After upgrading my iBook G4 from 10.3.9 to 10.5.1 (and XCode from 1.5
to 3.0) I noticed that my application's performance, which depends
almost exclusively on cblas_sgemv, has decreased by about a factor of
10.
This is about the same factor that the benefit of using VecLib's
AltiVec enabled implementation was in the first time. In some (rare)
cases I had been able to regain the performance by switching to a
different SDK, but usually after a few compiles I'm back at the slow
speed.
Once compiled the application always runs at the same (fast or slow)
speed. I've checked that all arrays are fully aligned even in the slow
version.
My guess would be that sometimes a non-AltiVec enables BLAS library
gets compiled in - but where does it come from?
Any advice would be appreciated.
Tim
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Scitech mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/scitech/email@hidden
