[Trilinos-Users] AztecOO: not enough memory for ILUT

Heroux, Michael A maherou at sandia.gov
Wed Feb 27 18:42:25 MST 2008


A fill-in level of 12 is unusually high and probably means there is some better approach to consider.  Have smaller fill-in values worked for you?  If not, what happens?


On 2/27/08 4:35 PM, "Tiziano Passerini" <tiziano.passerini at polimi.it> wrote:


many thanks for your quick answers,

Il giorno 27/feb/08, alle ore 13:10, Schiek, Richard L ha scritto:

Are you sure you're building 64bit binaries?  Many 64 bit systems will run both 32 and 64 bit binaries.  Check the compiler documentation to be sure.  You should be able to use the "file <binary_name>" to check this.  Here if I do "file myProg" and myProg is a 64 bit program then I get:

myProg: ELF 64-bit LSB executable, AMD x86-64

ok that's what I get:

./test: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped

 actually I do have the feeling that my problem has something to do with 64-bit binaries, but I thought I managed to control every stage of the compilation process.

I'm using gcc 4.2.3, which I compiled from scratch. I also checked each one of the libraries which are dynamically linked by my executable, and thay all are 64-bit shared objects.

maybe I should force somehow the use of 64 bit int? I don't know if this is feasible with gcc...

Il giorno 27/feb/08, alle ore 15:23, Heroux, Michael A ha scritto:


 Can you tell me what parameter values you are setting for ILUT?  Also, are you performing any local reordering for the preconditioner, e.g., RCM ?


I use ILUT fill-in = 12 and drop = 1e-5. I'm not performing local reordering - I didn't think about that :) I think I'll also have a deeper look at AztecOO documentation...


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