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PPS Mega Prime!
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Scott Brown Volunteer moderator Project administrator Volunteer tester Project scientist
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Joined: 17 Oct 05 Posts: 2179 ID: 1178 Credit: 9,030,944,441 RAC: 13,566,963
                                      
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On 10 April 2016, 19:53:20 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
369*2^3365614+1
The prime is 1,013,154 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 155th overall.
The discovery was made by Will Steinbach (bill1024) of the United States using an Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz with 32GB RAM, running Linux. This computer took about 1 hour 36 minutes to complete the primality test using LLR. Will is a member of the Crunching@EVGA team.
The prime was verified on 10 April 2016, 20:58:16 UTC, by Stephen Norton (spnorton) of the United States using an Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz with 32GB RAM, running Microsoft Windows 7 Professional. This computer took about 2 hour 52 minutes to complete the primality test using LLR. Stephen is a member of the Alien Prime Cult team.
For more details, please see the official announcement.
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I red that announcement to my wife.
She looked at me and said " Your such a geek." LOL
One thing I noticed is I have a E5-2670 I believe at 2.9ghz with turbo.
The doublec-hecker has a i7-4790 At 3.6ghz maybe faster with turbo.
My time was 1:36 vs their 2:52 I use Linux they used win7.
Must be the same WU, I am surprised Linux is that much faster.
It is around 1.25 hour difference, that's a huge difference.
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RafaelVolunteer tester
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Joined: 22 Oct 14 Posts: 888 ID: 370496 Credit: 344,573,530 RAC: 530,935
                   
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I red that announcement to my wife.
She looked at me and said " Your such a geek." LOL
One thing I noticed is I have a E5-2670 I believe at 2.9ghz with turbo.
The doublec-hecker has a i7-4790 At 3.6ghz maybe faster with turbo.
My time was 1:36 vs their 2:52 I use Linux they used win7.
Must be the same WU, I am surprised Linux is that much faster.
It is around 1.25 hour difference, that's a huge difference.
If you don't have HT enabled while your wingman had, it would perfectly explain it. | |
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Yeah that must be why. I do not have HT enabled for primegrid LLR WUs.
I have seen my linux boxes finish WUs faster than my Win7 boxes, but not by that much.
Thanks
Bill | |
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I red that announcement to my wife.
She looked at me and said " Your such a geek." LOL
One thing I noticed is I have a E5-2670 I believe at 2.9ghz with turbo.
The doublec-hecker has a i7-4790 At 3.6ghz maybe faster with turbo.
My time was 1:36 vs their 2:52 I use Linux they used win7.
Must be the same WU, I am surprised Linux is that much faster.
It is around 1.25 hour difference, that's a huge difference.
Congrats Bill!
I was surprised as well! Not running Turbo, but I AM running Hyper-threading. My team partner has strongly urged me to stop the hyper-threading and just run one task per core, so I've reconfigured. It's my 4th Prime, but 3 have been as double-checker. Wondering if I should just switch to Linux! ;-)
Oh, and I pretty much don't tell anyone I do this... I already have two heads to them. ;-)
-steve | |
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I red that announcement to my wife.
She looked at me and said " Your such a geek." LOL
One thing I noticed is I have a E5-2670 I believe at 2.9ghz with turbo.
The doublec-hecker has a i7-4790 At 3.6ghz maybe faster with turbo.
My time was 1:36 vs their 2:52 I use Linux they used win7.
Must be the same WU, I am surprised Linux is that much faster.
It is around 1.25 hour difference, that's a huge difference.
Congrats Bill!
I was surprised as well! Not running Turbo, but I AM running Hyper-threading. My team partner has strongly urged me to stop the hyper-threading and just run one task per core, so I've reconfigured. It's my 4th Prime, but 3 have been as double-checker. Wondering if I should just switch to Linux! ;-)
Oh, and I pretty much don't tell anyone I do this... I already have two heads to them. ;-)
-steve
Thank you, congratulations to you as well. Finding primes is not easy.
Thousands of WUs and you may not find one. Persistence and luck are the key.
I would recommend turbo enabled and setting not having WUs sitting on the drive waiting to be done. I set mine to .01 with an additional .01 that way they get done, sent in and download another one to start right away.
The only difference between founder and double-checker is who turned the WU in first.
I do find Linux is faster at most BOINC projects, just not twice as fast!
Try it, you may like it. It takes some getting used to. There is plenty of help out there if you get stuck.
Have to say Windows is easier to work with. Linux has come a long way, still has a ways to go though.
Good luck!
Bill | |
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Michael Goetz Volunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13523 ID: 53948 Credit: 244,229,521 RAC: 385,247
                          
