On Thu, Feb 19, 2015 at 1:11 PM, Jan Blechta <[email protected]> wrote: > On Thu, 19 Feb 2015 12:59:16 +0000 > "Garth N. Wells" <[email protected]> wrote: > >> I'm trying to use Hashdist to build FEniCS inside a Docker container. >> I have a few comments and questions: >> >> - The script at http://fenicsproject.org/fenics-install.sh takes an >> incredibly long time to run because it builds *so* many libraries, >> e.g. do we really need to be building openssl, freetype, zlib, >> libtiff, libxml2, sqlite, ncurses, png, etc? >> >> - Can I skip building the loads of libraries that I can get as >> binaries from my package manager? >> >> - Building ParMETIS, SCOTCH, MUMPS, etc, and then configuring with >> PETSc is guaranteed to end in tears (there has already been a bug >> report). PETSc should download and configure these because PETSc picks >> (and sometimes patches) compatible versions. If PETSc doesn't do the >> picking, then solvers will seg fault. >> >> - If the objective is a consistent 'stack', then using a Linux >> container is a better approach. >> >> - For decent performance, the Hashdist installer should install an >> optimised BLAS library, not reference BLAS. > > Really? I don't think that BLAS level 3 is used anywhere than in > manipulation with frontal matrices by MUMPS, UMFPACK. BLAS level 2 does > not apply to sparse matvecs and level 1 for vector axpys should have > essentially no impact. >
For most users, most time will be spent in the LU solver, the performance of which has a strong dependency on the BLAS implementation. When testing some time ago, I observed that the difference in time can be several factors. PETSc performance is also affected by the BLAS implementation. Garth > Jan > >> >> - While writing this message, Hashdist has crashed on petsc4py: >> >> File >> "/home/garth/.local/lib/python2.7/site-packages/Cython-0.21-py2.7-linux-x86_64.egg/Cython/Compiler/Main.py", >> line 22, in <module> 2015/02/19 12:56:05 - INFO: >> [package:run_job] from .Scanning import PyrexScanner, >> FileSourceDescriptor 2015/02/19 12:56:05 - INFO: [package:run_job] >> ImportError: >> /home/garth/.local/lib/python2.7/site-packages/Cython-0.21-py2.7-linux-x86_64.egg/Cython/Compiler/Scanning.so: >> undefined symbol: PyUnicodeUCS4_DecodeUTF8 >> 2015/02/19 12:56:05 - ERROR: [package:run_job] Command '[u'/bin/bash', >> '_hashdist/build.sh']' returned non-zero exit status 1 >> 2015/02/19 12:56:05 - ERROR: [package:run_job] command failed >> (code=1); raising >> >> Garth >> _______________________________________________ >> fenics mailing list >> [email protected] >> http://fenicsproject.org/mailman/listinfo/fenics > _______________________________________________ fenics mailing list [email protected] http://fenicsproject.org/mailman/listinfo/fenics
