MQueens deadline too short, no save point?

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mister.marmot
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MQueens deadline too short, no save point?

#1 Ungelesener Beitrag von mister.marmot » 29.06.2019 15:37

Summer time and my machines are downclocked or using only low power CPU's.

The MQueens WU shows estimated 3 days runtime and the deadline is 2 days.

Also, shutting down the machines in hottest part of day when electric prices jump from 8 cents to 32 cents/ kwh.
The WU doesn't seem to make a save point so WU's with deadline of June 27 have been running for 4 days and still show 1-2 days till completion.

Are they making save points?
Are they using the save point to restart from?
Is there grace period of up to 10 days like YAFU?

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Re: MQueens deadline too short, no save point?

#2 Ungelesener Beitrag von yoyo » 30.06.2019 07:02

The applicatin is still in test mode.
Later the deadlin will be much longer and the runtime shorter.
We don't have save points, but the progress percentage is real. The application reports it to boinc.
And you get credits even after the deadline.
HILF mit im Rechenkraft-WiKi, dies gibts zu tun.
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Re: MQueens deadline too short, no save point?

#3 Ungelesener Beitrag von mister.marmot » 30.06.2019 23:52

And you get credits even after the deadline
Thanks for the response, although the WU was 3 days late (had to shut down machine for thunderstorms and deadline is very tight) and got 0 credit.

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Re: MQueens deadline too short, no save point?

#4 Ungelesener Beitrag von marsinph » 08.07.2019 17:44

Hello Marmot,
And not forget, the additional, now a wingman is required ! So additional problems
I could crunch one MQueens ( https://www.rechenkraft.net/yoyo/workun ... d=47873293

Then I not see the scientific goal of this app !
I am chess player. Without reading the source code, each chess player will say only one queen by line and by column.
Then it need the calculation about diagonal.

let start with colum. (Can be done by line of course)
i = iteration
c= colum
l=line


First filling board
For ic=1 to M
for il= c+1 to M
if fasle set true (presence of queen) else set false (means already a queen . usefull later for diagonal test)
next
next


Diagonal test
For ic=1 to M
for il: ic+1 to M
if lc=true (presence of queen) : il=m-1; ic=M-1 ( it will exit at next iteration : not valid solution)
else : (possible valid solution)
next
next

Final test
for c=1 to M
for l=1 to M
if lc=true : l=l-1; c=c-1 (not valid solution presence of queen)
else M is a valid solution
next
next


Now Marmot, if you search credits for competition, forget MQueens !
It give the less creditqs from all appilcations here !!!

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Re: MQueens deadline too short, no save point?

#5 Ungelesener Beitrag von gemini8 » 08.07.2019 18:12

marsinph hat geschrieben:
08.07.2019 17:44
Then I not see the scientific goal of this app !
I am chess player. Without reading the source code, each chess player will say only one queen by line and by column.
Then it need the calculation about diagonal.
I'm not a Chess player.
I know the basic rules, but if I play, I suck hard!
Nonetheless I can assure you: This is not about Chess.
This is about mathematics, and only the rules on which the 'Queens' may be distributed are taken from Chess.
As I don't see any reality-relation, this might be called sort of a philosophic-induced mathematics problem. ;-)
Gruß, Jens
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Re: MQueens deadline too short, no save point?

#6 Ungelesener Beitrag von marsinph » 09.07.2019 19:33

Hello Gemini,

If u konw the basic rules, it is very easy to unerstand :
Of ourse it is mathematic.
Chess is mathematical problem.

Here to not speak about chess, I will change the name :
Start : a square of M lines / colons
On each line can be only one piece (true/false)
On each column can be only one piece (true or false)
Additional condition : it can not have a piece on a column (or line) if already a piece on same line (or column) yes opposite of previous condition.

Then test on diaganal

Bute what bring this calculation ???

It is the basic version of the game SUDOKU.

By the way it is no any scientific research.

This Boinc project send WU some, with wingman, or without. Credits are totaly inadequate regarding running time.
Some takes 8Gb RAM for one WU, some other are "normal"........

Best regards

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Re: MQueens deadline too short, no save point?

#7 Ungelesener Beitrag von gemini8 » 09.07.2019 20:32

Hi.
In another thread yoyo mentioned that this is sort of basic research, way below any grand mathematical problem.
He explained that in earlier times primes have been 'curious' numbers without any sense, but that nowadays they are a fundamental part of security applications.
This small queens problem might or might not become part of anything which could be used in the future.
But, if you don't want to donate computing cycles to it, you may just drop it by disabling it in the preferences or, dropping yoyo at all.

Regarding credits I have to say that different projects reward different calculations in a different way which is not comparable between projects and sometimes not even between sub-projects.
I for myself tend to crunch anything that BAM! is throwing at me and only adjust the resource share to give different projects different computing power.
Gruß, Jens
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