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Search: Posts Made By: preda
Forum: Information & Answers 2022-09-28, 19:11
Replies: 32
Views: 1,124
Posted By preda
Not my fix, George found the issue and fixed it....

Not my fix, George found the issue and fixed it. I was only affected by it, and I did a thorough hardware debug (replace CPU, replace all memory, replace subsets of DIMMs etc) to reach the conclusion...
Forum: Information & Answers 2022-09-28, 10:03
Replies: 32
Views: 1,124
Posted By preda
Should be fixed in the new build posted. Was...

Should be fixed in the new build posted. Was affecting systems with large (>64GB) RAM.
Forum: Hardware 2022-09-26, 19:48
Replies: 17
Views: 85,266
Posted By preda
OK thanks. In case you want to try, there is...

OK thanks. In case you want to try, there is Prime95 for Windows https://www.mersenne.org/download/ which I assume has the same benchmark function as on Linux. I don't know how easy all that is over...
Forum: Hardware 2022-09-26, 19:05
Replies: 17
Views: 85,266
Posted By preda
Thanks for the very informative write-up! ...

Thanks for the very informative write-up!

Given that you have the hardware, and out of the embargo, could you post a mprime (Prime95) benchmark? (mprime also using AVX-512)
Forum: Software 2022-09-26, 15:19
Replies: 735
Views: 68,134
Posted By preda
Intel(R) Core(TM) i9-10940X CPU @ 3.30GHz CPU...

Intel(R) Core(TM) i9-10940X CPU @ 3.30GHz
CPU speed: 3805.32 MHz, 14 hyperthreaded cores
CPU features: Prefetchw, SSE, SSE2, SSE4, AVX, AVX2, FMA, AVX512F
L1 cache size: 14x32 KB, L2 cache size:...
Forum: Software 2022-09-26, 06:12
Replies: 735
Views: 68,134
Posted By preda
I ran a benchmark with all 14cores, and indeed it...

I ran a benchmark with all 14cores, and indeed it seems to pick up the FFT bench timings afterwards. Although the run configuration is 1worker/12cores.

The benchmark asks for the number of cores...
Forum: Software 2022-09-25, 04:11
Replies: 735
Views: 68,134
Posted By preda
mprime did run a auto-bench during the night, and...

mprime did run a auto-bench during the night, and appended this to results.bench.txt:


But later on, it started a P-1 first stage with this config:
Using AVX-512 FFT length 6272K, Pass1=896,...
Forum: GPU Computing 2022-09-24, 20:26
Replies: 3
Views: 183
Posted By preda
Yes, the riser I was using looks *exactly* like...

Yes, the riser I was using looks *exactly* like the one you linked.



Yes that cable exactly. I'm surprised that leaving only that [data]cable not-connected would brick the GPU.

I'm running...
Forum: GPU Computing 2022-09-24, 18:15
Replies: 3
Views: 183
Posted By preda
Radeon VII GPU dead? (why?)

One of my Radeon VII GPUs died today. It happened during a power cycle.

I think this is what happened: I was running the GPU with a USB riser. This "mining style" riser has a power input from the...
Forum: Software 2022-09-24, 15:44
Replies: 735
Views: 68,134
Posted By preda
Force Bench for P-1

I have changed my CPU (to i9-10940x), and afterwards I ran a small benchmark for 6272K FFT with such results:

Prime95 64-bit version 30.8, RdtscTiming=1
FFTlen=6272K, Type=3, Arch=8, Pass1=896,...
Forum: Software 2022-09-12, 18:57
Replies: 735
Views: 68,134
Posted By preda
Thank you for the answers! Now I'm thinking...

Thank you for the answers!

Now I'm thinking of running only the P-1 second-stage on the high-RAM CPU, and running the corresponding first-stage on a low-RAM GPU (e.g. using gpuowl). This way the...
Forum: Software 2022-09-11, 09:18
Replies: 735
Views: 68,134
Posted By preda
Second-stage memory use with dual worker

Hello, I have a CPU system with 128GB RAM, and I'd like to have P-1 second-stage use most of that RAM (let's say, 110GB). I see that the work of one worker is split roughly half/half between the...
Forum: GpuOwl 2022-05-12, 11:11
Replies: 2,788
Views: 409,990
Posted By preda
Ken, I don't understand what you propose there --...

