Info PrimeGrid Challenges 2024, sieve-free edition

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gsrcrxsi

Member
Aug 27, 2022
55
31
61
which are what CPUs ?
A lot of the newer and even older Intel Xeons with large single cache.

Intel CPUs have had 45+MB L3 for a long time, even back to the E5-v3 models. Didn’t get AVX512 until the Xeon Scalable models, but many of those have 100+ MB too. The key is that it’s a single cache and not chiplets like AMD. Only the X3D models from have more than 32MB in a single cache block for AMD.
 
Last edited:
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Icecold

Golden Member
Nov 15, 2004
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But even the appropriate Intel CPUs with lots of cache will be slower than GPUs.
Yeah when I tested it on a dual cascade lake system, which should be pretty close to a best case scenario (enough cache for the tasks to run 2 per CPU, AVX512, etc.) It was still only ~562k points per day which even an older GPU should be able to beat.
 
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Markfw

Moderator Emeritus, Elite Member
May 16, 2002
26,681
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Yeah when I tested it on a dual cascade lake system, which should be pretty close to a best case scenario (enough cache for the tasks to run 2 per CPU, AVX512, etc.) It was still only ~562k points per day which even an older GPU should be able to beat.
Thanks. I will stick with my 3 4080 and 5 4090 cards. Anything else I have like 4090ti's are for emergency ,as they are very inefficient.
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
26,681
15,737
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OK, it starts tomorrow at ~10:15 am PST, 1:15 pm EST ?????
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
26,681
15,737
136
we are currently 1st as a team, but not by a lot. Will know more after one day. I am no longer first, I keep moving between 2,3,4 place.
 
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Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
16,472
4,323
75
Day 1 stats:

Rank___Credits____Username
3______24909653___crashtech
7______18017078___markfw
8______13652861___Pokey
9______12826910___[TA]Skillz
30_____5307374____ChelseaOilman
32_____5116553____w a h
42_____3604624____cellarnoise2
43_____3585627____biodoc
46_____3362267____mmonnin
130____1025256____Ken_g6
135____863808_____Fardringle
158____681493_____waffleironhead
160____681148_____SlangNRox
232____181161_____johnnevermind

Rank__Credits____Team
1_____93821134___TeAm AnandTech
2_____75042363___Antarctic Crunchers
3_____67541098___Planet 3DNow!
4_____43202662___SETI.Germany

That's kind of close. We can use all the cards we can get. I'm about to start another one up.
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
26,681
15,737
136
Let's also not forget this Challenge is in honor of Willy. The person behind the scenes of boincstats.com. Cancer can, well I can't say it here.
since I lost to it, exactly why (except for this race) I run medical stuff that researches cancer. At the moment I am doing Rosetta.
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
16,472
4,323
75
Day 2 stats:

Rank___Credits____Username
4______48057039___crashtech
7______37385881___markfw
8______33170699___[TA]Skillz
10_____28041868___Pokey
28_____11490682___ChelseaOilman
33_____9551922____w a h
39_____8314220____cellarnoise2
40_____7796950____mmonnin
41_____7734322____biodoc
135____2219500____Ken_g6
152____1709269____waffleironhead
173____1363659____SlangNRox
198____1034280____Fardringle
210____874268_____johnnevermind

Rank__Credits____Team
1_____198749880___TeAm AnandTech
2_____165887165___Antarctic Crunchers
3_____117262229___Planet 3DNow!
4_____95460576___SETI.Germany
 

Ken g6

Programming Moderator, Elite Member
Moderator
Dec 11, 1999
16,472
4,323
75
Day 3 stats:

Rank___Credits____Username
5______73108484___crashtech
7______58076690___[TA]Skillz
8______57088816___markfw
10_____43415885___Pokey
28_____18879449___ChelseaOilman
35_____13823568___w a h
39_____12547231___mmonnin
40_____12191514___biodoc
41_____12048957___cellarnoise2
137____3602020____Ken_g6
152____2908730____waffleironhead
189____1881477____SlangNRox
200____1716344____Fardringle
217____1386468____johnnevermind

Rank__Credits____Team
1_____312680954___TeAm AnandTech
2_____241236524___Antarctic Crunchers
3_____182707272___Planet 3DNow!
4_____156928163___SETI.Germany

Our lead's looking better.
 

Icecold

Golden Member
Nov 15, 2004
1,123
1,063
146
22 core Broadwell Xeon with 55MB cache is 26 to 42 hours. Ouch.
Yeah CPU tasks take a really long time even on decently fast and/or avx 512 cpu's.

Dual socket Cascade Lake 24 core - 1 task per CPU (2 total) x 24 threads - 14.7 hours
Sapphire Rapids 48 core - 2 tasks x 24 threads - 15.5 hours

The Sapphire Rapids is a lower clock speed than the Cascade Lake but also currently only has one stick of RAM so I'm not sure if that's making a difference in performance.
 
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