Difference between revisions of "Litecoin Mining for Funtoo"

Revision as of 06:48, 23 October 2012

Litecoin mining is a fun and easy way that you can help support the Funtoo Linux project. Litecoin is a virtual cryptographic currency that is generated using CPUs and video card GPU computational power, and can be converted into a traditional currency like US dollars. Typically, it is mined by pools of computers, and Funtoo is part of the ozco.in pool.

Here's how to get started and convert your idle CPU power into a contribution to the Funtoo Linux project.

CPU Mining

The "miner" is the program that performs the computation to generate litecoins. It receives blocks from a server, which it performs computations on. Miners are designed to run continually in the background, where they use up idle CPU only, and will not impact the speed of your system. A significant contribution to Funtoo Linux is only realized when miners are run continually for days and weeks -- so running a miner for an hour or so is typically not effective.

Installation using Portage

This method will use CFLAGS from /etc/portage/make.conf. Note that -O2 seems to work much better than -O3.

# emerge pooler-cpuminer

Set up go.sh

Create the following go.sh script to start the miner:

#!/bin/bash
threads=$(grep -c "^processor" /proc/cpuinfo)
while true;
do
  minerd --algo scrypt -s 45 --retry-pause 5 --threads $threads --url http://lc.ozco.in:9332 --userpass funtoo.public:p
done

Make it executable:

# chmod +x go.sh

Run go.sh

Run go.sh to start the miner.

# ./go.sh

The cpuminer will only use idle CPU and will not slow down your system. Modern systems will generate somewhere from 15 to 60 KHash/sec total, which will result in $10 to Funtoo Linux per month for a Core i7 system at current exchange rates, when run continually.

Keep those miners running and thanks for supporting Funtoo Linux!

GPU Mining

It is also possible to mine litecoins using a modern video card. AMD (ATI) cards tend to work much better than NVIDIA for litecoin mining. Here's how to do GPU mining:

Install cgminer

# emerge cgminer

Create cgminer script

Create a go.sh script that looks like this:

#!/bin/bash
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1
export DISPLAY=:0
cgminer \
-o http://lc.ozco.in:9332/ -u funtoo.public -p p \
-o http://bdfl.funtoo.org:9327/ -u funtoo.public -p p \
--intensity 17 \
--scrypt \
--shaders 1536 --thread-concurrency 8000 -g 1 --worksize 256 \
--auto-fan --temp-target 80 --gpu-powertune 10

This script will start cgminer to connect to lc.ozco.in, but will automatically fall back to the funtoo.org p2pool if ozco.in is down. Intensity ranges from 1-20, with higher settings generally offering better hashrates. But if you get too close to 20, you will notice a slow down in interactive performance when using the X server. ssh performance will be unaffected.

Be sure to properly set the number of shaders on your card -- 1536 is for an unlocked Radeon HD 6950. Consult SCRYPT-README (look for the --shaders description) to view the correct shaders to use for your card.

Start Mining

Now make it executable and start mining:

# chmod +x go.sh
# ./go.sh