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PrimeGrid Challenges 2020

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
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Current challenge: PPSE-LLR, September 3-6 (Midnight UTC)

I see clearly now that it's time to post the list of PrimeGrid challenges for 2020: ;)

Code:
#  Date             Time UTC Project     Duration  Challenge
-----------------------------------------------------------------------------------------
1  24-25 January    00:00:00 321-Sieve    1 day     International Education Day Challenge
2  12-17 March      06:00:00 SR5-LLR      5 days    Year of the RAT
3    1-4 April      12:00:00 SGS-LLR      3 days    Sophie Germain's Birthday Challenge
4  23-26 June       22:00:00 PPS-Sieve    3 days    Alan Turing's Birthday Challenge
5  24-31 July       20:00:00 TRP-LLR      7 days    Katherine Johnson Memorial Challenge
6    3-6 September  00:00:00 PPSE-LLR     3 days    International Bacon Day Challenge
7  20-25 October    06:00:00 PPS-DIV      5 days    2020 World Expo Challenge
8  18-28 November   18:00:00 CUL/WOO-LLR 10 days    Magellan 500th Anniversary Challenge
10 21-31 December   13:22:00 GFN-18-20   10 days    Great Conjunction Challenge
What you need:
  • One or more fast x86 processors, preferably with lots of cores. (Even slow ones might do!)
  • Windows (Vista or later 64-bit, or XP or later 32-bit), Linux, or MacOS 10.4+.
  • BOINC, attached to PrimeGrid (http://www.primegrid.com/).
  • Your PrimeGrid Preferences with only the above project(s) selected in the Projects section.
  • Patience! All of these projects run long, slow WUs, at least on your CPU. As a result, no challenge is less than five days long. :eek:

What may help LLR (all but three of the challenges):
  • An Intel Sandy Bridge or later ("Core series" other than first-generation) processor with AVX may be 20-70% faster than with the default application. Sadly, that does not include Pentium or Celeron processors, or AMD processors.
  • In most challenges - probably all of these since their WUs are so large - it helps to enable multi-core processing in your PrimeGrid Preferences.
  • Faster RAM might help on some challenges, as long as it's stable.
What may help in other challenges:
  • A GPU helps in two challenges.
  • Juggling in some extra WUs may help in challenges where you run more than one WU on the CPU at a time. (Or, switching to use all cores on one WU at the end may work equally well.)

What won't help (but won't hurt either):
  • A large amount of RAM.
  • Any Android devices.

What won't help (and will hurt, sort of):
  • Unstable processors. (Invalid work will be deducted! :eek: If Prime95 worked recently on your processor, it should be stable.)
  • Work not downloaded anduploaded within the challenge. (It's not counted.) Should you not be able to be in front of one or more computers at that time, there are several options:
    • You can often set BOINC's network connection preferences to wait until a minute or two after challenge time.
    • And for short work units, you can just set the queue level very low (0.01 days). This also makes it more likely that you will be a prime finder rather than a double-checker. But you might want to raise their queue size after the challenge is underway.

Welcome and good luck to all! :)

P.S. If no one has posted stats lately, try tracking your stats with my user script. With that installed, visit the current challenge's Team stats link for TeAm stats.
 
Last edited:

zzuupp

Lifer
Jul 6, 2008
14,817
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bump... 4 321 SIEVE

I'm starting to switch over now, because tomorrow afternoon (my time, EST) is going to be a zoo.
Maybe I'll get lucky and that ye olde laptop will finish two before the start. So, it will have perfect timing for two in the race. :)
 
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Ken g6

Programming Moderator, Elite Member
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Dec 11, 1999
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Day ¼ stats:

Rank___Credits____Username
13_____572072_____crashtech
49_____213459_____biodoc
75_____121367_____emoga
99_____79285______Ken_g6
101____77455______Orange Kid
159____45131______SlangNRox
192____28054______Lane42
209____21345______zzuupp
233____14637______Howdy

Rank__Credits____Team
5_____2744482____SETI.Germany
6_____1986395____Sicituradastra.
7_____1423471____Antarctic Crunchers
8_____1172808____TeAm AnandTech
9_____1148413____Crunching@EVGA
10____1013628____BOINC@MIXI
11____795899_____AMD Users

Pretty good turnout for such a short race. :)
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
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Well, that was fast. Preliminary final stats:

Rank___Credits____Username
16_____2628604____crashtech
55_____940442_____biodoc
97_____436677_____Orange Kid
114____365321_____emoga
116____361051_____Ken_g6
158____232976_____SlangNRox
159____229316_____Lane42
192____173207_____[H]Skillz
193____171987_____zzuupp
238____122586_____Howdy
369____34153___10esseeTony

Rank__Credits____Team
6_____9408086____Sicituradastra.
7_____7267999____Crunching@EVGA
8_____6781311____Antarctic Crunchers
9_____5696325____TeAm AnandTech
10____5406630____BOINC@MIXI
11____4679037____Rechenkraft.net
12____4477775____UK BOINC Team

Well, we're still in the top 10.

