On Fri, Mar 07, 2003 at 09:51:33PM -0800, Chris Marble wrote: > Daran wrote: > > > > On Thu, Mar 06, 2003 at 08:12:31PM -0800, Chris Marble wrote: > > > > > Daran wrote:
> I like my stats but I could certainly devote 1 machine out of 20 to this. If you're going to use one machine to feed the others, then it won't harm your stats at all. Quite the contrary. > Assume I've got 1GB of RAM. Do the higher B2s mean I should use a P4 rather > than a P3 for this task? I don't know, because I don't know why it gets a higher B2. B1 and B2 are supposed to be chosen by the client so that the cost/benefit ratio is optimal. Does this mean that P4s is choose B2 values which are too high? Or does everything else choose values too low? Or is there some reason I can't think of, why higher values might be appropriate for a P4? In fact, I'm not even sure it does get a higher B2 - the apparent difference could be, as Brian suggested, due to differences between versions. I don't have access to a P4, so I can do any testing, But I'd appreciate it if you or someone else could try starting a P-1 on the same exponent (not in one of the ranges where it would get a different FFT length) on two different machines, with the same memory allowed. You would not need to complete the runs. You could abort the tests as soon as they've reported their chosen limits. > Would I unreserve all the exponents that are already P-1 complete? > If I don't change the DoubleCheck into Pfactor then couldn't I just let > the exponent run and then sometime after P-1 is done move the entry and > the 2 tmp files over to another machine to finish it off? If you're going to feed your other machines from this one, then obviously you won't need to unreserve the exponents they need. But there's an easier way to do this. Put SequentialWorkToDo=0 in prime.ini, then, so long as it never runs out of P-1 work to do, it will never start a first-time or doublecheck LL, and there will be no temporary files to move. I also suggest putting SkipTrialFactoring=1 in prime.ini. > That sounds like more work than I care to do... I agree that with 20 boxes, the work would be onerous. > ...I can see having 1 machine > do P-1 on lots of double-checks. That would be well worth it. Since one box will *easily* feed the other twenty or so, you will have to decide whether to unreserve the exponents you P-1 beyond your needs, or occasionally let that box test (or start testing) one. You may find a better match between your rate of production of P-1 complete exponents, and your rate of consumption, if you do first-time testing. [...] > As an mprime user I edit the local.ini file all the time. Per your notes > I upped *Memory to 466. That will certainly help exponents below 9071000 on a P3, or 8908000 on a P4. The current DC level is now over 9170000, so I doubt this will help much, (though of course, it won't harm, either). I haven't tried. I'm still getting enough sub 9071000 expiries. > -- > [EMAIL PROTECTED] - HMC UNIX Systems Manager Daran G. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
