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一周以前把显卡挖矿停下来了,粗算一下已经知道不能再挖:以现在的难度,一块6850每天最多能挖到0.3欧元,折合到全年100欧出头,但它本身耗电120瓦,按法国电价计算就是120欧元每年,电费成本高于比特币收入。而且不是针对这一款显卡,因为全部HD6000系列的挖矿效率是接近的,更高端的6870,6970甚至6990虽然有更高的挖矿速度,但相应的耗电量也大体是线性增加的,从费效比来看与6850并没有区别。

结论就是6000系列的显卡必须退出比特币挖矿。而7000系列的命运也好不到哪里去,决定显卡挖矿速度的是流处理器(SPU)数量:比如7850有1024个,仅比6850的960个多出区区6%,这个数字与两者实际挖矿速度的差异是很接近的,而7000系列28纳米工艺带来的最大好处是在提高GPU频率的同时压低耗电和发热,最终比较结果就是:7000系列显卡与同级6000系列相比,流处理器的数量没有明显增加(这是影响挖矿速度的主要因素),频率有很好的提升(对挖矿没啥大用处),保持了几乎同样水平的耗电和发热,总的费效比是半斤八两。这样看来至少在比特币挖矿这项应用上,7000系列并不比6000系列更有效,也就是说用7000系列挖矿也挖不上几天了。。。

显卡是微星的6850,主频800Mhz,960个处理单元。大约一个月前开始挖矿,因为懒,没做研究工作,打开cgminer就用默认配置来挖,速度一直在190Mhash/s上下。不是全时,每天开机15小时,一个月的时间挖了不到0.2个比特币,按现在市价折合18欧元不到。

前两天突然想起机器上有另一块显卡,一直没用起来。于是赶紧动手,解决浪费问题。

这块没用起来的显卡就是apu 3870k里集成的6550d!bios里启用集显和多显示器支持,显示器都接到主板集显出口,把6850超频变成全职挖矿卡。设置cgminer启动参数:

ipv6是个听上去很牛,实际上却没啥用的玩意,每次装完系统都要把它禁掉。Ubuntu下面禁用ipv6很简单,在/etc/sysctl.conf里加上几行:

#Disable IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

启用新的配置:

sudo sysctl -p

Apparently, it's not installed by default with jdk. In fact, there is a link to the zip but the file itself isn't downloaded. So, simple solution:

sudo apt-get install openjdk-6-source

 

I wrote a utility script to do some automatic moving and copying stuff, put it in a directory, exported the dir in $PATH with bashrc and it worked well with my normal user. But when I tried to sudo the script, it couldn't be found. Copy bashrc for root didn't work better. Finally google helped me out: it's the secure_path stuff on my way.

In fact, when we sudo a command, the system makes a env_reset first. So all our settings in bashrc are lost, including customized $PATH. So the solution is to modify /etc/sudoers, either we completely disable the secure_path reset:

git config --gloabal color.branch auto
git config --gloabal color.diff auto
git config --gloabal color.interactive auto
git config --gloabal color.status auto

 To enable all at once:

git config --gloabal color.ui true

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