<p>You ought to test the setup on the machine you will be using. Generally the mining software should efficiently use the entire GPU, but it might happen that it will not and actually running two instances at the same time will allow you to tap into more computing power. But again, check your speed while running one or more instances and see which one gives you more total speed.</p>

CC BY-SA 3.0
2012-11-06T22:52:21.617Z
Thanks, what I think is the GPU usage percentage on `cgminer` might not actually be the GPU usage anyway. Unfortunately, there is no reliable way to check the GPU usage in Linux distros, so I guess I'll just mine with one worker for now.
Marco Scannadinari
CC BY-SA 3.0
2012-11-06T09:52:52.597Z
2012-11-06T09:52:52.597Z
ThePiachu
<p>I run 2 instances of cgminers because I have two cards one which performs better for SHA256 and the other performs better for the SCRYPT algorithm.</p>

<p>Effectively increased my hash rate by 10 percent doing this.</p>

<p>The only problem is when you use --auto-fan and (presumably) --auto-gpu</p>

<p>The nuisance is that cgminer version 2.4.1 is trying to control the fans of the GPU card that is turned OFF which causes unwanted rapid oscillations in fan speed as 2 cgminers are trying to control the fan of a single card.</p>

<p>To solve that, you need to go in G(PU)/C(hange)/#/A(uto)/F(an) where # is the number of the GPU card that is set to OFF in a specific instance of the cgminer.</p>

<p>This will prevent cgminer from accessing the fans of the card that is turned off.</p>

CC BY-SA 3.0
2013-05-25T13:11:11.083Z
2013-05-25T13:11:11.083Z
Sherry
<p>I use cgminer on Ubuntu 12.10 to mine bitcoins in the 50BTC pool. I have three workers set up. If I run multiple instances of cgminer, each targeted at their respective workers (1, 2, and 3), would this increase profits or just waste power?</p>
<p>I notice this because cgminer only uses about 80-90% of my GPU (Radeon HD 6570) anyway.</p>

<cgminer><miner-configuration><gpu-mining>
Better or worse to mine multiple workers on one machine?
Marco Scannadinari
# Better or worse to mine multiple workers on one machine?

(Asked by: username_0 on 2012-11-05)

I use cgminer on Ubuntu 12.10 to mine bitcoins in the 50BTC pool. I have three workers set up. If I run multiple instances of cgminer, each targeted at their respective workers (1, 2, and 3), would this increase profits or just waste power?

I notice this because cgminer only uses about 80-90% of my GPU (Radeon HD 6570) anyway.

**Tags:** cgminer, miner-configuration, gpu-mining


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## 2 answers

### Answer by username_1 on 2012-11-06. Score: 1 | Accepted answer

You ought to test the setup on the machine you will be using. Generally the mining software should efficiently use the entire GPU, but it might happen that it will not and actually running two instances at the same time will allow you to tap into more computing power. But again, check your speed while running one or more instances and see which one gives you more total speed.

> **Comments:**
> **username_0**: Thanks, what I think is the GPU usage percentage on `cgminer` might not actually be the GPU usage anyway. Unfortunately, there is no reliable way to check the GPU usage in Linux distros, so I guess I'll just mine with one worker for now.  

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### Answer by username_2 on 2013-05-25. Score: 1

I run 2 instances of cgminers because I have two cards one which performs better for SHA256 and the other performs better for the SCRYPT algorithm.

Effectively increased my hash rate by 10 percent doing this.

The only problem is when you use --auto-fan and (presumably) --auto-gpu

The nuisance is that cgminer version 2.4.1 is trying to control the fans of the GPU card that is turned OFF which causes unwanted rapid oscillations in fan speed as 2 cgminers are trying to control the fan of a single card.

To solve that, you need to go in G(PU)/C(hange)/#/A(uto)/F(an) where # is the number of the GPU card that is set to OFF in a specific instance of the cgminer.

This will prevent cgminer from accessing the fans of the card that is turned off.


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