Ken, I don't understand what you propose there -- to do the validation in parallel with the last bit of a preceding exponent, upon resume?
Forum: GpuOwl 2022-05-12, 11:01
Replies: 34
Views: 3,838
Posted By preda
If using gpuowl 7.x, also try with -use...

If using gpuowl 7.x, also try with
-use TRIG_COMPUTE=0
or 1, or 2 (2 being the default).
The idea being that 2 does more compute, 0 does more memory accesses, and 1 is intermediary between those...
Forum: Information & Answers 2022-05-10, 15:49
Replies: 8
Views: 1,040
Posted By preda
Never delete anything. Create a "temporary"...

Never delete anything. Create a "temporary" directory somewhere, and just *move* what you want to delete there.

Later on, you can always move it back if the mood changes.

When everything is...
Forum: GPU Computing 2022-04-10, 17:22
Replies: 376
Views: 103,160
Posted By preda
It was in December 2020. I imagine it must...

It was in December 2020.

I imagine it must have been painful to lose so many R7s, sorry for that. Indeed a pity they're not made anymore, in retrospective I should've bought a few more just for my...
Forum: GPU Computing 2022-04-10, 08:21
Replies: 376
Views: 103,160
Posted By preda
I had one R7 GPU die on me following something...

I had one R7 GPU die on me following something PSU related, not sure exactly what happened there. But the symptoms were similar, the lights/fans were ON but the GPU was not detected. I looked in the...
Forum: GpuOwl 2022-03-27, 06:16
Replies: 2,788
Views: 409,990
Posted By preda
But maybe something should be done to fix the...

But maybe something should be done to fix the root of the problem, which is IMO that the proof file was not saved, but the checkpoint was advanced.

Edit: I see now what the code does. If it can't...
Forum: GpuOwl 2022-03-27, 05:59
Replies: 2,788
Views: 409,990
Posted By preda
Laur, the version I'm using (v7.2-86) does keep...

Laur, the version I'm using (v7.2-86) does keep many checkpoints to restart from, and whatsmore the number is configurable (so it's possible to keep much more if desired), and they also have the...
Forum: GpuOwl 2021-11-19, 14:49
Replies: 5
Views: 982
Posted By preda
I don't understand what happened. The proof...

I don't understand what happened. The proof residues are written once only, afterwards they are only read. The check of residues at startup is done CPU-side only (it's a very simple checksum over the...
Forum: Software 2021-11-04, 09:26
Replies: 10
Views: 1,980
Posted By preda
P-1 only "eliminates" an exponent if a factor is...

P-1 only "eliminates" an exponent if a factor is found.

I suggest using bounds of at least B1=1M,B2=20M. (I use B1=3M and B2=60M myself).
Forum: Software 2021-09-24, 08:31
Replies: 7
Views: 1,524
Posted By preda
In my understanding, VIRT in "top" for a process...

In my understanding, VIRT in "top" for a process indicates "virtual" memory that is not mapped to physical memory. That would happen for example after a malloc() but before writing anything to the...
Forum: Lounge 2021-09-06, 19:12
Replies: 1,990
RIP
Views: 246,467
Posted By preda
Ivan Patzaichin

Ivan Patzaichin was a legendary Romanian canoeist: https://en.wikipedia.org/wiki/Ivan_Patzaichin
Forum: Math 2021-07-06, 17:27
Replies: 24
Views: 4,540
Posted By preda
Maybe related, please see the thread about what I...

Maybe related, please see the thread about what I coined "PRP-1": https://www.mersenneforum.org/showthread.php?t=23628
Forum: mersenne.ca 2021-06-14, 19:20
Replies: 16
Views: 2,800
Posted By preda
Yes AFAIK the new formula is correct. ...

Yes AFAIK the new formula is correct.

fancySum(a, b) = a + b * (1 - a) == a + b - a * b
Showing results 1 to 25 of 1000

 
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