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drummers-lowrise
1) Message boards : Aggie The Pew message board (Message 107728)
Posted 1272 days ago by Profile Greg
Last night there was a close encounter between Jupiter and a 12-day old Moon. This was the scene over the New Forest Observatories:

http://www.newforestobservatory.com/wordpress/wp-content/gallery/projects/Moon_Jupiter_Half.jpg



Greg
2) Message boards : Aggie The Pew message board (Message 107697)
Posted 1273 days ago by Profile Greg
SGS are only 4 days, but if it is indeed prime it should have lasted much longer to process & therefore the deadline will be 30 days. Is that right? If the wingperson isn't aware to not have a small or 0 cache for LLR he won't know SGS are much longer if prime.


Not exactly.

It is true that an SGS prime does take twice as long because LLR will go ahead and test the twin to see if it too is prime, but that second test is as short as the first one. Even dinosaur computers can do these in four days.

If a computer has hundreds of tasks, one of three things will happen:

1) The computer won't even get around to starting the task by the time the 4 days is up. The BOINC client will then automatically abort the tasks as soon as it reaches the four day deadline.

-or-

2) It gets to start the task before the deadline expires. Chances are it will finish the task and return within a few hours or minutes.

-or-

3) The user turns off the computer, or disconnects from PrimeGrid, or deletes BOINC, or just abandons the tasks in some other way. After 4 days (actually, 4 days plus 25 hours) the server declares the task overdue and sends out a replacement.

In the first two cases, you're waiting four days or less. In the third, you're waiting a tad more than 5 days.

The only way you'll wait more than that is if it's a VERY slow computer that doesn't have a lot of tasks. If it starts this task within the four days, and then runs continuously it will trickle and the deadline would be extended. But for short tasks like SGS, this is only likely with an exceptionally slow computer that is running only one task per core. A computer with lots of tasks will either complete it within 4 days, or abort the task after four days.


Apparently, "None of the above" wins.

The original wingman, whom we had all written off, returned the task 49 SECONDS before the 4-day deadline expired. It matched your result, validated, and now the server is checking the two n+1 and n-1 Sophie pairs.

Once that's done, the next step is a manual one where we actually report the prime to T5K. Then T5K's server does its own verification that the number is actually prime before the number shows up on the T5K list. Once that's complete the next time our server checks the T5K list (this happens twice each hour) the prime will become visible on PrimeGrid.


Many thanks for the explanation Michael - I did wonder what was going on :)
Greg
3) Message boards : Aggie The Pew message board (Message 107685)
Posted 1274 days ago by Profile Greg
A slightly belated conga-rats Greg.


Thank you Dave - although it still hasn't been checked by my wing man yet - so no "official" notification from PrimeGrid yet (Michael kindly checked for me, so that's really "official" I guess :) ).
4) Message boards : Aggie The Pew message board (Message 107673)
Posted 1274 days ago by Profile Greg
Now this is very cool.

CONGRATS to both of you !

On 3 May 2017, 19:30:03 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:

555*2^3393389+1

The prime is 1,021,515 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 203rd overall.

The discovery was made by Douglas B. McKay (KD7LRJ) of the United States using an Intel(R) Core(TM) i7-4790K CPU @ 4.00 GHz with 32GB RAM, running Microsoft Windows 10 Professional Edition. This computer took about 1 hour 15 minutes to complete the primality test using LLR. Douglas is a member of the Aggie The Pew team.

The prime was verified on 3 May 2017 20:11:14 UTC, by John Murphy (TheDawgz) of the United States using an Intel Virtual CPU with 1GB RAM, running Linux. This computer took about 1 hour 24 minutes to complete the primality test using LLR. John is a member of the Aggie The Pew team.

For more details, please see the official announcement.

Congrats to KD7LRJ and TheDawgz!!


Thanx!

I don't think we've ever seen a "big" prime with a formal announcement where both finder and double checker are from the same team.

This is TheDawgz 2nd PPS-MEGA as the double checker in the last 6 months - most annoying :op


I feel your pain :)
5) Message boards : Aggie The Pew message board (Message 107652)
Posted 1275 days ago by Profile Greg
congRATulations!

And keep those Sherlock episodes coming! ;)


Thank you and yes I will try and fit more Sherlock episodes into my busy schedule :)
Greg
6) Message boards : Aggie The Pew message board (Message 107651)
Posted 1275 days ago by Profile Greg
Well done Greg.


Thank you :)
Greg
7) Message boards : Aggie The Pew message board (Message 107586)
Posted 1277 days ago by Profile Greg
Just checked - real first and last name and reporting shows as yes - so now it's just the LONG wait :)
Thank you again Michael :)
8) Message boards : Aggie The Pew message board (Message 107585)
Posted 1277 days ago by Profile Greg
VERY many thanks for checking this out for me Michael - and thank you for the congratulations everyone. Yes the first one is a bit special and will stick in my (rapidly failing) memory for quite some time :)
Greg
9) Message boards : Aggie The Pew message board (Message 107567)
Posted 1277 days ago by Profile Greg
Thank you Rick - me too.
The suspense is not doing me any good at my age.
I might not make days :)
10) Message boards : Aggie The Pew message board (Message 107563)
Posted 1277 days ago by Profile Greg
There's always a downside to wreck my enjoyment. Looks like my wing man is days away from checking this number :(


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