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Old 2010-11-30, 12:05   #155
Thomas11
 
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738-746 complete, no primes.
Taking 778-786.
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Old 2010-11-30, 22:57   #156
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736-738 complete, one prime.

Already testing 776-778. I marked it on the top page but forgot to announce here.
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Old 2010-12-03, 10:21   #157
Beyond
 
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746-776 complete (3 primes)
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Old 2010-12-11, 16:32   #158
otutusaus
 
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Taking 786-798.
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Old 2010-12-13, 09:37   #159
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778-786 complete, 2 primes.
Taking 798-822.
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Old 2010-12-14, 14:24   #160
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Taking 822-824
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Old 2010-12-15, 18:58   #161
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The sievers should consider using a GPU to sieve, amphoria? I suppose sieve speed should be quite fast with only 128 k's.
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Old 2010-12-16, 09:29   #162
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Quote:
Originally Posted by em99010pepe View Post
The sievers should consider using a GPU to sieve, amphoria? I suppose sieve speed should be quite fast with only 128 k's.
I already tried GPU sieving for this drive on a relatively cheap ATI Radeon 5670. It reaches only about 85% of the speed compared to a single cpu core (Q6600) running sr2sieve, and the GPU sieve thereby utilizes a full cpu core too! Not to mention the memory requirement (about 2 GB vs. a few MB using sr2sieve)...
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Old 2010-12-16, 22:00   #163
mdettweiler
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Quote:
Originally Posted by Thomas11 View Post
I already tried GPU sieving for this drive on a relatively cheap ATI Radeon 5670. It reaches only about 85% of the speed compared to a single cpu core (Q6600) running sr2sieve, and the GPU sieve thereby utilizes a full cpu core too! Not to mention the memory requirement (about 2 GB vs. a few MB using sr2sieve)...
ppsieve's strong point is more in the way of large continuous blocks of k and n, rather than a handful of individual k's. I had a PM discussion with Ken (ppsieve's author) a while back about this and he explained that this is due to the rather different algorithm ppsieve uses as compared to sr2sieve. This algorithm allows for huge speed boosts on large continuous blocks, but totally stinks on just a few k's.

From what I gather, the sr2sieve algorithm does not lend itself nearly as well as ppsieve's to being ported to run on GPUs. At any rate, Ken said that he wasn't planning to undertake such a project in the forseeable future so for now, sr2sieve on CPUs is still the way to go for smaller sieves like this.
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Old 2010-12-17, 10:01   #164
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Quote:
Originally Posted by mdettweiler View Post
This algorithm allows for huge speed boosts on large continuous blocks, but totally stinks on just a few k's.
...
sr2sieve on CPUs is still the way to go for smaller sieves like this.
Thanks for that explanation. I will stay with sr2sieve for this drive...
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Old 2010-12-17, 10:02   #165
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Taking 824-840.
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