[petsc-dev] [GPU] Performance on Fermi

[Richard Tran Mills]

Keita,

I'd just like to echo what Barry says.  I probably build petsc-dev on Jaguar 
more than any other person, and I generally don't have to manually edit any 
files generated by configure.py.  When I do, I either find and fix the problem 
in BuildSystem, or work with the petsc-maint folks to fix it.  If you will 
report problems to petsc-maint, we can work to ensure that you don't have to 
do these manual edits.

Best regards,
Richard

On 8/27/2010 8:00 PM, Barry Smith wrote:
>
> On Aug 27, 2010, at 4:34 PM, Keita Teranishi wrote:
>
>> Jed,
>>
>> I usually manually edit petscconf.h and petscvariables to change the installation configurations for Cray XT/XE.   The problem is configure script of PETSc picks up wrong variables and #define macros because the OS and library setting on the login node is different from the compute node.
>
>     Keita,
>
>       We would prefer that you complain to petsc-maint at mcs.anl.gov so that we can fix configure problems and not have anyone editing the generated files.
>
>     Barry
>
>     1) so that it works for all users not just those that know how to edit those files. We cannot fix problems we don't know about
>
>      2) editing those files repeatedly is fragile and it is easy to make a slight mistake that's hard to track down.
>
>
>>
>> This particular case is just a mistake in configure script (and it's not a big deal to fix), but it will be great if you have any ideas to avoid picking up wrong settings.
>>
>> Thanks,
>> ================================
>>   Keita Teranishi
>>   Scientific Library Group
>>   Cray, Inc.
>>   keita at cray.com
>> ================================
>>
>>
>> -----Original Message-----
>> From: Jed Brown [mailto:five9a2 at gmail.com] On Behalf Of Jed Brown
>> Sent: Friday, August 27, 2010 4:29 PM
>> To: Keita Teranishi; For users of the development version of PETSc
>> Subject: RE: [petsc-dev] [GPU] Performance on Fermi
>>
>> On Fri, 27 Aug 2010 16:18:43 -0500, Keita Teranishi<keita at cray.com>  wrote:
>>> Yes, I replaced all the compiler flags by -O3.
>>
>> petsc-maint doesn't come to me, but if the snippet that Barry quoted was
>> from your log_summary, then PETSC_USE_DEBUG was definitely defined when
>> plog.c was compiled.  It's really much easier to have two separate
>> builds and always use the optimized one when profiling.
>>
>> Jed
>

-- 
Richard Tran Mills, Ph.D.            |   E-mail: rmills at climate.ornl.gov
Computational Scientist              |   Phone:  (865) 241-3198
Computational Earth Sciences Group   |   Fax:    (865) 574-0405
Oak Ridge National Laboratory        |   http://climate.ornl.gov/~rmills