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Author Topic: [ANN][BLC] Blakecoin Blake-256 for GPU/FPGA With Merged Mined Pools Stable Net  (Read 400906 times)
Hop_David
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February 09, 2014, 04:11:34 AM
 #1481

As a counter to this argument, I suggest you take a look a some of Tom Murphy's articles, starting with why not space.

Tom Murphy isn't dispassionate -- he has an ax to grind. He fancies himself a Paul Revere shouting an urgent message "Peak Oil is Coming! Peak Oil is Coming!" He is correct to urge us to conserve our resources. However he fears the prospect of space resources will lull us into complacency. Thus he starts with a preconceived conclusion and sets about to gather evidence to support what he's already decided is true.

And this leads to some horribly wrong math. A freshman aerospace student would recognize the way he patches conics is ridiculous. The only people who take Murphy's Why Not Space or Stranded Resources seriously are those who haven't done the math.
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rupy
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February 09, 2014, 10:35:35 AM
 #1482

patches conics

What does this mean?

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hamiltino
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February 09, 2014, 10:35:44 AM
 #1483

i'm getting an error trying to run cgminer-alt on windows:

libgcc_s_dw2-1 is missing from your computer.

Any suggestions?

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kramble
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February 09, 2014, 10:54:35 AM
 #1484


I didn't know myself either so I googled it. Try http://en.wikipedia.org/wiki/Patched_conic_approximation

Hugely off topic here though, Hop_David seems to have joined the forum just to reply to this one post Roll Eyes ... discussions on Limits To Growth do tend to become quite polarized, there seem to be almost religious attitudes on both sides of the debate. I suggest we just ignore these posts from now on (and I'm happy to delete this one if its just causing clutter).

i'm getting an error trying to run cgminer-alt on windows:

libgcc_s_dw2-1 is missing from your computer.

Any suggestions?

Did you download it from http://www.blakecoin.org/cgminer-alt-pool-eu.7z ? The libgcc_s_dw2-1.dll is included in the download. Perhaps you moved the cgminer.exe ? The DLL files need to be in the same directory as the EXE.

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hamiltino
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February 09, 2014, 11:01:53 AM
 #1485

i downloaded from the blakepool.org mining pool.

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kramble
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February 09, 2014, 11:07:39 AM
Last edit: February 09, 2014, 11:54:25 AM by kramble
 #1486

i downloaded from the blakepool.org mining pool.

Yes, the DLL does seem to be missing from the RAR. Try downloading the other version from http://www.blakecoin.org/cgminer-alt-pool-eu.7z as it should work OK on all the pools. If you really do want to use the blakecoinpool version, then you could try copying the missing DLL from this version, though it's not guaranteed to be compatible, the versions are actually identical.

EDIT You'll need to check the cgminer.conf as these differ. Use the one for the pool you want to connect to, or customize it to failover between pools (there are some posts by bluedragon upthread that give some details). You'll need have the right username, worker and password for each pool as using the wrong one may just result in shares being silently lost. Confirm you are getting shares accepted via the pool dashboard.

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BlueDragon747
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February 09, 2014, 06:45:45 PM
 #1487

I noticed that kr105's pool www.blakecoinpool.org has a very long round and could be an issue might be best to change pools until he has had a look at it

both versions of cgminer for pool are the same but kr105's is missing that dll only real difference  Cool

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ByronP
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February 09, 2014, 06:49:28 PM
 #1488

BD we need a better explorer so we can get blc pushed onto the market lists
BlueDragon747
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February 09, 2014, 06:53:36 PM
 #1489

BD we need a better explorer so we can get blc pushed onto the market lists

I have been working on a new site with integrated explorer  Cheesy

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Hop_David
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February 09, 2014, 07:33:46 PM
 #1490


Good reference. The orbits in two body systems are conic sections: circle, ellipse, parabola, hyperbola. Within earth's neighborhood a Mars transfer orbit would be a hyperbola with regard to the earth with a focus at earth's center. But once outside the earth's neighborhood, this path would be modeled as an ellipse with the sun at a focus.

Hugely off topic here though

Well then, it was your hugely off topic post I was replying to.


, Hop_David seems to have joined the forum just to reply to this one post Roll Eyes

Indeed. I Google for Why Not Space or Stranded Resources. When I see someone repeating Murphy's misinformation, I challenge it.

