Understanding VDIFF SHA256 and Scrypt Pools

[crypto-expert]

Understanding VDIFF SHA256 and Scrypt Pools

[ahmedbodi]

Hi, well if you are using vardiff then that is correct what i personally do is set MPOS to 1, the pool target to 1 and the min target to 1 and then let them rise by themselves

[daygle]

You reply so fast to comments - your awesome!

Do you set this for both scrypt and SHA256 pools? or only SHA256?

So just to confirm you set the below:-

POOL_TARGET = 1
VARIABLE_DIFF = True
USE_COINDAEMON_DIFF = False
DIFF_UPDATE_FREQUENCY = 86400
VDIFF_MIN_TARGET = 1
VDIFF_MAX_TARGET = 1000
VDIFF_TARGET_TIME = 30
VDIFF_RETARGET_TIME = 120
VDIFF_VARIANCE_PERCENT = 20

I think I'll change mine to how you do it :)

[ahmedbodi]

i do this for both sha and scrypt pools im going to have a new update which is recommended which will set reduce the effectiveness of one of vardiffs flaws soon

[daygle]

Thank you so much for your help here! I look forward to your new update.

I have changed to the settings you have recommended and and they are running much better :).

[ahmedbodi]

nice +1 , no problem it should be out soon, if you like my work then please donate :)

[daygle]

Actually spoke to soon, after changing these settings my shares and invalids have skyrocketed. Other stats seem ok, like the hasrate and sharerate.

You can view by going to asc.coinz.pw.

Any ideas why? Is this an issue the update will fix?

More than happy to donate after this issue has been sorted :)

[educatedwarrior]

I've been watching this thread. This fixed my issue with share count not being displayed. I've been bugging Ahmed about this all weekend. Thanks.

[daygle]

Relised you can't see this without signing up to my website, here it is:-

Round Shares
Est. Shares 648953685 (done: 20.85%)
Pool Valid 135300053
Your Valid 135300053
Pool Invalid 0 (0%)
Your Invalid 0 (0%)

I only have the one worker :/.

educatedwarrier are your round share estimates doing this?

[educatedwarrior]

Yes I had same issue. At first I was having issues getting a sharecount at all, so I was happy to see some numbers. I raised the pool target and vardiff_min to 8 for my pool and that lowered the share count.

[ahmedbodi]

daygle yeah that will happen the first time it will settle down and stop

[daygle]

Thanks, I'll keep an eye on this and hope that it reports correct figures in the future :/.

[ahmedbodi]

Sure

[daygle]

Hmmmm something doesn't seem right. I left it settle and nothing changed - figures where extremely overstated.

The only way I can correct it is changing diff in MPOS to 20. Ahmedbodi are you using a MPOS front end? The MPOS mention some complicated formula used with pushpool, but I have no interest in pushpool as I don't have it installed.

[ahmedbodi]

Ahh yes I forgot to mention that u need to set mpos to use a diff of 16 I use mpos too btw

Glen [email protected] wrote:

Hmmmm something doesn't seem right. I left it settle and nothing changed - figures where extremely overstated.

The only way I can correct it is changing diff in MPOS to 20. Ahmedbodi are you using a MPOS front end? The MPOS mention some complicated formula used with pushpool, but I have no interest in pushpool as I don't have it installed.

---

Reply to this email directly or view it on GitHub:
ahmedbodi#7 (comment)

[daygle]

Arrhh ok... I have changed the MPOS to 16.

I'm still getting some crazy figures, I guess I'll see if it settles again?

[daygle]

I'm still not happy with the figures, I have changed the following:-

--Stratum Mining - Config.py---
POOL_TARGET = 1
VDIFF_MIN_TARGET = 1
VDIFF_MAX_TARGET = 600

--MPOS - global.inc.php--
$config['difficulty'] = 16;

Have I missed any other settings anywhere else?

[educatedwarrior]

Try restarting your webserver. The settings above worked great for me.
service apache2 restart

[daygle]

Nope restart didn't correct the issue.

What's your website I need to see for myself :)

[ahmedbodi]

wait till the round finishes and then take a look at statsthe number of shares is variable to the difficulty
e.g. a higher share diff = less shares needed
a lower share diff = more shares needed

[daygle]

Yeah I don't have much play around 20, I'll have a go when I get home.

There has to be a better way to change this.

I ended up logging a issue with Sebastian the guy who built MPOS. He suggests putting the vardiff and mpos difficulty back to how I had it in the first place. So confusing :/

[daygle]

Sebastian has advised that the coin I'm using isn't really supported with MPOS/VARDIFF kind of sucks - I have put a lot of hard work in to these pools.

Now my figures are ruined and I feel the SHA256 coins aren't fully supported :(

[ahmedbodi]

i cant really help with that u have to be willing to work with the coin and mpos and change whats needed to get it to work

[daygle]

OK thanks, I haven't given in yet! I'm playing with VARDIFF settings now

[daygle]

Ok after heaps of investigation and testing I can now say I know a hell of a lot more about difficulty between MPOS and stratum. I now understand it's all about fine tuning the settings and that each coins settings can vary from each other.

I say this as I have five mining pools and was under the assumption when I first logged this call that one setting fit all coins or type of coin.

I'm not sure if you want to keep this call open as you have assigned this call with the tag enhancement. I'll leave that up to you if you want to close :). Thanks for your help in relation to this.

[ahmedbodi]

Job Based Vardiff added, so now vardiff is 100% working closing as fixed :)