On Aug 21, 2011, at 12:21 PM, Jose E. Roman wrote: > > Ok. I will take the opportunity to update the other partitioners. By the way, > the interface to Jostle is broken. Jostle is not distributed in source code, > so I would vote for removing the interface. Any objection?
Yes, take Jostle out. Supposedly someone here is doing a new parmetis so you shouldn't do that one. > > Question: I used identifiers such as MP_PTSCOTCH_QUALITY as a shortcut of > MATPARTITIONING_PTSCOTCH_QUALITY. Should the long version be preferred? We are limited by 31 characters total so your short cut is correct. Barry > > Jose > > > El 20/08/2011, a las 22:17, Barry Smith escribi?: > >> >> I have updated all the Scotch stuff to use the proper PTScotch names: >> >> --download-ptscotch -mat_partitioning_type ptscotch >> MatPartitioningSetType(p,MATPARTITIONINGPTSCOTCH) Scotch.py to PTScotch.py >> etc etc >> >> You will need to hg pull BuildSystem also. >> >> >> Barry >> >> >> On Aug 20, 2011, at 3:10 AM, Jose E. Roman wrote: >> >>> >>> El 20/08/2011, a las 05:45, Barry Smith escribi?: >>> >>>> >>>> Questions for anyone with knowledge on this subject: >>>> >>>> Are Scotch and ptscotch different packages? >>> >>> They are different libraries but are included in the same distribution >>> file. The tarball contains both the serial and parallel versions (as >>> opposed to e.g. Metis/Parmetis). >>> >>>> >>>> How come the download site has scotch_5.1.11.tar.gz and >>>> scotch_5.1.11_esmumps.tar.gz and neither mentions ptscotch do one or both >>>> of them contain ptscotch? Do either contain scotch? What is the mumps >>>> business in the name? >>> >>> Both of them contain scotch+ptscotch. I have diff'ed the two of them. The >>> esmumps one contains an additional file esmumps.c with a single function >>> esmumps(): "This routine acts as an interface between ordering software >>> such as MUMPS and Scotch+Emilio." The other difference is that esmumps has >>> typedef int32_t SCOTCH_Num; >>> instead of >>> typedef int SCOTCH_Num; >>> (also for indices) so probably 64-bit integers/indices are disabled in this >>> version. >>> >>>> >>>> If this uses ptscotch why is the call in the source code >>>> SCOTCH_dgraphBuild()? and doesn't mention pt? >>> >>> The differences in usage/interface between scotch and ptscotch are very >>> small: >>> 1) One has to include either scotch.h or ptscotch.h, and link with -lscotch >>> or -lptscotch >>> 2) For ptscotch one has to use distributed graphs, i.e. call >>> SCOTCH_dgraph*() instead of SCOTCH_graph*() >>> Apart from this, the interface seems to be the same. >>> >>>> >>>> If scotch and ptscotch are different shouldn't scotch.py be called >>>> ptscotch.py? >>> >>> They are different because the algorithms available in the parallel version >>> are much more limited compared to the serial version. But since they are >>> both included in the same distribution file, I guess it doesn't matter to >>> call it scotch.py or ptscotch.py. >>> >>> In terms of MatPartitioning, it could be possible to create two >>> partitioners, one for scotch and another for ptscotch. But I think it is >>> far more useful to have the ptscotch interface, because the sequential one >>> would require gathering the whole graph in a single process (as it happens >>> with chaco and party). Also, in that case one could also have another one >>> for Metis (since the method is not exactly the same as Parmetis). >>> >>> >>>> >>>> Pastix seems to use either scotch or ptscotch? Will anyone ever fix the >>>> install of pastix.py for PETSc? Will that require a --download-scotch that >>>> installs sequential scotch? >>> >>> I have no idea about Pastix (I haven't seen pastix.py in petsc-dev), but I >>> guess it will be enough to force --download-scotch together with >>> --download-pastix. >>> >>> Jose >>> >>>> >>>> >>>> Barry >>>> >>>> >>>> >>>> >>>> >>>> On Aug 19, 2011, at 6:10 PM, Jose E. Roman wrote: >>>> >>>>> I have rewritten the Scotch interface so that it can be used again as a >>>>> MatPartitioning object. I have done limited testing, so please let me >>>>> know if problems arise. >>>>> >>>>> The interface is really to PT-Scotch rather than serial Scotch. >>>>> >>>>> Some comments regarding configure's download-scotch option: >>>>> - It will probably fail in batch environments since the program >>>>> 'dummysizes' must be run before compiling >>>>> - Compilation requires lex & yacc, I don't know if these are tested by >>>>> configure. >>>>> >>>>> Jose >>>>> >>>> >>> >> >
