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Author Topic: [2.5+ EH] Slush Pool (slushpool.com); World's First Mining Pool  (Read 4326006 times)
eleuthria
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October 18, 2015, 08:52:40 PM
 #21301

Presumably everything has slowed down due to the extra load of having so much hashrate on his pool. Since slush's pool code is python, it's likely just the slowdown of python not scaling to the greater number of clients it's seeing. He either needs more mining nodes or better software.

From memory, slush's pool used to prioritise which clients got block updates first - since it takes time to send updates to all the miners, he prioritised the biggest miners first so all the small miners used to get the block change later. Perhaps even that workaround is no longer enough.

I'd assume something else is the issue.  I highly doubt he has more active miners than ever, just higher speed ones.  There's way fewer small fries out there today than there were a year or more ago.  In a proper implementation of vardiff, the speed of connected miners should have absolutely no impact on actual server load, only the number of miners in general.

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October 18, 2015, 09:05:37 PM
 #21302

Presumably everything has slowed down due to the extra load of having so much hashrate on his pool. Since slush's pool code is python, it's likely just the slowdown of python not scaling to the greater number of clients it's seeing. He either needs more mining nodes or better software.

From memory, slush's pool used to prioritise which clients got block updates first - since it takes time to send updates to all the miners, he prioritised the biggest miners first so all the small miners used to get the block change later. Perhaps even that workaround is no longer enough.

I'd assume something else is the issue.  I highly doubt he has more active miners than ever, just higher speed ones.  There's way fewer small fries out there today than there were a year or more ago.  In a proper implementation of vardiff, the speed of connected miners should have absolutely no impact on actual server load, only the number of miners in general.
Well, probably that in combination with bitcoinds that haven't been optimised to cope in this transaction spam environment which can cause massive mempool and cpu blowouts and subsequently very slow block changes/getblocktemplate calls.

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doubletap1911
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October 18, 2015, 09:17:38 PM
 #21303

In an email reply I received from Slush inquiring about the abnormally high invalid blocks he responded by stating "it was a matter of chance to end up with invalid block".  And additionally stating "We don't have direct impact over this behavior.  Invalid blocks are natural part of the Blockchain ecosystem..."

Do all of you agree with this?
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October 18, 2015, 09:23:37 PM
 #21304

In an email reply I received from Slush inquiring about the abnormally high invalid blocks he responded by stating "it was a matter of chance to end up with invalid block".  And additionally stating "We don't have direct impact over this behavior.  Invalid blocks are natural part of the Blockchain ecosystem..."

Do all of you agree with this?
It is an expected phenomenon of the way blocks propagate that orphans will eventually occur, but it is the responsibility of the pool owner to optimise their design to minimise this effect. Having orphans is expected, yes, but having a high rate of orphans is not expected. Check the orphan rates of other pools. The percentage should be about the same for all pools, irrespective of their size, though statistically it would be hard to get an accurate percentage on smaller pools simply because of the number of blocks solved.

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eleuthria
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October 18, 2015, 09:25:40 PM
 #21305

In an email reply I received from Slush inquiring about the abnormally high invalid blocks he responded by stating "it was a matter of chance to end up with invalid block".  And additionally stating "We don't have direct impact over this behavior.  Invalid blocks are natural part of the Blockchain ecosystem..."

Do all of you agree with this?

There will always be *some* chance involved in orphan blocks.  But he's lyingdishonest in saying that you don't have direct impact over the behavior.  If your orphan rate is above ~1%, you have something wrong.


EDIT:  9 of his last 200 blocks have been orphaned.  There is CLEARLY something wrong with either the hardware, software, or network level for Slush.

RIP BTC Guild, April 2011 - June 2015
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October 18, 2015, 09:55:38 PM
 #21306

Pool should be more reliable to this kind of issue...

For the last fews days we got really bad luck, combined with TOO MANY orphans.

I see a lot bad luck from slush but not so many lucky nowadays...  Maybe -Ck is right and they have a real network issue at this point.

With all the recent Dashboard issue and the 1.3 orphan per day rate... Something is wrong.

I wonder if Slush would ever compensate their top Miner  for this mess up... I Can't imagine running 1PH and not wanting to go straight to Slush HQ after LOSING more than 10BTC in revenue in the last week from invalidated block.
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October 18, 2015, 09:58:26 PM
 #21307

/Rant


I would really like slush to fix the Luck % right after an invalidated block...

