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#1 |
Aug 2002
43×199 Posts |
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Background:
http://mathworld.wolfram.com/HomePrime.html http://www.worldofnumbers.com/topic1.htm The attached text file contains the number to be factored... I start it like this: [pre]cat hp.txt | nohup nice -19 ecm -c 0 -k 10 11e7 >> hp.log &[/pre] With the default k, it needs 398MB for stage 2... Set k to 10 and it uses 283MB... I think setting k to 20 would make it use 199MB... With k set to 10, stage 2 is 8% slower... I have 512MB of memory so I am able to run it with the default k, but only if I am not doing anything else... Setting k to 10 seems like a good compromise... Too bad there isn't a way to run the stage 2 part at night when I am asleep... According to the web page linked above, all the curves below 55 digits have been done... We need 22,000 curves at this depth... On my 2.4GHz K8, it takes about 53 minutes per curve with k=10... |
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#2 | |
"Nancy"
Aug 2002
Alexandria
2,467 Posts |
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cat hp.txt | nohup nice -19 ecm -c 0 -save hp49.110M.ecm 11e7 1 >> hp.log & You may want to set the curve number (-c) to a value so that the stage 1 runs finish before you go to bed. You can also kill the process, but the curve currently in progress will be lost. Then run stage 2 over night: nohup nice -19 ecm -resume hp49.110M.ecm 11e7 >> hp.log & Stage 1 uses almost no memory so it shouldn't interfere with your regular use of the computer much. When stage 2 is done on all residues in the hp49.110M.ecm file, you should delete it before doing more stage 1 the next day. Gmp-ecm 5.0 does not overwrite or append to existing files. Alex |
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#3 |
"Mark"
Apr 2003
Between here and the
696910 Posts |
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I've been using Home Primes (up to 1000) to set the new ECMNet Client/Server. Unforuntately, my server is behind a firewall. If you want to set up the ECMNet Server to manage the curves run I can send you the source for 2.5. You can either use it privately or you can let others know the IP and port to grab work from. BTW, I have run 1 P-1 and 3 P+1 curves at 11e7 and one P-1 at 26e7.
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#4 |
Aug 2002
43·199 Posts |
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25 curves using B1=110000000 & B2=680270182898...
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#5 |
Dec 2003
Hopefully Near M48
2·3·293 Posts |
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Whoa, looks like Akruppa has already factored several large factors in the HP49 sequence. How long have you been working on step 100? How does that compare with how long it took to factor large composites on previous steps?
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#6 |
Aug 2002
100001011011012 Posts |
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Yeah, I found that page after reading akruppa's list of work he has done... Very impressive stuff!
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#7 | |
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
2×73×17 Posts |
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Alex and I worked on that sequence for several years before giving up for a while. Paul |
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#8 |
"Nancy"
Aug 2002
Alexandria
2,467 Posts |
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HP49 is how Paul and I learned the ropes of GNFS. I guess we invested a total of about 5-6 Athlon GHz years in the various factorizations. The most expenstive factorization was HP49(95), a c153 we did with GNFS. That GNFS took about 1.5 GHz years, but we did a lot of ECM on the composite first. For the c204 of HP49(100), we've done the 5500 curves at B1=11M and 9000 curves at B1=44M listed on Patrick's page, which also took over a GHz year.
Alex |
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#9 | |
Aug 2002
43×199 Posts |
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![]() I saw you there too! I just forgot to mention it... Sorry! |
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#10 |
Mar 2003
New Zealand
13·89 Posts |
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On my 2.9GHz P4 one curve takes 103 minutes (3821 sec. stage 1, 2362 sec. stage 2), nearly twice as long as Xyzzy's K8 3400+
![]() I also did stage 1 on a P3 600MHz which took 19484 sec., about the same per clock as the P4. I don't have enough memory in the P3 to do stage 2. Both times are with gmp-ecm 5.0.3 and libgmp 4.1.4 optimised for each machine. |
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#11 |
Aug 2002
43·199 Posts |
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139 curves using B1=110000000 and B2=680270182898...
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Thread | Thread Starter | Forum | Replies | Last Post |
P-1 on M1061 and HP49.99 | ATH | Factoring | 21 | 2009-10-13 13:16 |