CEMPLLA: An alternative to GIMPS ?

[LaurV]

I was thinking too that the second number must be bigger than the first, otherwise the sentence didn't seem to have sense. But then I said it must be some English trick which I am missing...
Yet, my house (computers, aircond, fridge inlcuded) costs me about $150-$200 for electricity monthly, at local energy prices.

[xilman]

Originally Posted by airsquirrels

While traveling I tossed the installer in a VM locked down with no network access. I nop'd the 5 GPU check and the Internet check and installed the full program. Peeking inside, the quality of code and general extreme dependence on open source libraries without a logical reason makes me suspect of any real improvements. I count OpenSSL and CURL alongside several others. Naturally without a cuda GPU it doesn't get very far.

I don't see anything that looks particularly malicious but I have definitely not done a deep forensic dive. Most of the code looks like it is indeed trying to detect normal things (processor instruction support, GPU capabilities, etc.) and doing its best to do an LL test. I don't see signs of any Bitcoin or lite coin algorithms.

I'll give it a little bit more time on an actual machine, but my gut here says good intentioned non-malicious program, no actual improvements over what we have, and an arguably more selfish author - which I won't fault him for.

Any GPL stuff in there?


If so, he can't legally distribute his binaries without also making the source available.

[Madpoo]

Originally Posted by xilman

Any GPL stuff in there?

If so, he can't legally distribute his binaries without also making the source available.

That's what I was thinking... just including CURL alone and not including the license would run him afoul of the open source agreements.

Depending on what other open source things he might have tucked away in there, he could even be (inadvertently, probably) using something that would then require the whole project to be open sourced, and I'm not entirely sure he considered all of that when gluing the program together.

As any Neal Stephenson book will tell, it doesn't matter how innovative you are, implementation matters. And you have to be able to beat the lawyers.

[ewmayer]

Originally Posted by Madpoo

That's what I was thinking... just including CURL alone and not including the license would run him afoul of the open source agreements.

Depending on what other open source things he might have tucked away in there, he could even be (inadvertently, probably) using something that would then require the whole project to be open sourced, and I'm not entirely sure he considered all of that when gluing the program together.

Whoops! And given the attitude expressed in his OP, your 'inadvertently' may be being too kind.

As any Neal Stephenson book will tell, it doesn't matter how innovative you are, implementation matters. And you have to be able to beat the lawyers.

I care less about 'the lawyers' than the simply courtesy of giving credit to the implementers of the software one is making use of in order (one hopes) to free up one's own innovative potential. It's the age-old 'standing on the shoulders of others' thing. But based on the few glimpses of 'innovation' we've been made privy to so far, I see no sign of anything innovative, unless one consider's the OP's 'sharing economy'-style 'you expend the cycles; I get the money and the glory' playbook to be 'innovative'.

But, I welcome the OP to prove me wrong on any of the above, if indeed I am wrong.

[lycorn]

Originally Posted by ewmayer

But, I welcome the OP to prove me wrong on any of the above, if indeed I am wrong.

Reckon you´re bound to wait a long time.
Last post from the OP was on the 17th. I really doubt we´ll ever heard of him again.
(Not that he´ll be missed, but hey...)

[Madpoo]

Originally Posted by airsquirrels

Cost is all relative to time. For example, an avid gamer who is poor with his money and upgrades to the latest and greatest every season just unloaded three Titan's already on EK water blocks for $1200. Add a Titan Z for another $1000 to the mix and you have 5 logical GPUs that will fit in one of my $1500 5930k hosts.

So that's a personal super computer for $3700. Not cheap, but not bad either. It is certainly less than the cost of a pair of nice 2011v3 E5 chips alone. That ignores my existing giant liquid cooling loop, but someone clever and thrifty could improve that enough for a small system like this fairly inexpensively.

If you want to go order this system off the shelf and just plug in power you will pay a lot more.

I should also mention that this system will pull every bit of 1.5kW. Around here that is about $100/month.

Oh, by the way... a dual Xeon E5-2697 v3 system wouldn't really *need* to cost the $10K I spent. Only reason mine cost that much is because it has a bunch of hard drives, it's an HP Proliant with built in caching array controller, has 256 GB of RAM, etc. It may have cost more than $10K now that I think about it...

Anyway, you could get a dual Xeon motherboard and a pair of CPUs to go into a regular desktop case. I'm not sure what kind of cooling it would need, but not much more than a single CPU system. TDP on those 2697 CPU's is 145W so get some good airflow is all I can say. Proliants have a bank of redundant fans across the front of the system and it's noisy as heck. You could mount some liquid coolers I guess.

Anyway, total cost would be less than what I said, with the biggest expense by far being the CPU's themselves. They're like $2600 each right now. More than a 5 GPU system, I guess. You might get a system like that put together with a minimum amount of DDR4 memory and a plain old hard drive for maybe $7K USD if you do some smart shopping and re-use an old case/power supply?

That's still way out of my personal budget, I'll point out. I upgraded my home machine to a 3770K a few years back and that was enough to last me for years... I don't do much hardcore computing at home.

[Madpoo]

Originally Posted by lycorn

Reckon you´re bound to wait a long time.
Last post from the OP was on the 17th. I really doubt we´ll ever heard of him again.
(Not that he´ll be missed, but hey...)

I'm sure he's just taking our kind suggestions and working them into version v2.0 (or would it be more accurate to say it was v0.02? Sure didn't seem like a v1.0 product).

[science_man_88]

OP probably wants something like this:

http://arstechnica.com/security/2012...rd-in-6-hours/

[mathPuzzles]

Version 1.5 announcement.

[CRGreathouse]

Some quotes:

CEMPLLA is very easy to use, and is currently the only software in the world capable of discovering the first one billion decimal digit prime number.

and

At the current time, there is no ongoing thread [on Mersenneforum.org] pertaining to the new version [CEMPLLA 1.5]. However, should there ever be one, you can be sure that it will not be on mersenneforum.com, as that site is maintained by GIMPS, or some subsidiary thereof, which neither the CEMPLLA effort, nor the author of CEMPLLA, is affiliated with in any way.

Clarifications in brackets are mine.

[science_man_88]

Originally Posted by CRGreathouse

Clarifications in brackets are mine.

well duh, it would be on mersenneforum.org