[ANN] MemoryCoin

[Quirlorimbo]

i5 2500

4 core @ 11,5 h/s

[turtle83]

Last night benchmarked on cc2.8xlarge EC2 instance ( 2 x Intel Xeon E5-2670 processors) got ~35 h/s

Thats 16 physical cores, 32 threads

[B.T.Coin]

My client is stuck on block 586.
I have 6 connections and it thinks it's up to date but block 586 was issued at 14:54:00 and now it's 15:55:00, surely there must be newer blocks?
I already tried deleting the blockchain and reloading it but again it stops at 586.

EDIT: That's European times. I'm still stuck at this block, anybody see a higher block?

[stas]

same here

[stas]

have restarted the client . now it's on block 587

[B.T.Coin]

have restarted the client . now it's on block 587

I restarted my computer and got 587 now as well. It was issued at 16:07 so that was a very unlucky hour for all the miners.

[FreeTrade]

Last night benchmarked on cc2.8xlarge EC2 instance ( 2 x Intel Xeon E5-2670 processors) got ~35 h/s

Thats 16 physical cores, 32 threads

Thanks - looking at this and the i5, I'm concluding the bottleneck is at L2 Cache - having about 2MB available per thread is ratio to aim for.

Now, if my calculations are correct, at current difficulty,  0.00028632, each hash represents about a 1 in a million shot at solving the block.

Your EC2 instance is giving about 35*60*60 = 126,000 hashes per hour - you'd expect to solve one block every 8 hours.

To calculate the current cost of mining a block, what's the lowest price Amazon does that type of instance for? (I had a look at their pricing, but couldn't work it out)

[stas]

looks like this hour is gone be any better:)

[stas]

is NOT gone be

[stas]

looks like it's block per hour now

[FreeTrade]

Some nodes for anyone having trouble connecting

180.183.156.19
79.113.210.220
37.128.134.26
72.23.76.121
192.241.232.80
46.98.142.139
178.74.103.10

[B.T.Coin]

looks like it's block per hour now

Yes, it looks like that.
I don't know how the difficulty adjustment on this coin is, but it looks as if some miners have stopped and left difficulty high for the miners that are left.
We will see if the difficulty will drop in the next hours. I'm adding another 4-core machine later today but that will not make the difference I guess

[oroqen]

looks like it's block per hour now

block 585 - 10mins,
block 586 - 12mins,
block 587 - 1 hr,
block 588 - 41mins,
block 589 - 22mins,
block 590 - 9mins.

difficulty has fallen in the last hour or 2.

[turtle83]

Last night benchmarked on cc2.8xlarge EC2 instance ( 2 x Intel Xeon E5-2670 processors) got ~35 h/s

Thats 16 physical cores, 32 threads

Thanks - looking at this and the i5, I'm concluding the bottleneck is at L2 Cache - having about 2MB available per thread is ratio to aim for.

Now, if my calculations are correct, at current difficulty,  0.00028632, each hash represents about a 1 in a million shot at solving the block.

Your EC2 instance is giving about 35*60*60 = 126,000 hashes per hour - you'd expect to solve one block every 8 hours.

To calculate the current cost of mining a block, what's the lowest price Amazon does that type of instance for? (I had a look at their pricing, but couldn't work it out)

I nuked the instance after an hour... but.. its currently ~$0.253 / hour on spot.

note 8 hour is the maximum time taken to try out all possibilities for a single block. A block could be found sooner, other users could find a block in meantime needing a restart...

Taking your 8 hour estimate, for EC2 mining to be successful, a single block needs to be worth > $2.024  at current difficulty.

Another thing i noticed was while mining, the memory usage for bitcoind was swinging wildly from couple of megs to > 1 GB . Is it possible to allocate memory once and re-use that? I think a lot of time may be wasted in memory allocation and subsequent garbage collection.

Is there some documentation about the hashing algorithm used? (Sorry im not fluent in reading c++ code)

[FreeTrade]

I nuked the instance after an hour... but.. its currently ~$0.253 / hour on spot.

note 8 hour is the maximum time taken to try out all possibilities for a single block. A block could be found sooner, other users could find a block in meantime needing a restart...

Taking your 8 hour estimate, for EC2 mining to be successful, a single block needs to be worth > $2.024  at current difficulty.

Sounds right, thanks for the figures. So someone mining on EC2 would have about 8cents per coin production cost. (Note, difficulty seems to be high at the moment.)

Another thing i noticed was while mining, the memory usage for bitcoind was swinging wildly from couple of megs to > 1 GB . Is it possible to allocate memory once and re-use that? I think a lot of time may be wasted in memory allocation and subsequent garbage collection.

Yes, that optimization would likely improve hashrate. I'll bet someone has already done it.

Is there some documentation about the hashing algorithm used? (Sorry im not fluent in reading c++ code)

Not yet.

[Zyl]

This coin network is not working because of lack of UPnP support in the compiled release.

For many people, '1 active connection to Bitcoin network' = All orphans

Doing a release without UPnP support is a scam, because like you said, you'll make sure the blockchain stays protected.

[stas]

Actually it is working.
I have 8 connections to the network.
I have mined few blocks since it was lunched.
Didn't get any orphans.

right, it's not 2000 coins per minute like some other coins ... so because of that it's not working?

[B.T.Coin]

This coin network is not working because of lack of UPnP support in the compiled release.

For many people, '1 active connection to Bitcoin network' = All orphans

Doing a release without UPnP support is a scam, because like you said, you'll make sure the blockchain stays protected.

Just use the addnodes that are posted in this thread.
When I use these I have no problems connecting and I get 7 or 8 connections in a few minutes.

[FreeTrade]

Okay, fixed the slow startup problem - here's the link

https://docs.google.com/file/d/0B-5Ax5kejTpMTHZnUF80cGlFU1k/edit?usp=sharing

You'll have one more slow startup as it indexes, and after that startup will be . . . you'll be pleasantly surprised.

Also I've bundled VanityGen with a .bat file - click on that to create your own open-ended grant award addresses.  The last grant awarded only had 253 coins voting for it. Beat that and you'll get a free grant award.

[FreeTrade]

This coin network is not working because of lack of UPnP support in the compiled release.

I'd like to add this. If anybody has step-by-step instructions on how to compile this library and include on Windows - help would be gratefully accepted.