything else I have to take care?
Thank you
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Hi,
I've managed to use PETSc in Compaq visual fortran using
--download-blas-lapack=1 with mpi installed.
Now I tried to recompile PETSc with --with-mpi=0. I then tried to remove
mpich.lib from the linking options. compiling is ok but during linking, I
got these error msg:
linking...
is a stub
library for one process) libmpiuni.lib
Barry
On Mon, 5 Mar 2007, Ben Tay wrote:
Hi,
I've managed to use PETSc in Compaq visual fortran using
--download-blas-lapack=1 with mpi installed.
Now I tried to recompile PETSc with --with-mpi=0. I then tried to remove
mpich.lib from
Hi,
I've used --download-hypre=1 to integrate hypre into PETSc. I've found the
hypre directory in externalpackages. hypre takes up about 136mb. Can I
delete the files other than the library files (such as src) after I've
compile them?
Thanks alot!
-- next part --
An HTML
Hi,
I tried to compile PETSc with compaq visual fortran in cygwin. My command is
$ ./config/configure.py --with-cc='win32fe cl' --with-fc='win32fe f90'
--download-f-blas-lapack=1 --with-f90-interface=win32 --with-x=0
--with-mpi-dir=/cygdrive/c/program\ files/MPICH/SDK
I then got this error
Hi,
I have been using PETSc with visual fortran/intel mkl/mpich installed. This
has the same configuration as the configuration file .dsw supplied by PETSc.
However, now using another of my school's computer, MKL and MPICH are not
installed.
Is there anyway I can still use compaq visual fortran
problem with hypre - remove
externalpackages/hypre-1.11.1b and retry.
Satish
On Mon, 12 Feb 2007, Ben Tay wrote:
Hi,
I tried to compile PETSc again and using --download-hypre=1. My command
given is
./config/configure.py --with-vendor-compilers=intel
--with-blas-lapack-dir=/lsftmp
Hi,
I'm trying to experiment with using external solvers. I have some questions:
1. Is there any difference in speed with calling the external software from
PETSc or directly using them?
2. I tried to install MUMPS using --download-mumps. I was prompted to
include --with-scalapack. After
.
Thank you.
On 2/12/07, Satish Balay balay at mcs.anl.gov wrote:
On Mon, 12 Feb 2007, Ben Tay wrote:
Hi,
I'm trying to experiment with using external solvers. I have some
questions:
1. Is there any difference in speed with calling the external software
from
PETSc or directly using
eqn... wonder if hypre/BoomerAMG etc would help...
On 2/11/07, Lisandro Dalcin dalcinl at gmail.com wrote:
On 2/10/07, Ben Tay zonexo at gmail.com wrote:
In other words, for my CFD code, it is not possible to parallelize it
effectively because the problem is too small?
Is these true
Ya, that's the mistake. I changed part of the code resulting in
PetscFinalize not being called.
Here's the output:
-- PETSc Performance Summary:
--
/home/enduser/g0306332/ns2d/a.out on a linux-mpi named
--with-mpi-dir=/opt/mpich/myrinet/intel/
-
On 2/10/07, Ben Tay zonexo at gmail.com wrote:
Hi,
I tried to use ex2f.F as a test code. I've changed the number n,m from 3
to 500 each. I ran the code using 1 processor and then with 4 processor. I
then repeat
Hi,
I've tried to use log_summary but nothing came out? Did I miss out
something? It worked when I used -info...
On 2/9/07, Lisandro Dalcin dalcinl at gmail.com wrote:
On 2/8/07, Ben Tay zonexo at gmail.com wrote:
i'm trying to solve my cfd code using PETSc in parallel. Besides the
linear
:
Impossible, please check the spelling, and make sure your
command line was not truncated.
Matt
On 2/9/07, Ben Tay zonexo at gmail.com wrote:
ya, i did use -log_summary. but no output.
On 2/9/07, Barry Smith bsmith at mcs.anl.gov wrote:
-log_summary
On Fri, 9 Feb
Hi,
i'm trying to solve my cfd code using PETSc in parallel. Besides the linear
eqns for PETSc, other parts of the code has also been parallelized using
MPI.
however i find that the parallel version of the code running on 4 processors
is even slower than the sequential version.
in order to find
Hi,
somone suggested that I treat that face as a dirichlet boundary condition.
after 1 or a few iterations, the face value will be updated and it will be
repeated until covergerence. I wonder if that is possible as well?
It'll make the job much easier, although the iteration may take longer...
Hi,
May I know what's the difference between the optimized and debugging
version?
Have the optimization flags such as -O3 been used in the compilcation of the
libraries for the optimized one? Whereas for the debugging version, there is
no optimization by the compiler?
If my program works fine
to functions etc in the debug version.
Barry
On Mon, 29 Jan 2007, Matthew Knepley wrote:
On 1/29/07, Ben Tay zonexo at gmail.com wrote:
Hi,
May I know what's the difference between the optimized and debugging
version?
Have the optimization flags such as -O3 been used
.
Is there some other directory where they are usually install?
I'm wondering if I can use lapack + gotoblas together? I tried to specify
the libraries but ./configure failed.
Thank you.
On 1/27/07, Satish Balay balay at mcs.anl.gov wrote:
On Sat, 27 Jan 2007, Ben Tay wrote:
My school's server has
Hi,
I was discussing with another user in another forum (cfd-online.com) about
using PETSc in my cfd code. I am now using KSP to solve my momentum and
poisson eqn by inserting values into the matrix. I was told that using PETSc
this way is only for unstructured grids. It is very inefficient and
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