mersenneforum.org  

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

Reply
 
Thread Tools
Old 2011-10-23, 22:20   #727
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

2·5·353 Posts
Default

Quote:
Originally Posted by bcp19 View Post
I thought P-1 was only supposed to use 90% of available memory
Prime95 will only let you allocate up to 90% of your system memory, but it will use 100% of what you allocate to it where possible (it might not be possible to use every last MB since it's allocated in discrete chunks depending how many relative primes are being processed).
James Heinrich is online now   Reply With Quote
Old 2011-10-23, 22:35   #728
Mr. P-1
 
Mr. P-1's Avatar
 
Jun 2003

7×167 Posts
Default

Quote:
Originally Posted by bcp19 View Post
I thought P-1 was only supposed to use 90% of available memory, which would kinda explain why at 112MB available it uses 92M, but doesn't explain the use of 112MB at 113MB available...
Earlier versions of the client would never use all the memory you allowed it, but I haven't seen this behaviour for a long time now. Even if it did, it should decide to do stage 2 with a certain amount of memory avaiable, then be unable to do it with that amount of memory.

Last fiddled with by Mr. P-1 on 2011-10-23 at 22:38
Mr. P-1 is offline   Reply With Quote
Old 2011-10-23, 22:43   #729
Mr. P-1
 
Mr. P-1's Avatar
 
Jun 2003

49116 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
Prime95 will only let you allocate up to 90% of your system memory, but it will use 100% of what you allocate to it where possible (it might not be possible to use every last MB since it's allocated in discrete chunks depending how many relative primes are being processed).
You can put any amount of memory, even > 100%, into local.txt and have it "use" that when calculating P-1 bounds. Of course, you must ensure that it never actually goes to stage 2 in this condition. I do this on my secondary machine, which only has 256MB of physical memory. I use LowMemWhileRunning=prime95 to stop it from going to stage 2.

Every once in a while I shift the accumulated stage-2-ready assignments to my main box.
Mr. P-1 is offline   Reply With Quote
Old 2011-10-24, 12:16   #730
nucleon
 
nucleon's Avatar
 
Mar 2003
Melbourne

5×103 Posts
Default

Any progress on P-1 on GPUs?

P-1 loves ram - most top end cards have >=1GB
P-1 loves fast ram - somewhat modest GTX560Ti - 52.61GB/s (beats definitely not modest SNB-E quad channel theoretical max of 51.2GB/s)

Anything on the drawing board?

-- Craig
nucleon is offline   Reply With Quote
Old 2011-10-24, 15:33   #731
Jwb52z
 
Jwb52z's Avatar
 
Sep 2002

3·269 Posts
Default

Is there any way to get a more accurate credit for the P-1s? I am asking because I only do 1 P-1 at a time and have a handful always queued up to start. For some reason, even though each P-1 only takes a bit over a day to compute, the credit given to me is several days worth as if it's crediting the time the P-1 tests are sitting there unprocessed. I feel like it's an unforseen cheat that isn't on purpose by the user.
Jwb52z is offline   Reply With Quote
Old 2011-10-24, 15:52   #732
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

353010 Posts
Default

The credit given is based on the difficulty of the assignment alone, it doesn't matter how long you've had the assignment. GHz-days is what credit is given in, and that's how many days it would take to complete the assignment on a 1.0GHz single-core Intel Core² CPU. Your CPU is likely more powerful and can complete a (for example) 4GHz-days assignment in one day.
James Heinrich is online now   Reply With Quote
Old 2011-10-24, 21:41   #733
Jwb52z
 
Jwb52z's Avatar
 
Sep 2002

3×269 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
The credit given is based on the difficulty of the assignment alone, it doesn't matter how long you've had the assignment. GHz-days is what credit is given in, and that's how many days it would take to complete the assignment on a 1.0GHz single-core Intel Core² CPU. Your CPU is likely more powerful and can complete a (for example) 4GHz-days assignment in one day.
Thank you for explaining it. Just FYI personally, I have an i7 Q720 1.6 GHz quad core.
Jwb52z is offline   Reply With Quote
Old 2011-10-24, 21:53   #734
Christenson
 
Christenson's Avatar
 
Dec 2010
Monticello

5·359 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
The credit given is based on the difficulty of the assignment alone, it doesn't matter how long you've had the assignment. GHz-days is what credit is given in, and that's how many days it would take to complete the assignment on a 1.0GHz single-core Intel Core² CPU. Your CPU is likely more powerful and can complete a (for example) 4GHz-days assignment in one day.
James:
Mr P-1 seems to have found a problem where he gets a different amount of credit depending on manual or automatic submission.
E
Christenson is offline   Reply With Quote
Old 2011-10-24, 22:10   #735
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

2×5×353 Posts
Default

Quote:
Originally Posted by Christenson View Post
Mr P-1 seems to have found a problem where he gets a different amount of credit depending on manual or automatic submission.
Yes, there are apparently some issues there, and I'll try and have a look as to why that's happening. But that's a bug in the manual results submission code somewhere, and it'll be several weeks before I can try and track that down.
James Heinrich is online now   Reply With Quote
Old 2011-10-24, 22:12   #736
Dubslow
Basketry That Evening!
 
Dubslow's Avatar
 
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

160658 Posts
Default

Didn't P95 say that was due to a lack of FFT size information? Or is this something else I missed?
Dubslow is offline   Reply With Quote
Old 2011-10-25, 02:34   #737
kladner
 
kladner's Avatar
 
"Kieren"
Jul 2011
In My Own Galaxy!

2×3×1,693 Posts
Default CPU cycles available for P-1

To whom it may concern (Mr. P-1,etc.):

I am currently running 3 1090T cores on P-1. 2 cores are feeding mfaktc on a GTX 460. (But that belongs in another thread.) 1 core is cleaning up the LL assignments which I moved from the other cores. In Win7-64 I have 8GB RAM, so I can handle giving fully adequate amounts to 4 cores once the LL's finish.

I have been taking whatever PrimeNet gives me in the P-1 department, without changing the depth.

I would gladly accept assignments from other sources, if it would be helpful.
kladner is offline   Reply With Quote
Reply

Thread Tools


All times are UTC. The time now is 00:26.


Thu Dec 2 00:26:40 UTC 2021 up 131 days, 18:55, 1 user, load averages: 1.00, 1.14, 1.05

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.