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How do cache lines work?
...(DDR1/2/3/4 SDRAM burst transfer size is configurable up to 64B; CPUs will select the burst transfer size to match their cache line size, but 64B is common)
As a rule of thumb, if the processor can't forecast a memory access (and prefetch it), the retrieval process can take ~90 nanoseconds, or ~250...
In what areas might the use of F# be more appropriate than C#? [closed]
... F# (also written in F#). I actually did first experiments in C#, but then converted the code to F#.
CodeDOM provider needs to traverse some structure represented using .NET objects, so there isn't much space for inventing your own representations of data (which is the area where F# can offer nice...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
... copied from the storage engine layer to the SQL layer, VARCHAR fields are converted to CHAR to gain the advantage of working with fixed-width rows. So the strings in memory become padded out to the maximum length of your declared VARCHAR column.
When your query implicitly generates a temporary ta...
How can I parse a CSV string with JavaScript, which contains comma in data?
...adjacent whitespace (which is ignored).
Find:
A JavaScript function which converts a valid CSV string (as defined above) into an array of string values.
Solution:
The regular expressions used by this solution are complex. And (IMHO) all non-trivial regular expressions should be presented in free-sp...
Setting Corner Radius on UIImageView not working
...
In Xcode Interface Builder, selecting 'Clip Subviews' Drawing attribute for the view together with setting the corner radius in the code cell.previewImage.layer.cornerRadius = 20;does the job for me!
See 'Clip Subviews' option in IB
...
Is there a command to undo git init?
...strator--hit the windows key, type 'cmd', right click 'command prompt' and select 'run as administrator) and try the same commands.
rd is an alternative form of the rmdir command. http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/rmdir.mspx?mfr=true
...
What is the difference between active and passive FTP?
...part of this, the server also returns to the client the port number it has selected to listen on, so that the client knows how to connect to it.
Once the client knows that, it can then successfully create the data channel and continue.
More details are available in the RFC: https://www.ietf.org/rf...
Whether a variable is undefined [duplicate]
...
jQuery.val() and .text() will never return 'undefined' for an empty selection. It always returns an empty string (i.e. ""). .html() will return null if the element doesn't exist though.You need to do:
if(page_name != '')
For other variables that don't come from something like jQuery.val(...
Seeding the random number generator in Javascript
...PRNG functions produce a positive 32-bit number (0 to 232-1) which is then converted to a floating-point number between 0-1 (0 inclusive, 1 exclusive) equivalent to Math.random(), if you want random numbers of a specific range, read this article on MDN. If you only want the raw bits, simply remove t...
Sort a Map by values
...
Java 8 offers a new answer: convert the entries into a stream, and use the comparator combinators from Map.Entry:
Stream<Map.Entry<K,V>> sorted =
map.entrySet().stream()
.sorted(Map.Entry.comparingByValue());
This will let you ...