[petsc-users] Performance of superlu_dist

[Ormiston, Scott J.]

I am just starting to try superlu_dist to get a direct solver that runs 
in parallel with PETSc.

My first tests (with ex15f) show that it takes longer and longer as the 
number of cores increases. For example 4 cores takes 8 times longer than 
2 cores and 8 cores takes 25 times longer than 4 cores.  Obviously I 
expected a speed-up; has anyone else seen this behaviour with 
superlu_dist? If not, what could be going wrong here?

Scott Ormiston
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SJ_Ormiston.vcf
Type: text/x-vcard
Size: 321 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110401/8e226406/attachment.vcf>