Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v15.0 (Windows/Linux)

[Blamsud]

Hello

I do not understand what to put in the command line for the DCR?

Do not put wallet address?

Login and pass the pool account?

i use claymore :

EthDcrMiner64.exe -epool eth-eu1.nanopool.org:9999 -ewal 0x242a8722fE288FCA7eF03b627D0C78799166C695/PC/bgs.mathieu59@gmail.com -dpool stratum+tcp://dcr.suprnova.cc:2252  -dwal DskqH7NwywxaaYENnQt6kBz28aBzKUUdFjb.PC -dpsw x -allpools 1 -r 1 -dcri 30


command ok ?


DCR share rejected ................ Huh

Did anyone ever reply to you?

On Suprnova you use a username to login to suprnova across all their pools. You need to register on suprnova to get that username.  Once you have that username you use it instead of your wallet address. Your wallet address is kept inside suprnova under your account settings.

so your command line would look something like:

Code:

EthDcrMiner64.exe -epool eth-eu1.nanopool.org:9999 -ewal 0x242a8722fE288FCA7eF03b627D0C78799166C695/PC/bgs.mathieu59@gmail.com -dpool stratum+tcp://dcr.suprnova.cc:2252  -dwal username.workername -dpsw x -allpools 1 -r 1 -dcri 30 -dcoin dcr

As stated I don't think you have to use the -dcoin but it's good practice to use anyway.

After you register on suprnova click on "My Account" in the left hand navigation. Then click on "Edit Account". That's where you'll be able to add your wallet address and configure how often you want payouts.

for me -dpool stratum+tcp://dcr.suprnova.cc:2252 is not working, but -dpool dcr.suprnova.cc:2252

Similar here, I cannot use http://

[Qazo]

You are forcing max load limits on your PSU. Consider adding a second PSU.

You want to undervolt to lower the energy consumption. Somewhere between 900mv to 950mv should work well. maybe even 880mv if you're lucky. Make sure you reduce both core and mem voltage to same value too

so after little bit tuning today, I got this


and from wall




GPU2 was hanging on these setup so I only set that card to 950mv , it's stable now (will test overnight)

-dcri 30, if I set it to 35 I get 10mh/s less on ETH and only 300 mhs more on DCR - not worth it and 30W more power consumption

In the end
power consumption lowered by 7% and mhs and power are much more stable now

[doktor83]

all of your cards can handle 2150mhz mem ?

[Qazo]

yes, for now    i tried to raise memory more but didn't get better result

i only modified straps 1750-2000, nothing else, very happy with results

[fittsy]

for me -dpool stratum+tcp://dcr.suprnova.cc:2252 is not working, but -dpool dcr.suprnova.cc:2252

You're right. I hadn't had enough coffee and didn't even notice that!

I'll correct my original post for future people who might want to copy/paste.  Thanks for helping me out.

[doktor83]

yes, for now    i tried to raise memory more but didn't get better result

i only modified straps 1750-2000, nothing else, very happy with results

Try 1130/2150, maybe you get more, i think 1075 is too low.

[Qazo]

yes, for now    i tried to raise memory more but didn't get better result

i only modified straps 1750-2000, nothing else, very happy with results

Try 1130/2150, maybe you get more, i think 1075 is too low.

no man, i have problem with power consumption, i'm on limit - with last settings (2-3 pages before) I got 980w from my corsair rm1000x and I it was too much.
Already tried, if I raise core clock on all cards to 1080 mhz my power meter read more than 1000w from wall

[AltScope]

The main reason for fluctuations  for 9.0 vs 8.0 is low Dcri.
For my rx470 if i set dcri less than 23 for example i notice that the power graph provided by afterburner will fluctuate every few seconds , showing that GPU power is reduced for some reason , and it happens like a clock , if i increase dcri the problem disappear .

im in a weird boat

both cards are rx480 8GB ones a sapphire the others an asus. if i set dcri to 25-35 the asus speed dips, if i set dcri to 40-50 the asus runs smooth if hot and the sapphire speeds dip. so i tried setting dcri to 30, 45 in my conf and the sapphire speed still dips  

ive left it at those settings as im getting 41-48mh eth and 2gh dcr

[Pvpmedics]

There is a lot of pages on this forum post about the duel mining. I have been looking through them but didnt notice anything about ETH and ETC duel mining. Is this possible with this miner? If so can someone post the proper way to do this with nvidia cards?

