yeah it is not clear whether it is just athlon 64's. i.e. those machines formerly called K9.
My Turion would probably also be just fine. Bill. 2009/3/4 <ja...@njkfrudils.plus.com>: > > On Wednesday 04 March 2009 16:29:30 Bill Hart wrote: >> My guess would be stalls due to unavailability of data from the cache >> in time for the pipeline. Some insertions of nop's would probably make >> this go away. That may or may not affect the timings on Opteron. >> >> I suspect it is only an issue on cheaper processors like the Athlon 64 >> x2 and Turion 64 x2. I have one of the latter, and it would be >> interesting to try out. I have linux on this machine so I could >> possibly give it a go. But it might be tomorrow before I get to it. >> >> I also have an Athlon 64 x2 at home. >> >> It's not clear how much effort we should expend on optimisation for >> home market PC's. I'm not saying we shouldn't do it. I'm just saying >> it is not clear how much we should do for it. >> >> Bill. > > My K8(sempron) cost less than two pizza's , and it runs addmul just great. > K8 £15 > m/b £23 > mem £8 > rest of the system is crap > - Show quoted text - >> >> 2009/3/4 <ja...@njkfrudils.plus.com>: >> > - Show quoted text - >> > >> > On Wednesday 04 March 2009 15:57:25 Cactus wrote: >> >> On Mar 4, 3:49 pm, ja...@njkfrudils.plus.com wrote: >> >> > On Wednesday 04 March 2009 15:40:04 Bill Hart wrote: >> >> > > This is on a K10. The runs differ significantly. Interesting. >> >> > > >> >> > > It might have to do with the almost completely unpredictable >> >> > > scheduling on the K10. Certainly the differences at limb n are >> >> > > almost always made up again, or nearly so, at limb n+1, and by the >> >> > > end of 40 limbs the times are usually within a cycle or so. On >> >> > > average performance doesn't vary. >> >> > > >> >> > > Bill. >> >> > >> >> > My K8 is very stable, the K10(cuda1) a bit less so , and I found the >> >> > core2 (sage.math) to be all over the place . You could try increasing >> >> > the precision , yet again. >> >> > >> >> > > 2009/3/4 Jeff Gilchrist <jeff.gilchr...@gmail.com>: >> >> > > > On Wed, Mar 4, 2009 at 10:27 AM, Bill Hart >> >> > > > <goodwillh...@googlemail.com> >> >> > >> >> > wrote: >> >> > > >> I've just noticed that the times from speed are not consistent >> >> > > >> between runs!! I thought that was almost impossible. >> >> > > > >> >> > > > I did several runs on my systems and they all agreed for me, even >> >> > > > when the system was loaded or not. >> >> > > > >> >> > > > Jeff. >> >> > > > - Show quoted text - >> >> >> >> I do see some variation on my Core 2 portable but my Athlon X2 gives >> >> consistent results. The variation on the Core 2 is not large enough to >> >> worry about. >> >> >> >> By the way, does anyone have a theory about the mpn_mul_1 curve (2nd >> >> to bottom) that goes up and down regularly? >> > >> > thats the green line , your windows K8 >> > >> > mpn_mul_1 and mpn_addmul_1 on K8 are the same function(practically) , but >> > the addmul doesn't display that behavour. >> > - Show quoted text - >> > >> >> Brian >> >> > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "mpir-devel" group. To post to this group, send email to mpir-devel@googlegroups.com To unsubscribe from this group, send email to mpir-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/mpir-devel?hl=en -~----------~----~----~----~------~----~------~--~---
