20110205, 11:45  #1 
Feb 2011
5 Posts 
GHzDays
On my account summary the sum of the GHzdays of the last 365 days is 267.
But when i look at the CPUsection the sum is above 300 GHz. (I´ve waited a few hours for updating but nothing happened.) 
20110205, 15:33  #2  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}×3×641 Posts 
Quote:
E.g., my own 365 day total on my account summary page is 833 GHzdays, but adding up the totals on my "Computer Details" table gives 3275 GHzdays. Last fiddled with by cheesehead on 20110205 at 15:45 

20110228, 16:58  #3 
Feb 2011
2 Posts 
Another GHzdays problem
Over the past several months it seemed that my results page displayed more GHzdays results than what was being added to my total under Top Producers. Now, over the past week, I've added 991.3 GHzdays when I added up my results (Feb 23Feb 28) yet my Top Producer total increased from 28910 to 29398, an increase of only 488, less than half.
In fact, I just moved my results over the past 365 days into a spreadsheed and added up my GHzdays: 29398. I've been a member since around 1999 and seem to be missing years of results being credited to my account. What can be done, if anything, to get my results over the years credited properly? 
20110228, 20:16  #4  
"Richard B. Woods"
Aug 2002
Wisconsin USA
17014_{8} Posts 
Quote:
Quote:
Top producers for the last year. So, on that page only the totals for the last 365 days are shown, not lifetime stats. The match with your results over the past 365 days is exactly what one would expect. That also explains why the addition of 991.3 GHzdays raised your (Last 365 Days) total by only 488 GHzdays  Apparently, 366 days or so ago you had reported 503 GHzdays. So 991 GHzdays were added to your past365days total, but 503 GHzdays became a morethan365daysago contribution, so were subtracted. Yours isn't the first misunderstanding we've had. I'll recommend that the subtitle on the Top Producers page be changed to: Top Producers During the Last 365 Days. so that it matches the time period description on the individual account result page ... and perhaps put it in bold lettering. Last fiddled with by cheesehead on 20110228 at 20:27 

20110228, 20:30  #5 
Feb 2011
2 Posts 
That explains it...and puts my "lifetime" GHzDays to 63841. I guess I'm glad that I'm not the only one to miss it. Thank you for the clarification!

20110409, 18:08  #6 
2×3×983 Posts 
high GHz days
I was wondering if there was an easytounderstand explanation of how a user gets 23GHz days from ONE trial factor (or more accurately, 92 from 4 TFs)
I've seen some wildly high numbers in P1 as well. (pardon hijak, but first GHz days thread available) k 
20110409, 19:36  #7 
P90 years forever!
Aug 2002
Yeehaw, FL
7319_{10} Posts 

20110409, 19:42  #8  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
10AB_{16} Posts 
Quote:
Note that since factors of Mersenne numbers must be of the form 2kp+1 where p is the exponent and k is any integer over 0, the larger the exponent is, the fewer possible factors there are to check in a given bit range. For example, with p=4M, factoring from 2^69 to 2^70 takes about 30 GHzdays, and with p=332M, (which is ~100M digits) 2^75 to 2^76 is about 23 GHzdays. Even though the factors are larger in the latter case, there's fewer to check than in the first case because they're spaced out over multiples of 332,000,000 instead of 4,000,000. Without further details of the boundaries of the tests, I can't give a more exact answer. These pages might interest you: http://mersennearies.sili.net/credit.php http://mersennearies.sili.net/factorbits.php Last fiddled with by MiniGeek on 20110409 at 19:44 

20110409, 20:39  #9 
Apr 2010
Over the rainbow
4732_{8} Posts 
to give you an example, with a gtx460, running an exponent of the billion digits project from 81 to 82 bits take me 48 hours of constant running (and i'm cpu bound).
it would be equal to 147.424382 GHzday . for just one exponent (see minigeek link) 
20110409, 21:08  #10 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
10010000000111_{2} Posts 
That is about what one would get taking an exponent in the 332,000,000 range from 75 to 76. It is 5.7 from 73 to 74.

20110409, 21:37  #11 
Apr 2010
Over the rainbow
9DA_{16} Posts 
I realize that my above post is not really understandable.
In 48 hours, thanks to mfaktc, I TF'ed M3 321 928 241 from 81 to 82 bits. This would grant me about 147 GHzday. All that in less than 48 hours (and i'm CPU bound). 
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