Thank you,
Pvpmedic

[vapourminer]

ETH and ETC duel mining. Is this possible with this miner? I

nope cant do it. one or the other, plus a second coin like decred or sia

[Pvpmedics]

Well shoot that is lame, ok thank you for the quick response

[vanhalendlrband]

Hello

I do not understand what to put in the command line for the DCR?

Do not put wallet address?

Login and pass the pool account?

i use claymore :

EthDcrMiner64.exe -epool eth-eu1.nanopool.org:9999 -ewal 0x242a8722fE288FCA7eF03b627D0C78799166C695/PC/bgs.mathieu59@gmail.com -dpool dcr.suprnova.cc:2252  -dwal DskqH7NwywxaaYENnQt6kBz28aBzKUUdFjb.PC -dpsw x -allpools 1 -r 1 -dcri 30


command ok ?


DCR share rejected ................ Huh

Did anyone ever reply to you?

On Suprnova you use a username to login to suprnova across all their pools. You need to register on suprnova to get that username.  Once you have that username you use it instead of your wallet address. Your wallet address is kept inside suprnova under your account settings.

so your command line would look something like:

Code:

EthDcrMiner64.exe -epool eth-eu1.nanopool.org:9999 -ewal 0x242a8722fE288FCA7eF03b627D0C78799166C695/PC/bgs.mathieu59@gmail.com -dpool stratum+tcp://dcr.suprnova.cc:2252  -dwal username.workername -dpsw x -allpools 1 -r 1 -dcri 30 -dcoin dcr

As stated I don't think you have to use the -dcoin but it's good practice to use anyway.

After you register on suprnova click on "My Account" in the left hand navigation. Then click on "Edit Account". That's where you'll be able to add your wallet address and configure how often you want payouts.

I know nobody replied to me and I would love to know this one thing if you could please answer me.

Is a share a block found in Claymore? How do you tell the difference between a share and a block if not?

I'm solo mining picking up shares so i'm just wondering if I actually mined any blocks or not.

Answer would be greatly appreciated

[molitar]

I am hanging at startup right after dag creation has finished. It stalls until I press 's' or enter to get it to continue.

Code:

16:06:46:726	20a8	args: -gser 1 -asm 1,1,1,0,1,1,1 -epool coinotron.com:3344 -ewal molitar.miner2 -epsw pass -esm 2 -allpools 1 -dpool stratum+tcp://decred.mine.zpool.ca:5744 -dwal DsTCsvgwxveiMEYBEBK7pAAojtekY8oE5af -dcoin dcr -dcri 30,30,30,0,30,30,30 -ethi 16,16,16,2,16,16,16 
16:06:46:726	20a8	
16:06:46:727	20a8	ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
16:06:46:727	20a8	º      Claymore's Dual ETH + DCR/SC/LBC/PASC GPU Miner v9.0      º
16:06:46:727	20a8	ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
16:06:46:727	20a8	
16:06:46:928	20a8	ETH: 1 pool is specified
16:06:46:928	20a8	Main Ethereum pool is coinotron.com:3344
16:06:46:929	20a8	DCR: 2 pools are specified
16:06:46:929	20a8	Main Decred pool is decred.mine.zpool.ca:5744
16:07:00:291	20a8	OpenCL platform: AMD Accelerated Parallel Processing
16:07:03:952	20a8	OpenCL initializing...

