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Count number of lines in a git repository
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I've encountered batching problems with git ls-files | xargs wc -l when dealing with large numbers of files, where the line counts will get chunked out into multiple total lines.
Taking a tip from question Why does the wc utility generate mu...
What is difference between monolithic and micro kernel?
...s to implement inter-process communication (IPC), microkernels use message queues. 1st gen microkernels didn't implement IPC well and were slow on context switches - that's what caused their poor performance.
Adding a new feature to a monolithic system means recompiling the whole kernel or the corre...
Checking if a list is empty with LINQ
...is is implemented even by some non-obsolete generic classes as well (i.e., Queue<T> and Stack<T>). I would also use as instead of is as it's more idiomatic and has been shown to be faster.
public static bool IsEmpty<T>(this IEnumerable<T> list)
{
if (list == null)
{
...
快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...益如何。按照估算，20万的实盘账户，每月稳定有净利润5000元以上（即，年收益大约30%以上，权益回撤不超过10%），同时，产生的手续费比净利润略低些，大约是净利润的9成左右（目前，我的手续费是交易所+3毛）。
这话是不...
SVN repository backup strategies
...nning to automate it in windows using task scheduler look at the following batch file: cfchimp.com/wordpress/2008/05/…
– Ryan Sampson
Jun 7 '11 at 17:42
1
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Faster s3 bucket duplication
...)
- update ~/.aws/config with:
-- max_concurrent_requests = 128
-- max_queue_size = 8096
with following config and instance type I was able to sync bucket (309GB, 72K files, us-east-1) within 474 seconds.
For more generic solution consider -...
Play audio from a stream using C#
...llows you to "read ahead" and dump smaller chunks of audio into the output queue - Windows will automatically play the chunks seamlessly. Your code would have to take the compressed audio stream and convert it to small chunks of WAV audio on the fly; this part would be really difficult - all the li...
The type or namespace name does not exist in the namespace 'System.Web.Mvc'
...d it from Nuget and now they both work again. This happened after a recent batch of windows updates that included .net framework updates for the version I was using (4.5.1).
Edit: From the .Net Web Development and Tools Blog:
Microsoft Asp.Net MVC Security Update MS14-059 broke my build!
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scp or sftp copy multiple files with single command
...to add that using \{a,b,c\} will transfer the files in a single connection/batch (since they'll be expanded on the remote host), while using {a,b,c} will open multiple connections, and the overhead is quite noticeable when transferring many files
– omninonsense
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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...ng Wouter's method)
In [6]: df = pd.DataFrame(randint(0,10,10000).reshape(5000,2),columns=list('AB'))
In [7]: %timeit dict(zip(df.A,df.B))
1000 loops, best of 3: 1.27 ms per loop
In [8]: %timeit pd.Series(df.A.values,index=df.B).to_dict()
1000 loops, best of 3: 987 us per loop
...