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post #161 of 170 (permalink) Old 04-01-2019, 03:16 PM
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post #162 of 170 (permalink) Old 04-06-2019, 01:27 PM
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A new NF CPU app. It kind of makes the GPU app even less fruitful to users as it was reduced while CPU credit stayed the same. More science is being done though.

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So there have been some new developments over the last week. It's both good and bad.

First of all, some history. The reason I waited so long to develop a GPU app is because the calculation was heavily dependent on multi-precision libraries (gmp) and number theoretic libraries (pari/gp). Both of these use dynamically allocated memory which is a big no-no in GPUs. I found a multi-precision library online that I could use by hard coding the precision to the maximum required (about 750 bits), thereby removing the dependence on memory allocations. The next piece of the puzzle was to code up a polynomial discriminant function. After doing this, I could finally compile a kernel for the GPU. That is the history for the current GPU app. It is about 20 to 30 times faster than the current cpu version (depends on WU and cpu/gpu speeds).

But then I got thinking... my GPU polynomial discriminant algorithm is different from the one in the PARI library (theirs works for any degree and mine is specialized to degree 10). So to do a true apples-to-apples comparison, I replaced the PARI algorithm with mine in the cpu version of the code. I was shocked by what I found... the cpu version was now about 10x faster than it used to be. I never thought I was capable of writing an algorithm that would be 10x faster than a well established library function. ***? Now I'm kicking myself in the butt for not having done this sooner!

This brings mixed emotions. On one side, it is great that I now have a cpu version that is 10x faster. But it also means that my GPU code is total crap. With all the horsepower in a present day GPU I would expect it to be at least 10x faster than the equivalent cpu version. Compared with the new cpu version, the gpu is only 2 to 3 times faster. That is unacceptable.

So the new plan is as follows:
1. Deploy new cpu executables. Since it's 10x faster, I will need to drop the credit by a factor of 10. (Credits/hour will remain the same for the cpu but will obviously drop for the GPU)
2. Develop new and improved GPU kernels.

I don't blame the GPU users for jumping ship at this point. Frankly, the inefficiency of the current GPU app just makes it not worth it (for them or the project).

For what it's worth, I did have openCL versions built. Nvidia version works perfectly. The AMD version is buggy for some reason, as is the windows version. Since I will be changing the kernels anyways, there is no point in debugging them yet.
https://numberfields.asu.edu/NumberF...hp?id=366#2360


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post #163 of 170 (permalink) Old 04-07-2019, 06:15 AM
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Found some interesting info scrounging around the S-G site regarding this years Pentathlon.
Looks like a WCG subproject to be named has been chosen in advance for the Marathon discipline.
Also a new discipline called Javelin Throw will replace Swimming and adds an interesting new twist.

See Here
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post #164 of 170 (permalink) Old 04-07-2019, 11:54 AM
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Interesting I wonder how much advance notice they will give on each of the 5 one day segments.

Quote:I'm gonna throw in my 2 cents. Not because I'm an expert but because I have a keyboard.


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post #165 of 170 (permalink) Old 04-17-2019, 05:32 PM
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Free-DC has this notice up. It's one of the few sites where I turn uBlock off.

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Free-DC is unfortunately running very low on funds (< $60) and I can probably only justify sustaining this for a few more months. Bandwidth alone is >$100 per month. I've been running the sites for almost 20years now. If you are interested in seeing this continue, please consider donating via the link on the left side.


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post #166 of 170 (permalink) Old 04-17-2019, 06:34 PM
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Glad you hopped on and posted this here. Free-DC is a great site, and would be missed if it went offline.


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post #167 of 170 (permalink) Old 04-24-2019, 05:39 AM
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New project on the horizon (under development): [email protected] Can't post a link due to a character in the url which for the life of me I can't find on my keyboard (one of those squiggly lines sometimes found above letters in some Spanish names). A simple Google search will bring it up.

Edit: Found it: https://math.wvu.edu/~zetienne/SENR/

Last edited by skivelitis; 04-24-2019 at 06:09 AM.
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post #168 of 170 (permalink) Old 05-02-2019, 06:19 AM
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Quote: Originally Posted by skivelitis View Post
New project on the horizon (under development): [email protected] Can't post a link due to a character in the url which for the life of me I can't find on my keyboard (one of those squiggly lines sometimes found above letters in some Spanish names). A simple Google search will bring it up.

Edit: Found it: https://math.wvu.edu/~zetienne/SENR/
The Tilde key? (Shift + `) Should be to the left of your 1 key on your keyboard.
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Last edited by Finrond; 05-02-2019 at 06:24 AM.
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post #169 of 170 (permalink) Old 05-02-2019, 06:30 AM
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Quote: Originally Posted by Finrond View Post
The Tilde key? (Shift + `) Should be to the left of your 1 key on your keyboard.
That was the one! I eventually found it. Laptop I was on at the time is in my basement workshop. Need to wipe off the keyboard more often!
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post #170 of 170 (permalink) Old 05-16-2019, 03:43 PM
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With [email protected] Pent over I went back to GPUGrid but their license expired so all tasks error out. The project is limited to Windows GPU work and CPU tasks atm.


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