16:07:03:952	20a8	AMD Cards available: 7 
16:07:03:953	20a8	GPU #0: Ellesmere, 8192 MB available, 36 compute units
16:07:03:953	20a8	GPU #0 recognized as Radeon RX 480
16:07:03:953	20a8	GPU #1: Ellesmere, 8192 MB available, 36 compute units
16:07:03:953	20a8	GPU #1 recognized as Radeon RX 480
16:07:03:954	20a8	GPU #2: Ellesmere, 8192 MB available, 36 compute units
16:07:03:954	20a8	GPU #2 recognized as Radeon RX 480
16:07:03:954	20a8	GPU #3: Tonga, 4096 MB available, 32 compute units
16:07:03:954	20a8	GPU #4: Ellesmere, 8192 MB available, 36 compute units
16:07:03:954	20a8	GPU #4 recognized as Radeon RX 480
16:07:03:955	20a8	GPU #5: Ellesmere, 8192 MB available, 36 compute units
16:07:03:955	20a8	GPU #5 recognized as Radeon RX 480
16:07:03:956	20a8	GPU #6: Ellesmere, 8192 MB available, 36 compute units
16:07:03:956	20a8	GPU #6 recognized as Radeon RX 480
16:07:03:956	20a8	POOL/SOLO version
16:07:03:956	20a8	b315 
16:07:03:956	20a8	Platform: Windows
16:07:03:976	20a8	start building OpenCL program for GPU 0...
16:07:04:270	20a8	done
16:07:04:472	20a8	start building OpenCL program for GPU 1...
16:07:04:760	20a8	done
16:07:04:961	20a8	start building OpenCL program for GPU 2...
16:07:05:255	20a8	done
16:07:05:475	20a8	start building OpenCL program for GPU 3...
16:07:17:162	20a8	done
16:07:17:379	20a8	start building OpenCL program for GPU 4...
16:07:17:841	20a8	done
16:07:18:042	20a8	start building OpenCL program for GPU 5...
16:07:18:334	20a8	done
16:07:18:537	20a8	start building OpenCL program for GPU 6...
16:07:18:835	20a8	done
16:07:19:065	20a8	GPU #0: algorithm ASM
16:07:19:090	20a8	GPU #1: algorithm ASM
16:07:19:129	20a8	GPU #2: algorithm ASM
16:07:19:156	20a8	GPU #3: set -etha as 0 (ETH algo for fast cards)
16:07:19:196	20a8	GPU #4: algorithm ASM
16:07:19:225	20a8	GPU #5: algorithm ASM
16:07:19:262	20a8	GPU #6: algorithm ASM
16:07:19:263	20a8	cudaGetDeviceCount failed (35, CUDA driver version is insufficient for CUDA runtime version), probably no CUDA devices
16:07:19:264	20a8	No NVIDIA CUDA GPUs detected.
16:07:19:270	20a8	Total cards: 7 
16:07:19:988	20a8	No NVIDIA cards in the list, NVML library will not be used.
16:07:20:081	10b8	ETH: Stratum - connecting to 'coinotron.com' <178.217.186.125> port 3344
16:07:20:099	20a8	DUAL MINING MODE ENABLED: ETHEREUM+DECRED

16:07:20:105	20a8	ETH: miner-proxy stratum mode
16:07:20:117	20a8	"-allpools" option is set, default pools can be used for devfee, check "Readme" file for details.
16:07:20:140	20a8	Watchdog enabled
16:07:20:140	20a8	Remote management (READ-ONLY MODE) is enabled on port 3333
16:07:20:143	20a8	

16:07:20:159	1fec	 DCR: Stratum - connecting to 'decred.mine.zpool.ca' <149.56.122.79> port 5744
16:07:20:217	1fec	send: {"id": 1, "method": "mining.subscribe", "params": ["dual 1.0"]}

16:07:20:217	1fec	send: {"id": 5, "method": "mining.extranonce.subscribe", "params": []}

16:07:20:217	1fec	send: {"id": 2, "method": "mining.authorize", "params": ["DsTCsvgwxveiMEYBEBK7pAAojtekY8oE5af",""]}

16:07:20:229	1fec	 DCR: Stratum - Connected (decred.mine.zpool.ca:5744)
16:07:20:248	10b8	send: {"id": 1, "method": "mining.subscribe", "params": []}

16:07:20:249	10b8	send: {"id": 2, "method": "mining.authorize", "params": ["molitar.miner2","pass"]}

16:07:20:252	10b8	ETH: Stratum - Connected (coinotron.com:3344)
16:07:20:283	1fec	got 148 bytes
16:07:20:283	1fec	buf: {"id":1,"result":[[["mining.set_difficulty","1"],["mining.notify","2321c6834201c43d0316ad2b5e7384c7"]],"0000000000000000810014fe",12],"error":null}

16:07:20:283	1fec	parse packet: 147
16:07:20:283	1fec	new buf size: 0
16:07:20:336	1fec	got 36 bytes
16:07:20:336	1fec	buf: {"id":5,"result":true,"error":null}

16:07:20:336	1fec	parse packet: 35
16:07:20:336	1fec	new buf size: 0
16:07:20:415	10b8	got 107 bytes
16:07:20:415	10b8	buf: {"error": null, "id": 1, "result": [["mining.notify", "ac64f797fe3c4b718a714994590613e3"], "08006C1E", 4]}

