20120126, 00:07  #23 
If I May
"Chris Halsall"
Sep 2002
Barbados
2×5,647 Posts 

20120126, 00:31  #24  
"Jerry"
Nov 2011
Vancouver, WA
1,123 Posts 
Quote:
So when I rechecked, it's actually about 19 days. So, here are the bounds it's using: Code:
[Jan 24 23:08] Assuming no factors below 2^77 and 2 primality tests saved if a factor is found. [Jan 24 23:08] Optimal bounds are B1=4070000, B2=133292500 [Jan 24 23:08] Chance of finding a factor is an estimated 6.41% [Jan 24 23:08] Using Core2 type3 FFT length 22400K, Pass1=3584, Pass2=6400, 4 threads Last fiddled with by flashjh on 20120126 at 00:32 

20120126, 01:04  #25  
"Kieren"
Jul 2011
In My Own Galaxy!
10158_{10} Posts 
Quote:
Then there's Jerry's monster machine, using 20779MB and 960 RP. I suppose, in some ways the questions have been roughly answered. I remember somewhere Xyzzy mentioned certain thresholds of memory resulting in E=6 or E=12 BS extension values. 

20120126, 01:10  #26  
"Kieren"
Jul 2011
In My Own Galaxy!
2·3·1,693 Posts 
Quote:
EDIT: These RAM amounts are roughly the same as what I have allocated to 2 HighMemWorkers. I recently reduced that from 3, but so far, this has not changed the BS extension values. I consistently hit E=6, but never higher, at least so far. Then there's Jerry's monster machine, using 20779MB and 960 RP. I suppose, in some ways the questions have been roughly answered. I remember somewhere Xyzzy mentioned certain thresholds of memory resulting in E=6 or E=12 BS extension values. Last fiddled with by kladner on 20120126 at 01:10 

20120126, 02:04  #27 
"James Heinrich"
May 2004
exNorthern Ontario
1000010001010_{2} Posts 
For what it's worth, on my good system I get:
Code:
Optimal P1 factoring of M52686883 using up to 10000MB of memory. Assuming no factors below 2^72 and 2 primality tests saved if a factor is found. Optimal bounds are B1=520000, B2=10790000 Chance of finding a factor is an estimated 4.02% Using Core2 type3 FFT length 2800K, Pass1=448, Pass2=6400, 2 threads Setting affinity to run helper thread 1 on logical CPU #8 Restarting worker with new memory settings. Available memory is 9500MB. Using 9497MB of memory. Processing 412 relative primes (0 of 432 already processed). For what it's worth, I get E=12 on everything in this range. 
20120126, 02:14  #28 
"Kieren"
Jul 2011
In My Own Galaxy!
2×3×1,693 Posts 
Thanks, James. I'll have to collect some results on my machine and make some comparisons. I take it from "...that other 32GB of RAM...." that you're currently scraping by with only 32GB.
I'm considering getting mine from 8 to 16GB at the moment. It's only $6070. It does seem it would make some difference. I can still get the identical Corsair modules. I'm not sure if it would force slower timings, though. 
20120126, 05:14  #29 
"Kieren"
Jul 2011
In My Own Galaxy!
2×3×1,693 Posts 
I think that the change to MaxHighMemWorkers=2 has started to show results. The latest Stage 2 worker is now showing 480 relative primes. The perworker allocation has gone up. Of course, this is with the Night time settings, since it is after 2300 local: my night break point.

20120126, 12:53  #30 
"James Heinrich"
May 2004
exNorthern Ontario
2·29·73 Posts 

20120126, 14:23  #31 
"Kieren"
Jul 2011
In My Own Galaxy!
2·3·1,693 Posts 
Thanks. Yes, indeed I am already seeing "Looking for work that uses less memory." At the current rate of backlog it seems that catchup sessions will have to be allowed every few days to a week.

20120126, 14:59  #32  
Oct 2011
1010100111_{2} Posts 
Quote:


20120126, 16:09  #33  
"Kieren"
Jul 2011
In My Own Galaxy!
2·3·1,693 Posts 
Quote:


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