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wfgarnett3 2004-03-27 11:34

is LLR working right?
Is LLR working right?

I am using a Pentium III 600 Mhz.

For PRP, when I test the Riesel number:
it has a per iteration time of around 7.6 ms.

However, when I use this new LLR, it has a per iteration time of around 6.3 ms.

Is there something wrong?


Edit: here is the llrresults file:

[Sat Mar 27 06:32:50 2004]
Using IBDWT : Mersenne fftlen = 14336, Proth fftlen = 28672, Used fftlen = 28672

paulunderwood 2004-03-27 12:24

Jean wrote Yahoo! primenumbers:

[QUOTE]So, this program uses IBDWT only if k <= 511 in non SSE2 code, and (alas...) k <= 31 in SSE2 code ; for larger k's, it works exactly like the previous LLR version, using Proth mode and rational bases FFT. But for really small k's, it is a major improvement:

So it is very small k <=31 on a SSE2 P4 that get's the maximum boost of about 400%

paulunderwood 2004-03-27 12:49

[QUOTE]this program uses IBDWT only if k <= 511 in non SSE2 code[/QUOTE]

I wonder if Jean meant less than 256 which is 2^8 ... :unsure:

ET_ 2004-03-27 16:54

[QUOTE=Maybeso]What about bumping the priority to maximum, and then stopping it. Would that help?


No it wouldn't. The prorgam seems to start correctly, but the first iteration count comes out after 2-4 minutes. :sad:


Thomas11 2004-03-31 18:25

Just one short note:

It seems that the "+016" bug happens under Windows only. I've tested some low n-values for k=5 and k=7 twice on a Athlon runing Windows and on a P4 running Linux. I've got some "+016" results on the Athlon/Windows but not on the P4/Linux.
As Paul already noted, the Res64 values are the same, so I expect it to be a bug in the screen/file output routine and not in the entire calculation.

Well, from the above I could also conclude that it is a problem of the Athlon. But I guess, that most of you, who encountered the same problem, are using P4 machines running some version of Windows ...

-- Thomas.

P.S.: Tomorrow my machine(s) will take an out-time, since due to maintenance work we will be out of electrical power the whole day. So, don't expect any new primes from my end for tomorrow :yawn:

wfgarnett3 2004-04-12 03:21

next version LLR
Next version of LLR released with few bug fixes.


paulunderwood 2004-04-12 11:37

Thanks for the link William.

I am still having problems with "stop/continue" and starting LLR if a "save file" exists. A save file is created when you shutdown Windoze. I get around the problem by making sure no "save files" exist by use of the following dos batch file in C:\WINDOWS\Start Menu\Programs\StartUp\llr.bat

cd \paul\llr -- this will be different for you
del y*.*
del z*.*

Jean Penne assure me that "stop/continue" does work after a time -- but to me it seems an inordinate amount of time!

ET_ 2004-04-12 11:55

[QUOTE=wfgarnett3]Next version of LLR released with few bug fixes.


Waiting to download it from GIMPS :rolleyes:


paulunderwood 2004-08-01 22:24

Jean Penne is about make available the very latest LLR ( based on George Woltman's latest IBDWT library?) [URL=]see here[/URL] Also keep a look over the next few days for the new program at [URL=][/URL] Jean claims to have fixed the stop/continue bug... :cool:

Big thanks to Jean and George :bow: :bow: :bow:

Lupine1647 2004-08-01 22:55

All bow down to the great creators!!!!

:bow: :bow: :bow: :bow: :bow: :bow:

ET_ 2004-08-02 11:51


I'll download it as soon as it is released!


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