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Old 2021-01-22, 10:12   #1
drkirkby
 
"David Kirkby"
Jan 2021
Althorne, Essex, UK

32·11 Posts
Default How can I move work to a new OS on the same computer?

I'm doing a probable prime (PRP) test with the exponent 110068781


https://www.mersenne.org/report_expo...0068781&full=1


B1=663000, B2=8016000


I don't understand what the B1 and B2 are, but that's not my main However, if someone can point me to a link which explains the significance of B1 and B2, I would be pleased to see it.



This computer is running CentOS 7.9, but I need to change to CentoOS 7.8 to run a specific bit of software, so a downgrade is necessary. I have installed the older OS on another physical disk drive, which allows me to dual-boot the computer, but the hostname, kernel version, operating system version will all be different, and perhaps the MAC address too - not sure about that one.

I can keep the computer on 24 hours per day, but I can't keep it running CentOS 7.9 24 hours per day - perhaps 12 hours is more reasonable.

What's the best thing to do? I can think of a few options

1) Install mprime on the older 7.8 system, grab a new exponent, and run that 12 hours per day, switching back to the 7.9 system for the other 12 hours. So I'm doing two exponents on the one physical computer, but not simultaneously.

2) Don't run mprime on the system I downgraded to 7.8, just on the 7.9 system. That seems less effective, as then I can't run 24 hours per day.

3) Move the job from the 7.9 system to the 7.8 system. That would suite me best, but I don't know how to do it, and I don't know if you would want me to do it. Potentially if there was a bug in one operating system, but not the other, a problem could occur.

The CPUs and RAM will not change of course.
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Old 2021-01-22, 10:36   #2
axn
 
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Quote:
Originally Posted by drkirkby View Post
However, if someone can point me to a link which explains the significance of B1 and B2, I would be pleased to see it.
https://www.mersenne.org/various/math.php#p-1_factoring
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Old 2021-01-22, 10:40   #3
axn
 
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You can create a shared folder and run mprime off of it. Only prime.txt, local.txt, worktodo.txt (and the checkpoint files) need to be in the shared folder.

You can then use the -w parameter while running mprime to point to the shared folder.

That way, you can run same assignment regardless of the OS. This can even work if you're dual-booting Windows and Linux.

Last fiddled with by axn on 2021-01-22 at 10:41
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Old 2021-01-22, 11:48   #4
drkirkby
 
"David Kirkby"
Jan 2021
Althorne, Essex, UK

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Quote:
Originally Posted by axn View Post
You can create a shared folder and run mprime off of it. Only prime.txt, local.txt, worktodo.txt (and the checkpoint files) need to be in the shared folder.

You can then use the -w parameter while running mprime to point to the shared folder.

That way, you can run same assignment regardless of the OS. This can even work if you're dual-booting Windows and Linux.

You mean like on a USB stick? I'm not keen to mount one file system from one OS onto the other. Is a USB stick fast enough - I don't know how much use you make of disk - I assume very little.
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Old 2021-01-22, 14:23   #5
axn
 
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USB stick can work, but is not advisable -- not because of speed, but because of additional wear & tear. How much writes happen depends on the save frequency (which you can customize).

External HDD/SSD would be better.

However, I was thinking of mount one file system from one OS onto the other. You designate a shared folder in one of the partitions and then setup a boot script to mount it, and you're all done.

Anyways, something worth considering.
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Old 2021-01-22, 16:52   #6
drkirkby
 
"David Kirkby"
Jan 2021
Althorne, Essex, UK

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Quote:
Originally Posted by axn View Post
USB stick can work, but is not advisable -- not because of speed, but because of additional wear & tear. How much writes happen depends on the save frequency (which you can customize).

External HDD/SSD would be better.

However, I was thinking of mount one file system from one OS onto the other. You designate a shared folder in one of the partitions and then setup a boot script to mount it, and you're all done.

Anyways, something worth considering.

Thank you. I seem to have gotten myself in trouble, but that's a subject of another post.
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