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Old 2011-02-27, 14:46   #133
Jeff Gilchrist
 
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Quote:
Originally Posted by Prime95 View Post
You can put the known factor 3 on the worktodo.txt line.
In the docs it says the format is
Pminus1=k,b,n,c,B1,B2

Is that an undocumented option even in the undoc.txt file?

So if I have:

Pminus1=1,2,8126149,1,11000,0

Where do I put the factor? I can't see to find an info in the docs.

Jeff.
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Old 2011-02-27, 15:30   #134
Uncwilly
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Quote:
Originally Posted by Jeff Gilchrist View Post
In the docs it says the format is
Pminus1=k,b,n,c,B1,B2

Where do I put the factor? I can't see to find an info in the docs.
Pminus1=k,b,n,c,B1,B2[,B2_start][,"factors"]

Last fiddled with by Uncwilly on 2011-02-27 at 15:31
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Old 2011-02-27, 17:52   #135
Jeff Gilchrist
 
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Quote:
Originally Posted by Uncwilly View Post
Pminus1=k,b,n,c,B1,B2[,B2_start][,"factors"]
Thank you, I tried without the quotes when guessing what the format was and it caused mprime to segfault. The quotes seems to be working.

Jeff.
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Old 2011-02-28, 11:26   #136
Jeff Gilchrist
 
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That seems to be working well. I had another question.

The mprime output has this at the end:
Code:
, E=6, We8: D2C6C8E9
While the Windows Prime95 version is different:
Code:
, We4: D4BDB047
What does the E=6 mean, and why is one We8 while the other is We4?

Thanks,
Jeff.
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Old 2011-02-28, 13:00   #137
James Heinrich
 
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Quote:
Originally Posted by Jeff Gilchrist View Post
What does the E=6 mean, and why is one We8 while the other is We4?
We4, We1, We8, etc are just shorthand version numbers of the software used.

E=6 (can also be other numbers, such as E=12, or possibly 1, 2, or 4) indicate that enough RAM was allocated to make the use of the "Brent-Suyama Extension" which can provide a slight boost to the chance of finding a factor if a relatively large amount of RAM is available. It doesn't add a whole lot, so it's not a really big deal if it's not there. Larger values are "better" (E=12 is "better" than E=6, E=6 is "better" than nothing).

This thread contains some more questions & answers about P-1 that may be of interest to you.
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Old 2011-02-28, 17:48   #138
James Heinrich
 
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Quote:
Originally Posted by Uncwilly View Post
Pminus1=k,b,n,c,B1,B2[,B2_start][,"factors"]
That's in whatsnew.txt but missing from readme.txt -- can it be updated there please?
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Old 2011-03-01, 02:11   #139
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Quote:
Originally Posted by Prime95 View Post
Try reducing memory allocation in prime95 to 3GB. It is possible 6GB is causing thrashing.
I've done some checking, and reducing the memory to 3GB only changed the time from about 3300 seconds, to about 3100. So no significant difference there, so I moved it back up to 6GB because at 3GB, it increased B1 and decreased B2, slightly.

I think I'll move the P-1 off of this machine, change it to another LL, and change (2) LL's, on my other machines to (2) P-1's. That will give me (4) P-1's total, instead of (3).

Doug
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Old 2011-03-01, 06:13   #140
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The new release is incredible... particularly on exponents above 49M or so.

Previously... exponents below this were at 92 ms per iteration on the LL and are now at 80-85 ms and sometimes as low as 75 ms.

HOWEVER, exponents above this mark were previously at 119ms and are now down to about 89 (or lower) ms. This is an incredible boost in performance. Thank you!

Last fiddled with by Primeinator on 2011-03-01 at 06:13
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Old 2011-03-01, 19:38   #141
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Default mprime on Ubuntu 9.04 32-bit

Quote:
Originally Posted by Prime95 View Post
I had an old Ubuntu 9.04 64-bit CD lying around. I installed that and built a new 64-bit mprime. Download it and give it a try.
Hello, I have Ubuntu 9.04 32-bit and I am seeing this with the v26.5 mprime:

> ./mprime -d
./mprime: /lib/tls/i686/cmov/libc.so.6: version `GLIBC_2.11' not found (required by ./mprime)

In the meantime I have downloaded mprime2511.tar.gz from the ftp site and that seems to work ok.

To update to v26.5, do I have to compile it myself? Unfortunately updating to a newer version of Ubuntu isn't an option yet for me.

Regards, Timbit.
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Old 2011-03-02, 16:45   #142
Prime95
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Quote:
Originally Posted by timbit View Post
./mprime: /lib/tls/i686/cmov/libc.so.6: version `GLIBC_2.11' not found (required by ./mprime)
Try downloading again. I found a 32-bit Ubuntu 9.04 download. I rebuilt mprime using that Ubuntu version.
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Old 2011-03-02, 22:38   #143
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Quote:
Originally Posted by Prime95 View Post
Try downloading again. I found a 32-bit Ubuntu 9.04 download. I rebuilt mprime using that Ubuntu version.
It works! Thanks for the quick turn-around time!

Cheers!
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