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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...r cache thrashing, if I can coin a term.
Caches work by indexing with low order bits and tagging with high order bits.
Imaging that your cache has 4 words and your matrix is 4 x 4. When a column is accessed and the row is any power of two in length, then each column element in memory will map to t...
How do I add the contents of an iterable to a set?
...rt Timer
a = set(range(1, 100000))
b = list(range(50000, 150000))
def one_by_one(s, l):
for i in l:
s.add(i)
def cast_to_list_and_back(s, l):
s = set(list(s) + l)
def update_set(s,l):
s.update(l)
results are:
one_by_one 10.184448844986036
cast_to_list_and_back 7.96925...
Difference Between One-to-Many, Many-to-One and Many-to-Many?
...ate is the one side and City is the many side. There will be a column state_id in the table cities.
In unidirectional, Person class will have List<Skill> skills but
Skill will not have Person person. In bidirectional, both
properties are added and it allows you to access a Person given a
ski...
How to find if a native DLL file is compiled as x64 or x86?
...
The Magic field of the IMAGE_OPTIONAL_HEADER (though there is nothing optional about the header in Windows executable images (DLL/EXE files)) will tell you the architecture of the PE.
Here's an example of grabbing the architecture from a file.
public ...
Declaring abstract method in TypeScript
...defines concrete methods & properties.
*/
class Animal {
private _impl : IAnimal;
public name : string;
/**
* Here comes the clever part: by letting the constructor take an
* implementation of IAnimal as argument Animal cannot be instantiated
* without a valid imp...
How do I have an enum bound combobox with custom string formatting for enum values?
...ethod:
public struct Described<T> where T : struct {
private T _value;
public Described(T value) {
_value = value;
}
public override string ToString() {
string text = _value.ToString();
object[] attr =
typeof(T).GetField(text)
...
Ruby on Rails Callback, what is difference between :before_save and :before_create?
..., there are six callbacks before the database operation, and two after. In order, these are:
before_validation
before_validation_on_create
after_validation
after_validation_on_create
before_save
before_create
DATABASE INSERT
after_create
after_save
Update operations have exactly the same set, ex...
Sending and Receiving SMS and MMS in Android (pre Kit Kat Android 4.4)
...he jars already in the libs directory, then on the build path config click order and export and check the boxes of the jars and move jsoup and droidprism jar to the top of the build order.
– Sam Adamsh
Jul 27 '13 at 17:44
...
How can I check if an ip is in a network in Python?
...otted quad string to long integer"
return struct.unpack('L',socket.inet_aton(ip))[0]
def networkMask(ip,bits):
"Convert a network address to a long integer"
return dottedQuadToNum(ip) & makeMask(bits)
def addressInNetwork(ip,net):
"Is an address in a network"
return ip &...
How to handle command-line arguments in PowerShell
...that is not a bug! Powershell will process and assign the arguments in the order they're given, unless overridden by using the proper parameter name, e.g., if your param block lists: $user $pass $server, and you execute yourscript.ps1 a b c, a will be set into $user, b into $pass and c into $server,...