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Message boards : Proth Prime Search : How much slower is the 32 bit sieve?

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Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (10,624,714)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,935,716)SGS LLR Ruby: Earned 2,000,000 credits (2,014,138)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (7,161,803)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,114,260)GFN Emerald: Earned 50,000,000 credits (68,965,890)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 20783 - Posted: 2 Feb 2010 | 18:38:54 UTC

I have the option of running either the 32 or 64 bit PPS sieve, but if I run the 64 bit version, I need to either keep a CPU core idle or stop crunching on the GPU.

Since I'm not going to shut off the GPU, that means if I run the 64 bit version of the sieve I'll lose about 25% of my CPU crunching power due to the idle core.

Anyone know by how much the 32 bit version is slower than the 64 bit version? Is it worth it to keep a core idle, or should I just crunch in 32 bit mode?

Does this apply to the other sieves as well?

If it makes a difference, the operating systems are 32-bit Vista and 64-bit Unbuntu.

Thanks!

LexsProject donor
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321 LLR Amethyst: Earned 1,000,000 credits (1,281,253)Cullen LLR Ruby: Earned 2,000,000 credits (2,050,895)PPS LLR Jade: Earned 10,000,000 credits (10,537,729)PSP LLR Ruby: Earned 2,000,000 credits (2,162,049)SoB LLR Amethyst: Earned 1,000,000 credits (1,170,185)SGS LLR Ruby: Earned 2,000,000 credits (2,003,465)TPS LLR (retired) Silver: Earned 100,000 credits (253,775)TRP LLR Ruby: Earned 2,000,000 credits (2,057,863)Woodall LLR Amethyst: Earned 1,000,000 credits (1,156,322)321 Sieve Amethyst: Earned 1,000,000 credits (1,580,131)Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,010,671)PPS Sieve Jade: Earned 10,000,000 credits (17,904,428)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,000,607)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,193,192)AP 26/27 Ruby: Earned 2,000,000 credits (2,500,663)PSA Amethyst: Earned 1,000,000 credits (1,166,390)
Message 20786 - Posted: 2 Feb 2010 | 19:07:05 UTC - in response to Message 20783.

I see ~8700s (WinXP32) vs. ~6600s (Ubuntu64) on a Core 2 Duo E8500 3.16GHz.
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Message boards : Proth Prime Search : How much slower is the 32 bit sieve?

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