I never seem to be able to beat @emoga unless I manage my systems perfectly.
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
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I guess I'd better bump this thread for the PG challenge in 3 hours. :eek:
 

VirtualLarry

Lifer
Aug 25, 2001
48,807
5,312
126
Thanks for the heads-up! I'm in, so far with my Ryzen R5 3600 (@stock).

It's a 6C/12T, is it better to have two tasks @ 5 threads ea., or three tasks @ 4 threads each?

Edit: I was actually in with Ryzen R5 3600 and 2x Ryzen R5 1600 CPUs.
 
Last edited:

emoga

Member
May 13, 2018
93
117
76
It's a 6C/12T, is it better to have two tasks @ 5 threads ea., or three tasks @ 4 threads each?
How about 2 tasks at 6 threads?

I only have data for 2 configs on my 3600.
-2X6 averages 6,656 seconds.
-1X12 averages 3,930 seconds.

You could try 3X4, but I doubt the loss in speed is worth the point gain (if there is any).
but if you do try 3X4, let me know the results ;)
 

StefanR5R

Diamond Member
Dec 10, 2016
3,569
3,844
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Concerning the runtime behavior of the LLR application, the R5 3600 theoretically works like a cluster of two computers*, each with 3C/6T and 16MB L3$. The connection between these two cluster nodes* has about the bandwidth and latency as the DRAM interface.

An LLR application instance performs a lot better if it is kept local to a single node out of these two cluster nodes*.

How many LLR application instances can run together on the same node* depends on the size of the hot data of the LLR tasks, which can be looked up. (I'll go look.)

--------
*) i.e., core complex (CCX)

Edit,
Hot data size of the current task varies. Therefore, run times on one and the same hardware with one and the same settings vary. I don't know how much they do. Personally, I consider comparisons based on run times of different random tasks less than useful.
 
Last edited:

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
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Day 0.5 stats:

Rank___Credits____Username
72_____56274______Ken_g6
95_____39296______VirtualLarry
147____16519______emoga
173____11331______zzuupp

Rank__Credits____Team
21____141899_____Alien Prime Cult
22____138054_____BOINC@Poland
23____125418_____The Scottish Boinc Team
24____123422_____TeAm AnandTech
25____93082______Canada
26____83410______Storm
27____78329______Dutch Power Cows

Not too bad for going against a World Community Grid sprint. And the sprint will be over before this Challenge is. :)
 
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Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
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Day 1.5 stats:

Rank___Credits____Username
74_____200477_____emoga
86_____163110_____Ken_g6
104____127030_____VirtualLarry
151____64974______Orange Kid
152____64614______zzuupp

Rank__Credits____Team
17____780407_____Ukraine
18____758817_____BOINCstats
19____678243_____UK BOINC Team
20____620208_____TeAm AnandTech
21____590812_____BOINC@Poland
22____512569_____Storm
23____494015_____Alien Prime Cult

Way to go, @emoga! Good to polish off the Polish. ;)
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
2,037
55
Day 2.5 stats:

Rank___Credits____Username
71_____389869_____emoga
93_____271405_____Ken_g6
109____216289_____VirtualLarry
122____184463_____Orange Kid
154____122143_____zzuupp
256____35594______SlangNRox
395____2475_______mnelsonx

Rank__Credits____Team
16____1610636____The Knights Who Say Ni!
17____1380928____Ukraine
18____1366308____BOINCstats
19____1222241____TeAm AnandTech
20____1138951____UK BOINC Team
21____1138009____Storm
22____1060976____BOINC@Poland

Half done! Slow and steady...um...keeps us from falling in the rankings?
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
2,037
55
Day 3.5 stats:

Rank___Credits____Username
70_____579364_____emoga
99_____379996_____Ken_g6
108____315076_____VirtualLarry
113____302270_____Orange Kid
161____173353_____zzuupp
193____122938_____SlangNRox
241____69803______Icecold-Team Anandtech
253____57301______biodoc
449____2475_______mnelsonx
495____2017_______crashtech

Rank__Credits____Team
16____2296191____The Knights Who Say Ni!
17____2061516____BOINCstats
18____2013867____Ukraine
19____2004598____TeAm AnandTech
20____1767591____Storm
21____1760458____BOINC@Poland
22____1639164____UK BOINC Team

We're picking up users. I hope we pick up speed soon too.
 