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There's a small difference between Linux and Windows, but usually it's simply that Windows runs a lot more crap in the background. With GPU apps, you'll often find Windows is actually faster because often the video drivers are better.
With CPU LLR or Genefer apps, NEVER use hyperthreading. The app will run at least twice as slow, which puts you at a huge disadvantage against the guy who isn't running with hyperthreading. (I bought an i5 specifically because of this. Why pay 50% more for the equivalent i7 when I'm never going to use hyperthreading? Take the $$$ and buy a better CPU cooler or video card or faster memory.)
But, by far, the biggest thing is the cache. Set it to 0 (or just barely above 0). You're competing against people who DO run with a 0 cache, and even if your computer is twice as fast as the other guy's, if the task sits on your computer for a day before it's started, the other guy is going to return the task first 9 times out of 10.
Bottom line: turn hyperthreading off and set the cache to zero, because you can bet the house that this is what your competition is doing. :)
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My lucky number is 75898524288+1 | |
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Crun-chi Volunteer tester
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Joined: 25 Nov 09 Posts: 3013 ID: 50683 Credit: 60,050,945 RAC: 81,620
                     
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Michael your advices are really good, but...
I noticed that from one Boinc version behavior is changed, not a lot, but it changes ( and I was writing about that on this pages)
On short WU ( before) when you set cache to 0 then Boinc will download new task right before old task is finished and sent. That was OK.
On new version, Boinc start to download new task when 70% of old task is over. Maybe difference is little, but that small one give chance to wig-man to be faster ( AVX2 vs AVX...)
Someone here told me that behavior of Boinc cannot be changed and I must accept that change... of course there is always option to put back old Boinc version...
Look at this message as observation, not question that needs answer :)
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92*10^1439761-1 NEAR-REPDIGIT PRIME :) :) :)
314187728^131072+1 GENERALIZED FERMAT
31*332^367560+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! | |
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mackerel Volunteer tester
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Joined: 2 Oct 08 Posts: 2468 ID: 29980 Credit: 449,006,784 RAC: 355,282
                           
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On Linux vs. Windows, in LLR testing there was no difference I could find between them in performance. Any I thought I did find could be explained by scheduler weirdness that went away once HT was off, and in that case Linux was worse.
Crun-chi, can you be more specific in versions of boinc with that behaviour? I'm running 7.6.22 on Windows, and that does the download just before WU finishes thing. This is the latest stable version. Is that behaviour in the latest dev version? | |
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Crun-chi Volunteer tester
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Joined: 25 Nov 09 Posts: 3013 ID: 50683 Credit: 60,050,945 RAC: 81,620
                     
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On Linux vs. Windows, in LLR testing there was no difference I could find between them in performance. Any I thought I did find could be explained by scheduler weirdness that went away once HT was off, and in that case Linux was worse.
Crun-chi, can you be more specific in versions of boinc with that behaviour? I'm running 7.6.22 on Windows, and that does the download just before WU finishes thing. This is the latest stable version. Is that behaviour in the latest dev version?
Please tell me what project you participate?
With long or with short results?
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92*10^1439761-1 NEAR-REPDIGIT PRIME :) :) :)
314187728^131072+1 GENERALIZED FERMAT
31*332^367560+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! | |
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mackerel Volunteer tester
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Joined: 2 Oct 08 Posts: 2468 ID: 29980 Credit: 449,006,784 RAC: 355,282
                           
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On the boinc thing? I lean towards shorter LLR units, up to TRP. Doesn't seem to make any difference what length the units are. New work is grabbed shortly before finishing. | |
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Congratulations to Will and Stephen!
Thanks Scott for the announcement :)
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Founder of CRUNCHERS SANS FRONTIERES
www.crunchersansfrontieres.org
CSF lucky number 22872882^65536+1 | |
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