Dear Sylvestre, On Tue, Feb 16, 2010 at 03:35:28PM +0100, Sylvestre Ledru wrote: > > > > Since SVD is something I consider very important, I would request you > > > to please re-upload Blas with an optimization level of -O2, so that > > > things remain sane with all the reverse dependencies. > > OK, thank for your investigation. I will do that then. > I had a look and the problem is that blas is compiled by default with > -03. I am afraid of switching to -02 decreases the performance on a key > component... > However, I have a few leads: > * disable optimisation for just this file
But which file? From what I can see, zgesvd in Lapack seems to indirectly call several Blas functions. So, which file would you compile with -O2? > * see if forcing gcc-4.3 brings back the initial behavior True, but this is not a permanent solution, since it is unlikely that Squeeze will be shipped with two gcc's. > * report upstream (which I will probably have to do anyway) That is true. There is a fourth option: * Use -O2 on amd64, and -O3 on the rest: this is a sane option, since Atlas is available anyway on amd64, and Atlas provides better performance than the corresponding Blas/Lapack libraries anyway. Would you be agreeable to this? Thanks for looking into this. Kumar -- Bigotry tries to keep truth safe in its hand With a grip that kills it. - Rabindranath Tagore (Fireflies, 1928) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100216144034.gi7...@146653177.ece.utexas.edu
