Info PrimeGrid Challenges 2025

[Skillz]

OK, these have ETAs that could change, as I just updated lasso, but here is the times after changing
View attachment 130085

These tasks grow exponentially fast. 6 days from now those numbers wont mean anything.

 

[StefanR5R]

These tasks grow exponentially fast. 6 days from now those numbers wont mean anything.

Zen 1...2: 16,384 kB/CCX / 6,144 kB/job = 2⅔ concurrent jobs/CCX ≈ 2 concurrent jobs/CCX
Zen 3...5: 32,768 kB/CCX / 6,144 kB/job = 5⅓ concurrent jobs/CCX ≈ 4 concurrent jobs/CCX

1 day later: 7,680 kB/job; and 6 days to go until start of the challenge. The above job counts per CCX will likely be obsolete by then. I am a bit worried how useful Zen 2 will remain during the challenge.

 

[Skillz]

1 day later: 7,680 kB/job; and 6 days to go until start of the challenge. The above job counts per CCX will likely be obsolete by then. I am a bit worried how useful Zen 2 will remain during the challenge.

I think when using AVX512 for these tasks they use more L3. Based on the rate these things are going I don't know, but it's not looking good.

 

[Markfw]

BTW, these use AVX-512 a lot. The Zen 4 8854 is taking ~1.5 hours, and the 9950x is taking ~35 minutes. Thats a lot more than just 3.5-4.6 ghz.



I will try my Turin later and see what times it gets.

 

[Ken g6]

And we're off! "(uses up to 12288K cache per task in worst case)" currently.

 

[Markfw]

All tasks that I have running are way slower than the benchmarks I ran before this started. Something sure changed.

 

[StefanR5R]

The "edit primegrid preferences" page still says

FFT sizes: 2x72K to 2x384K (uses up to 12288K cache per task in worst case)

However, I am already seeing up to

Using Montgomery reduction AVX-512 FFT length 2x432K​

and

Using Montgomery reduction FMA3 FFT length 2x480K​

in boinc/slots/*/stderr.txt.

If 2x384K coefficients means 12.0 MiBytes size of the coefficients, then that's 2 arrays of 384*1024 coefficients with 16 Bytes?? (128 bits??) per coefficient. In contrast, the FFTs which the other LLR/PRST subprojects at PrimeGrid use, are single arrays of 64 bits wide coefficients… Not sure if this Montgomery reduction is really 128 bits math, or if it is 64 bits math but can't store each coefficient in place but is rather swapping back and forth between two 64 bits coefficients (times 2 arrays of those).

Anyway; if this also holds true for the FMA3 implementation, the that one is already 1t 15.0 MBytes cache footprint, uncomfortably close to what Zen 2 for example can carry in cache.

 

[Skillz]

@StefanR5R they think the FFT/L3 requirements for this sub project is different than the others.

The formula is 2*N*8 instead of 2*N*16.

Therefore a FFT size of 2x384K = 6MB

Which is perfectly fine for Rome.

 

[Ken g6]

Day 0.5 stats:

Rank___Credits____Username
1______4434844____markfw
3______3374805____Icecold
4______2764602____ChelseaOilman
5______2453328____crashtech
8______1315428____[TA]Skillz
22_____631283_____Orange Kid
31_____369641_____cellarnoise2
64_____140473_____w a h
70_____128749_____biodoc
76_____115711_____IEC
78_____111368___10esseeTony
93_____85358______Ken_g6
109____73322______waffleironhead

Rank__Credits____Team
1_____15998919___TeAm AnandTech
2_____5796618____Antarctic Crunchers
3_____5638217____Czech National Team
4_____3363494____SETI.Germany

 

[Markfw]

No day 1 summary ?

 

[Ken g6]

No day 1 summary ?

It's not ideal timing for me, so I'm doing day x.5. If you want to do stats on the day be my guest.

 

[Markfw]

It's not ideal timing for me, so I'm doing day x.5. If you want to do stats on the day be my guest.

Oh, well, I am not up anytime close either, so thats fine. Its just you usually do x.5, 1.x, etc....

edit: well, I have a small update for those not checking individual stats. I am now number one overall, and hope to stay there, thanks to my new 9755 128 core.

