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Author Topic: LTC/ArtForz PushPool Question  (Read 2714 times)
wndrbr3d
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February 02, 2012, 09:56:26 PM
 #1

I'm trying to setup a private pool for my company and I have one question that I've seen discussed but not entirely in-depth.

The "rpc.target.bits" functionality is my biggest question. Do I need to adjust this manually with each difficulty change (since it seems to impact the # of shares submitted)?

Thanks!
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pooler
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February 02, 2012, 10:42:13 PM
 #2

I'm trying to setup a private pool for my company and I have one question that I've seen discussed but not entirely in-depth.

The "rpc.target.bits" functionality is my biggest question. Do I need to adjust this manually with each difficulty change (since it seems to impact the # of shares submitted)?

Thanks!

No, you don't need to change it when difficulty changes.
That setting rewrites the target in the work served to miners so that they look for shares instead of blocks.
In practice, you should probably set it to something between 16 and 18. The lower the number, the more shares pushpool will receive.

BTC: 15MRTcUweNVJbhTyH5rq9aeSdyigFrskqE · LTC: LTCPooLqTK1SANSNeTR63GbGwabTKEkuS7
wndrbr3d
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February 02, 2012, 10:51:17 PM
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No, you don't need to change it when difficulty changes.
That setting rewrites the target in the work served to miners so that they look for shares instead of blocks.
In practice, you should probably set it to something between 16 and 18. The lower the number, the more shares pushpool will receive.

Wouldn't the client submitting more shares impact a PPS pool's payout #'s?
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February 02, 2012, 10:57:46 PM
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No, you don't need to change it when difficulty changes.
That setting rewrites the target in the work served to miners so that they look for shares instead of blocks.
In practice, you should probably set it to something between 16 and 18. The lower the number, the more shares pushpool will receive.

Wouldn't the client submitting more shares impact a PPS pool's payout #'s?

That setting also defines how much a share is worth.
If you set it to N bits, miners will need to compute 2^N hashes on average in order to find a share.
So, for example, if you set N=16 you will receive twice as many shares than with N=17, but they will be worth half the value, so the result will be the same.

Bitcoin pools use a standardized value of 32 bits (i.e. difficulty 1); in the Litecoin world, however, no standard exists, although most pools use 16 or 17 bits.

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wndrbr3d
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February 03, 2012, 12:26:08 AM
 #5

That setting also defines how much a share is worth.
If you set it to N bits, miners will need to compute 2^N hashes on average in order to find a share.
So, for example, if you set N=16 you will receive twice as many shares than with N=17, but they will be worth half the value, so the result will be the same.

Bitcoin pools use a standardized value of 32 bits (i.e. difficulty 1); in the Litecoin world, however, no standard exists, although most pools use 16 or 17 bits.

Hmm, that seems a bit arbitrary, don't you think? Especially for the number of PPS pools that are out there. As a pool operator, I could set it to 18 and pay PPS on a lower volume of shares.
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February 03, 2012, 12:41:30 AM
 #6

That setting also defines how much a share is worth.
If you set it to N bits, miners will need to compute 2^N hashes on average in order to find a share.
So, for example, if you set N=16 you will receive twice as many shares than with N=17, but they will be worth half the value, so the result will be the same.

Bitcoin pools use a standardized value of 32 bits (i.e. difficulty 1); in the Litecoin world, however, no standard exists, although most pools use 16 or 17 bits.

Hmm, that seems a bit arbitrary, don't you think? Especially for the number of PPS pools that are out there. As a pool operator, I could set it to 18 and pay PPS on a lower volume of shares.

As I said, there would be fewer shares, but they would be worth more. The value (in LTC) of a share must be computed taking into consideration the current difficulty of the network and the target you serve to miners (which is determined by the setting you mentioned in the OP).

An example: suppose the current difficulty is 1. By definition of difficulty, this means that on average you need to compute 2^32 hashes in order to find a block worth 50 LTC. If you set a target of 17 bits, every share should be counted as 2^17 of those 2^32 theoretical hashes. So the PPS rate of a "2^17" pool will be two times the PPS rate of a "2^16" pool.

Of course this computation is only needed for PPS. In a proportional system the value of a share is not important.

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wndrbr3d
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July 21, 2012, 01:16:41 PM
 #7

Digging up an old thread because my question is related Wink

So PPS for a target.bits 17 pool would be: 50(32768/difficulty)

Correct? My logic being 2^16 is 65536, and 17 would be half as many shares required.
pooler
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July 21, 2012, 01:34:09 PM
 #8

Digging up an old thread because my question is related Wink

So PPS for a target.bits 17 pool would be: 50(32768/difficulty)

Correct? My logic being 2^16 is 65536, and 17 would be half as many shares required.

