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Old 2017-05-22, 11:41   #1
MartinC127
 
"Martin Christensen"
May 2017

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Default Problem restarting my exponent after computer update

I was double-checking an exponent (I don't remember precisely which one, but it starts with 45283), and at 3 A.M. this morning, my computer restarted for some Windows updates. When it did, prime95 started testing a different exponent, one starting with 45286. I tried unreserving that exponent, but the program went back to testing that same new one. How do I get back to the old exponent, which was about 27 percent completed?
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Old 2017-05-22, 16:14   #2
GP2
 
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Quote:
Originally Posted by MartinC127 View Post
I was double-checking an exponent (I don't remember precisely which one, but it starts with 45283), and at 3 A.M. this morning, my computer restarted for some Windows updates. When it did, prime95 started testing a different exponent, one starting with 45286. I tried unreserving that exponent, but the program went back to testing that same new one. How do I get back to the old exponent, which was about 27 percent completed?
It's 45283717 and the other one is 45286489. There are only 38 active assignments in the that range so they weren't hard to find.

Look in your worktodo.txt file (in the same directory where you installed Prime95), does it contain a line like "DoubleCheck=xxxxxxx...xxxxxxx,45283717,72,1" ? If so, it might be the second line rather than the first, in which case Prime95 will get to it eventually.

If not, check https://mersenne.org/workload/ (while logged in), and you will find the relevant "DoubleCheck=" line in the lower part of that page. Stop Prime95 (Test menu, "Stop..."), edit your worktodo.txt file to add the line back in, then restart Prime95 (Test menu, "Continue...").

PS, in the same directory as your worktodo.txt file and the Prime95 executable, there should be a save file named something like p5K283717, this stores the partially completed results. If that file is missing for whatever reason, then Prime95 will restart the exponent 45283717 from scratch at 0.0%, unfortunately.

Last fiddled with by GP2 on 2017-05-22 at 16:21
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Old 2017-05-23, 00:16   #3
MartinC127
 
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May 2017

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Thanks for the advice. Unfortunately, there was no entry in my worktodo.txt file referencing M45283717, nor was there a save file with those digits. There was, however, a line in worktodo referencing M45286489, as well as save files for that exponent. How can I un-unreserve the "new" exponent, or do I even need to? Since therre is no save file, I think it best to continue with the new exponent, which is already, 13 hours after it started computing, about 7 1/2 percent completed. The ETA line has been saying about six and a half more days to completion.
Will the computer (a MacBook Air running Windows 7 in a partition) repeatedly "forget" exponents every time it is restarted for updates from Windows? While testing the first exponent, I gave the machine a couple hours of rest by turning it off, and the exponent was resumed without problems when I turned the computer back on.
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Old 2017-05-23, 00:31   #4
kladner
 
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"Kieren"
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Quote:
Originally Posted by MartinC127 View Post
Thanks for the advice. Unfortunately, there was no entry in my worktodo.txt file referencing M45283717, nor was there a save file with those digits. There was, however, a line in worktodo referencing M45286489, as well as save files for that exponent. How can I un-unreserve the "new" exponent, or do I even need to? Since therre is no save file, I think it best to continue with the new exponent, which is already, 13 hours after it started computing, about 7 1/2 percent completed. The ETA line has been saying about six and a half more days to completion.
Will the computer (a MacBook Air running Windows 7 in a partition) repeatedly "forget" exponents every time it is restarted for updates from Windows? While testing the first exponent, I gave the machine a couple hours of rest by turning it off, and the exponent was resumed without problems when I turned the computer back on.
In this virtual Windows, do you have the Prime95 folder in Program Files or Program Files (x86)? If it is, there are problems with permissions which keep the program from writing files. Make sure that P95 in a non-system-designated folder.

Last fiddled with by kladner on 2017-05-23 at 00:32
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Old 2017-05-23, 01:39   #5
GP2
 
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Quote:
Originally Posted by MartinC127 View Post
Thanks for the advice. Unfortunately, there was no entry in my worktodo.txt file referencing M45283717, nor was there a save file with those digits. There was, however, a line in worktodo referencing M45286489, as well as save files for that exponent.
I'm not familiar with Mac OS, but on Windows you can search your entire hard drive for a file with a particular name. If that's possible on Mac OS, then see if there is a file named p5K283717 somewhere else on your hard drive, in some other directory. It's a faint hope, but worth a shot.
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