On Fri, Jun 3, 2011 at 2:57 PM, Alan Wei <zhenglun.wei at gmail.com> wrote:
> Dear Sir/Madam, > Lately, I read there is a optimized version of PETSc by using > '--with-debugging=0'. I have two questions here: > 1, Do I need to use '/config/configure.py ... --with-debugging=0' when I > configure the PETSc in order to use the non-debugging version of PETSc? > Therefore, if I want to switch PETSc between these two versions, I have to > keep configuring. > Configure makes a directory with all the information in it (including libraries) for that particular configuration. You set the PETSC_ARCH env var to that string (e.g. linxu-gnu-c-debug) when you want to use a particular configuration. > 2, I was using the '--with-debugging=0' to configure the PETSc. However, I > tested the computational rate by executing the ex29.c. The non-debugging > version does not improve the speed much; in the contrary, it slow down the > speed a little bit. The comparison is attached here. Any idea on this. > The only way we can help on performance questions is to see the output of -log_summary. Matt > thanks in advance, > Alan > > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110603/acfc10ba/attachment.htm>
