[QUOTE=davieddy;140929]0.0224 sec/iter means ten days for 40M iterations.[/QUOTE]

Please keep in mind that we were running on lower performing code prior to today so that figure has limited bearing on the DC run as a whole. :innocent:

[QUOTE=T.Rex;140875]I'll see tomorrow which FFT length is used now by Glucas. I remember I've seen several messages at the beginning saying that Glucas has increased the FFT length in order to reduce the level of error under the required limit.[/QUOTE]As Ernst said, no way to say the FFT length. However, yes, Glucas had 4 "roundoff" errors and at the end it decided to change the FFT length:
[FONT="Georgia"][I]Restarting. Changed FFT length[/I].[/FONT]
T.

[quote=rgiltrap;140937]Please keep in mind that we were running on lower performing code prior to today so that figure has limited bearing on the DC run as a whole. :innocent:[/quote]
Since 13 days have passed since the initial discovery, you can
rest assured I am bearing that in mind.:smile:

[quote=T.Rex;140938]As Ernst said, no way to say the FFT length. However, yes, Glucas had 4 "roundoff" errors and at the end it decided to change the FFT length:
[FONT=Georgia][I]Restarting. Changed FFT length[/I].[/FONT]
T.[/quote]
That must be disappointing for you.
More power to my suggestion that 2048K is inadequate!

Well, I hope you get that 30% speed increase working!

[quote=ixfd64;140947]Well, I hope you get that 30% speed increase working![/quote]
???

See post #273.

30% done
 

30% done on my side. Still late...

[quote=ixfd64;140949]See post #273.[/quote]
Are you having difficult keeping up to the pace of posting?
I think the rate of growth of this thread is probably record-breaking.

[QUOTE=T.Rex;140938]As Ernst said, no way to say the FFT length. However, yes, Glucas had 4 "roundoff" errors and at the end it decided to change the FFT length[/QUOTE]

I must say, I find that very surprising - apparently the accuracy loss from Glucas' fast-multiply-up-of-roots-of-unity-and-DWT-weights scheme is significantly more than I expected.

[b]"And the specially modified Lamborghini blows the doors off the garage..."[/b]

Here are timings for the same 16-thread 4096K FFT running on 4 quad-cores of the Sparc VII:

[i][Sep 04 08:11:23] Mxxxxxxxx Iter# = 2**00000 clocks = 00:33:51.000 [ 0.0203 sec/iter] Res64: CC42FF0C3E6FDD1E AvgMaxErr = 0.000002711. MaxErr = 0.000003815[/i]

[QUOTE=rgiltrap;140925]As of today we have the nice new Mlucas code release working which means we have a bit more speed and a lot more reliability in terms of restart capability (just in case if anything goes pear shaped).[/QUOTE]

So Ernst, are you going to make this shiny new Mlucas code available to everyone when this is all over? :tu:

I don't have any Ferrari's or Lamborghini's in my garage, and I can't even use any special Bull Linux tricks. I'm just hoping to squeak in a finish before Tony even though I had quite a head start... :cry: