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Old 2013-07-13, 18:15   #45
Citrix
 
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Quote:
Originally Posted by opyrt View Post
I didn't test that, as we are at n=15M+ now.

I believe it is how much CPU that is used to feed the GPU.
I meant testing 15-16 M or 15M to 15.1 M
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Old 2013-07-13, 18:28   #46
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Quote:
Originally Posted by Citrix View Post
I meant testing 15-16 M or 15M to 15.1 M
That was my first test Take a look at the file attatched. 437 candidates from 15M

Speeds:
ppsieve: GTX570 - 225M p/sec with 2 clients running (75% load)
sr2sieve: slow laptop cpu - 26M p/sec 1 client running
Attached Files
File Type: zip test.zip (771 Bytes, 217 views)
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Old 2013-07-13, 18:37   #47
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I think this will be useful to avoid some PRP tests.
I think ppsieve can be made faster since the PSP k's are low weight and we can add SPH to it also.
What do you guys think?

Last fiddled with by Citrix on 2013-07-13 at 18:37
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Old 2013-07-13, 19:28   #48
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I thought PPsieve was only efficient for big k ranges (like PPS on PG)?

Something to consider though, a GPU uses 100Watt or more while sieving. A SB/IV bridge/ Haswell also uses something like 100Watt. Those CPUs can complete 4 first pass tests <2 days. For the PPsieve to be efficient in terms of eliminated factors/used power the GPU has to eliminate at least 2 candidates <2 days (and thus save 2 FP tests and 2 DC tests).
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Old 2013-07-13, 19:42   #49
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Quote:
Originally Posted by VictordeHolland View Post
I thought PPsieve was only efficient for big k ranges (like PPS on PG)?

Something to consider though, a GPU uses 100Watt or more while sieving. A SB/IV bridge/ Haswell also uses something like 100Watt. Those CPUs can complete 4 first pass tests <2 days. For the PPsieve to be efficient in terms of eliminated factors/used power the GPU has to eliminate at least 2 candidates <2 days (and thus save 2 FP tests and 2 DC tests).
We might be able to achieve this with PPsieve...if we include low weight properties of PSP ks.
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Old 2013-07-14, 07:29   #50
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Quote:
Originally Posted by Citrix View Post
I think this will be useful to avoid some PRP tests.
I think ppsieve can be made faster since the PSP k's are low weight and we can add SPH to it also.
What do you guys think?
To be honest, I have no idea. Based on my own tests, I would say that sieving is not efficirnt at this point. But obviously, all that changes if someone writes a ppsieve that works better in our scenario or if someone successfully ports sr2sieve to GPU (with improved speed).

-Kai
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Old 2013-07-14, 07:34   #51
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As an info. I had to fight with my migraine this weekend.
Its much better now but I want to take it easy.
So all the things I had promised for this weekend have to be moved a little bit.

Sorry for the delay.
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Old 2013-07-14, 07:54   #52
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Quote:
Originally Posted by opyrt View Post
To be honest, I have no idea. Based on my own tests, I would say that sieving is not efficirnt at this point. But obviously, all that changes if someone writes a ppsieve that works better in our scenario or if someone successfully ports sr2sieve to GPU (with improved speed).

-Kai
I am working on this. I know how to do this mathematically but not sure how to program a GPU (or test it..since I do not have one).

FYI: I did some theoretical testing... if we use the SPH algorithm and only test a range of 500K (n's) (e.g. 15-15.5 M) and only test 33% of all the primes in a range, we can be as fast or may be even faster than sr2sieve (in terms of rate of factors found; when comparing to sieving a 50M dat). This will definitely save some PRP tests.


If some one is good at programming I am willing to help them implement SPH for PSP. It can be done both on GPU or CPU.

Last fiddled with by Citrix on 2013-07-14 at 07:58
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Old 2013-08-06, 22:32   #53
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I finally was able to get access to a GPU. Does anyone have a copy of ppsieve CUDA for windows to play with?
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Old 2013-08-07, 10:09   #54
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Quote:
Originally Posted by Citrix View Post
I finally was able to get access to a GPU. Does anyone have a copy of ppsieve CUDA for windows to play with?
https://sites.google.com/site/kenscode/prime-programs
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Old 2013-10-01, 23:52   #55
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Is the PSP's stats website down? Could some one else confirm. I am having issues getting the webpage to load.
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