16:07:20:415	10b8	parse packet: 98
16:07:20:415	10b8	new buf size: 0
16:07:20:454	1fec	got 486 bytes
16:07:20:454	1fec	buf: {"id":2,"result":true,"error":null}
{"id":null,"method":"mining.set_difficulty","params":[1]}
{"id":null,"method":"mining.notify","params":["6e1","3f30d22fd4fd74c4d6b2ef170e681d5924ef8107ca835427000000ac00000000","35f0ae07edf9ff7a8893e0e9262ea326739283eb5f9b98684080c98d1d0dd0e2c2364a4f2d7242d335ca78b8d5096b719a7b9196b043ca5129689abc541675c90100ce4972d5195e05001400e2a60000f314031adf8676c50000000028e101009b8701007ea2ea580000000000000000","",[],"03000000","1a0314f3","58eaa27e",true]}

16:07:20:455	1fec	parse packet: 35
16:07:20:455	1fec	 DCR: Authorized
16:07:20:458	1fec	remove first packet 450
16:07:20:459	1fec	new buf size: 450
16:07:20:459	1fec	parse packet: 57
16:07:20:459	1fec	remove first packet 392
16:07:20:459	1fec	new buf size: 392
16:07:20:460	1fec	parse packet: 391
16:07:20:460	1fec	new buf size: 0
16:07:20:576	10b8	got 342 bytes
16:07:20:576	10b8	buf: { "id": null, "method": "mining.set_difficulty", "params": [65536]}
{"params": ["3752", "0xabc9ac2544ffa7047c49b90c588098cf6a89ceaeb936f2ff2e4c8133aa0a3590","0xeebc51206ea426d6c4b330286c1b5005a2e4d2a6dcc72870853114fab5177e63","0x0000000100000000000000000000000000000000000000000000000000000000", true], "id": null, "method": "mining.notify"}

16:07:20:577	10b8	parse packet: 61
16:07:20:577	10b8	remove first packet 267
16:07:20:577	10b8	new buf size: 267
16:07:20:577	10b8	parse packet: 266
16:07:20:577	10b8	ETH: job changed
16:07:20:577	10b8	new buf size: 0
16:07:20:675	10d4	Setting DAG epoch #116...
16:07:20:949	10b8	got 101 bytes
16:07:20:949	10b8	buf: {"error": null, "id": 2, "result": true}
{ "id": 9876, "method": "client.get_version", "params": []}

16:07:20:949	10b8	parse packet: 35
16:07:20:952	10b8	ETH: Authorized
16:07:20:954	10b8	remove first packet 54
16:07:20:955	10b8	new buf size: 54
16:07:20:955	10b8	parse packet: 53
16:07:20:955	10b8	send: {"error": null, "id": 9876, "result": "eth 1.0"}

16:07:20:955	10b8	new buf size: 0
16:07:22:710	13dc	recv: 51
16:07:22:710	13dc	srv pck: 50
16:07:23:116	13dc	srv bs: 0
16:07:23:116	13dc	sent: 204
16:07:23:343	10d4	Setting DAG epoch #116 for GPU #3
16:07:23:344	10d4	Create GPU buffer for GPU #3
16:07:23:382	f00	Setting DAG epoch #116 for GPU #4
16:07:23:383	f00	Create GPU buffer for GPU #4
16:07:23:543	148c	Setting DAG epoch #116 for GPU #2
16:07:23:544	148c	Create GPU buffer for GPU #2
16:07:23:605	10b8	got 274 bytes
16:07:23:605	10b8	buf: {"params": ["3753", "0x67a38a3f99268eae41512f7714b2df31fbceb5778d7f5c2700510cd875290cc5","0xeebc51206ea426d6c4b330286c1b5005a2e4d2a6dcc72870853114fab5177e63","0x0000000100000000000000000000000000000000000000000000000000000000", true], "id": null, "method": "mining.notify"}

