On 16:48 Fri 04 Apr , Ellis Wilson wrote: > Thanks for your suggestions, I had already begun testing Goto BLAS > when I got your email, and it has been thus far the most beneficial > one to my particular application residing on a CD-ROM. MKL proved to > be far too heavyweight (and I try to avoid closed source as often as > possible). The only difficulties have come with the compilation of > Goto BLAS (or anything, for that matter) on a static system such as a > LiveCD. As I do not include in my LiveCD (in order to keep its total > size and initrd loaded size down as low as possible) the portage tree, > nothing can be emerged.
You could include only the small subset of the tree you need. > This has required me to pursue a number of solutions, the first being > to copy the full version of it directly into the tmpfs from a usb pen, > uncompress it, chroot into that environment, compile on the > architecture desired, exit the chroot, recompress, and put it back on > the usb for later burning. Obviously, this requires a ton of work, so > I came up with an easier fix that has interesting repercussions I'd > like to hear from this list on: > > An NFS directory is mounted onto my system, which I chroot into, > compile Goto-BLAS or ATLAS upon, and exit the chroot. Since the > directory remains on my development system (which does use a > harddrive) I have no issues with running out of RAM, moving this there > or the other place, etc. However, upon compiling Goto-BLAS on an > older P4 without HT and with 256MB RAM, it reported warnings due to > "clock-skew" I've never seen previously. Is this due to the NFS > mount? And if so, will it hurt my optimization of Goto BLAS or ATLAS? > I still achieved 4GFlops on the P4 I had used that methodology upon, > which was way above my previous findings using the reference library > (obviously), but I still have my concerns that better optimization > might occur with local compilation. > > Anyone think thats true/false? In the case of Goto, the optimization will be a function of the compiler and compiler flags you use, not whether you compile it on a local or remote disk. For ATLAS, I suppose the difference in I/O could affect its automatic tuning if for some reason it's not doing it all in memory, but that seems unlikely. Thanks, Donnie _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
