Andy, Prof. Ripley - thanks for your replies. > CFLAGS was not specified, so should default to "-g -O2". It is definitely > worth checking, although almost all the time in these tests will be spent > in Fortran code. Yes - I verified that's the default.
> >> neither build uses a BLAS. > > Well, they do, the one supplied with R (which is in Fortran). I guess I should have said that neither build is using an optimized BLAS. (which I am planning to install - I just haven't had the chance yet.) I also get a message in config.log "ld: fatal: library -lblas: not found". I need to investigate this more. > and for gcc 3.4.3 and the internal BLAS (which I had to build for these > tests) I get > > 32-bit > [1] 9.96 0.09 10.12 0.00 0.00 > 64-bit > [1] 9.93 0.04 10.04 0.00 0.00 > > so I am not seeing anything like the same performance difference between > 32- and 64-bit builds (but it could well depend on the particular Sparc > chip). These timings are much, much less than what I reported (~700s and 2200s for 32 bit and 64 bit). I read the admin manual and didn't see anything specifically that needs to be set to use the internal BLAS. I guess I'll go back and do some more investigation. Thanks for your help. ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html