[Trilinos-Users] strange performance on simple matrix/vector product
jagfsdfhf at libero.it
Thu Feb 28 10:11:52 MST 2008
Hello, I have a strange performance problem on Epetra, using a simple
I have two configurations for testing purposes, the first one is a
personal laptop, single core duo T2300 with 1GB of RAM, the second one
is a dual Xeon quad core E5345 with 16GB of RAM
I take as an example the matrix e30r5000 from matrix market. The matrix
is imported into trilinos and multiplied via Epetra multiply function by
a random vector, i take the time and i get 0.0148 seconds on my laptop
and 0.00227 seconds on the dual Xeon; now, since I'm not the only one
using the Xeon I wrote another test for comparison; this time I multiply
"by hand" storing the matrix in crs, this is what I got:
on my laptop - 0.00168 seconds
on the Xeon - 0.00168 seconds
so basically I have the same time on manual implementation, but trilinos
is sensibly slower on the dual xeon.
I prepared many more matrixes on which I tested the same program; on
many of them the Xeon has better times performing the manual multiply
then the laptop, but Trilinos multiply is always slower...
I understand it's quite hard to tell what the problem might be, but is
there something I'm missing?
I mean, I'm using just one core on each machine, but a core on my laptop
is a 1.6Ghz, wether the Xeon goes at 2.33Ghz... 32 bit vs 64 bit, 2MB vs
8MB of cache... and it generally shows on the product I wrote...
if anyone has any idea I'd be gratefull
thanks in advance and sorry for my english
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