80% for this day is not right. It's like 52% according to my (weak) math.
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October 19, 2015, 06:02:29 AM
 #21308

Block ID 25170 another invalid  Angry

get.uber.com/drive/?invite_code=brianp6308ue
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October 19, 2015, 10:28:19 AM
 #21309

I don't want to jump ship but I may have to do so...

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October 19, 2015, 10:35:42 AM
 #21310

only 7 blocks yesterday.

Today only 3 blocks. Not good for users with very small hash power Sad
Rikim4ru
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October 19, 2015, 10:48:00 AM
 #21311

Not good for huge hash power either!!!!!

IF AT LEAST those orphan were buried under a piles of Great Luck.... But it's quite the oppposite

I hope someone can Kick the box again and fix the luck  xD



Last 72 hours have been VERY terrible...
And the luck rating INCLUDE, all the past invalid block. So imagine that....

Still below 50% for 3 days straight.... For a 30 PH pool? BAH.


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October 19, 2015, 11:54:23 AM
 #21312

Up for another 9+hours Block?

-Sorry- I just can't believe how we can be hit by such bad luck. Consecutively.


Wtf.
sky_g
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October 19, 2015, 11:58:45 AM
 #21313

Up for another 9+hours Block?

-Sorry- I just can't believe how we can be hit by such bad luck. Consecutively.


Wtf.

3 invalid blocks in last 4 days toooooooooooooo
spazzdla
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October 19, 2015, 12:30:00 PM
 #21314

What is with the NMC stuff.. is the pool insta selling it and giving us the BTC?
Rikim4ru
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October 19, 2015, 12:55:45 PM
 #21315

What is with the NMC stuff.. is the pool insta selling it and giving us the BTC?

Yes.

They might implement nmc deposit soon, but right now it's the way it is.
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October 19, 2015, 01:45:08 PM
 #21316

What is with the NMC stuff.. is the pool insta selling it and giving us the BTC?

Yes.

They might implement nmc deposit soon, but right now it's the way it is.

Neato.
doubletap1911
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October 19, 2015, 06:47:42 PM
 #21317

I received another reply today from Slush regarding the recent influx of invalid blocks.

Quote
Thank you for pointing our attention to this situation. We understand your disappointment and are ready to provide you with more detailed explanation, please read below.

The primary reason for this behavior was recent malleability attack on Bitcoin network which caused the Bitcoind overload with transactions and directly affected the ability to propagate blocks into the network.
Not only our nodes were affected but many other nodes across entire BTC network as well.

Bitcoind 0.11.1 which was released 4 days ago contained bug fixes for these malleability attacks. We were testing it in the meantime in order to make sure we do will not cause any harm on our infrastructure and do not affect the
hash rate of our miners. We were stuck between a rock and a hard place these few days. But the unacceptable rise in number of invalid blocks forced us to act quickly. We would like to assure you that the new version of Bitcoind was successfully deployed on every node we use for our mining and blocks propagation. As a consequence we expect significant reduction in invalid blocks appearance in the next few days.

We hope you understand our struggle with the malleability attack and stay with us despite few bad days.
We are quick learners and are taking lessons from this experience which is going to have positive effect on your experience with our pool in the future

Martin
Customer support

SatoshiLabs
CoinMap | Slush's Pool | TREZOR

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October 19, 2015, 08:25:05 PM
 #21318

I received another reply today from Slush regarding the recent influx of invalid blocks.

Quote
The primary reason for this behavior was recent malleability attack on Bitcoin network which caused the Bitcoind overload with transactions and directly affected the ability to propagate blocks into the network.
Not only our nodes were affected but many other nodes across entire BTC network as well.



Which is what I said.

Well, probably that in combination with bitcoinds that haven't been optimised to cope in this transaction spam environment which can cause massive mempool and cpu blowouts and subsequently very slow block changes/getblocktemplate calls.

In other words slush hadn't manage to optimise his bitcoinds to cope under the circumstances and ended up depending on the newer bitcoind version to fix it. While he says many other nodes were affected, there were pools that were not.

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October 19, 2015, 09:08:25 PM
 #21319

So now that he has applied this fix have things gotten any better?

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October 20, 2015, 12:30:56 AM
 #21320

So now that he has applied this fix have things gotten any better?

No invalid blocks today and our luck looks like it is turning around as well.
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