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Author Topic: [4+ EH] Slush Pool (slushpool.com); Overt AsicBoost; World First Mining Pool  (Read 4381851 times)
DutchBrat
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October 28, 2011, 06:51:58 AM
 #4181

Most of my miners are getting:

Pool not responding errors

Are we being attacked again Huh
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naypalm
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October 28, 2011, 06:59:36 AM
 #4182

Looks alright on my end  Undecided

slush (OP)
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October 29, 2011, 11:16:20 AM
Last edit: October 29, 2011, 11:31:17 AM by slush
 #4183

This weekend (29-30. October) I'm migrating pool from London (linode.com) to France (ovh.com). Although I believe everything will be fine, there will be at least one outage during database migration (probably something around 30 minutes).

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October 29, 2011, 03:11:11 PM
 #4184

Question for Slush:

In describing the logic/calculation of the score-based system, you mentioned this:

====
Matematically said, for every submitted share, pool perform

Code:
score = score + exp(round_time/C)

round_time is count of seconds between "now" and time when round started, C is magic constant which define how fast old shares lose their value. All following calculations are using C=300, but it may be changed in the future to provide the best cheatproof/usability ratio.

And on the end of round, system calculate rewards using formula

Code:
reward = user score / total score * 50
====

Is it really done for EVERY submitted share for EVERY user? that's a lot of calculations, no? or is there some other interval used to calculate the scores? maybe the scores are calculated at the end of each round?

please enlighten....

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October 29, 2011, 03:23:00 PM
 #4185

score = score + exp(round_time/C)

This is done for every submitted share immediately.

Quote
reward = user score / total score * 50

This is done on the end of round.

Quote
Is it really done for EVERY submitted share for EVERY user?

Yes, why not? It's one exponent function per share. With current multigigahertz machines it really isn't an issue :-).

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October 29, 2011, 03:29:25 PM
 #4186

score = score + exp(round_time/C)

This is done for every submitted share immediately.

Quote
reward = user score / total score * 50

This is done on the end of round.

Quote
Is it really done for EVERY submitted share for EVERY user?

Yes, why not? It's one exponent function per share. With current multigigahertz machines it really isn't an issue :-).

It's one exponent function per share PER USER. if you have 200 users you are doing this calculation 200 times for each share? then adding the new score to the cumulative score for each user and storing that in memory? for all the millions of shares?

not that it would be difficult for the modern pc, but my question is if it is done on an ongoing basis, then why does it take about 10 minutes to publish the rewards after each round?

BTW, thx for the lightning fast response Smiley

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October 29, 2011, 03:32:07 PM
 #4187

score = score + exp(round_time/C)

This is done for every submitted share immediately.

Quote
reward = user score / total score * 50

This is done on the end of round.

Quote
Is it really done for EVERY submitted share for EVERY user?

Yes, why not? It's one exponent function per share. With current multigigahertz machines it really isn't an issue :-).

It's one exponent function per share PER USER. if you have 200 users you are doing this calculation 200 times for each share? then adding the new score to the cumulative score for each user and storing that in memory? for all the millions of shares?

not that it would be difficult for the modern pc, but my question is if it is done on an ongoing basis, then why does it take about 10 minutes to publish the rewards after each round?

BTW, thx for the lightning fast response Smiley

sorry, just realized my mistake, a share is not submitted by multiple users and still be valid. so no need to multiply by number of users...

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October 29, 2011, 03:33:17 PM
 #4188

It is great mining for NMC in Slush's Pool but my luck is real bad on BTC for quite sometime.   
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October 29, 2011, 03:42:37 PM
 #4189

It is great mining for NMC in Slush's Pool but my luck is real bad on BTC for quite sometime.   

Is your expected round reward significantly lower than it should be? For eliminate effect of score based system, you can take last 50 round rewards and recalculate it with proportional method (your hashrate against pool hashrate, which is pretty constant around 1170 for last few days).

If this fits, then it's pool luck (well, we performed pretty bad last few days). If it don't fit, then we need to investigate more. Usually it's because of some connection troubles, rejected shares or crippled miner software or cards. Actually I don't have a reason to think there's some flaw in pool code, I didn't touch important stuff for many weeks and merged mining cannot affect this.

DutchBrat
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October 29, 2011, 03:43:19 PM
 #4190

It's a good thing luck evens out in infinity,

so give it a few more years and we will be alright  Wink

Brat
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October 29, 2011, 03:44:23 PM
 #4191

It's one exponent function per share PER USER. if you have 200 users you are doing this calculation 200 times for each share? then adding the new score to the cumulative score for each user and storing that in memory? for all the millions of shares?

As you already realized, score is calculated only for one share submit, not for submit*users :-).

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October 29, 2011, 05:05:03 PM
 #4192

I am experiencing a lot of:

'Pool not providing work fast enough'
'Pool not responding'

Errors

Is this because of the switch to a French provider ?
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October 29, 2011, 05:08:31 PM
 #4193

Is this because of the switch to a French provider ?

Not yet.

It's cgminer, right? Whats your ping to api.bitcoin.cz?

Edit: I'm monitoring pool response times once they took longer than 2 seconds; it happen time to time and it's an idicator that something is broken. But now there's no problem with response times, they're far under this threshold (actually most loaded pool backend has server load 0.15, which is excellent), so I don't see any reason why you should see this error.

Edit2: Also is there any ping packetloss?

DutchBrat
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October 29, 2011, 05:12:42 PM
 #4194

Pinging api.bitcoin.cz [178.79.183.97] with 32 bytes of data:

Reply from 178.79.183.97: bytes=32 time=6ms TTL=54
Reply from 178.79.183.97: bytes=32 time=6ms TTL=54
Reply from 178.79.183.97: bytes=32 time=6ms TTL=54
Reply from 178.79.183.97: bytes=32 time=6ms TTL=54

Looking good to me
slush (OP)
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October 29, 2011, 05:14:15 PM
 #4195

Pinging api.bitcoin.cz [178.79.183.97] with 32 bytes of data:

Looking good to me

Yes, it's fine. How often do you see that error? How long it is since last message?

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October 29, 2011, 05:17:32 PM
 #4196

Pinging api.bitcoin.cz [178.79.183.97] with 32 bytes of data:

Looking good to me

Yes, it's fine. How often do you see that error? How long it is since last message?

I've been seeing this off-and-on today, also with cgminer, going to api2.  I'm keeping an eye out for it happening again now..
DutchBrat
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October 29, 2011, 05:17:46 PM
 #4197

Maybe some 20 mins

My hashrate over all my miners is dropping steadily (this one miner hashes at around 280 MHash but has an avg of 213 MHash now, I restarted it 2 hours ago)

The estimated reward is also dropping from 0.08 to 0.049 at this very moment which is consistent with the drop in my hashrate because of the connection problems

Strange, maybe a hiccup on my own network

I'll let the ping run for a while
slush (OP)
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October 29, 2011, 05:27:34 PM
 #4198

What's your pool username? (I don't see submits from DutchBrat in last moments) I'll follow it on my side.

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October 29, 2011, 05:28:29 PM
 #4199

Username: dutchbratslaves

I am trying to copy paste the output of cgminer, but that proves more difficult than I thought  Grin
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October 29, 2011, 05:34:29 PM
 #4200

Hm, strange. Everything looks ok here, all your requests are responded in less than 5 miliseconds and I also don't see any rejected shares or so, which usually indicate some troubles.

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