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-   -   Double Checking on GPU72 (https://www.mersenneforum.org/showthread.php?t=18982)

bayanne 2013-12-06 18:29

Double Checking on GPU72
 
Is it still possible to be allocated exponents for cpu via GPU72 or is this now on the back burner?

kracker 2013-12-06 18:31

[QUOTE=bayanne;361280]Is it still possible to be allocated exponents for cpu via GPU72 or is this now on the back burner?[/QUOTE]

Yes, it is quite easy and most with GPU's do CPU assignments though gpu72. PM chalsall :smile:

chalsall 2013-12-06 18:35

[QUOTE=bayanne;361280]Is it still possible to be allocated exponents for cpu via GPU72 or is this now on the back burner?[/QUOTE]

Certainly. The assignments from GPU72 are for whatever platform the worker intends.

Please just PM me your Primenet "username". This is the username you use to log into Primenet, or configure in your prime.txt file. Importantly, DO NOT send me your Primenet password -- I don't need it, and don't want it.

This is required for "Spidy" to detect when you've completed the work.

kracker 2013-12-06 18:41

1 Attachment(s)
[QUOTE=chalsall;361283]Certainly. The assignments from GPU72 are for whatever platform the worker intends.

Please just PM me your Primenet "username". This is the username you use to log into Primenet, or configure in your prime.txt file. Importantly, DO NOT send me your Primenet password -- I don't need it, and don't want it.

This is required for "Spidy" to detect when you've completed the work.[/QUOTE]

Assuming Windows, you don't need to edit any txt files.

chalsall 2013-12-06 18:48

[QUOTE=kracker;361285]Assuming Windows, you don't need to edit any txt files.[/QUOTE]

Ah!!! Please be careful! Don't do this until I've been given the required username.

GPU72 needs to know the Primenet UserName before the proxy will assign work from its cache; otherwise the requests are simply passed to Primenet for fulfillment.

Mark Rose 2013-12-08 04:07

[QUOTE=chalsall;361288]Ah!!! Please be careful! Don't do this until I've been given the required username.

GPU72 needs to know the Primenet UserName before the proxy will assign work from its cache; otherwise the requests are simply passed to Primenet for fulfillment.[/QUOTE]

I sent you a PM regarding this. Did you get it okay? I didn't hear back from you.

kladner 2013-12-23 12:22

I recently changed most of my CPU work from P-1 to DC. I got an unpleasant surprise when the first DC to complete was a mismatch. Having nervously waited a couple more days, I am very happy to see that the two which completed overnight have matched. :w00t:

TheMawn 2013-12-23 19:16

Does anyone know the mismatch rate off the top of their head?

flashjh 2013-12-24 00:55

I don't, but I know there were a lot of bad LLs with the version of the Prime95 used back then... it's somewhere in for forums.

kladner 2013-12-24 01:02

[QUOTE=kladner;362705]..... I am very happy to see that the two which completed overnight have matched. :w00t:[/QUOTE]
.....and three more delivered matches during the day. :smile:

davieddy 2013-12-24 01:15

[QUOTE=kladner;362773].....and three more delivered matches during the day. :smile:[/QUOTE]I feel a prime coming on:smile:

kladner 2013-12-24 07:48

[QUOTE=davieddy;362776]I feel a prime coming on:smile:[/QUOTE]

That would be quite a shock. :shock:

davieddy 2013-12-24 07:56

[QUOTE=kladner;362788]That would be quite a shock. :shock:[/QUOTE]
Probability per day = (tests per day)*(probability of error)/250,000

retina 2013-12-25 04:01

[QUOTE=davieddy;362790]Probability per day = (tests per day)*(probability of error)/250,000[/QUOTE]Isn't there a factor missing: Namely the probability of a number being prime.

Probability per day = (tests per day)*(probability of error)/250,000 [color=red]* probability of being prime[/color]

[size=1][sup][sup][sup][sup][sup]Why is the colour tag missing the u?[/sup][/sup][/sup][/sup][/sup][/size]

davieddy 2013-12-25 04:23

[QUOTE=retina;362857]Isn't there a factor missing: Namely the probability of a number being prime.

Probability per day = (tests per day)*(probability of error)/250,000 [COLOR=red]* probability of being prime[/COLOR]

[SIZE=1][sup][sup][sup][sup][sup]Why is the colour tag missing the u?[/sup][/sup][/sup][/sup][/sup][/SIZE][/QUOTE]
No.
What requires clarification is the LHS.
It is the probability of a shock, namely finding a prime.

As it stands it refers to Kieren's DCs.
For my LL it would be (1/50)/450,000.

Merry Christmas!

axn 2013-12-25 05:45

[QUOTE=retina;362857]Isn't there a factor missing: Namely the probability of a number being prime.

Probability per day = (tests per day)*(probability of error)/250,000 [color=red]* probability of being prime[/color]
[/QUOTE]

What is the role of the magic number "1/250000"?

Also, it is not "Probability per day", it is "Expected primes per day" (as in, with really large values, the result can easily be > 1)

davieddy 2013-12-25 08:53

[QUOTE=axn;362861]Also, it is not "Probability per day", it is "Expected primes per day" (as in, with really large values, the result can easily be > 1)[/QUOTE]
THX. An important distinction.
The expected primes per day for the whole project is 1/1500.
So the probability of one or more primes per day is 1 - e[SUP]=1/1500[/SUP] = 1/1500.5

:smile:

davieddy 2013-12-25 18:16

[QUOTE=davieddy;362866]The expected primes per day for the whole project is 1/1500.
So the probability of one or more primes per day is 1 - e[SUP]=1/1500[/SUP] = 1/1500.5[/QUOTE]
@Phil: THX for allowing me to participate in the sort of mathsy fun which I enjoy.

Perhaps the 0.5 is worth looking into:

1 - e[SUP]-1/X[/SUP] ~ 1/X - 0.5*(1/X)[SUP]2[/SUP]
= (1/X)*(1 - 0.5*(1/X))
~ 1/(X*(1 + 0.5*(1/X))
= 1/(X + 0.5)

Wish I had done it that way first time.
Damn those calculators:smile:

D


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