... discussions on Limits To Growth do tend to become quite polarized, there seem to be almost religious attitudes on both sides of the debate.

Right. It's a complicated and important topic. There are zealots on both sides. And I admit I am not dispassionate.

I offer my math and a critique of Murphy's math. I ask people to take the time and effort to study what's going on so they can have an informed opinion.

In the case of patched conics, the speed of a hyperbola is sqrt(Vesc^2 + Vinf^2)
where Vesc is escape velocity and Vinf is the difference between earth's velocity (about 30 km/s) and perihelion velocity of a heliocentric transfer orbit. For a Mars Hohmann transfer orbit, Vinf is about 3 km/s.

When I see sqrt(a^2 + b^2) it's my habit to think of the pythagorean theorem. And that's how I visualize the speed of a hyperbola: as the hypotenuse of a right triangle with Vesc and Vinf as legs.

Thus the speed for Trans Mars Injection hyperbola would be sort(11^2 + 3^2) km/s which is about 11.4 km/s. Murphy commits a very common mistake, he just adds 11 and 3 to get 14 km/s. He also neglects aerobraking and delta V savings that can be had from 3 body mechanics. From a high school student these would be forgivable errors. From someone with Murphy's credentials, they are inexcusable.

There are many serious flaws in Murphy's arguments. I talk about them at Murphy's Mangled Math

And with that I will bow out. Out of respect for other readers I will no longer participate in the hugely off topic sub-thread Kramble has started on this forum.
dreamwatcher
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February 09, 2014, 08:08:56 PM
 #1491

BD we need a better explorer so we can get blc pushed onto the market lists

I have been working on a new site with integrated explorer  Cheesy

I see the current explorer is an ABE based explorer, and I am wondering why that is stopping Blake from getting on market lists. ABE is pretty much the standard block explorer framework for alt-coins.

My new design, CCE3, is not ready for full release because my priorities shifted to the SCIFI coins. In fact it is missing what most of these market lists want, an API.

Though I have refused to make or serve any new coin explorers until CCE3 is finished and all of CCE has been converted, I would be willing to make an exception for Blakecoin and serve an ABE based explorer on CCE.

This also would give Blakecoin the benefit of being grandfathered in before I change the CCE business model after the full CCE3 release and conversion.

For those not familiar with CCE:

www.cryptocoinexplorer.com

One of the CCE3 test explorers:

http://ufc.cryptocoinexplorer.com/
BlueDragon747
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February 09, 2014, 08:13:38 PM
 #1492

BD we need a better explorer so we can get blc pushed onto the market lists

I have been working on a new site with integrated explorer  Cheesy

I see the current explorer is an ABE based explorer, and I am wondering why that is stopping Blake from getting on market lists. ABE is pretty much the standard block explorer framework for alt-coins.

My new design, CCE3, is not ready for full release because my priorities shifted to the SCIFI coins. In fact it is missing what most of these market lists want, an API.

Though I have refused to make or serve any new coin explorers until CCE3 is finished and all of CCE has been converted, I would be willing to make an exception for Blakecoin and serve an ABE based explorer on CCE.

This also would give Blakecoin the benefit of being grandfathered in before I change the CCE business model after the full CCE3 release and conversion.

For those not familiar with CCE:

www.cryptocoinexplorer.com

One of the CCE3 test explorers:

http://ufc.cryptocoinexplorer.com/

That would be very cool  Grin

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dreamwatcher
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February 09, 2014, 11:48:28 PM
 #1493

Blakecoin is now on CCE.

The only ABE based explorer to be added in quite some time. Seeing as my relaunch of UFC was based on Blakecoin, I thought it appropriate to give back to the Blakecoin community.

http://blc.cryptocoinexplorer.com/

I will also be setting up a CCE3 test explorer for Blakecoin.
mogrith
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February 10, 2014, 12:42:44 AM
 #1494

Blakecoin is now on CCE.

The only ABE based explorer to be added in quite some time. Seeing as my relaunch of UFC was based on Blakecoin, I thought it appropriate to give back to the Blakecoin community.

http://blc.cryptocoinexplorer.com/

I will also be setting up a CCE3 test explorer for Blakecoin.


Nice I have been using your explorers for a while now thanks for adding this one

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dreamwatcher
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February 10, 2014, 12:46:28 AM
 #1495

Blakecoin now has a CCE3 explorer:


blake.cryptocoinexplorer.com

I may be a "bit" bias, but I much prefer the CCE3 explorer for everyday use.  Grin
BlueDragon747
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February 10, 2014, 01:03:17 AM
 #1496

Blakecoin is now on CCE.

