1) Please send these to petsc-maint at mcs.anl.gov On 6/14/07, Shi Jin <jinzishuai at yahoo.com> wrote: > Hi, > > I am trying to study the new unstructured mesh part > provided by the new Petsc. I have one particular > question with regard to the function call > MeshDistribute(serialMesh, PETSC_NULL, ¶llelMesh);
2) The PETSC_NULL can be used to specify another partitioner like "parmetis" 3) Not sure about the argument. You would have to refer to the package. Matt > This call obviously needs the chaco package to run in > parallel since otherwise I will get a warning to > configure with --download-chaco. > So I ran it with chaco installed. The code works but > the domain decomposition is valid but far from good. > In the attached image, I am showing the domain > decomposition for a 2-dimensional 1x1 box with two > processes, using the following statements: > MeshCreatePCICE(comm, 3, > "bratu_2d.nodes","bratu_2d.lcon",PETSC_FALSE,PETSC_FALSE, > &serialMesh); > MeshDistribute(serialMesh, PETSC_NULL, ¶llelMesh); > > I am wondering if it is possible to improve the domain > decomposition by passing some command arguments. I > realized that there are Chaco options such as > -mat_partitioning_chaco_global (found at > http://www-unix.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/MatOrderings/MAT_PARTITIONING_Chaco.html) > . However, when I pass these options to my code, it is > not recognized. I wonder how chaco is used in Petsc > and how I can change its behavior. > > In addition, is it possible to use other graph > decomposition packages such as ParMetis to implement > MeshDistribute()? I tried to enable ParMetis without > chaco but the code didn't run and warned me to install > chaco. > > Any advice is valuable. Thank you very much. > > Shi > > > > ____________________________________________________________________________________ > Finding fabulous fares is fun. > Let Yahoo! FareChase search your favorite travel sites to find flight and > hotel bargains. > http://farechase.yahoo.com/promo-generic-14795097 > -- 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
