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drummers-lowrise
1) Message boards : Number crunching : Strange timings on AMD 3700X (Message 156004)
Posted 5 days ago by GDB
A few of the cores may be faster because they are able to keep all of their data in L3 cache.
Everybody else has to access slow main memory. Life isn't fair. First come, first served.
2) Message boards : Number crunching : Strange timings on AMD 3700X (Message 156001)
Posted 5 days ago by GDB
It seems that when you have more than 4 workers, your L3 cache usage has exceeded your 32 MB of L3 cache.
So your 8 workers are causing the memory subsystem to thrash and all memory requests are going to slow memory, instead of fast L3 cache.
3) Message boards : Proth Prime Search : PPSE (Proth Prime Search Extended) too small for Top 5000 now (Message 155447)
Posted 40 days ago by GDB
Assuming PPSE gains 188 digits per week on average on the trailing edge of T5k, it will catch up on August 4th.

Please note this is a very rough guesstimate.
I will include an adjusted ETA in the next update next saturday.


Don't forget there are 3 challenges between now and Sept. Each of those will likely reduce PPSE tasks, and find primes that will increase the T5K base.
4) Message boards : Proth Prime Search : PPSE (Proth Prime Search Extended) too small for Top 5000 now (Message 155435)
Posted 41 days ago by GDB
With PPSE on LLR2, I decided to push there and started wondering when will PPSE rejoin Top5k.

With current performance (and thanks for LLR2), PPSE is advancing almost 1k in digits every 10 days.
That is esential, because 508400 digits is still shy of current 511k digits trailing edge of T5K.

While there are about 40 PPSE primes in last two weeks (and advancing toward T5K), it also slips away because of other/larger primes being reported.
~10 MEGA + 15 GFN16 primes that are larger than PPSE + a bit more from non-PG primes.
In order for PPSE to reach and STAY in T5K, there need to be more PPSE primes than others.
Also, PPSE needs to advance faster than trailing edge.

If we keep the pace, 2 weeks are 1k digits, which is about 50 places on T5K trailing edge.

GFN-19 challenge will probably postpone this effort but it may happend in early June I guess...


From the latest stats, it looks to be closer to Sept. than June before PPSE rejoins T5K list.
5) Message boards : Number crunching : Credit Milestones (Message 154823)
Posted 105 days ago by GDB
3 G for GDB
6) Message boards : Sierpinski/Riesel Base 5 Problem : Riesel k=3622 eliminated (outside PrimeGrid) (Message 154392)
Posted 124 days ago by GDB
How does this affect Base 5 searching?
Will this k be removed from PG?
Or will we continue searching this k, to find a smaller prime?
7) Message boards : Number crunching : Badges III (Message 154242)
Posted 129 days ago by GDB
10th of 16 possible jade badges.
8) Message boards : Number crunching : PrimeGrid Years (Message 153898)
Posted 140 days ago by GDB
Just a newbie, here only 10 years.
9) Message boards : Number crunching : Tour de Primes 2022 (Message 153726)
Posted 144 days ago by GDB
PG often run into task problems with both CPU and GPU enabled at the same time.
You either get too many CPU tasks, and starve your GPU, or too many GPU tasks, and starve your CPUs.

The solution is to NEVER run PG with CPU and GPU switches set at the same time.

The method I use is to decide which CPU and GPU tasks I want to run. Then determine if CPU or GPU tasks runs longer.
Then select CPU or GPU only for the longer running task, and using Job Control, select the number of long running tasks I want to download.
After downloading my longer running tasks, I switch CPU/GPU switches to the shorter task only,
and bump Job Control by the number of shorter tasks I want to download.
And then I leave it alone until I need to replenish my longer running tasks.
Then I flip my CPU/GPU switches, replenish my longer running tasks, and then switch the CPU/GPU switches back.

If your long running tasks run for a couple of days, or you have a large enough queue,
you can determine how often you need to replenish your long running jobs.

And you never have to worry about running out of short running tasks again!
10) Message boards : Number crunching : Badges III (Message 153527)
Posted 152 days ago by GDB
5th of 16 possible Double Silver badges.


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