On Sunday 30 November 2008, William Stein wrote: > On Sun, Nov 30, 2008 at 12:37 PM, Martin Albrecht > > <[EMAIL PROTECTED]> wrote: > >> Here's another example: > >> 64-bit: > >> sage: time a = random_matrix(ZZ,200).determinant() > >> CPU times: user 2.74 s, sys: 0.01 s, total: 2.75 s > >> > >> 32-bit: > >> sage: time a = random_matrix(ZZ,200).determinant() > >> CPU times: user 0.74 s, sys: 0.04 s, total: 0.78 s > >> > >> Here, surprisingly, 64-bit is WAY SLOWER than 32-bit at doing the > >> exact same thing. I don't really understand this. The moral should I > >> think be that 32 versus 64 bit can be really subtle when it comes to > >> performance. > > > > It seems to me that this should be considered a bug. > > I don't think "bug" is the right word -- however, fixing this or giving a > good explanation should be considered an "Enhancement".
Sorry for the harsh word, I agree that the difference should be investigated and fixed if possible, maybe for some reason the 8-byte pointers are really killing it for some reason. Cheers, Martin -- name: Martin Albrecht _pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99 _www: http://www.informatik.uni-bremen.de/~malb _jab: [EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
