yafu bugs

[debrouxl]

Is it not possible to run multiple SIQS jobs at once?

I'm not sure it is possible to run parallel SIQS jobs (it depends on whether yafu creates files in the current working directory, or in the folder containing yafu - so far, I've always used yafu with the current working directory being the folder containing yafu...), but AFAICT, it's impossible to run parallel SIQS jobs from the same folder: they will share files.

[bsquared]

Yeah, running multiple jobs in the same folder is not supported - files will stomp on each other and yafu will probably crash. Not sure either about parallel jobs in different folders... never tried it.

[Dubslow]

Originally Posted by bsquared

Yeah, running multiple jobs in the same folder is not supported - files will stomp on each other and yafu will probably crash. Not sure either about parallel jobs in different folders... never tried it.

I'm pretty sure it is possible to run ECM parallel in the same folder -- at the very least it doesn't crash, and I haven't seen bad factors yet. I assume though that NFS is like SIQS in this regard?

[bsquared]

Originally Posted by Dubslow

I'm pretty sure it is possible to run ECM parallel in the same folder -- at the very least it doesn't crash, and I haven't seen bad factors yet. I assume though that NFS is like SIQS in this regard?

Yes, although I forgot to mention that there is a command line option to specify a different savefile so that you can run more than one job in the same folder.

-qssave <filename>

There is something similar for nfs but I can't remember what offhand.

[Dubslow]

Originally Posted by bsquared

Yes, although I forgot to mention that there is a command line option to specify a different savefile so that you can run more than one job in the same folder.

-qssave <filename>

There is something similar for nfs but I can't remember what offhand.

Ah, cool, thanks

[Dubslow]

http://www.mersenneforum.org/showthr...124#post298124

Batalov said it's definitely not right, and worthy of debugging.

[bsquared]

Originally Posted by Dubslow

http://www.mersenneforum.org/showthr...124#post298124

Batalov said it's definitely not right, and worthy of debugging.

I don't quite have enough info to go on... could you email me your factor.log file, to see if there are any clues there? Also perhaps the poly file (the .job file). Were you running single threaded consistently throughout? Thanks.

[Dubslow]

Originally Posted by bsquared

I don't quite have enough info to go on... could you email me your factor.log file, to see if there are any clues there? Also perhaps the poly file (the .job file). Were you running single threaded consistently throughout? Thanks.

Yes, only 1 thread. There's some more posts in the thread -- I have a specific qintsize specified after the previous C130 I did, where Batalov mentioned I'd do filtering less often if I specified that value.

factor.log has been emailed (along with a copy of nfs.job).

Notes on factor.log:
I originally ran the number with factor(), which I stopped during the nfs part; there's a second factor() with the same number, which is when I tested if doing "factor() -R" would continue the nfs part, which it didn't as you can see. Then I stopped that factor() and just used "nfs() -R" since.

nfs.job:

n: 182406447322336820309560461032830305181092209591614813564635719276441105985665782458025218176998282272069123864041991524112937073
skew: 591710.38
c0: 1528599633851371776329622734285
c1: 295884009843159380424326151
c2: -1406474204227932139749
c3: 458226357690021
c4: 3564267496
c5: 1860
Y0: -9961042320215041441491972
Y1: 39670776483097
rlim: 5900000
alim: 5900000
lpbr: 27
lpba: 27
mfbr: 54
mfba: 54
rlambda: 2.500000
alambda: 2.500000
qintsize: 200000

[bsquared]

Originally Posted by Dubslow

I have a specific qintsize specified after the previous C130 I did, where Batalov mentioned I'd do filtering less often if I specified that value.

This is the issue - I'm embarrased I didn't see it before when this discussion originally came up. The problem is that YAFU doesn't know about the new qintsize, so it keeps telling ggnfs to sieve much smaller ranges of special-q. When ggnfs actually goes off and sieves large ranges of special-q, you are in fact sieving the same regions multiple times. Hence the huge number of duplicates. Apologies again for the inefficient qintsize ranges that yafu currently uses - it is an easy fix but one I won't be able to get to for a couple more days. Until then, you'll just have to put up with the slightly more inefficient filtering schedule (or use a different tool...).

- b.

[Batalov]

So the resulting sieving pattern would look like stitches* - 20 millimeters forward, 12 millimeters back.

____________
*V.I.Lenin also had a similar paper called "One Step Forward Two Steps Back (The Crisis in Our Party)" :-)

[bsquared]

Originally Posted by Batalov

So the resulting sieving pattern would look like stitches* - 20 millimeters forward, 12 millimeters back.

____________
*V.I.Lenin also had a similar paper called "One Step Forward Two Steps Back (The Crisis in Our Party)" :-)

I had thought about trying to draw some sort of ASCII cartoon to depict what was going on, but stitches describes it pretty well .