 

[Ken g6]

Oh, well, I am not up anytime close either, so thats fine. Its just you usually do x.5, 1.x, etc....

That was one time when the timing was just right.

 

[Ken g6]

Day 1.5 stats:

Rank___Credits____Username
1______15191620___markfw
2______11625091___Icecold
4______8899899____crashtech
5______8409996____ChelseaOilman
6______7765565____[TA]Skillz
10_____5354984____cellarnoise2
21_____2332548___10esseeTony
23_____1954852____Orange Kid
74_____585482_____w a h
77_____569869_____biodoc
86_____485736_____IEC
129____257151_____Ken_g6
150____194024_____waffleironhead
360____336________zzuupp

Rank__Credits____Team
1_____63627158___TeAm AnandTech
2_____20504614___Czech National Team
3_____17732465___Antarctic Crunchers
4_____13999878___SETI.Germany

And we're off! "(uses up to 12288K cache per task in worst case)" currently.

The preferences page now says, "uses up to 7680K cache, estimated".

 

[TennesseeTony]

Thanks Ken! I'm not sure why you don't want to do stats at 2am local time though.

 

[Markfw]

unoffical day 2 but 2 am. and its only top 10 teams and top 20 useds, as more won't really fit the way I do it. (pictures)

 

[Ken g6]

Day 2.5 stats:

Rank___Credits____Username
1______26649918___markfw
2______20763637___Icecold
4______15603177___crashtech
5______14732032___[TA]Skillz
7______14517448___ChelseaOilman
10_____9547958____cellarnoise2
14_____6439863___10esseeTony
29_____3286891____Orange Kid
46_____1835192____w a h
79_____1051980____biodoc
88_____862153_____IEC
139____451375_____Ken_g6
164____334437_____waffleironhead
376____8605_______zzuupp

Rank__Credits____Team
1_____116084672___TeAm AnandTech
2_____38563927___Czech National Team
3_____31506606___Antarctic Crunchers
4_____26684482___SETI.Germany

Still 7680K cache.

 

[cellarnoise]

Tony.... 21st to 14th. Watch out for that "user".

 

[TennesseeTony]

Witness ME!

 

[Skillz]

@Howdy you still around bro?

 

[TennesseeTony]

@StefanR5R surely has some bunkers....I've never passed him before.

 

[Ken g6]

Day 3.5 stats:

Stats for team TeAm AnandTech:
Rank___Credits____Username
1______50827277___Icecold
2______37388256___markfw
5______21981320___crashtech
7______20871069___ChelseaOilman
10_____17250505___w a h
11_____11616893___cellarnoise2
12_____10833967___10esseeTony
30_____4722946____Orange Kid
87_____1285491____biodoc
92_____1232479____IEC
144____654111_____Ken_g6
166____469408_____waffleironhead
410____8605_______zzuupp

Stats for team Ukraine:
Rank___Credits____Username
6______21698303___[TA]Skillz
13_____10803036___parsnip soup in a clay bowl
23_____6056668____KetamiNO [YouTube]
45_____2636526____Tamagoch
122____812506_____PDW
130____784556_____Skyman
218____259658_____Valentin44
219____259383_____ale4316
238____215077_____dimus
304____91816______alexhap
317____79772______Dromage
340____51149______rilian

Rank__Credits____Team
1_____195278246___TeAm AnandTech
2_____55901415___Czech National Team
3_____44839422___Antarctic Crunchers
4_____39827668___SETI.Germany
5_____27612542___Ukraine
6_____27459454___Aggie The Pew
7_____24010847___[H]ard|OCP
8_____23722159___AMD Users

I went looking for Stefan, and couldn't find him on our TeAm, but found some of us on a different team, so I included it.

 

[StefanR5R]

I went looking for Stefan,

parsnip borg'ed xii5ku's gear, as in most of the PG challenges of late.

 

[gsrcrxsi]

daaaaaaang Ice is throwing it down! and without cloud is amazing!

 

[StefanR5R]

The TeAm at the moment: 229 M
The next four teams (CNT + AC + SG + UA): 215 M

(And that's with some of the TeAm being guests at UA.)

Somehow the TeAm is exceptionally adept in Compositorial prime search. Or at least in the elimination of composite Compositorial candidates. :-)