Salut, Nicolas pointed me to a missconfiguration in ubuntu, see http://groups.google.com/group/sage-devel/browse_thread/thread/5db90b3681e7dbcb/e2fde09f672c83fb?lnk=gst&q=sandpile#e2fde09f672c83fb.
This causes extreme slowdowns on ubuntu machines, here is an examples run on ubuntu and on mac for the records: cpu comparison: -- ubuntu sage: %timeit prod( i for i in range(1,10000) ) 25 loops, best of 3: 36.6 ms per loop -- mac sage: %timeit prod( i for i in range(1,10000) ) 25 loops, best of 3: 33.6 ms per loop list all permutations: -- ubuntu sage: G = PermutationGroup([(i,i+1) for i in [1..4]]) sage: %time L = list(G) CPU times: user 0.35 s, sys: 0.10 s, total: 0.45 s Wall time: 10.33 s -- mac sage: S = PermutationGroup([(i,i-1) for i in [1..4]]) sage: %time list(S) CPU times: user 0.02 s, sys: 0.03 s, total: 0.05 s Wall time: 1.11 s -- mac sage: S = PermutationGroup([(i,i-1) for i in [1..8]]) sage: %time L = list(S) CPU times: user 29.33 s, sys: 16.02 s, total: 45.35 s Wall time: 45.47 s The later computation is totally unreachable for ubuntu. I hope this will be fixed in the next version of ubuntu in 6 days (but I have no idea if it is reasonable to hope for it). Best, Christian -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
