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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)
{
...
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
...
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
...
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 -...
log4j logging hierarchy order
...tatic int OFF_INT = Integer.MAX_VALUE;
public final static int FATAL_INT = 50000;
public final static int ERROR_INT = 40000;
public final static int WARN_INT = 30000;
public final static int INFO_INT = 20000;
public final static int DEBUG_INT = 10000;
public static final int TRACE_INT = 5000;
pub...
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...
Error handling principles for Node.js + Express.js applications?
...ely crash if connection fails
var socket = require("net").createConnection(5000);
socket.on("error", function(err) {
console.error("calm down...", err)
});
This can-but-shouldn't be taken to the extreme to catch all errors and make an application which will try very hard to never crash. This i...
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!
...
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
...