mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Software

Reply
 
Thread Tools
Old 2021-04-05, 15:15   #133
axn
 
axn's Avatar
 
Jun 2003

22·52·72 Posts
Default

I suspect that on a local system, you wouldn't be able to tell the difference. But anyways, George will have to confirm if this is even possible or not.
axn is online now   Reply With Quote
Old 2021-04-05, 20:20   #134
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

3×2,467 Posts
Default

Quote:
Originally Posted by axn View Post
George, Would it be possible to reduce the size of P-1 stage 2 checkpoint files? Using this with colab / google drive, it takes a very long time to stop/restart during stage 2 - it writes 100-200 MB of save file. I am guessing it is somehow saving the stage 2 prime bitmap or something? I think it would be faster to recompute the state, rather than load it from disk (with google drive).
Theoretically possible but I'm very afraid I'd make a mistake. Even the most subtle change in initial state can affect how the primes are paired.

You might try MaximumBitArraySize=n in prime.txt. This limits the maximum bit array size to n MB (default is 250). This will have some negative impact on performance, make a few runs yourself to see if it is significant.
Prime95 is online now   Reply With Quote
Old 2021-04-09, 06:31   #135
axn
 
axn's Avatar
 
Jun 2003

22·52·72 Posts
Default

Quote:
Originally Posted by Prime95 View Post
You might try MaximumBitArraySize=n in prime.txt. This limits the maximum bit array size to n MB (default is 250). This will have some negative impact on performance, make a few runs yourself to see if it is significant.
Is it safe to change this in the middle of a Stage 2 run?
axn is online now   Reply With Quote
Old 2021-04-09, 16:06   #136
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

3·2,467 Posts
Default

Quote:
Originally Posted by axn View Post
Is it safe to change this in the middle of a Stage 2 run?
Probably. Never tested.
Prime95 is online now   Reply With Quote
Reply

Thread Tools


All times are UTC. The time now is 02:14.

Sun Apr 11 02:14:09 UTC 2021 up 2 days, 20:55, 1 user, load averages: 1.55, 1.64, 1.59

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.