[petsc-dev] PLAPACK problems

Matthew Knepley knepley at gmail.com
Wed Mar 17 11:34:19 CDT 2010

On Wed, Mar 17, 2010 at 12:30 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>   Some of the PETSc examples are crashing under some circumstances (like
> with complex) using PLAPACK and valgrind is showing uninitialized variables
> etc in PLAPACK code. I don't want to debug PLAPACK code, so will let it go
> for this release.
>  BUT, is there something else we can move to for petsc-dev in the future.
> Should we throw away the use of PLAPACK and use FLAMELIB? Should we switch
> to ScaLAPACK (just kidding?). I hate to bag dense parallell matrices from
> PETSc completely but don't want to spend a lot of time on whatever we do
> support.

Perhaps there should be a map of Robert's software empire. However, these
things are disjoint:

  - FLAME: Serial LA algorithms generated from a worksheet specification

  - PLAPACK: Distributed parallel LA

  - FLASH: Multicore parallel LA generated from worksheet specification

  - Jack's code: Update of PLAPACK which has much better scalability

Of course, I want to switch to the later. I am going to talk to Jack about
this when I am in Austin. He is
now the grad student of Lexing Ying, who if you don't know him, you really
should check him out.


>    Barry
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
-- Norbert Wiener
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