StefanR5R

Diamond Member
Dec 10, 2016
3,569
3,844
106
Is it just me, or did the PrimeGrid folks implement that their scheduler assigns only one new task per each request for new work of the "mt" plan class? (As a workaround for boinc's run time bookkeeping mistakes when several tasks are fetched in the same request, certainly?)
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
2,037
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Day 4.6 stats:

Rank___Credits____Username
61_____910680_____xii5ku
67_____829590___10esseeTony
71_____786111_____emoga
88_____634664_____crashtech
105____495448_____Ken_g6
108____484651_____biodoc
114____431551_____Orange Kid
119____413761_____VirtualLarry
173____229516_____zzuupp
177____224504_____SlangNRox
213____138689_____Icecold-Team Anandtech
501____2475_______mnelsonx

Rank__Credits____Team
7_____11530542___Ultimate Chaos
8_____11101729___[H]ard|OCP
9_____5785671____Rechenkraft.net
10____5581645____TeAm AnandTech
11____5560675____BOINC@MIXI
12____5510956____AMD Users
13____5156573____Crunching@EVGA

Top ten, here we...are! :D Just a few hours to go...
 

TennesseeTony

Elite Member
Aug 2, 2003
3,855
2,730
136
www.google.com
14 threads per task seems inefficient, but time is of the essence. ;)

EDIT: I am going to have to pull one computer early, lots of invalid work and a few inconclusive tasks. (AMD 3800 X1)
 
Last edited:

VirtualLarry

Lifer
Aug 25, 2001
48,807
5,312
126
Is this still on, or is it over? Drooling for stats, did we make better than 9th?

Edit: Checking primegrid.com, we came in at a solid 9th place for the TeAm. Yay us!

Edit: Congrats to [H]ardOCP, which got an even more solid 8th place.

I only regret that I had three 6C/12T CPUs to give to the effort. Maybe someday (after the whole CoronaVirus thing, gotta stock up), I might upgrade some of my rigs to 12C or even 16C AM4 CPUs, if prices drop enough. ($500 for 16C/32T 3950X, could it happen?)
 
Last edited:

Markfw

CPU Moderator, VC&G Moderator, Elite Member
Super Moderator
May 16, 2002
20,570
8,416
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Is this still on, or is it over? Drooling for stats, did we make better than 9th?

Edit: Checking primegrid.com, we came in at a solid 9th place for the TeAm. Yay us!

Edit: Congrats to [H]ardOCP, which got an even more solid 8th place.

I only regret that I had three 6C/12T CPUs to give to the effort. Maybe someday (after the whole CoronaVirus thing, gotta stock up), I might upgrade some of my rigs to 12C or even 16C AM4 CPUs, if prices drop enough. ($500 for 16C/32T 3950X, could it happen?)
I don't think you will get a 3950x for $500, but you can get a threadripper 1950x + motherboard for $475 + shipping,
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
15,060
2,037
55
Is this still on, or is it over? Drooling for stats, did we make better than 9th?
Oops, I forgot to post final stats:

Rank___Credits____Username
48_____1243328____xii5ku
58_____1071420___10esseeTony
72_____860038_____crashtech
74_____823131_____emoga
94_____645569_____biodoc
107____537047_____Ken_g6
116____467893_____Orange Kid
121____435083_____VirtualLarry
172____254169_____SlangNRox
175____248699_____zzuupp
195____187355_____Icecold-Team Anandtech
510____2475_______mnelsonx

Rank__Credits____Team
6_____20783668___SETI.Germany
7_____12744901___Ultimate Chaos
8_____11986871___[H]ard|OCP
9_____6776213____TeAm AnandTech
10____6340494____Rechenkraft.net
11____6029932____BOINC@MIXI
12____6026839____AMD Users

At least we got to tell some Germans "Nein!" ;)
 

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