Thread: mtsieve
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Old 2021-01-11, 19:54   #495
rebirther's Avatar
Sep 2011

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Originally Posted by rebirther View Post
Tried now the cl version on a RTX 5500XT with 8GB RAM but hit the limit, there was a driver timeout because of too much RAM used, I think it was 7.4GB.

srsieve2cl.exe -n2501 -N10000 -P1e9 -M 15000 -spl_remain.txt -fB

2021-01-11 19:57:22: Sieve completed at p=1000071173. Primes tested 50772480. Found 87459308 factors. 16098192 terms remaining. Time 239.43 seconds

The speed is awesome, still running this on 16 cores srsieve2 to compare. Could be much better on faster cards with 16-24GB RAM.
vs Ryzen 3950X with 16 cores

srsieve2 -n2501 -N10000 -P1e9 -W16 -spl_remain.txt -fB

2021-01-11 20:50:35: Sieve completed at p=1000000007. Primes tested 50847420. Found 92827983 factors. 10729517 terms remaining. Time 4990.80 seconds

The CPU reduces the sievefile a bit more than GPU.
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