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2012-01-10, 15:50
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#67 |
Jun 2003
13DA16 Posts |
Code:
p=55204091[@76 bits/B1=B2=405000] B1=410000, B2=7175000, prob= 1.31 p=55098229[@75 bits/B1=B2=460000] B1=420000, B2=7980000, prob= 1.45 p=55197041[@75 bits/B1=B2=460000] B1=420000, B2=7980000, prob= 1.45 p=55835839[@75 bits/B1=B2=470000] B1=440000, B2=8250000, prob= 1.48 p=45571601[@72 bits/B1=B2=510000] B1=390000, B2=8677500, prob= 1.82 p=46130221[@72 bits/B1=B2=515000] B1=390000, B2=8775000, prob= 1.83 p=46207093[@72 bits/B1=B2=520000] B1=390000, B2=8775000, prob= 1.82 p=47324509[@72 bits/B1=B2=525000] B1=405000, B2=8910000, prob= 1.85 p=54258847[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476567[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476573[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476593[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476663[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476833[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54476861[@74 bits/B1=B2=525000] B1=420000, B2=8715000, prob= 1.56 p=54680371[@74 bits/B1=B2=525000] B1=430000, B2=8815000, prob= 1.58 p=54698719[@74 bits/B1=B2=525000] B1=430000, B2=8815000, prob= 1.58 p=54698759[@74 bits/B1=B2=525000] B1=430000, B2=8815000, prob= 1.58 p=54847097[@74 bits/B1=B2=525000] B1=440000, B2=8910000, prob= 1.60 p=55072681[@74 bits/B1=B2=530000] B1=440000, B2=8910000, prob= 1.59 p=48091517[@72 bits/B1=B2=555000] B1=400000, B2=9000000, prob= 1.81 p=48099379[@72 bits/B1=B2=555000] B1=405000, B2=9011250, prob= 1.82 p=49232621[@72 bits/B1=B2=560000] B1=420000, B2=9450000, prob= 1.87 p=49235027[@72 bits/B1=B2=560000] B1=420000, B2=9450000, prob= 1.87 p=49304473[@72 bits/B1=B2=560000] B1=420000, B2=9450000, prob= 1.87 p=45018373[@72 bits/B1=B2=565000] B1=340000, B2=7990000, prob= 1.62 p=45434309[@71 bits/B1=B2=570000] B1=400000, B2=9700000, prob= 2.02 p=46218209[@72 bits/B1=B2=575000] B1=365000, B2=8668750, prob= 1.71 p=46262267[@72 bits/B1=B2=575000] B1=370000, B2=8695000, prob= 1.72 p=46665911[@72 bits/B1=B2=580000] B1=370000, B2=8695000, prob= 1.71 p=46780159[@71 bits/B1=B2=580000] B1=430000, B2=10105000, prob= 2.08 p=54440039[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54440083[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54440291[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54440369[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54440389[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54442631[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54442643[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54444287[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54444323[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54444373[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54475163[@73 bits/B1=B2=580000] B1=450000, B2=9900000, prob= 1.77 p=54627889[@73 bits/B1=B2=580000] B1=455000, B2=9896250, prob= 1.77 p=54628121[@73 bits/B1=B2=580000] B1=455000, B2=9896250, prob= 1.77 p=54629101[@73 bits/B1=B2=580000] B1=455000, B2=9896250, prob= 1.77 p=50249491[@72 bits/B1=B2=585000] B1=430000, B2=9675000, prob= 1.88 p=50377819[@72 bits/B1=B2=585000] B1=430000, B2=9675000, prob= 1.88 p=54758579[@73 bits/B1=B2=585000] B1=450000, B2=9900000, prob= 1.76 p=50575991[@72 bits/B1=B2=590000] B1=430000, B2=9782500, prob= 1.88 p=54846683[@73 bits/B1=B2=595000] B1=450000, B2=9900000, prob= 1.75 EDIT:- Ooh... I forgot a rather giant caveat. This is best-case calculation assuming you've allocated enough memory for 485 temporary. For these exponents, that means somewhere around 12GB!! Last fiddled with by axn on 2012-01-10 at 16:02 Reason: Memory |
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2012-01-10, 15:52
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#68 | |
Oct 2011
Maryland
4428 Posts |
Quote:
I was only saying that since we are not, only doing P-1 Stage 1 helps the project. |
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2012-01-10, 15:54
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#69 | |
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If I May
"Chris Halsall"
Sep 2002
Barbados
9,767 Posts |
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2012-01-10, 15:58
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#70 | |
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Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88
3·29·83 Posts |
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2012-01-10, 16:06
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#71 | |
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Jun 2003
2×3×7×112 Posts |
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2012-01-10, 17:22
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#72 | |
Jun 2010
Pennsylvania
2×467 Posts |
Quote:
Regarding statistics as to the percentage of machines that can or can't do something -- well, I've been asking if statistics of this kind are publicly available, and thus far nobody has indicated so. (I'd still be happy to be pointed to the data.) So as far as I can tell there is no basis, one way or the other, for making claims as to how many or what proportion of users may or may not be affected by changes. Now as far as increasing users' P-1 memory allocation: We were asked to provide an e-mail address when first registering on PrimeNet. How about sending out a circular briefly describing the situation and the hoped-for improvement, and then asking users to consider upping their allocations if they haven't already done so. This should not be difficult to do, and it could have a bigger and more immediate impact on P-1 than changing the default value on a future Prime95 release. Rodrigo |
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2012-01-10, 18:27
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#73 | ||
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Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88
3·29·83 Posts |
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Quote:
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2012-01-10, 18:28
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#74 |
Feb 2004
101000002 Posts |
What I don't get about this default setting is how unhelpful it is.
