[petsc-dev] boomerAmg scalability

[Mark F. Adams]

It looks like the problem is in MatTransposeMatMult and Hong (cc'ed) is working on it.

I'm hoping that your output will be enough for Hong to figure this out but I could not reproduce this problem with any of my tests.

If Hong can not figure this out then we will need to get the matrix from you to reproduce this.

Mark

On Jan 12, 2012, at 6:25 PM, Ravi Kannan wrote:

> Hi Mark,
>  
> Any luck with the gamg bug fix?
>  
> Thanks,
> Ravi.
>  
> From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov] On Behalf Of Mark F. Adams
> Sent: Wednesday, January 11, 2012 1:54 PM
> To: For users of the development version of PETSc
> Subject: Re: [petsc-dev] boomerAmg scalability
>  
> This seems to be dying earlier than it was last week, so it looks like a new bug in MatTransposeMatMult.
>  
> Mark
>  
> On Jan 11, 2012, at 1:59 PM, Matthew Knepley wrote:
> 
> 
> On Wed, Jan 11, 2012 at 12:23 PM, Ravi Kannan <rxk at cfdrc.com> wrote:
> Hi Mark,
>  
> I downloaded the dev version again. This time, the program crashes even earlier. Attached is the serial and parallel info outputs.
>  
> Could you kindly take a look.
>  
> It looks like this is a problem with MatMatMult(). Can you try to reproduce this using KSP ex10? You put
> your matrix in binary format and use -pc_type gamg. Then you can send us the matrix and we can track
> it down. Or are you running an example there?
>  
>   Thanks,
>  
>     Matt
>  
>  
>  
> Thanks,
> Ravi.
>  
> From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov] On Behalf Of Mark F. Adams
> Sent: Monday, January 09, 2012 3:08 PM
> 
> To: For users of the development version of PETSc
> Subject: Re: [petsc-dev] boomerAmg scalability
>  
>  
> Yes its all checked it, just pull from dev.
> Mark
>  
> On Jan 9, 2012, at 2:54 PM, Ravi Kannan wrote:
>  
> 
> Hi Mark,
>  
> Thanks for your efforts.
>  
> Do I need to do the install from scratch once again? Or some particular files (check out gamg.c for instance)?
>  
> Thanks,
> Ravi.
>  
> From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov] On Behalf Of Mark F. Adams
> Sent: Friday, January 06, 2012 10:30 AM
> To: For users of the development version of PETSc
> Subject: Re: [petsc-dev] boomerAmg scalability
>  
> I think I found the problem.  You will need to use petsc-dev to get the fix.
>  
> Mark
>  
> On Jan 6, 2012, at 8:55 AM, Mark F. Adams wrote:
> 
> 
> 
> Ravi, I forgot but you can just use -ksp_view_binary to output the matrix data (two files).  You could run it with two procs and a Jacobi solver to get it past the solve, where it writes the matrix (I believe).
> Mark
>  
> On Jan 5, 2012, at 6:19 PM, Ravi Kannan wrote:
> 
> 
> 
> Just send in another email with the attachment.
>  
> From: petsc-dev-bounces at mcs.anl.gov [mailto:petsc-dev-bounces at mcs.anl.gov] On Behalf Of Jed Brown
> Sent: Thursday, January 05, 2012 5:15 PM
> To: For users of the development version of PETSc
> Subject: Re: [petsc-dev] boomerAmg scalability
>  
> On Thu, Jan 5, 2012 at 17:12, Ravi Kannan <rxk at cfdrc.com> wrote:
> I have attached the verbose+info outputs for both the serial and the parallel (2 partitions). NOTE: the serial output at some location says PC=Jacobi! Is it implicitly converting the PC to a Jacobi?
>  
> Looks like you forgot the attachment.
>  
>  
>  
> 
> 
>  
> -- 
> 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
>  

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