No. The higher target.bits, the lower (harder) the target.

If on average it takes 2^17 hashes to find a share, the PPS rate would be: 50 LTC / (2^32*difficulty) * 2^17.

The "2^32" part comes from the definition of difficulty: at difficulty 1 the expected number of hashes to compute in order to find a block is 2^32.

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wndrbr3d
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July 24, 2012, 12:25:23 PM
 #9

Digging up an old thread because my question is related Wink

So PPS for a target.bits 17 pool would be: 50(32768/difficulty)

Correct? My logic being 2^16 is 65536, and 17 would be half as many shares required.

No. The higher target.bits, the lower (harder) the target.

If on average it takes 2^17 hashes to find a share, the PPS rate would be: 50 LTC / (2^32*difficulty) * 2^17.

The "2^32" part comes from the definition of difficulty: at difficulty 1 the expected number of hashes to compute in order to find a block is 2^32.

Ah! Perfect. Thank you again for all your help! Smiley

So, perhaps a lower level question. I cloned ArtFortz's pushpoold git and built it on Ubuntu and it would seem that this version has a memory leak?

My friend and I are doing a private pool to combine our resources and I can't seem to keep pushpoold up for more than ~48 hours before it just quits out with no error message. Over that time period, I can see it using more and more memory.

Anyone experienced this? Any ideas?

Thanks again for your help!
pooler
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July 24, 2012, 01:21:51 PM
 #10

So, perhaps a lower level question. I cloned ArtFortz's pushpoold git and built it on Ubuntu and it would seem that this version has a memory leak?

My friend and I are doing a private pool to combine our resources and I can't seem to keep pushpoold up for more than ~48 hours before it just quits out with no error message. Over that time period, I can see it using more and more memory.

Anyone experienced this? Any ideas?

I've never found memory leaks in pushpool itself (kudos to jgarzik), but it is possible that the issue you are experiencing is caused by one of the dependencies.
Some versions of libevent, in particular, are affected by memory leaks, so try upgrading it.

BTC: 15MRTcUweNVJbhTyH5rq9aeSdyigFrskqE · LTC: LTCPooLqTK1SANSNeTR63GbGwabTKEkuS7
wndrbr3d
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July 24, 2012, 02:30:01 PM
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I've never found memory leaks in pushpool itself (kudos to jgarzik), but it is possible that the issue you are experiencing is caused by one of the dependencies.
Some versions of libevent, in particular, are affected by memory leaks, so try upgrading it.

Yeah, I got latest from repo before building. I'm not entirely sure even how to troubleshoot this one, but I guess I could just have bash do a while loop and just restart it on exit. Just sucks Tongue
wndrbr3d
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August 04, 2012, 01:43:49 PM
 #12

So then I start to wonder, how much memory does pushpoold use when under good load from litecoin miners? I ask because I'm running my instance on an Ubuntu EC2 small and I'm curious if the 1.5GB RAM isn't enough and THAT'S why pushpoold keeps quitting out after using up all the memory.
pooler
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August 04, 2012, 04:01:27 PM
 #13

So then I start to wonder, how much memory does pushpoold use when under good load from litecoin miners? I ask because I'm running my instance on an Ubuntu EC2 small and I'm curious if the 1.5GB RAM isn't enough and THAT'S why pushpoold keeps quitting out after using up all the memory.

Right now my pushpoold is using about 20 MB of memory, and I don't see why it would need much more than that. The Litecoin client, on the other hand, needs a good amount of RAM to run, often over 100 MB.
But even if we add to that the memory needed to run the database and a webserver, 1.5 GB is a lot.

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wndrbr3d
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August 04, 2012, 07:35:51 PM
 #14

Right now my pushpoold is using about 20 MB of memory, and I don't see why it would need much more than that. The Litecoin client, on the other hand, needs a good amount of RAM to run, often over 100 MB.
But even if we add to that the memory needed to run the database and a webserver, 1.5 GB is a lot.

Right, that's what I was thinking as well.

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 3486 ppdu      20   0  287m 113m  992 S  4.0 19.2   6:10.92 pushpoold

I'll try another linux flavor? Perhaps it's one of the libraries in the ubuntu repository causing it?
c4n10
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March 22, 2013, 11:01:01 PM
 #15

Hello,

This says it is litecoin compatible but is using bitcoin difficulty of 1... How can I adjust the share difficulty so it's appropriate for litecoin...?

Thanks!!!
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