The only ABE based explorer to be added in quite some time. Seeing as my relaunch of UFC was based on Blakecoin, I thought it appropriate to give back to the Blakecoin community.

http://blc.cryptocoinexplorer.com/

I will also be setting up a CCE3 test explorer for Blakecoin.


Blakecoin now has a CCE3 explorer:


blake.cryptocoinexplorer.com

I may be a "bit" bias, but I much prefer the CCE3 explorer for everyday use.  Grin

Awesome this really made my day thanks Grin

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February 10, 2014, 04:20:54 AM
 #1497

yeah that is nice to see, thanks for the block explorer dreamwatcher  Grin
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February 10, 2014, 09:28:08 AM
 #1498

Hop_David seems to have joined the forum just to reply to this one post Roll Eyes
Indeed. I Google for Why Not Space or Stranded Resources. When I see someone repeating Murphy's misinformation, I challenge it.
Is it because you believe in infinite growth or because you are a Trekkie?

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February 10, 2014, 09:50:06 AM
 #1499

@kramble I'm thinking of running my FPGAs without fan. I have a big heatsink on them, at which frequency would the theoretical heat be ok for long duration hashing without damaging the Spartan-6 chips?

At 172MHz they don't seem to produce that much heat...

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February 10, 2014, 10:55:37 AM
Last edit: February 10, 2014, 11:43:31 AM by kramble
 #1500

@kramble I'm thinking of running my FPGAs without fan. I have a big heatsink on them, at which frequency would the theoretical heat be ok for long duration hashing without damaging the Spartan-6 chips?

At 172MHz they don't seem to produce that much heat...

I'm not a professional electronic engineer, so this is just amateur advice. Provided the heatsink is properly installed (good thermal paste and firm mechanical contact with the FPGA package), then as long as it's not too hot to touch (around 60C) you will be fine.

The professionals would use the following information to size the heatsink correctly:

The FPGA manufacturers specify a maximum operating junction temperature of 85C for commercial parts (see table 2 here), with an absolute maximum of 125C. You need to allow for the thermal resistance of the packaging here, where the important value is ΘJC (junction to case thermal resistance) at 3.7C/W for the FGG484 package and 2.2C/W for the CSG484 used in the ztex, then add the thermal resistance for the heatsink thermal paste, and the heatsink itself. This is all then multiplied by the expected power dissipation to give the temperature rise over ambient (ie the max operating temperature given in the consumer handbook for the product). Then they juggle the choice of cooling solution (heatsink+fan) so that the junction temperature stays below 85C.

The power dissipation depends on the clock frequency, and also (to some extent) the characteristics of the individual chips as manufactured, so estimating the power dissipation during the design phase is an important task (and well beyond my expertise).

Anyway, you can see why I'm not going to be able give an absolute figure, hence my "suck it and see" response above. In practice I'd just ramp the clock up until it starts giving hardware errors, then back off a bit. Then monitor the heatsink temperature to check it's not getting too hot over a period of time (the finger-test is a reasonable approximation). Be prepared to re-evaluate if the operating conditions change (eg from winter to summer).

The ztex are a bit awkward to judge the best clock speed as they seem to give hardware errors even during normal operation (probably a bug in the communication protocol, either in the driver or the FPGA code). The max clock will vary between individual devices, so the cgminer clock parameters allow each to be set individually. You should expect to achieve around 200MHz for the -3 speed grade devices (a little less for the cheaper clones using -2 speed grade). I run my lancelot at 195MHz and I was getting 220MHz for one of the devices on BlueDragon's CM1.

Also you may find you can achieve a faster clock speed if you run the device cooler (silicon generally gives better performance at lower temperatures), so its up to you to decide the acceptable trade-off between perhaps a lower clock speed with no fan cooling, and a higher clock speed with a fan (and its associated noise).

PS I did find that both the ztex 1.15y and CM1 boards I had on loan from BlueDragon did overheat if I forgot to turn the fan on (sorry Blue, no damage done though). I only noticed when the boards stated to smell hot!  (I was using a separate FAN PSU initially, all a bit Heat Robinson/Rube Goldberg as Blue didn't include the fans to save on postage costs).

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