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Linux 网卡速率（百兆/千兆）的查看及调整 - 操作系统(内核) - 清泛网 - 专...
...兆or千兆等）
ip -d link #查看网卡工作状态：UP -启用；DOWN -未启用
ethtool -s {ethXXX} [speed 10|100|1000] #设置网卡速率为10M/100M/1000M
注：上述命令仅限于物理机查看，虚拟机无效，虚拟机需要在宿主机上进行设置。
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linux eth...
App Inventor 2 如何下载/保存网络图片？ - App Inventor 2 中文网 - 清泛...
App Inventor 2 如何下载/保存网络图片？ai2_down_webpics首先，需要使用Web客户端组件，需要和网络url进行数据交互的场景就要考虑使用它，Web客户端组件在通信连接抽屉中：设置好网络图片的url，然后执行Get方法即可，代码如下：其...
Why would I prefer using vector to deque
...ge instances of vector may lead to unnecessary heap fragmentation (slowing down calls to new).
Also, as pointed out elsewhere on StackOverflow, there is more good discussion here: http://www.gotw.ca/gotw/054.htm .
share
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Why is the use of alloca() not considered good practice?
...same fear of local arrays or recursion (in fact many people who will shout down alloca() will praise recursion because it "looks elegant"). I agree with Shaun's advice ("alloca() is fine for small allocations") but I disagree with the mindset that frames alloca() as uniquely evil among the 3 -- the...
Getting “Warning! PATH is not properly set up” when doing rvm use 2.0.0 --default
...tories to $PATH, then those changes will push the directories added by rvm down from their first position. RVM, when invoked, will find that its ruby binary directories are not at the very beginning of $PATH and BAM! you'll get the warning :) .
I hope that makes things clear.
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Cropping an UIImage
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Not sure why it was down voted, I thought it was a good answer. The only thing I can think of is that it doesn't handle scaling so it will not work if you have @2x/@3x images and your function names don't match up.
– Willia...
Python hashable dicts
... (in practice either approach should work, though this one might be slowed down by making an unneeded itermediate list -- fixable by s/items/iteritems/ -- assuming Python 2.* as you don't say;-).
– Alex Martelli
Jul 20 '09 at 4:48
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Tips for debugging .htaccess rewrite rules
... all of the images, css and js are returning 404 errors, quickly narrowing down the problem.
While others will report that you started at URL A and ended at URL C, you will be able to see that they started at URL A, were 302 redirected to URL B and 301 redirected to URL C. Even if URL C was the ult...
Check if a given key already exists in a dictionary
...y on dicts, was 363.235070 using "key in dict.keys()" and drastically went down to 0.260186 solely by removing the call for "keys()"
– Ido_f
Jan 26 '15 at 18:15
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How big can a MySQL database get before performance starts to degrade
...ce. If we ever had to recover from a disaster using a SQL backup, we'd be down for days.
Horizontally scaling SQL is also pretty painful, and in most cases leads to using it in ways you probably did not intend when you chose to put your data in SQL in the first place. Shards, read slaves, multi-ma...