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Realistic usage of the C99 'restrict' keyword?
...aliasing, enabling better optimization by the compiler.
For instance, suppose I have a machine with specialized instructions that can multiply vectors of numbers in memory, and I have the following code:
void MultiplyArrays(int* dest, int* src1, int* src2, int n)
{
for(int i = 0; i < n; i++...
The difference between fork(), vfork(), exec() and clone()
... it true that fork() calls clone() internally?
– gronostaj
Apr 5 '14 at 14:32
24
vfork avoids the...
C# vs C - Big performance difference
...seems that what you're measuring is basically "which compiler inserts the most debugging overhead". And turns out the answer is C. But that doesn't tell us which program is fastest. Because when you want speed, you enable optimizations.
By the way, you'll save yourself a lot of headaches in the lon...
In-memory size of a Python structure
...int 14
list 32
object 8
set 112
str 26
tuple 24
unicode 26
2016-08-01
OSX, Python 2.7.10 (default, Oct 23 2015, 19:19:21) [GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin
decimal 80
dict 280
float 24
int 24
list 72
object 16
set 232
str 38
tuple 56
unicode 52
...
QuotaExceededError: Dom exception 22: An attempt was made to add something to storage that exceeded
Using LocalStorage on iPhone with iOS 7 throws this error. I've been looking around for a resolvant, but considering I'm not even browsing in private, nothing is relevant.
...
Multithreading: What is the point of more threads than cores?
...
The answer revolves around the purpose of threads, which is parallelism: to run several separate lines of execution at once. In an 'ideal' system, you would have one thread executing per core: no interruption. In reality this isn't the case. Even if you hav...
I forgot the password I entered during postgres installation
...or mistyped (during the installation) the password to the default user of Postgres. I can't seem to be able to run it and I get the following error:
...
Is there a shortcut to make a block comment in Xcode?
...( // ) comment. I'm using Xcode. In Sublime Text and Eclipse, and I think most other IDEs, there are separate keyboard shortcuts for line comments and block comments ( /**/ ). However, I don't see that in Xcode - in fact, I don't even see a menu option to add a block comment. Is it simply not suppor...
PostgreSQL: How to make “case-insensitive” query
Is there any way to write case-insensitive queries in PostgreSQL, E.g. I want that following 3 queries return same result.
...
Throwing exceptions from constructors
...
In most situations. Don;t forget things like std::fstream. On failure it still creates an object, but because we are always testing the state of the object normally it works well. So an object that has a natural state that is tes...