Putting my newbie hat here. When I install something, I expect that the program will choose default that will permit it to run properly or within certain parameter. If I get a dialog box, I will choose the default (I wouldn't want to make mistake!). You know how people install software? Join GIMPS!->OK->OK-> Code:
--------------------------- Prime95 --------------------------- You have left the available memory fields at 8 megabytes. You can increase your chances of finding a Mersenne prime very slightly if you let the program occasionally use more memory. The readme.txt file has more information. Do you want to let the program use more memory? --------------------------- Yes No --------------------------- No one reads anything, or they deffer the reading for later and never get to it. Now to the unhelpful part. 1) Why choose 8MB? it's worse than 0MB, at least with 0MB I have a hint that something is wrong. but with 8MB it looks like a good value from the user standpoint, but little does he know that it is far from the required amount for ANY P-1! 2) I just choose yes to the question: Do you want to let the program use more memory? Let's please fill the default with a bare minimum that will let the program work! Lets not leave it at the ALWAYS unhelpful value of 8MB. 3) Then the question refers to the readme.txt file: Code:
Exponent Minimum Reasonable Desirable -------- ------- ---------- --------- 20000000 40MB 80MB 120MB 33000000 65MB 125MB 185MB 50000000 85MB 170MB 250MB Why not put a chart in the dialog box with the following: For (insert current wavefront exponent) 0MB - P-1 Unavailable 497MB - P-1 Minimum 12,096MB - P-1 Maximum 59,282MB - P-1 Insane Note: MB values taken from here Last fiddled with by diamonddave on 2012-01-10 at 18:31 |
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2012-01-10, 18:34
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#75 |
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Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88
3·29·83 Posts |
That chart is for general (meaning LL/TF) use, not P-1 Stage 2 use.
Last fiddled with by Dubslow on 2012-01-10 at 18:40 |
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2012-01-10, 18:39
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#76 | |
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Feb 2004
25·5 Posts |
Quote:
Code:
SETTING P-1/ECM STAGE 2 MEMORY ------------------------------ Stage 2 of P-1 factoring step prior to running a Lucas-Lehmer test is slightly more effective if it is given more memory to work with. However, if you let the program use too much memory then the performance of ALL programs will suffer. The good news is that 98% of the time the program uses a minimal amount of memory. In fact, the program will work just fine if you never let it use more than the minimum. So how do you intelligently choose the memory settings? Below are some steps you might take to figure this out: 1) Be conservative. It is better to set the memory too low than too high. Setting the value too high can cause thrashing which slows down all programs. Remember, the program will only use the extra memory in stage 2 of P-1 factoring (about 12 hours a month). 2) Start with how much memory is installed in your machine. Allow a reasonable amount of memory for the OS and whatever background tasks you run (say 100 or 200MB). This represents the maximum value you should use. The program won't let you enter more than 90% of installed memory. 3) Assuming you run your machine 24 hours a day, what hours of the day do you not use your computer? Make these your nighttime hours and let the program use a lot of memory during these hours. But reduce this value if you also run batch jobs at night. 4) Factor in the information below about minimum, reasonable, and desirable memory amounts for some sample exponents. If you choose a value below the minimum, that is OK. The program will simply skip stage 2 of P-1 factoring. Exponent Minimum Reasonable Desirable -------- ------- ---------- --------- 20000000 40MB 80MB 120MB 33000000 65MB 125MB 185MB 50000000 85MB 170MB 250MB |
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2012-01-10, 18:42
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#77 |
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Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88
160658 Posts |
My copy has a different title:
Code:
SETTING AVAILABLE MEMORY ------------------------ The P-1 factoring step prior to running a Lucas-Lehmer test is more effective if it is given more memory to work with. However, if you let the program use too much memory then the performance of ALL programs will suffer. The good news is that 98% of the time the program uses less than 8MB. In fact, the program will work just fine if you instruct the program to use only 8MB or less. So how do you intelligently choose the available memory settings? Below are some steps you might take to figure this out: 1) Be conservative. It is better to set the available memory too low than too high. Setting the value too high can cause thrashing which slows down all programs. Remember, the program will only use the extra memory in stage 2 of P-1 factoring (about 12 hours a month). 2) Start with how much memory is installed in your machine. Allow a reasonable amount of memory for the OS and whatever background tasks you run (say 100 or 200MB). This represents the maximum value you should use. The program won't let you enter more than 90% of installed memory. 3) Assuming you run your machine 24 hours a day, what hours of the day do you not use your computer? Make these your nighttime hours and let the program use a lot of memory during these hours. But reduce this value if you also run batch jobs at night. 4) Factor in the information below about minimum, reasonable, and desirable memory amounts for some sample exponents. Exponent Minimum Reasonable Desirable -------- ------- ---------- --------- 20000000 40MB 80MB 120MB 33000000 65MB 125MB 185MB 50000000 85MB 170MB 250MB For example, my machine is a dual-processor with 512MB of memory. I guess Linux can survive on 100MB of memory. Thus, I set the available memory to (512 - 100) or ~400MB. This is my nighttime setting. During the day, I set the available memory to 80MB. I can always stop mprime if it is doing P-1 factoring and I detect memory thrashing. More casual users will probably want to set the daytime memory to 8MB so they don't have to worry about mprime impacting system performance. If at all in doubt, leave the settings at 8MB. The worst that will happen is you end up running a Lucas-Lehmer primality test when stage 2 of P-1 factoring would have found a factor. Last fiddled with by Dubslow on 2012-01-10 at 18:44 |
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