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-   -   A couple of largish numbers (https://www.mersenneforum.org/showthread.php?t=15450)

fivemack 2011-03-24 15:21

A couple of largish numbers
 
I have been working on various sequences below 10^4 for a couple of years now.

3270.632 is a C170 on which I've done 16000 curves at 3e7
3678.3076 is a C162 on which I've done 20000 curves at 3e7

I have the resources to do these GNFS jobs, but not really the interest; if anyone else wants to pick up the sequences, they're welcome to them

debrouxl 2011-03-24 18:36

A C162 is within the reach of RSALS.
But someone else would need to perform the polynomial selection: my 8 cores, on 3 computers, are currently busy with preparatory ECM work @ B1=43e6 and polynomial selection for RSALS, and some work for another BOINC-based project :smile:

Syd 2011-03-24 21:33

I could do the poly selection for 3678.3076, would take me a few days to get a good one.

edit:
I'll just start it. 5 cores without cuda, one with GTX260. I'll post results here later.

Syd 2011-03-25 09:36

so far: found an outstanding poly,

[CODE]# norm 1.253170e-15 alpha -8.532833 e 1.271e-12 rroots 5
skew: 133435193.68
c0: 9278864245525985137550344687245446069980225
c1: 180109282635950772896812489720834585
c2: -8995871353090924335725511063
c3: -17784552123636433957
c4: 552333312806
c5: 540
Y0: -45655070065487497189556645317254
Y1: 180378937982427677
[/CODE]

second best is 1.063e-12

debrouxl 2011-03-28 04:34

I'll queue this polynomial onto RSALS in the next few hours.

debrouxl 2011-03-28 17:24

I have queued to RSALS the C162 from sequence 3678, with Syd's poly, over the 15M-55M range for now. There's room for a team sieving here :wink:

debrouxl 2011-03-30 06:20

Raising the upper limit to 65M, one quarter of the 15M-65M range returned so far.
Forecast number of raw relations (over-estimated, due to simple linear projection): 81M.
Could someone give an estimation of how many raw relations are needed ? :smile:

debrouxl 2011-03-31 17:24

I have raised the upper limit to 80M, and forced the generation of all WUs. ~54% of the 15-80M range has been returned so far, yielding a projection of ~113M raw relations.

debrouxl 2011-04-02 10:31

~83% of the results returned so far, ~115M raw relations expected. WUs near q=15M give lower yields than WUs at e.g. q=40M, which is infrequent.

We're currently seeing a low point in sieving activity on the grid, so I won't be participating in further team sievings until the activity raises.

Syd 2011-04-02 11:05

[QUOTE=debrouxl;257362]~83% of the results returned so far, ~115M raw relations expected. WUs near q=15M give lower yields than WUs at e.g. q=40M, which is infrequent.

We're currently seeing a low point in sieving activity on the grid, so I won't be participating in further team sievings until the activity raises.[/QUOTE]

Maybe you can increase that activity by granting more credits to your users. Currently you grant less than average per CPU-hour, not taking the memory usage into account.

[URL="http://allprojectstats.com/cpuinfo.php?id=47029"]http://allprojectstats.com/cpuinfo.php?id=47029[/URL]

xilman 2011-04-02 17:55

[QUOTE=Syd;257364]Maybe you can increase that activity by granting more credits to your users. Currently you grant less than average per CPU-hour, not taking the memory usage into account.

[URL]http://allprojectstats.com/cpuinfo.php?id=47029[/URL][/QUOTE]Sounds like an invitation to an inflationary arms race to me...

Paul


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