Hi Aron, Thanks for the information...everything is clear now.
Hope you will be back to Ireland soon. Sure the weather can be miserable but nothing beats a good hike in the rain followed by a good pint of Guinness. Actually Guinness is pretty good with everything including PETSc coding :-) Regards. On Wednesday 27 June 2007 14:19, Aron Ahmadia wrote: > Dear Tim, > > I was just in Ireland a few weeks ago, had a great time climbing > Carantouhil and the Pilgrim's Path :D > > Have you tried declaring a new $PETSC_ARCH and then overriding the > optimization flags in ./conf/configure? PETSc likes to use the > $PETSC_ARCH flag to maintain all local builds under the same directory > structure instead of the -prefix flags common to autoconf-style > builds. > > Ideally you'd do something like this... > > declare -x PETSC_ARCH=petsc_linux_o3 > cd $PETSC_DIR > ./config/configure.py --COPTFLAGS=-O3 > make > > If you want to build a debugging version as well, then type: > declare -x PETSC_ARCH=petsc_debug > ./config/configure.py --with-debugging=1 > > you'll then be able to use PETSc makefiles to build your code as long > as you declare your PETSC_ARCH and PETSC_DIR variables ahead of time. > > Let me know if this works! > ~Aron > > On 6/27/07, Tim Stitt <timothy.stitt at ichec.ie> wrote: > > Hi PETSc Users/Developers, > > > > Could someone explain how I can override the default optimization level > > that comes with my PETSc build (currently -O). I want to set a more > > aggressive optimization level (e.g. -O3) for my compiler (PathScale). > > > > Ideally I would prefer a solution which doesn't involve rebuilding PETSc > > each time I want to switch the optimization level. I tried to add the > > switch to the petscrules file but it always defaulted to the first > > (lower?) optimization switch that appeared in the application compile > > command line which seems to be built into PETSc. > > > > Any help gratefully received. > > > > Regards, > > > > Tim. > > > > -- > > Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie> > > HPC Application Consultant - ICHEC (www.ichec.ie) > > > > Dublin Institute for Advanced Studies > > 5 Merrion Square - Dublin 2 - Ireland > > > > +353-1-6621333 (tel) / +353-1-6621477 (fax) / +353-874195427 (mobile) -- Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie> HPC Application Consultant - ICHEC (www.ichec.ie) Dublin Institute for Advanced Studies 5 Merrion Square - Dublin 2 - Ireland +353-1-6621333 (tel) / +353-1-6621477 (fax) / +353-874195427 (mobile)
