mersenneforum.org - View Single Post - Prime95 30.8 (big P-1 changes, see post #551)

nordi · 2021-11-28, 23:43

I also benchmarked four Zen2 cores (=1 core complex) working on 11977759 (FFT length in stage 2 768K) with B2=50,000,000 (which mprime modified a bit) and different RAM settings. The timings are for stage 2 init and stage 2 itself, plus the total time.

Code:

8.5 GB  10.8 + 315.6 = 326.4 seconds   B2=51,228,870
17 GB   24.6 + 165.7 = 190.3 seconds   B2=51,278,370
34 GB   43.4 + 138.3 = 181.7 seconds   B2=72,162,090

Doubling RAM from 8.5 to 17 GB gave 72% more throughput.
Doubling RAM again to 34 GB gave 5% more throughput at a much higher B2.
Even with 96GB available, mprime still used 'only' 34GB, so no more benchmark results. But still, this version wants LOTS of RAM and puts it to excellent use.

2021-11-28, 23:43	#45
nordi Dec 2016 2³·3·5 Posts	I also benchmarked four Zen2 cores (=1 core complex) working on 11977759 (FFT length in stage 2 768K) with B2=50,000,000 (which mprime modified a bit) and different RAM settings. The timings are for stage 2 init and stage 2 itself, plus the total time. Code: 8.5 GB 10.8 + 315.6 = 326.4 seconds B2=51,228,870 17 GB 24.6 + 165.7 = 190.3 seconds B2=51,278,370 34 GB 43.4 + 138.3 = 181.7 seconds B2=72,162,090 Doubling RAM from 8.5 to 17 GB gave 72% more throughput. Doubling RAM again to 34 GB gave 5% more throughput at a much higher B2. Even with 96GB available, mprime still used 'only' 34GB, so no more benchmark results. But still, this version wants LOTS of RAM and puts it to excellent use. Last fiddled with by nordi on 2021-11-28 at 23:45