Need help with Nicehash

Encounter a problem related to the pool or have a request for a feature? Post your issue here and we will help you out.
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Welcome to the System Support forum! Encounter a problem related to the pool? Post your issue here and we will help you out.

Keep in mind that the forums are monitored by PROHASHING less closely than the official support channels, so if you have a pressing issue, please submit an official support ticket so that our Support Analyst can look into your issue in a timely manner.

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tradewiz
Posts: 42
Joined: Sun Sep 13, 2015 11:37 am

Re: Need help with Nicehash

Post by tradewiz » Sat Oct 24, 2015 12:19 pm

Thanks Steve! Here is the latest news feed on what litecoinpool merge mines: https://www.litecoinpool.org/news?id=63
Also see https://www.litecoinpool.org/news?id=65
Look forward for your results on Sunday!
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Steve Sokolowski
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Joined: Wed Aug 27, 2014 3:27 pm
Location: State College, PA

Re: Need help with Nicehash

Post by Steve Sokolowski » Sun Oct 25, 2015 4:51 pm

I read that page and I'm shocked.

You can't run a PPS pool with a 1.4% safety margin and remain profitable for a long time. Such a pool could go bankrupt very easily due to simple bad luck.

It's also bad business sense. They need to get 3.5x our hashrate at 1.4% just to make the same profitability as we do, assuming we were only mining litecoins.

Unfortunately, I have yet to get around to working on this issue because we had another problem with the AsianInvestmentBonds yesterday, our orphan rate calculations were off, and there was that bitcoin payout bug. Fortunately, I think these things are behind us and I should be able to look more info this now.
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Steve Sokolowski
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Joined: Wed Aug 27, 2014 3:27 pm
Location: State College, PA

Re: Need help with Nicehash

Post by Steve Sokolowski » Wed Oct 28, 2015 9:45 am

I wanted to provide an update on this issue.

Last night, Chris spent a long time trying to reproduce the issue in the development environment, but failed to do so. Having been frustrated, he started a production backup and went on to other tasks. But he quickly discovered that, when the production backup caused the database to get behind temporarily, hashrate decreased.

Today, he's going to set up a simulation in the development environment to try to get the database behind and see if he can reproduce the problem there. If the mining server is indeed slowing down on the database, then we should be able to investigate the issue easily.

Thanks to the users who pointed this out. We're making progress now!
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Steve Sokolowski
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Location: State College, PA

Re: Need help with Nicehash

Post by Steve Sokolowski » Thu Oct 29, 2015 8:22 am

We tried disabling three of the least profitable merge-mined coins.

Could anyone tell me whether this issue has been resolved?
Maznoz
Posts: 27
Joined: Thu Sep 03, 2015 6:02 am

Re: Need help with Nicehash

Post by Maznoz » Thu Oct 29, 2015 10:07 am

Without any fixed difficulty setting my order gets disconnected with the "Disconnected. Pool difficulty too low for high speed." error.
Maznoz
Posts: 27
Joined: Thu Sep 03, 2015 6:02 am

Re: Need help with Nicehash

Post by Maznoz » Thu Oct 29, 2015 10:08 am

Ah, it started again and seems to have received a proper difficulty (>1024) now.

Edit: And disconnected with too low difficulty again.
Maznoz
Posts: 27
Joined: Thu Sep 03, 2015 6:02 am

Re: Need help with Nicehash

Post by Maznoz » Thu Oct 29, 2015 10:30 am

Some details of an order running with a fixed difficulty of 8192 (apologies for the layout):

Code: Select all

From	                       2015-10-29 15:19:42             2015-10-29 15:12:42
To                            2015-10-29 15:24:42             2015-10-29 15:24:42
Speed at pool           0.4009 GH/s                           0.5750 GH/s
Speed paying 		0.4290 GH/s				0.6586 GH/s
Delta 			-0.0281 GH/s (-6.56%)		-0.0837 GH/s (-12.70%)
Rejected at pool 	0.0000 GH/s (0.00%)		0.0000 GH/s (0.00%)
Extra rewards 		0.0308 GH/s				0.0648 GH/s
Timed-out speed 	0.0000 GH/s				0.0000 GH/s
Rejects at pool
Share above target	0.0000 GH/s				0.0000 GH/s
Stale share		0.0000 GH/s				0.0000 GH/s
Duplicate share		0.0000 GH/s				0.0000 GH/s
Invalid nTime		0.0000 GH/s				0.0000 GH/s
Invalid worker		0.0000 GH/s				0.0000 GH/s
Other			0.0000 GH/s				0.0000 GH/s
As you can see most of the "loss" is due to the extra rewards, defined as "Extra speed this order paid to NiceHash miners as virtual shares due to fast job switching or disconnects.".

Hope this helps.
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Steve Sokolowski
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Location: State College, PA

Re: Need help with Nicehash

Post by Steve Sokolowski » Thu Oct 29, 2015 10:40 am

Maznoz,

try setting r=1.0 or r=0.0 and try again. Nicehash doesn't like work restart testing.
Maznoz
Posts: 27
Joined: Thu Sep 03, 2015 6:02 am

Re: Need help with Nicehash

Post by Maznoz » Thu Oct 29, 2015 11:29 am

Just setting r=0.0 and omitting the fixed difficulty results in the order being disconnected due to too low difficulty, however using r=0.0 d=8192 results in a running order, but first stats (only a couple of minutes) don't look to promising:

Speed at pool 0.1432 GH/s 0.0443 GH/s
Speed paying 0.1762 GH/s 0.0496 GH/s
Delta -0.0331 GH/s (-18.76%) -0.0053 GH/s (-10.68%)
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Steve Sokolowski
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Joined: Wed Aug 27, 2014 3:27 pm
Location: State College, PA

Re: Need help with Nicehash

Post by Steve Sokolowski » Thu Oct 29, 2015 11:38 am

Thanks for this. I just discovered a major issue that could cause work restarts to be sent to too many miners. I'm going to start testing it to see if this new code works. There was a variable that had been misspelled.

I'm going to change the pool's default difficulty from 1024 to 2048, because it seems that Nicehash thinks 1024 is too low now. Their difficulty settings seem to change constantly and are a huge problem.
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