16:07:23:605	10b8	parse packet: 266
16:07:23:605	10b8	ETH: job changed
16:07:23:605	10b8	new buf size: 0
16:07:23:611	10b8	ETH: 04/09/17-16:07:23 - New job from coinotron.com:3344
16:07:23:611	10b8	target: 0x0000000100000000 (diff: 4294MH), epoch #116
16:07:23:615	10b8	ETH - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0, Time: 00:00
16:07:23:617	10b8	ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s, GPU2 0.000 Mh/s, GPU3 0.000 Mh/s, GPU4 0.000 Mh/s, GPU5 0.000 Mh/s, GPU6 0.000 Mh/s
16:07:23:618	10b8	 DCR - Total Speed: 0.000 Mh/s, Total Shares: 0, Rejected: 0
16:07:23:619	10b8	 DCR: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s, GPU2 0.000 Mh/s, GPU3 0.000 Mh/s, GPU4 0.000 Mh/s, GPU5 0.000 Mh/s, GPU6 0.000 Mh/s
16:07:23:695	15ec	recv: 51
16:07:23:696	15ec	srv pck: 50
16:07:23:757	17a8	Setting DAG epoch #116 for GPU #1
16:07:23:758	17a8	Create GPU buffer for GPU #1
16:07:23:926	2304	Setting DAG epoch #116 for GPU #0
16:07:23:927	2304	Create GPU buffer for GPU #0
16:07:24:020	1010	Setting DAG epoch #116 for GPU #5
16:07:24:087	1010	Create GPU buffer for GPU #5
16:07:24:177	2380	Setting DAG epoch #116 for GPU #6
16:07:24:178	2380	Create GPU buffer for GPU #6
16:07:24:465	15ec	srv bs: 0
16:07:24:466	15ec	sent: 204
16:07:24:723	1d14	recv: 51
16:07:24:723	1d14	srv pck: 50
16:07:25:124	1d14	srv bs: 0
16:07:25:125	1d14	sent: 205
16:07:27:871	f00	GPU 4 DAG creation time - 4326 ms
16:07:27:883	f00	Setting DAG epoch #116 for GPU #4 done
16:07:28:086	148c	GPU 2 DAG creation time - 4330 ms
16:07:28:087	148c	Setting DAG epoch #116 for GPU #2 done
16:07:28:275	17a8	GPU 1 DAG creation time - 4347 ms
16:07:28:289	17a8	Setting DAG epoch #116 for GPU #1 done
16:07:28:366	2304	GPU 0 DAG creation time - 4343 ms
16:07:28:367	2304	Setting DAG epoch #116 for GPU #0 done
16:07:28:509	1010	GPU 5 DAG creation time - 4331 ms
16:07:28:516	1010	Setting DAG epoch #116 for GPU #5 done
16:07:28:616	2380	GPU 6 DAG creation time - 4330 ms
16:07:28:618	2380	Setting DAG epoch #116 for GPU #6 done
16:07:29:650	10d4	GPU 3 DAG creation time - 6269 ms
16:07:29:652	10d4	Setting DAG epoch #116 for GPU #3 done
16:07:29:719	b54	recv: 51
16:07:29:719	b54	srv pck: 50
16:07:30:021	b54	srv bs: 0
16:07:30:021	b54	sent: 278
16:07:32:630	1010	DCR: put share nonce 3ca87b3 enonce 1c32007a
16:07:32:630	1010	DCR round found 1 shares

It also hung at switching over to Devfee mining.

EthDcrMiner64.exe -gser 1 -asm 1,1,1,0,1,1,1 -epool coinotron.com:3344 -ewal molitar.miner2 -epsw <pass> -esm 2 -allpools 1 -dpool stratum+tcp://decred.mine.zpool.ca:5744 -dwal <address> -dcoin dcr -dcri 30,30,30,0,30,30,30 -ethi 16,16,16,2,16,16,16

GPU 0-2 RX 480 8GB
GPU 3 R9 380x 3GB
GPU 4-6 RX 480 8GB

So any suggestions?

[Ambros]

You are forcing max load limits on your PSU. Consider adding a second PSU.

You want to undervolt to lower the energy consumption. Somewhere between 900mv to 950mv should work well. maybe even 880mv if you're lucky. Make sure you reduce both core and mem voltage to same value too

so after little bit tuning today, I got this


and from wall




GPU2 was hanging on these setup so I only set that card to 950mv , it's stable now (will test overnight)

-dcri 30, if I set it to 35 I get 10mh/s less on ETH and only 300 mhs more on DCR - not worth it and 30W more power consumption

In the end
power consumption lowered by 7% and mhs and power are much more stable now

Can I ask about those cards ASIC quality?
Those numbers are pretty amazing, almost 20% less power usage than me

[miner582]

Claymore can't connect to Nanopool with -esm 1. How did you do that? What is yout .bat settings?

