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When should I use mmap for file access?
...wkwardness with mmap as a replacement for read / write is that you have to start your mapping on offsets of the page size. If you just want to get some data at offset X you will need to fixup that offset so it's compatible with mmap.
And finally, read / write are the only way you can work with som...
Concurrent HashSet in .NET Framework?
...g outside the class then why don't you use a simple HashSet right from the start?
– George Mavritsakis
Apr 11 '16 at 9:36
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show 21 more com...
MySQL vs MongoDB 1000 reads
...e this as a single document, in a single collection. This is where MongoDB starts enabling superior performance.
In MongoDB, to retrieve the whole entity, you have to perform:
One index lookup on the collection (assuming the entity is fetched by id)
Retrieve the contents of one database page (the...
What is the standard naming convention for html/css ids and classes?
...
Update 2019 (you asked for it)
After writing no CSS for quite a while, I started working at a place that uses OOCSS in one of their products. I personally find it pretty unpleasant to litter classes everywhere, but not having to jump between HTML and CSS all the time feels quite productive.
I'm s...
Xcode 4.5 Storyboard 'Exit'
...ard in your App" (it's fifth from the top) The discussion of unwind segues starts at time 37:20.
Update:
Here is some more info on the subject from Apple's documentation
A placeholder object named Exit for unwinding seques. By default, when
a user dismisses a child scene, the view controlle...
How do you keep user.config settings across different assembly versions in .net?
...true. Name it UpgradeRequired or something similar.
Then, at application start you check to see if the flag is set and if it is, call the Upgrade method, set the flag to false and save your configuration.
if (Settings.Default.UpgradeRequired)
{
Settings.Default.Upgrade();
Settings.Default...
What is unit testing? [closed]
... the long run.
If you're not doing unit testing now, I recommend you get started on it. Get a good book, practically any xUnit-book will do because the concepts are very much transferable between them.
Sometimes writing unit tests can be painful. When it gets that way, try to find someone to hel...
Array.Copy vs Buffer.BlockCopy
...
const int times = 20;
for (int i = 0; i < times; ++i)
{
stopwatch.Start();
Buffer.BlockCopy(buffer, 0, copy, 0, length);
stopwatch.Stop();
blockCopyTotal += stopwatch.Elapsed;
stopwatch.Reset();
stopwatch.Start();
Array.Copy(buffer, 0, copy, 0, length);
stopwa...
How do I get both STDOUT and STDERR to go to the terminal and a log file?
...ript" that will capture everything that goes to the screen to a file. You start it by typing "script", then doing whatever it is you want to capture, then hit control-D to close the script file. I don't know of an equivalent for sh/bash/ksh.
Also, since you have indicated that these are your own ...
ctypes - Beginner
...om output. Like this:
>>> 4+5
9
Here we see that the line that starts with >>> is the Python code, and 9 is what it results in. This is exactly how it looks if you start a Python interpreter, which is why it's done like that.
You never enter the >>> part into a .py fil...