Yes, there is no info to put into it so it is empty. Barry
The info file would contain "meta-data" about the matrix like block size. On Sun, 4 Jun 2006, Sh.M wrote: > Hi, > > When I now create these binary files they also create an info file. However > the info file is empty. Is it supposed to be like this? > > With best regards, Shaman Mahmoudi > > ----- Original Message ----- > From: "Sh.M" <shaman.mahmoudi.7099 at student.uu.se> > To: <petsc-users at mcs.anl.gov> > Sent: Sunday, June 04, 2006 7:41 PM > Subject: Re: Question about MatSetValues > > >> Thanks. >> >> I will try that. >> >> With best regards, Shaman Mahmoudi >> >> ----- Original Message ----- >> From: "Barry Smith" <bsmith at mcs.anl.gov> >> To: <petsc-users at mcs.anl.gov> >> Sent: Sunday, June 04, 2006 7:20 PM >> Subject: Re: Question about MatSetValues >> >> >>> >>> Write a SEQUENTIAL program that reads in the matrix and then >>> saves it with MatView() to a binary file (can do a right hand side also) >>> then use ksp/ksp/examples/tutorials/ex10.c which uses MatLoad() to solve >> the >>> system. >>> >>> See for example src/mat/examples/tests/ex32.c for an example of >>> sequential program for reading in ASCII matrix. Also ex34.c ex50.c also >> ex78.c >>> >>> >>> >>> Barry >>> >>> >>> On Sun, 4 Jun 2006, Sh.M wrote: >>> >>>> Hi, >>>> >>>> When using the MatSetValues function with one CPU only, it will >> cache/save >>>> the values locally and then distribute them to the other processes > with >>>> MatAssemblyBegin/MatAssemblyEnd? Is this true? What happens with the >>>> cached/saved values afterwards? Are they released? Is there a way to > not >>>> cache/save the data locally at all? >>>> >>>> I am asking these questions because right now speed is not of highest >>>> priority, but memory is. And unfortunately in my case I do not > generate >> the >>>> matrix by my own and instead read it from a file obtained from "real >> world" >>>> data samples. >>>> >>>> I have read/distributed the matrix in a couple of different ways; for >>>> example CPU 0 reads the file, and then calls MatSetValues.. One other >> way >>>> has been that CPU 0 reads the file, sends the rows that belong to the >> other >>>> processes to the other processes and those processes call MatSetValues >> by >>>> their own on the received rows. And last one is that I have split the >> file >>>> into several smaller files and several processes reads their own file >> and >>>> call MatSetValues on the data they have read from their own file. To >> make it >>>> more convenient for me, the number of files have been maximum number > of >>>> processors that I have used in my simulations. So If maximum number of >>>> processors is 64, then number of files is 64. And if 8 processors are >> used, >>>> then each processor reads 8 files etc. >>>> >>>> I dont believe any of the approaches I have used are elegant... >>>> >>>> What would you guys do if you had a file in CSR format, and you want > to >> read >>>> it, distribute it and then solve it if memory usage is of highest >> priority? >>>> >>>> With best regards, Shaman Mahmoudi >>>> >>>> >>> >> > >