I am running claymore under linux, these are the flags:

-colors 0 -dbg -1 -epool eth-us-east1.nanopool.org:9999 -ewal wallet/xx1/xxx@xxx.com -epsw x -eworker xx1 -mode 0 -dpool stratum+tcp://dcr-us.coinmine.pl:2222 -dwal xx.xx
-dpsw x -gser 2 -allcoins 1 -wd 0 -esm 0 -allpools 1 -asm 0 -ethi 16 -dcri 34 -di 012345

[miner582]

Anyone had lucky with rx480 and asm 1? I had not been able to configure stable with asm 1. Currently working stable for 3 days at very good speed but on asm 0. Any advice will be appreciatte. I am working on linux.

[AzzAz]

Hello
I know nobody replied to me and I would love to know this one thing if you could please answer me.

Is a share a block found in Claymore? How do you tell the difference between a share and a block if not?

I'm solo mining picking up shares so i'm just wondering if I actually mined any blocks or not.

Answer would be greatly appreciated

share is-SHARE. Pool is finding blocks and calculating your part, using shares.
If you getting shares - you are mining on the pool. So try to find @ pool stats who gets block(s).
If you mine solo - you will find block ( in this life ) if you have 1000+ cards. Maybe.
Try wiki ( mining, pools, shares, blocks )...

[TechPark]

Hello
I know nobody replied to me and I would love to know this one thing if you could please answer me.

Is a share a block found in Claymore? How do you tell the difference between a share and a block if not?

I'm solo mining picking up shares so i'm just wondering if I actually mined any blocks or not.

Answer would be greatly appreciated

share is-SHARE. Pool is finding blocks and calculating your part, using shares.
If you getting shares - you are mining on the pool. So try to find @ pool stats who gets block(s).
If you mine solo - you will find block ( in this life ) if you have 1000+ cards. Maybe.
Try wiki ( mining, pools, shares, blocks )...

This is not accurate. With 30 cards you can find ETH block mining solo in 5 days.

[koody]

My results with R9 280x:
Before using version 8.1
Eth 14.5 / DCR 450

Now using version v9.0
Eth 14.7 / DCR 1100

[Cubirez]

Hello
I know nobody replied to me and I would love to know this one thing if you could please answer me.

Is a share a block found in Claymore? How do you tell the difference between a share and a block if not?

I'm solo mining picking up shares so i'm just wondering if I actually mined any blocks or not.

Answer would be greatly appreciated

share is-SHARE. Pool is finding blocks and calculating your part, using shares.
If you getting shares - you are mining on the pool. So try to find @ pool stats who gets block(s).
If you mine solo - you will find block ( in this life ) if you have 1000+ cards. Maybe.
Try wiki ( mining, pools, shares, blocks )...

This is not accurate. With 30 cards you can find ETH block mining solo in 5 days.

A share is a "tool" used by the pools to measure the contribution of the miners to the block solving effort.

I will use some extracts of the bitcoin wiki to help to explain.

First you need to understand the "difficulty" concept of POW blockchains :
Extract from : https://en.bitcoin.it/wiki/Mining
Mining a block is difficult because the SHA-256 hash of a block's header must be lower than or equal to the target in order for the block to be accepted by the network. This problem can be simplified for explanation purposes: The hash of a block must start with a certain number of zeros. The probability of calculating a hash that starts with many zeros is very low, therefore many attempts must be made. In order to generate a new hash each round, a nonce is incremented.

As mentionned above, finding a block (ie finding a hash > target difficulty) is quite complicated and can take days for a solo miner.
Therefore, the pool sets a sub-difficulty setting for the shares :
It will count submitted solutions with a difficulty that is lower than the blockchain's actual difficulty. The miners will submit every valid share to the pool.
Then once a block is found by someone on the pool (ie when a share that meets the target difficulty of the blockchain is found), the block reward will be distributed among the miners depending on how many shares they submitted during the round (in case of a Pay per Share model).


Simply put, a share is a lesser solution of the block finding. It's worth nothing but it allows the pool to retribute miners in a fair way for their effort.

You can also read this for more infos :
https://en.bitcoin.it/wiki/Pooled_mining