- 分类:比特币
- 点击数:1790
m88体育 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。
m88体育结论就是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。。。
- 分类:Linux Admin
- 点击数:1520
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
- 分类:Linux Admin
- 点击数:1404
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
- 分类:Linux Admin
- 点击数:1315
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:
- 分类:Git
- 点击数:1367
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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